现代地质 ›› 2020, Vol. 34 ›› Issue (05): 1001-1014.DOI: 10.19657/j.geoscience.1000-8527.2019.032
农军年1,2(), 郭尚宇2, 孙明行2, 唐娟红2, 覃瑞才2, 周秋娥2
收稿日期:
2018-07-05
修回日期:
2020-04-21
出版日期:
2020-10-28
发布日期:
2020-10-29
作者简介:
农军年,男,硕士,高级工程师,1986年出生,地质学专业,主要从事区域地质矿产调查研究工作。Email: 175070721@qq.com。
基金资助:
NONG Junnian1,2(), GUO Shangyu2, SUN Minghang2, TANG Juanhong2, QIN Ruicai2, ZHOU Qiue2
Received:
2018-07-05
Revised:
2020-04-21
Online:
2020-10-28
Published:
2020-10-29
摘要:
古罗和王姜冲岩体产于扬子地块与华夏地块拼合带的西南段,对剖析华南区域构造演化过程具有重要的地质意义。古罗和王姜冲岩体主要由辉长岩及少量的闪长岩组成。LA-ICP-MS锆石U-Pb年代学分析表明,古罗和王姜冲辉长岩的侵位结晶时限分别为(163±1) Ma和(158±1) Ma,属于燕山期岩浆活动的产物。岩石无Nb、Ta负异常,具有板内钾玄岩系列特征,锆石的εHf(t)值主要集中在0.7~8.3之间,其二阶段Hf模式年龄($T_{DM_{2}}$)为672~1 168 Ma,暗示其源区主要为新元古代—中元古代岩石圈地幔。综合地球化学、锆石Hf同位素组成特征及区域地质资料,认为古罗和王姜冲岩体是在板内伸展-减薄环境主要由亏损的软流圈地幔和富集的岩石圈地幔岩浆混合形成,且在上升过程中受到壳源组分混染。
中图分类号:
农军年, 郭尚宇, 孙明行, 唐娟红, 覃瑞才, 周秋娥. 桂东南古罗和王姜冲钾玄质辉长岩的成因:地球化学、锆石U-Pb年代学及Hf同位素特征制约[J]. 现代地质, 2020, 34(05): 1001-1014.
NONG Junnian, GUO Shangyu, SUN Minghang, TANG Juanhong, QIN Ruicai, ZHOU Qiue. Petrogenesis of the Guluo and Wangjiangchong Shoshonite-gabbro in Southeastern Guangxi Province: Constraints from Petrochemistry, Zircon U-Pb Age and Hf Isotope[J]. Geoscience, 2020, 34(05): 1001-1014.
图1 区域大地构造位置图 (a)、区域构造简图(b)和古罗地区地质图(c)((a)据文献[14]修改;(b)据文献[12]修改;(c)据文献[15]修改) 1.黄洞口组三段;2.黄洞口组二段;3.黄洞口组一段;4.小内冲组;5.培地组;6.侏罗世辉长岩;7.花岗岩;8.逆断层及产状;9.断层;10.年龄样位置点
Fig.1 Regional geotectonic location map (a), schematic regional tectonic map (b), and geologic map of the Guluo area (c)
图2 古罗辉长岩野外露头及镜下照片 (a)辉长岩手标本;(b)辉长岩,辉长结构;(c)辉长岩,角闪石边缘被绿色角闪石取代;(d)辉长岩,片状黑云母中含有束状矽线石次生蚀变矿物;Prx .辉石;Hb.角闪石;Pl .斜长石;Bit .黑云母;Sil.矽线石;Ap.磷灰石
Fig.2 Outcrop and thin-section microscopic photographs of the Guluo gabbro
测点 编号 | wB/10-6 | Th/U | 同位素比值 | 年龄/Ma | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Th | U | Pb | 207Pb/206Pb±1σ | 207Pb/235U±1σ | 206Pb/238U±1σ | 207Pb/206Pb ±1σ | 207Pb/235U ±1σ | 206Pb/238U ±1σ | ||||||
GL-1 (古罗 岩体) | 1 | 391 | 330 | 39 | 1.19 | 0.048 93±0.001 39 | 0.174 53±0.004 65 | 0.025 87±0.000 21 | 144±47 | 163±4 | 165±1 | |||
2 | 302 | 255 | 32 | 1.19 | 0.048 83±0.004 19 | 0.186 24±0.015 75 | 0.027 66±0.000 39 | 140±163 | 173±13 | 176±2 | ||||
3 | 340 | 417 | 48 | 0.82 | 0.048 81±0.001 43 | 0.173 98±0.004 80 | 0.025 85±0.000 21 | 139±49 | 163±4 | 165±1 | ||||
4 | 268 | 220 | 26 | 1.22 | 0.049 06±0.002 78 | 0.175 13±0.009 70 | 0.025 89±0.000 28 | 151±106 | 164±8 | 165±2 | ||||
5 | 631 | 524 | 63 | 1.21 | 0.049 50±0.001 90 | 0.176 35±0.006 51 | 0.025 84±0.000 24 | 172±69 | 165±6 | 164±2 | ||||
6 | 1 028 | 761 | 92 | 1.35 | 0.048 96±0.001 02 | 0.174 58±0.003 27 | 0.025 86±0.000 18 | 146±31 | 163±3 | 165±1 | ||||
7 | 1 004 | 659 | 77 | 1.52 | 0.050 31±0.002 58 | 0.174 69±0.008 73 | 0.025 18±0.000 27 | 209±96 | 163±8 | 160±2 | ||||
8 | 116 | 154 | 17 | 0.75 | 0.050 60±0.004 06 | 0.177 25±0.013 92 | 0.025 41±0.000 42 | 223±147 | 166±12 | 162±3 | ||||
9 | 560 | 465 | 55 | 1.20 | 0.049 16±0.001 34 | 0.173 67±0.004 44 | 0.025 62±0.000 20 | 155±45 | 163±4 | 163±1 | ||||
10 | 352 | 344 | 40 | 1.02 | 0.050 13±0.001 41 | 0.177 66±0.004 69 | 0.025 71±0.000 20 | 201±47 | 166±4 | 164±1 | ||||
11 | 1 067 | 691 | 82 | 1.55 | 0.049 08±0.001 17 | 0.171 59±0.003 77 | 0.025 36±0.000 19 | 152±37 | 161±3 | 161±1 | ||||
12 | 752 | 516 | 63 | 1.46 | 0.049 96±0.001 30 | 0.176 85±0.004 29 | 0.025 67±0.000 20 | 193±42 | 165±4 | 163±1 | ||||
13 | 331 | 381 | 43 | 0.87 | 0.049 83±0.002 54 | 0.174 85±0.008 68 | 0.025 45±0.000 26 | 187±96 | 164±8 | 162±2 | ||||
14 | 1 069 | 921 | 107 | 1.16 | 0.049 04±0.001 02 | 0.172 35±0.003 22 | 0.025 49±0.000 18 | 150±30 | 161±3 | 162±1 | ||||
15 | 375 | 298 | 36 | 1.26 | 0.048 97±0.002 80 | 0.173 81±0.009 74 | 0.025 74±0.000 28 | 146±107 | 163±8 | 164±2 | ||||
16 | 448 | 298 | 35 | 1.50 | 0.050 10±0.003 89 | 0.175 05±0.013 31 | 0.025 35±0.000 38 | 200±144 | 164±12 | 161±2 | ||||
17 | 194 | 261 | 31 | 0.74 | 0.049 44±0.002 43 | 0.180 53±0.008 61 | 0.026 49±0.000 30 | 169±90 | 169±7 | 169±2 | ||||
18 | 804 | 594 | 72 | 1.35 | 0.050 15±0.001 68 | 0.177 18±0.005 68 | 0.025 63±0.000 22 | 202±58 | 166±5 | 163±1 | ||||
19 | 59 | 87 | 10 | 0.68 | 0.052 44±0.129 43 | 0.182 72±0.449 77 | 0.025 28±0.004 79 | 305±2 844 | 170±386 | 161±30 | ||||
20 | 836 | 624 | 76 | 1.34 | 0.048 59±0.001 14 | 0.172 27±0.003 74 | 0.025 72±0.000 19 | 128±37 | 161±3 | 164±1 | ||||
21 | 515 | 453 | 55 | 1.14 | 0.049 49±0.001 41 | 0.177 16±0.004 76 | 0.025 97±0.000 20 | 171±48 | 166±4 | 165±1 | ||||
22 | 955 | 798 | 97 | 1.20 | 0.048 90±0.000 93 | 0.174 92±0.002 95 | 0.025 95±0.000 18 | 143±27 | 164±3 | 165±1 | ||||
23 | 1 188 | 670 | 83 | 1.77 | 0.049 31±0.002 15 | 0.172 27±0.007 30 | 0.025 34±0.000 24 | 163±81 | 161±6 | 161±2 | ||||
24 | 535 | 548 | 65 | 0.98 | 0.050 08±0.001 58 | 0.175 78±0.005 30 | 0.025 46±0.000 20 | 199±55 | 164±5 | 162±1 | ||||
25 | 1 158 | 741 | 89 | 1.56 | 0.050 30±0.002 61 | 0.175 97±0.008 90 | 0.025 38±0.000 27 | 209±98 | 165±8 | 162±2 | ||||
26 | 214 | 233 | 28 | 0.92 | 0.048 59±0.002 04 | 0.174 18±0.007 06 | 0.026 01±0.000 25 | 128±76 | 163±6 | 166±2 | ||||
27 | 246 | 328 | 38 | 0.75 | 0.049 92±0.001 36 | 0.177 17±0.004 53 | 0.025 75±0.000 21 | 191±44 | 166±4 | 164±1 | ||||
28 | 324 | 329 | 40 | 0.99 | 0.048 86±0.001 25 | 0.175 47±0.004 18 | 0.026 05±0.000 20 | 141±41 | 164±4 | 166±1 | ||||
29 | 626 | 554 | 67 | 1.13 | 0.048 81±0.001 07 | 0.173 51±0.003 48 | 0.025 79±0.000 18 | 139±34 | 162±3 | 164±1 | ||||
30 | 625 | 454 | 56 | 1.38 | 0.048 95±0.001 39 | 0.175 75±0.004 72 | 0.026 05±0.000 22 | 145±47 | 164±4 | 166±1 | ||||
WJC-2 (王姜 冲岩体) | 1 | 658 | 468 | 45 | 0.71 | 0.048 70±0.001 10 | 0.166 15±0.003 46 | 0.024 76±0.000 18 | 133±35 | 156±3 | 158±1 | |||
2 | 286 | 275 | 28 | 0.96 | 0.048 51±0.002 87 | 0.170 88±0.009 89 | 0.025 56±0.000 31 | 124±107 | 160±9 | 163±2 | ||||
3 | 961 | 533 | 51 | 0.55 | 0.050 03±0.001 10 | 0.169 09±0.003 39 | 0.024 53±0.000 18 | 196±33 | 159±3 | 156±1 | ||||
4 | 1 482 | 927 | 89 | 0.63 | 0.050 04±0.000 93 | 0.169 00±0.002 79 | 0.024 51±0.000 17 | 197±25 | 159±2 | 156±1 | ||||
5 | 1 338 | 783 | 76 | 0.58 | 0.048 56±0.001 02 | 0.165 08±0.003 14 | 0.024 67±0.000 17 | 127±32 | 155±3 | 157±1 | ||||
6 | 273 | 228 | 22 | 0.83 | 0.048 46±0.002 48 | 0.168 43±0.008 40 | 0.025 22±0.000 26 | 122±93 | 158±7 | 161±2 | ||||
7 | 1 117 | 680 | 66 | 0.61 | 0.049 76±0.001 10 | 0.171 53±0.003 45 | 0.025 01±0.000 18 | 184±33 | 161±3 | 159±1 | ||||
8 | 297 | 331 | 32 | 1.11 | 0.049 24±0.002 06 | 0.168 30±0.006 80 | 0.024 79±0.000 25 | 159±75 | 158±6 | 158±2 | ||||
9 | 245 | 220 | 21 | 0.90 | 0.049 16±0.003 44 | 0.166 86±0.011 44 | 0.024 63±0.000 34 | 155±129 | 157±10 | 157±2 | ||||
10 | 961 | 624 | 60 | 0.65 | 0.049 21±0.001 13 | 0.167 64±0.003 52 | 0.024 71±0.000 18 | 158±35 | 157±3 | 157±1 | ||||
11 | 959 | 524 | 50 | 0.55 | 0.049 91±0.001 26 | 0.168 86±0.003 97 | 0.024 54±0.000 19 | 191±40 | 158±3 | 156±1 | ||||
12 | 279 | 211 | 20 | 0.76 | 0.049 09±0.001 63 | 0.167 44±0.005 31 | 0.024 74±0.000 21 | 152±58 | 157±5 | 158±1 | ||||
13 | 270 | 238 | 23 | 0.88 | 0.049 55±0.003 07 | 0.171 22±0.010 38 | 0.025 07±0.000 30 | 174±116 | 160±9 | 160±2 | ||||
测点 编号 | wB/10-6 | Th/U | 同位素比值 | 年龄/Ma | ||||||||||
Th | U | Pb | 207Pb/206Pb±1σ | 207Pb/235U±1σ | 206Pb/238U±1σ | 207Pb/206Pb ±1σ | 207Pb/235U ±1σ | 206Pb/238U ±1σ | ||||||
WJC-2 (王姜 冲岩体) | 14 | 1 378 | 785 | 76 | 0.57 | 0.049 43±0.001 34 | 0.169 32±0.004 29 | 0.024 85±0.000 20 | 168±44 | 159±4 | 158±1 | |||
16 | 313 | 286 | 28 | 0.91 | 0.049 28±0.002 67 | 0.171 07±0.008 98 | 0.025 18±0.000 31 | 161±97 | 160±8 | 160±2 | ||||
17 | 967 | 738 | 71 | 0.76 | 0.048 87±0.000 97 | 0.166 49±0.002 96 | 0.024 71±0.000 17 | 142±29 | 156±3 | 157±1 | ||||
18 | 1 695 | 1 095 | 106 | 0.65 | 0.049 43±0.000 83 | 0.170 12±0.002 45 | 0.024 96±0.000 16 | 168±22 | 160±2 | 159±1 | ||||
19 | 163 | 300 | 29 | 1.83 | 0.048 87±0.003 67 | 0.170 76±0.012 55 | 0.025 34±0.000 38 | 142±137 | 160±11 | 161±2 | ||||
20 | 517 | 508 | 52 | 0.98 | 0.051 21±0.006 10 | 0.184 67±0.021 59 | 0.026 15±0.000 62 | 250±220 | 172±19 | 166±4 | ||||
21 | 352 | 347 | 33 | 0.99 | 0.049 72±0.002 00 | 0.169 44±0.006 56 | 0.024 71±0.000 25 | 182±71 | 159±6 | 157±2 | ||||
22 | 322 | 328 | 32 | 1.02 | 0.049 82±0.002 17 | 0.172 48±0.007 24 | 0.025 11±0.000 27 | 187±78 | 162±6 | 160±2 | ||||
23 | 265 | 293 | 30 | 1.11 | 0.048 81±0.003 22 | 0.176 61±0.011 41 | 0.026 24±0.000 32 | 139±123 | 165±10 | 167±2 | ||||
24 | 240 | 283 | 28 | 1.18 | 0.049 49±0.003 92 | 0.172 08±0.013 35 | 0.025 22±0.000 39 | 171±146 | 161±12 | 161±2 | ||||
25 | 459 | 422 | 41 | 0.92 | 0.049 66±0.001 62 | 0.171 32±0.005 35 | 0.025 02±0.000 20 | 179±58 | 161±5 | 159±1 | ||||
26 | 353 | 306 | 30 | 0.87 | 0.049 23±0.001 34 | 0.172 39±0.004 40 | 0.025 40±0.000 20 | 159±45 | 161±4 | 162±1 | ||||
27 | 891 | 653 | 63 | 0.73 | 0.049 38±0.000 96 | 0.169 29±0.002 92 | 0.024 86±0.000 17 | 166±27 | 159±3 | 158±1 | ||||
28 | 605 | 440 | 41 | 0.73 | 0.049 93±0.001 19 | 0.168 65±0.003 07 | 0.024 50±0.000 18 | 192±37 | 158±3 | 156±1 | ||||
29 | 222 | 234 | 23 | 1.05 | 0.049 52±0.002 89 | 0.172 50±0.009 78 | 0.025 26±0.000 33 | 173±105 | 162±8 | 161±2 | ||||
30 | 441 | 468 | 45 | 1.06 | 0.049 13±0.001 10 | 0.169 53±0.003 45 | 0.025 03±0.000 18 | 154±34 | 159±3 | 159±1 |
表1 古罗和王姜冲辉长岩LA-ICP-MS锆石U-Pb年龄分析数据
Table 1 LA-ICP-MS zircon U-Pb data of the Guluo and Wangjiangchong gabbros
测点 编号 | wB/10-6 | Th/U | 同位素比值 | 年龄/Ma | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Th | U | Pb | 207Pb/206Pb±1σ | 207Pb/235U±1σ | 206Pb/238U±1σ | 207Pb/206Pb ±1σ | 207Pb/235U ±1σ | 206Pb/238U ±1σ | ||||||
GL-1 (古罗 岩体) | 1 | 391 | 330 | 39 | 1.19 | 0.048 93±0.001 39 | 0.174 53±0.004 65 | 0.025 87±0.000 21 | 144±47 | 163±4 | 165±1 | |||
2 | 302 | 255 | 32 | 1.19 | 0.048 83±0.004 19 | 0.186 24±0.015 75 | 0.027 66±0.000 39 | 140±163 | 173±13 | 176±2 | ||||
3 | 340 | 417 | 48 | 0.82 | 0.048 81±0.001 43 | 0.173 98±0.004 80 | 0.025 85±0.000 21 | 139±49 | 163±4 | 165±1 | ||||
4 | 268 | 220 | 26 | 1.22 | 0.049 06±0.002 78 | 0.175 13±0.009 70 | 0.025 89±0.000 28 | 151±106 | 164±8 | 165±2 | ||||
5 | 631 | 524 | 63 | 1.21 | 0.049 50±0.001 90 | 0.176 35±0.006 51 | 0.025 84±0.000 24 | 172±69 | 165±6 | 164±2 | ||||
6 | 1 028 | 761 | 92 | 1.35 | 0.048 96±0.001 02 | 0.174 58±0.003 27 | 0.025 86±0.000 18 | 146±31 | 163±3 | 165±1 | ||||
7 | 1 004 | 659 | 77 | 1.52 | 0.050 31±0.002 58 | 0.174 69±0.008 73 | 0.025 18±0.000 27 | 209±96 | 163±8 | 160±2 | ||||
8 | 116 | 154 | 17 | 0.75 | 0.050 60±0.004 06 | 0.177 25±0.013 92 | 0.025 41±0.000 42 | 223±147 | 166±12 | 162±3 | ||||
9 | 560 | 465 | 55 | 1.20 | 0.049 16±0.001 34 | 0.173 67±0.004 44 | 0.025 62±0.000 20 | 155±45 | 163±4 | 163±1 | ||||
10 | 352 | 344 | 40 | 1.02 | 0.050 13±0.001 41 | 0.177 66±0.004 69 | 0.025 71±0.000 20 | 201±47 | 166±4 | 164±1 | ||||
11 | 1 067 | 691 | 82 | 1.55 | 0.049 08±0.001 17 | 0.171 59±0.003 77 | 0.025 36±0.000 19 | 152±37 | 161±3 | 161±1 | ||||
12 | 752 | 516 | 63 | 1.46 | 0.049 96±0.001 30 | 0.176 85±0.004 29 | 0.025 67±0.000 20 | 193±42 | 165±4 | 163±1 | ||||
13 | 331 | 381 | 43 | 0.87 | 0.049 83±0.002 54 | 0.174 85±0.008 68 | 0.025 45±0.000 26 | 187±96 | 164±8 | 162±2 | ||||
14 | 1 069 | 921 | 107 | 1.16 | 0.049 04±0.001 02 | 0.172 35±0.003 22 | 0.025 49±0.000 18 | 150±30 | 161±3 | 162±1 | ||||
15 | 375 | 298 | 36 | 1.26 | 0.048 97±0.002 80 | 0.173 81±0.009 74 | 0.025 74±0.000 28 | 146±107 | 163±8 | 164±2 | ||||
16 | 448 | 298 | 35 | 1.50 | 0.050 10±0.003 89 | 0.175 05±0.013 31 | 0.025 35±0.000 38 | 200±144 | 164±12 | 161±2 | ||||
17 | 194 | 261 | 31 | 0.74 | 0.049 44±0.002 43 | 0.180 53±0.008 61 | 0.026 49±0.000 30 | 169±90 | 169±7 | 169±2 | ||||
18 | 804 | 594 | 72 | 1.35 | 0.050 15±0.001 68 | 0.177 18±0.005 68 | 0.025 63±0.000 22 | 202±58 | 166±5 | 163±1 | ||||
19 | 59 | 87 | 10 | 0.68 | 0.052 44±0.129 43 | 0.182 72±0.449 77 | 0.025 28±0.004 79 | 305±2 844 | 170±386 | 161±30 | ||||
20 | 836 | 624 | 76 | 1.34 | 0.048 59±0.001 14 | 0.172 27±0.003 74 | 0.025 72±0.000 19 | 128±37 | 161±3 | 164±1 | ||||
21 | 515 | 453 | 55 | 1.14 | 0.049 49±0.001 41 | 0.177 16±0.004 76 | 0.025 97±0.000 20 | 171±48 | 166±4 | 165±1 | ||||
22 | 955 | 798 | 97 | 1.20 | 0.048 90±0.000 93 | 0.174 92±0.002 95 | 0.025 95±0.000 18 | 143±27 | 164±3 | 165±1 | ||||
23 | 1 188 | 670 | 83 | 1.77 | 0.049 31±0.002 15 | 0.172 27±0.007 30 | 0.025 34±0.000 24 | 163±81 | 161±6 | 161±2 | ||||
24 | 535 | 548 | 65 | 0.98 | 0.050 08±0.001 58 | 0.175 78±0.005 30 | 0.025 46±0.000 20 | 199±55 | 164±5 | 162±1 | ||||
25 | 1 158 | 741 | 89 | 1.56 | 0.050 30±0.002 61 | 0.175 97±0.008 90 | 0.025 38±0.000 27 | 209±98 | 165±8 | 162±2 | ||||
26 | 214 | 233 | 28 | 0.92 | 0.048 59±0.002 04 | 0.174 18±0.007 06 | 0.026 01±0.000 25 | 128±76 | 163±6 | 166±2 | ||||
27 | 246 | 328 | 38 | 0.75 | 0.049 92±0.001 36 | 0.177 17±0.004 53 | 0.025 75±0.000 21 | 191±44 | 166±4 | 164±1 | ||||
28 | 324 | 329 | 40 | 0.99 | 0.048 86±0.001 25 | 0.175 47±0.004 18 | 0.026 05±0.000 20 | 141±41 | 164±4 | 166±1 | ||||
29 | 626 | 554 | 67 | 1.13 | 0.048 81±0.001 07 | 0.173 51±0.003 48 | 0.025 79±0.000 18 | 139±34 | 162±3 | 164±1 | ||||
30 | 625 | 454 | 56 | 1.38 | 0.048 95±0.001 39 | 0.175 75±0.004 72 | 0.026 05±0.000 22 | 145±47 | 164±4 | 166±1 | ||||
WJC-2 (王姜 冲岩体) | 1 | 658 | 468 | 45 | 0.71 | 0.048 70±0.001 10 | 0.166 15±0.003 46 | 0.024 76±0.000 18 | 133±35 | 156±3 | 158±1 | |||
2 | 286 | 275 | 28 | 0.96 | 0.048 51±0.002 87 | 0.170 88±0.009 89 | 0.025 56±0.000 31 | 124±107 | 160±9 | 163±2 | ||||
3 | 961 | 533 | 51 | 0.55 | 0.050 03±0.001 10 | 0.169 09±0.003 39 | 0.024 53±0.000 18 | 196±33 | 159±3 | 156±1 | ||||
4 | 1 482 | 927 | 89 | 0.63 | 0.050 04±0.000 93 | 0.169 00±0.002 79 | 0.024 51±0.000 17 | 197±25 | 159±2 | 156±1 | ||||
5 | 1 338 | 783 | 76 | 0.58 | 0.048 56±0.001 02 | 0.165 08±0.003 14 | 0.024 67±0.000 17 | 127±32 | 155±3 | 157±1 | ||||
6 | 273 | 228 | 22 | 0.83 | 0.048 46±0.002 48 | 0.168 43±0.008 40 | 0.025 22±0.000 26 | 122±93 | 158±7 | 161±2 | ||||
7 | 1 117 | 680 | 66 | 0.61 | 0.049 76±0.001 10 | 0.171 53±0.003 45 | 0.025 01±0.000 18 | 184±33 | 161±3 | 159±1 | ||||
8 | 297 | 331 | 32 | 1.11 | 0.049 24±0.002 06 | 0.168 30±0.006 80 | 0.024 79±0.000 25 | 159±75 | 158±6 | 158±2 | ||||
9 | 245 | 220 | 21 | 0.90 | 0.049 16±0.003 44 | 0.166 86±0.011 44 | 0.024 63±0.000 34 | 155±129 | 157±10 | 157±2 | ||||
10 | 961 | 624 | 60 | 0.65 | 0.049 21±0.001 13 | 0.167 64±0.003 52 | 0.024 71±0.000 18 | 158±35 | 157±3 | 157±1 | ||||
11 | 959 | 524 | 50 | 0.55 | 0.049 91±0.001 26 | 0.168 86±0.003 97 | 0.024 54±0.000 19 | 191±40 | 158±3 | 156±1 | ||||
12 | 279 | 211 | 20 | 0.76 | 0.049 09±0.001 63 | 0.167 44±0.005 31 | 0.024 74±0.000 21 | 152±58 | 157±5 | 158±1 | ||||
13 | 270 | 238 | 23 | 0.88 | 0.049 55±0.003 07 | 0.171 22±0.010 38 | 0.025 07±0.000 30 | 174±116 | 160±9 | 160±2 | ||||
测点 编号 | wB/10-6 | Th/U | 同位素比值 | 年龄/Ma | ||||||||||
Th | U | Pb | 207Pb/206Pb±1σ | 207Pb/235U±1σ | 206Pb/238U±1σ | 207Pb/206Pb ±1σ | 207Pb/235U ±1σ | 206Pb/238U ±1σ | ||||||
WJC-2 (王姜 冲岩体) | 14 | 1 378 | 785 | 76 | 0.57 | 0.049 43±0.001 34 | 0.169 32±0.004 29 | 0.024 85±0.000 20 | 168±44 | 159±4 | 158±1 | |||
16 | 313 | 286 | 28 | 0.91 | 0.049 28±0.002 67 | 0.171 07±0.008 98 | 0.025 18±0.000 31 | 161±97 | 160±8 | 160±2 | ||||
17 | 967 | 738 | 71 | 0.76 | 0.048 87±0.000 97 | 0.166 49±0.002 96 | 0.024 71±0.000 17 | 142±29 | 156±3 | 157±1 | ||||
18 | 1 695 | 1 095 | 106 | 0.65 | 0.049 43±0.000 83 | 0.170 12±0.002 45 | 0.024 96±0.000 16 | 168±22 | 160±2 | 159±1 | ||||
19 | 163 | 300 | 29 | 1.83 | 0.048 87±0.003 67 | 0.170 76±0.012 55 | 0.025 34±0.000 38 | 142±137 | 160±11 | 161±2 | ||||
20 | 517 | 508 | 52 | 0.98 | 0.051 21±0.006 10 | 0.184 67±0.021 59 | 0.026 15±0.000 62 | 250±220 | 172±19 | 166±4 | ||||
21 | 352 | 347 | 33 | 0.99 | 0.049 72±0.002 00 | 0.169 44±0.006 56 | 0.024 71±0.000 25 | 182±71 | 159±6 | 157±2 | ||||
22 | 322 | 328 | 32 | 1.02 | 0.049 82±0.002 17 | 0.172 48±0.007 24 | 0.025 11±0.000 27 | 187±78 | 162±6 | 160±2 | ||||
23 | 265 | 293 | 30 | 1.11 | 0.048 81±0.003 22 | 0.176 61±0.011 41 | 0.026 24±0.000 32 | 139±123 | 165±10 | 167±2 | ||||
24 | 240 | 283 | 28 | 1.18 | 0.049 49±0.003 92 | 0.172 08±0.013 35 | 0.025 22±0.000 39 | 171±146 | 161±12 | 161±2 | ||||
25 | 459 | 422 | 41 | 0.92 | 0.049 66±0.001 62 | 0.171 32±0.005 35 | 0.025 02±0.000 20 | 179±58 | 161±5 | 159±1 | ||||
26 | 353 | 306 | 30 | 0.87 | 0.049 23±0.001 34 | 0.172 39±0.004 40 | 0.025 40±0.000 20 | 159±45 | 161±4 | 162±1 | ||||
27 | 891 | 653 | 63 | 0.73 | 0.049 38±0.000 96 | 0.169 29±0.002 92 | 0.024 86±0.000 17 | 166±27 | 159±3 | 158±1 | ||||
28 | 605 | 440 | 41 | 0.73 | 0.049 93±0.001 19 | 0.168 65±0.003 07 | 0.024 50±0.000 18 | 192±37 | 158±3 | 156±1 | ||||
29 | 222 | 234 | 23 | 1.05 | 0.049 52±0.002 89 | 0.172 50±0.009 78 | 0.025 26±0.000 33 | 173±105 | 162±8 | 161±2 | ||||
30 | 441 | 468 | 45 | 1.06 | 0.049 13±0.001 10 | 0.169 53±0.003 45 | 0.025 03±0.000 18 | 154±34 | 159±3 | 159±1 |
图3 古罗辉长岩和(b)王姜冲辉长岩代表性锆石颗粒CL图像(图中虚线圈为锆石U-Pb测年点,实线圈为锆石Hf同位素分析点,圈内数字为样品点编号;年龄值单位为Ma,括号内数值为εHf (t)值)
Fig.3 Representative zircon CL images of the Guluo (a) and Wangjiangchong (b) gabbros
图4 古罗辉长岩(a)和王姜冲辉长岩(b)LA-ICP-MS锆石U-Pb谐和图
Fig.4 Concordia diagrams showing LA-ICP-MS zircon U-Pb age dating results of samples from Guluo(a) and Wangjiangchong(b)gabbros
样品编号 | SiO2 | Al2O3 | Fe2O3 | FeO | CaO | MgO | Na2O | K2O | TiO2 | MnO | P2O5 | SrO | BaO | 烧失量 | 总量 | |||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
GL-1 | 40.60 | 10.80 | 19.68 | — | 10.05 | 9.42 | 2.00 | 1.41 | 3.65 | 0.23 | 0.35 | 0.07 | 0.01 | 1.69 | 101.39 | |||||||||||||||||||||
GL-2 | 47.56 | 15.95 | 4.72 | 8.13 | 6.91 | 5.67 | 2.70 | 2.04 | 2.28 | 0.18 | 1.02 | — | — | 2.42 | 99.58 | |||||||||||||||||||||
GL-3 | 46.86 | 20.15 | 3.18 | 7.15 | 8.50 | 2.26 | 3.54 | 1.72 | 1.84 | 0.16 | 1.13 | — | — | 3.21 | 99.70 | |||||||||||||||||||||
WJC-1 | 46.90 | 15.25 | 13.36 | — | 8.78 | 5.49 | 2.98 | 1.78 | 2.60 | 0.21 | 0.81 | 0.07 | 0.01 | 1.67 | 101.13 | |||||||||||||||||||||
WJC-3 | 45.86 | 16.17 | 3.12 | 10.87 | 7.90 | 4.55 | 2.73 | 2.05 | 2.51 | 0.17 | 0.88 | — | — | 2.42 | 99.23 | |||||||||||||||||||||
样品编号 | A/CNK | K/Na | ALK | Mg# | Li | Be | Sc | V | Cr | Co | Ni | Cu | Zn | Ga | Rb | |||||||||||||||||||||
GL-1 | 0.47 | 0.71 | 3.41 | 48.92 | 6.10 | 1.02 | 51.8 | 602 | 66.0 | 74.6 | 55.9 | 140.5 | 143 | 20.6 | 34.1 | |||||||||||||||||||||
GL-2 | 0.83 | 0.76 | 4.74 | 55.66 | 17.90 | 1.95 | 34.3 | 339 | 41.4 | 39.1 | 14.9 | 36.5 | 111 | 26.5 | 99.6 | |||||||||||||||||||||
GL-3 | 0.87 | 0.49 | 5.26 | 36.26 | 12.20 | 2.04 | 11.6 | 257 | 37.0 | 26.1 | 11.6 | 86.3 | 87 | 26.6 | 78.8 | |||||||||||||||||||||
WJC-1 | 0.67 | 0.60 | 4.76 | 45.12 | 7.50 | 1.47 | 28.6 | 281 | 31.0 | 38.5 | 21.0 | 131.5 | 117 | 23.4 | 58.1 | |||||||||||||||||||||
WJC-3 | 0.77 | 0.75 | 4.78 | 42.97 | 13.80 | 1.77 | 25.3 | 424 | 110.0 | 55.4 | 38.2 | 172.4 | 123 | 27.8 | 74.9 | |||||||||||||||||||||
样品编号 | Sr | Zr | Nb | Cs | Ba | Hf | Ta | Pb | Th | U | La | Ce | Pr | Nd | Sm | Eu | ||||||||||||||||||||
GL-1 | 518 | 90.7 | 43.6 | 0.94 | 420 | 3.40 | 2.66 | 3.30 | 3.20 | 0.70 | 35.0 | 79.2 | 10.5 | 42.4 | 8.35 | 2.81 | ||||||||||||||||||||
GL-2 | 703 | 192.0 | 41.7 | — | 857 | 5.36 | 3.23 | 6.81 | 6.83 | 1.44 | 51.4 | 104.0 | 13.5 | 55.1 | 11.00 | 3.05 | ||||||||||||||||||||
GL-3 | 1 034 | 201.0 | 36.5 | — | 527 | 8.62 | 2.37 | 12.20 | 6.51 | 1.50 | 49.7 | 97.7 | 12.8 | 51.6 | 9.00 | 2.47 | ||||||||||||||||||||
WJC-1 | 985 | 87.8 | 59.1 | 3.15 | 580 | 3.70 | 3.19 | 5.00 | 5.50 | 1.20 | 61.9 | 133.5 | 17.2 | 67.2 | 12.25 | 3.85 | ||||||||||||||||||||
WJC-3 | 862 | 267.0 | 46.5 | — | 793 | 6.78 | 3.35 | 6.26 | 6.27 | 1.67 | 51.4 | 101.0 | 12.2 | 47.5 | 8.83 | 2.50 | ||||||||||||||||||||
样品编号 | Gd | Tb | Dy | Ho | Er | Tm | Yb | Lu | Y | ΣREE | LREE | L/H | (La/Yb)N | δEu | δCe | |||||||||||||||||||||
GL-1 | 8.22 | 1.18 | 6.39 | 1.24 | 3.39 | 0.41 | 2.52 | 0.36 | 33.1 | 201.97 | 178.26 | 7.52 | 9.96 | 1.02 | 1.00 | |||||||||||||||||||||
GL-2 | 10.16 | 1.38 | 7.56 | 1.41 | 3.89 | 0.54 | 3.31 | 0.48 | 37.4 | 266.78 | 238.05 | 8.29 | 11.14 | 0.87 | 0.95 | |||||||||||||||||||||
GL-3 | 7.72 | 1.06 | 5.82 | 1.04 | 2.80 | 0.38 | 2.38 | 0.34 | 27.4 | 244.81 | 223.27 | 10.37 | 14.98 | 0.88 | 0.93 | |||||||||||||||||||||
WJC-1 | 11.00 | 1.58 | 8.40 | 1.61 | 4.47 | 0.56 | 3.44 | 0.50 | 45.7 | 327.46 | 295.90 | 9.38 | 12.91 | 0.99 | 0.99 | |||||||||||||||||||||
WJC-3 | 7.88 | 1.03 | 5.69 | 1.05 | 2.83 | 0.40 | 2.47 | 0.37 | 27.6 | 245.15 | 223.43 | 10.29 | 14.93 | 0.90 | 0.96 |
表2 古罗和王姜冲辉长岩样品主量元素(wB/%)、微量元素(wB/10-6)及稀土元素(wB/10-6)分析结果
Table 2 Major (%), trace element (10-6) and REE (10-6) contents of the Guluo and Wangjiangchong gabbro samples
样品编号 | SiO2 | Al2O3 | Fe2O3 | FeO | CaO | MgO | Na2O | K2O | TiO2 | MnO | P2O5 | SrO | BaO | 烧失量 | 总量 | |||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
GL-1 | 40.60 | 10.80 | 19.68 | — | 10.05 | 9.42 | 2.00 | 1.41 | 3.65 | 0.23 | 0.35 | 0.07 | 0.01 | 1.69 | 101.39 | |||||||||||||||||||||
GL-2 | 47.56 | 15.95 | 4.72 | 8.13 | 6.91 | 5.67 | 2.70 | 2.04 | 2.28 | 0.18 | 1.02 | — | — | 2.42 | 99.58 | |||||||||||||||||||||
GL-3 | 46.86 | 20.15 | 3.18 | 7.15 | 8.50 | 2.26 | 3.54 | 1.72 | 1.84 | 0.16 | 1.13 | — | — | 3.21 | 99.70 | |||||||||||||||||||||
WJC-1 | 46.90 | 15.25 | 13.36 | — | 8.78 | 5.49 | 2.98 | 1.78 | 2.60 | 0.21 | 0.81 | 0.07 | 0.01 | 1.67 | 101.13 | |||||||||||||||||||||
WJC-3 | 45.86 | 16.17 | 3.12 | 10.87 | 7.90 | 4.55 | 2.73 | 2.05 | 2.51 | 0.17 | 0.88 | — | — | 2.42 | 99.23 | |||||||||||||||||||||
样品编号 | A/CNK | K/Na | ALK | Mg# | Li | Be | Sc | V | Cr | Co | Ni | Cu | Zn | Ga | Rb | |||||||||||||||||||||
GL-1 | 0.47 | 0.71 | 3.41 | 48.92 | 6.10 | 1.02 | 51.8 | 602 | 66.0 | 74.6 | 55.9 | 140.5 | 143 | 20.6 | 34.1 | |||||||||||||||||||||
GL-2 | 0.83 | 0.76 | 4.74 | 55.66 | 17.90 | 1.95 | 34.3 | 339 | 41.4 | 39.1 | 14.9 | 36.5 | 111 | 26.5 | 99.6 | |||||||||||||||||||||
GL-3 | 0.87 | 0.49 | 5.26 | 36.26 | 12.20 | 2.04 | 11.6 | 257 | 37.0 | 26.1 | 11.6 | 86.3 | 87 | 26.6 | 78.8 | |||||||||||||||||||||
WJC-1 | 0.67 | 0.60 | 4.76 | 45.12 | 7.50 | 1.47 | 28.6 | 281 | 31.0 | 38.5 | 21.0 | 131.5 | 117 | 23.4 | 58.1 | |||||||||||||||||||||
WJC-3 | 0.77 | 0.75 | 4.78 | 42.97 | 13.80 | 1.77 | 25.3 | 424 | 110.0 | 55.4 | 38.2 | 172.4 | 123 | 27.8 | 74.9 | |||||||||||||||||||||
样品编号 | Sr | Zr | Nb | Cs | Ba | Hf | Ta | Pb | Th | U | La | Ce | Pr | Nd | Sm | Eu | ||||||||||||||||||||
GL-1 | 518 | 90.7 | 43.6 | 0.94 | 420 | 3.40 | 2.66 | 3.30 | 3.20 | 0.70 | 35.0 | 79.2 | 10.5 | 42.4 | 8.35 | 2.81 | ||||||||||||||||||||
GL-2 | 703 | 192.0 | 41.7 | — | 857 | 5.36 | 3.23 | 6.81 | 6.83 | 1.44 | 51.4 | 104.0 | 13.5 | 55.1 | 11.00 | 3.05 | ||||||||||||||||||||
GL-3 | 1 034 | 201.0 | 36.5 | — | 527 | 8.62 | 2.37 | 12.20 | 6.51 | 1.50 | 49.7 | 97.7 | 12.8 | 51.6 | 9.00 | 2.47 | ||||||||||||||||||||
WJC-1 | 985 | 87.8 | 59.1 | 3.15 | 580 | 3.70 | 3.19 | 5.00 | 5.50 | 1.20 | 61.9 | 133.5 | 17.2 | 67.2 | 12.25 | 3.85 | ||||||||||||||||||||
WJC-3 | 862 | 267.0 | 46.5 | — | 793 | 6.78 | 3.35 | 6.26 | 6.27 | 1.67 | 51.4 | 101.0 | 12.2 | 47.5 | 8.83 | 2.50 | ||||||||||||||||||||
样品编号 | Gd | Tb | Dy | Ho | Er | Tm | Yb | Lu | Y | ΣREE | LREE | L/H | (La/Yb)N | δEu | δCe | |||||||||||||||||||||
GL-1 | 8.22 | 1.18 | 6.39 | 1.24 | 3.39 | 0.41 | 2.52 | 0.36 | 33.1 | 201.97 | 178.26 | 7.52 | 9.96 | 1.02 | 1.00 | |||||||||||||||||||||
GL-2 | 10.16 | 1.38 | 7.56 | 1.41 | 3.89 | 0.54 | 3.31 | 0.48 | 37.4 | 266.78 | 238.05 | 8.29 | 11.14 | 0.87 | 0.95 | |||||||||||||||||||||
GL-3 | 7.72 | 1.06 | 5.82 | 1.04 | 2.80 | 0.38 | 2.38 | 0.34 | 27.4 | 244.81 | 223.27 | 10.37 | 14.98 | 0.88 | 0.93 | |||||||||||||||||||||
WJC-1 | 11.00 | 1.58 | 8.40 | 1.61 | 4.47 | 0.56 | 3.44 | 0.50 | 45.7 | 327.46 | 295.90 | 9.38 | 12.91 | 0.99 | 0.99 | |||||||||||||||||||||
WJC-3 | 7.88 | 1.03 | 5.69 | 1.05 | 2.83 | 0.40 | 2.47 | 0.37 | 27.6 | 245.15 | 223.43 | 10.29 | 14.93 | 0.90 | 0.96 |
图5 辉长岩样品SiO2-(K2O+ Na2O)((a),底图据文献[28])和SiO2-K2O图解((b),底图据文献[29,30] ) Ir.Irvine分界线,上方为碱性,下方为亚碱性;1.橄榄辉长岩;2a.碱性辉长岩;2b.亚碱性辉长岩;3.辉长闪长岩;4.闪长岩;5.花岗闪长岩;6.花岗岩;7.硅英岩;8.二长辉长岩;9.二长闪长岩;10.二长岩;11.石英二长岩;12.正长岩;13.副长石辉长岩;14.副长石二长闪长岩;15.副长石二长正长岩;16.副长正长岩;17.副长深成岩;18.霓方钠岩/磷霞岩/粗白榴岩
Fig.5 SiO2-(K2O+ Na2O) ((a),base map after reference [28]) and SiO2-K2O diagrams for the gabbro samples ((b),base map after references [29-30])
图6 辉长岩样品稀土元素球粒陨石标准化配分图((a),底图据文献[31])和微量元素原始地幔标准化蛛网图((b),底图据文献[31])
Fig.6 Chondrite-normalized REE patterns ((a),base map after reference [31]) and primitive-mantle-normalized multi-element spidergram for gabbro samples ((b),base map after reference[31])
样品及 分析点号 | 年龄/Ma | 176Yb/ 177Hf | 176Lu/ 177Hf | 176Hf/177Hf±2σ | TDM /Ma | /Ma | εHf(0) | εHf(t) | ||
---|---|---|---|---|---|---|---|---|---|---|
GL-1 (古罗岩体) | 1 | 165 | 0.090 269 | 0.001 619 | 0.282 756±0.000 027 | 714 | 1 028 | -0.55 | 2.9 | -0.96 |
2 | 176 | 0.076 848 | 0.001 362 | 0.282 822±0.000 030 | 615 | 871 | 1.77 | 5.5 | -0.95 | |
3 | 165 | 0.093 650 | 0.001 705 | 0.282 830±0.000 026 | 609 | 862 | 2.05 | 5.5 | -0.98 | |
4 | 165 | 0.030 093 | 0.000 560 | 0.282 723±0.000 027 | 741 | 1 097 | -1.74 | 1.8 | -0.96 | |
5 | 164 | 0.071 446 | 0.001 235 | 0.282 817±0.000 025 | 620 | 889 | 1.59 | 5.1 | -0.93 | |
6 | 165 | 0.132 881 | 0.002 177 | 0.282 841±0.000 030 | 601 | 840 | 2.44 | 5.8 | -0.95 | |
7 | 160 | 0.094 543 | 0.001 611 | 0.282 837±0.000 023 | 597 | 848 | 2.31 | 5.7 | -0.96 | |
8 | 162 | 0.079 647 | 0.001 325 | 0.282 821±0.000 026 | 617 | 882 | 1.72 | 5.1 | -0.97 | |
9 | 163 | 0.060 721 | 0.001 059 | 0.282 693±0.000 026 | 793 | 1 168 | -2.78 | 0.7 | -0.95 | |
10 | 164 | 0.089 598 | 0.001 512 | 0.282 762±0.000 027 | 704 | 1 015 | -0.36 | 3.1 | -0.93 | |
11 | 161 | 0.135 710 | 0.002 228 | 0.282 873±0.000 028 | 556 | 771 | 3.56 | 6.9 | -0.95 | |
12 | 163 | 0.098 089 | 0.001 644 | 0.282 773±0.000 024 | 691 | 993 | 0.02 | 3.4 | -0.96 | |
13 | 162 | 0.072 985 | 0.001 324 | 0.282 746±0.000 022 | 723 | 1 050 | -0.91 | 2.5 | -0.94 | |
15 | 164 | 0.110 921 | 0.001 891 | 0.282 841±0.000 026 | 597 | 840 | 2.42 | 5.8 | -0.95 | |
16 | 161 | 0.090 756 | 0.001 517 | 0.282 769±0.000 027 | 694 | 1 001 | -0.11 | 3.3 | -0.97 | |
17 | 169 | 0.058 462 | 0.001 007 | 0.282 751±0.000 026 | 710 | 1 034 | -0.75 | 2.9 | -0.94 | |
18 | 163 | 0.108 347 | 0.001 835 | 0.282 893±0.000 027 | 521 | 722 | 4.27 | 7.7 | -0.96 | |
20 | 164 | 0.070 769 | 0.001 247 | 0.282 795±0.000 025 | 651 | 938 | 0.83 | 4.3 | -0.94 | |
21 | 165 | 0.114 290 | 0.001 901 | 0.282 836±0.000 024 | 604 | 850 | 2.27 | 5.7 | -0.95 | |
22 | 165 | 0.093 102 | 0.001 675 | 0.282 774±0.000 023 | 690 | 989 | 0.07 | 3.5 | -0.94 | |
23 | 161 | 0.121 754 | 0.002 080 | 0.282 777±0.000 029 | 693 | 987 | 0.18 | 3.5 | -0.93 | |
24 | 162 | 0.135 761 | 0.002 356 | 0.282 886±0.000 026 | 538 | 741 | 4.04 | 7.3 | -0.94 | |
25 | 162 | 0.106 936 | 0.001 850 | 0.282 757±0.000 029 | 718 | 1 031 | -0.55 | 2.8 | -0.98 | |
26 | 166 | 0.034 608 | 0.000 645 | 0.282 742±0.000 022 | 717 | 1 054 | -1.08 | 2.5 | -0.97 | |
27 | 164 | 0.048 099 | 0.000 851 | 0.282 717±0.000 026 | 755 | 1 113 | -1.96 | 1.6 | -0.96 | |
28 | 166 | 0.079 346 | 0.001 421 | 0.282 824±0.000 024 | 613 | 872 | 1.85 | 5.3 | -0.96 | |
29 | 164 | 0.079 920 | 0.001 368 | 0.282 821±0.000 023 | 618 | 882 | 1.72 | 5.2 | -0.94 | |
30 | 166 | 0.122 002 | 0.002 123 | 0.282 821±0.000 027 | 629 | 884 | 1.74 | 5.2 | -0.96 | |
WJC-2 (王姜 冲岩体) | 1 | 158 | 0.122 478 | 0.002 081 | 0.282 863±0.000 028 | 568 | 794 | 3.21 | 6.5 | -0.94 |
2 | 163 | 0.060 987 | 0.001 095 | 0.282 767±0.000 027 | 689 | 1 001 | -0.17 | 3.3 | -0.97 | |
3 | 156 | 0.062 784 | 0.001 091 | 0.282 756±0.000 028 | 704 | 1 030 | -0.56 | 2.8 | -0.97 | |
4 | 156 | 0.182 452 | 0.003 059 | 0.282 920±0.000 030 | 498 | 672 | 5.23 | 8.3 | -0.91 | |
5 | 157 | 0.072 200 | 0.001 255 | 0.282 796±0.000 028 | 651 | 941 | 0.85 | 4.2 | -0.96 | |
6 | 161 | 0.057 827 | 0.000 992 | 0.282 750±0.000 026 | 711 | 1 040 | -0.77 | 2.7 | -0.97 | |
7 | 159 | 0.078 144 | 0.001 339 | 0.282 747±0.000 022 | 722 | 1 050 | -0.88 | 2.5 | -0.96 | |
8 | 158 | 0.120 985 | 0.002 093 | 0.282 705±0.000 030 | 798 | 1 150 | -2.36 | 0.9 | -0.94 | |
9 | 157 | 0.097 548 | 0.001 693 | 0.282 765±0.000 026 | 703 | 1 013 | -0.23 | 3.0 | -0.95 | |
10 | 157 | 0.096 685 | 0.001 687 | 0.282 779±0.000 025 | 683 | 982 | 0.24 | 3.5 | -0.95 | |
11 | 156 | 0.123 280 | 0.002 153 | 0.282 797±0.000 028 | 665 | 944 | 0.90 | 4.1 | -0.94 | |
12 | 158 | 0.180 122 | 0.002 940 | 0.282 838±0.000 029 | 618 | 855 | 2.35 | 5.5 | -0.91 | |
13 | 160 | 0.094 577 | 0.001 638 | 0.282 774±0.000 023 | 688 | 990 | 0.09 | 3.4 | -0.95 | |
14 | 158 | 0.161 252 | 0.002 711 | 0.282 810±0.000 030 | 656 | 918 | 1.35 | 4.5 | -0.92 | |
16 | 160 | 0.070 054 | 0.001 240 | 0.282 789±0.000 025 | 661 | 955 | 0.60 | 4.0 | -0.96 | |
17 | 157 | 0.091 408 | 0.001 603 | 0.282 786±0.000 026 | 671 | 965 | 0.50 | 3.8 | -0.95 | |
样品及 分析点号 | 年龄/Ma | 176Yb/ 177Hf | 176Lu/ 177Hf | 176Hf/177Hf±2σ | TDM /Ma | /Ma | εHf(0) | εHf(t) | ||
WJC-2 (王姜 冲岩体) | 18 | 159 | 0.085 027 | 0.001 567 | 0.282 782±0.000 027 | 676 | 973 | 0.35 | 3.7 | -0.95 |
19 | 161 | 0.093 584 | 0.001 698 | 0.282 809±0.000 030 | 640 | 912 | 1.31 | 4.7 | -0.95 | |
20 | 166 | 0.093 402 | 0.001 684 | 0.282 729±0.000 025 | 755 | 1 090 | -1.52 | 1.9 | -0.95 | |
21 | 157 | 0.059 336 | 0.001 064 | 0.282 810±0.000 023 | 628 | 908 | 1.34 | 4.7 | -0.97 | |
22 | 160 | 0.102 317 | 0.001 782 | 0.282 715±0.000 028 | 777 | 1 125 | -2.01 | 1.3 | -0.95 | |
23 | 167 | 0.043 941 | 0.000 816 | 0.282 694±0.000 027 | 787 | 1 163 | -2.77 | 0.8 | -0.98 | |
24 | 161 | 0.126 266 | 0.002 223 | 0.282 853±0.000 029 | 585 | 817 | 2.85 | 6.2 | -0.93 | |
25 | 159 | 0.089 278 | 0.001 601 | 0.282 788±0.000 024 | 668 | 960 | 0.56 | 3.9 | -0.95 | |
26 | 162 | 0.091 475 | 0.001 675 | 0.282 766±0.000 027 | 701 | 1 008 | -0.20 | 3.2 | -0.95 | |
27 | 158 | 0.128 285 | 0.002 316 | 0.282 805±0.000 025 | 657 | 928 | 1.15 | 4.4 | -0.93 | |
28 | 156 | 0.079 977 | 0.001 469 | 0.282 719±0.000 026 | 765 | 1 117 | -1.88 | 1.4 | -0.96 | |
29 | 161 | 0.135 838 | 0.002 402 | 0.282 823±0.000 028 | 631 | 884 | 1.82 | 5.1 | -0.93 | |
30 | 159 | 0.128 861 | 0.002 305 | 0.282 749±0.000 030 | 738 | 1 053 | -0.82 | 2.4 | -0.93 |
表3 古罗和王姜冲辉长岩样品LA-MC-ICP-MS锆石Lu-Hf同位素分析结果
Table 3 LA-MC-ICP-MS zircon Lu-Hf isotope data of gabbro samples from the Guluo and Wangjiangchong
样品及 分析点号 | 年龄/Ma | 176Yb/ 177Hf | 176Lu/ 177Hf | 176Hf/177Hf±2σ | TDM /Ma | /Ma | εHf(0) | εHf(t) | ||
---|---|---|---|---|---|---|---|---|---|---|
GL-1 (古罗岩体) | 1 | 165 | 0.090 269 | 0.001 619 | 0.282 756±0.000 027 | 714 | 1 028 | -0.55 | 2.9 | -0.96 |
2 | 176 | 0.076 848 | 0.001 362 | 0.282 822±0.000 030 | 615 | 871 | 1.77 | 5.5 | -0.95 | |
3 | 165 | 0.093 650 | 0.001 705 | 0.282 830±0.000 026 | 609 | 862 | 2.05 | 5.5 | -0.98 | |
4 | 165 | 0.030 093 | 0.000 560 | 0.282 723±0.000 027 | 741 | 1 097 | -1.74 | 1.8 | -0.96 | |
5 | 164 | 0.071 446 | 0.001 235 | 0.282 817±0.000 025 | 620 | 889 | 1.59 | 5.1 | -0.93 | |
6 | 165 | 0.132 881 | 0.002 177 | 0.282 841±0.000 030 | 601 | 840 | 2.44 | 5.8 | -0.95 | |
7 | 160 | 0.094 543 | 0.001 611 | 0.282 837±0.000 023 | 597 | 848 | 2.31 | 5.7 | -0.96 | |
8 | 162 | 0.079 647 | 0.001 325 | 0.282 821±0.000 026 | 617 | 882 | 1.72 | 5.1 | -0.97 | |
9 | 163 | 0.060 721 | 0.001 059 | 0.282 693±0.000 026 | 793 | 1 168 | -2.78 | 0.7 | -0.95 | |
10 | 164 | 0.089 598 | 0.001 512 | 0.282 762±0.000 027 | 704 | 1 015 | -0.36 | 3.1 | -0.93 | |
11 | 161 | 0.135 710 | 0.002 228 | 0.282 873±0.000 028 | 556 | 771 | 3.56 | 6.9 | -0.95 | |
12 | 163 | 0.098 089 | 0.001 644 | 0.282 773±0.000 024 | 691 | 993 | 0.02 | 3.4 | -0.96 | |
13 | 162 | 0.072 985 | 0.001 324 | 0.282 746±0.000 022 | 723 | 1 050 | -0.91 | 2.5 | -0.94 | |
15 | 164 | 0.110 921 | 0.001 891 | 0.282 841±0.000 026 | 597 | 840 | 2.42 | 5.8 | -0.95 | |
16 | 161 | 0.090 756 | 0.001 517 | 0.282 769±0.000 027 | 694 | 1 001 | -0.11 | 3.3 | -0.97 | |
17 | 169 | 0.058 462 | 0.001 007 | 0.282 751±0.000 026 | 710 | 1 034 | -0.75 | 2.9 | -0.94 | |
18 | 163 | 0.108 347 | 0.001 835 | 0.282 893±0.000 027 | 521 | 722 | 4.27 | 7.7 | -0.96 | |
20 | 164 | 0.070 769 | 0.001 247 | 0.282 795±0.000 025 | 651 | 938 | 0.83 | 4.3 | -0.94 | |
21 | 165 | 0.114 290 | 0.001 901 | 0.282 836±0.000 024 | 604 | 850 | 2.27 | 5.7 | -0.95 | |
22 | 165 | 0.093 102 | 0.001 675 | 0.282 774±0.000 023 | 690 | 989 | 0.07 | 3.5 | -0.94 | |
23 | 161 | 0.121 754 | 0.002 080 | 0.282 777±0.000 029 | 693 | 987 | 0.18 | 3.5 | -0.93 | |
24 | 162 | 0.135 761 | 0.002 356 | 0.282 886±0.000 026 | 538 | 741 | 4.04 | 7.3 | -0.94 | |
25 | 162 | 0.106 936 | 0.001 850 | 0.282 757±0.000 029 | 718 | 1 031 | -0.55 | 2.8 | -0.98 | |
26 | 166 | 0.034 608 | 0.000 645 | 0.282 742±0.000 022 | 717 | 1 054 | -1.08 | 2.5 | -0.97 | |
27 | 164 | 0.048 099 | 0.000 851 | 0.282 717±0.000 026 | 755 | 1 113 | -1.96 | 1.6 | -0.96 | |
28 | 166 | 0.079 346 | 0.001 421 | 0.282 824±0.000 024 | 613 | 872 | 1.85 | 5.3 | -0.96 | |
29 | 164 | 0.079 920 | 0.001 368 | 0.282 821±0.000 023 | 618 | 882 | 1.72 | 5.2 | -0.94 | |
30 | 166 | 0.122 002 | 0.002 123 | 0.282 821±0.000 027 | 629 | 884 | 1.74 | 5.2 | -0.96 | |
WJC-2 (王姜 冲岩体) | 1 | 158 | 0.122 478 | 0.002 081 | 0.282 863±0.000 028 | 568 | 794 | 3.21 | 6.5 | -0.94 |
2 | 163 | 0.060 987 | 0.001 095 | 0.282 767±0.000 027 | 689 | 1 001 | -0.17 | 3.3 | -0.97 | |
3 | 156 | 0.062 784 | 0.001 091 | 0.282 756±0.000 028 | 704 | 1 030 | -0.56 | 2.8 | -0.97 | |
4 | 156 | 0.182 452 | 0.003 059 | 0.282 920±0.000 030 | 498 | 672 | 5.23 | 8.3 | -0.91 | |
5 | 157 | 0.072 200 | 0.001 255 | 0.282 796±0.000 028 | 651 | 941 | 0.85 | 4.2 | -0.96 | |
6 | 161 | 0.057 827 | 0.000 992 | 0.282 750±0.000 026 | 711 | 1 040 | -0.77 | 2.7 | -0.97 | |
7 | 159 | 0.078 144 | 0.001 339 | 0.282 747±0.000 022 | 722 | 1 050 | -0.88 | 2.5 | -0.96 | |
8 | 158 | 0.120 985 | 0.002 093 | 0.282 705±0.000 030 | 798 | 1 150 | -2.36 | 0.9 | -0.94 | |
9 | 157 | 0.097 548 | 0.001 693 | 0.282 765±0.000 026 | 703 | 1 013 | -0.23 | 3.0 | -0.95 | |
10 | 157 | 0.096 685 | 0.001 687 | 0.282 779±0.000 025 | 683 | 982 | 0.24 | 3.5 | -0.95 | |
11 | 156 | 0.123 280 | 0.002 153 | 0.282 797±0.000 028 | 665 | 944 | 0.90 | 4.1 | -0.94 | |
12 | 158 | 0.180 122 | 0.002 940 | 0.282 838±0.000 029 | 618 | 855 | 2.35 | 5.5 | -0.91 | |
13 | 160 | 0.094 577 | 0.001 638 | 0.282 774±0.000 023 | 688 | 990 | 0.09 | 3.4 | -0.95 | |
14 | 158 | 0.161 252 | 0.002 711 | 0.282 810±0.000 030 | 656 | 918 | 1.35 | 4.5 | -0.92 | |
16 | 160 | 0.070 054 | 0.001 240 | 0.282 789±0.000 025 | 661 | 955 | 0.60 | 4.0 | -0.96 | |
17 | 157 | 0.091 408 | 0.001 603 | 0.282 786±0.000 026 | 671 | 965 | 0.50 | 3.8 | -0.95 | |
样品及 分析点号 | 年龄/Ma | 176Yb/ 177Hf | 176Lu/ 177Hf | 176Hf/177Hf±2σ | TDM /Ma | /Ma | εHf(0) | εHf(t) | ||
WJC-2 (王姜 冲岩体) | 18 | 159 | 0.085 027 | 0.001 567 | 0.282 782±0.000 027 | 676 | 973 | 0.35 | 3.7 | -0.95 |
19 | 161 | 0.093 584 | 0.001 698 | 0.282 809±0.000 030 | 640 | 912 | 1.31 | 4.7 | -0.95 | |
20 | 166 | 0.093 402 | 0.001 684 | 0.282 729±0.000 025 | 755 | 1 090 | -1.52 | 1.9 | -0.95 | |
21 | 157 | 0.059 336 | 0.001 064 | 0.282 810±0.000 023 | 628 | 908 | 1.34 | 4.7 | -0.97 | |
22 | 160 | 0.102 317 | 0.001 782 | 0.282 715±0.000 028 | 777 | 1 125 | -2.01 | 1.3 | -0.95 | |
23 | 167 | 0.043 941 | 0.000 816 | 0.282 694±0.000 027 | 787 | 1 163 | -2.77 | 0.8 | -0.98 | |
24 | 161 | 0.126 266 | 0.002 223 | 0.282 853±0.000 029 | 585 | 817 | 2.85 | 6.2 | -0.93 | |
25 | 159 | 0.089 278 | 0.001 601 | 0.282 788±0.000 024 | 668 | 960 | 0.56 | 3.9 | -0.95 | |
26 | 162 | 0.091 475 | 0.001 675 | 0.282 766±0.000 027 | 701 | 1 008 | -0.20 | 3.2 | -0.95 | |
27 | 158 | 0.128 285 | 0.002 316 | 0.282 805±0.000 025 | 657 | 928 | 1.15 | 4.4 | -0.93 | |
28 | 156 | 0.079 977 | 0.001 469 | 0.282 719±0.000 026 | 765 | 1 117 | -1.88 | 1.4 | -0.96 | |
29 | 161 | 0.135 838 | 0.002 402 | 0.282 823±0.000 028 | 631 | 884 | 1.82 | 5.1 | -0.93 | |
30 | 159 | 0.128 861 | 0.002 305 | 0.282 749±0.000 030 | 738 | 1 053 | -0.82 | 2.4 | -0.93 |
图8 古罗和王姜冲辉长岩Nb/Yb-Th/Yb((a),底图据文献[43])和La/Yb-Sm/Yb图解((b), 底图据文献[44]) OIB.洋岛玄武岩;E-MORB.富集型洋中脊玄武岩;N-MORB.正常型洋中脊玄武岩
Fig.8 Nb/Yb vs.Th/Yb ((a),base map after reference [43]) and La/Yb vs. Sm/Yb ((b),base map after reference [44])diagrams for the Guluo and Wangjiangchong gabbros
图9 辉长岩样品2Nb-Zr/4-Y图解((a),底图据文献[53] )和Hf/3-Th-Ta图解((b),底图据文献[54] ) A1.WPAB;A2.WPAB+WPT;B.E-MORB;C.WPT+VAB;D.N-MORE+VAB。IAT.岛弧拉斑玄武岩;CAB.火山弧钙碱性玄武岩;N-MORB.正常型洋中脊玄武岩;E-MORB.富集型洋中脊玄武岩;WPAB.板内碱性玄武岩;WPT.板内拉斑玄武岩
Fig.9 Ternary 2Nb-Zr/4-Y((a),base map after reference [53]) and Hf/3-Th-Ta((b),base map after reference [54]) tectonic discrimination diagrams for the gabbro samples
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