现代地质 ›› 2023, Vol. 37 ›› Issue (02): 375-389.DOI: 10.19657/j.geoscience.1000-8527.2022.027
邓科1(), 王金贵2(
), 董玉杰1, 何林武1, 袁仁华1, 张泽国1, 陈守关1, 辛堂1
收稿日期:
2021-04-07
修回日期:
2022-03-21
出版日期:
2023-04-10
发布日期:
2023-05-23
通讯作者:
王金贵
作者简介:
王金贵,男,高级工程师,1986年出生,构造地质学专业,主要从事区域地质调查与研究工作。Email:airstarry@163.com。基金资助:
DENG Ke1(), WANG Jingui2(
), DONG Yujie1, HE Linwu1, YUAN Renhua1, ZHANG Zeguo1, CHEN Shouguan1, XIN Tang1
Received:
2021-04-07
Revised:
2022-03-21
Online:
2023-04-10
Published:
2023-05-23
Contact:
WANG Jingui
摘要:
冈底斯岩浆岩带呈近东西向沿雅鲁藏布江缝合带分布,是一条巨大的构造—岩浆岩带。南冈底斯中生代的岩浆活动经历了205~152 Ma、109~80 Ma、65~41 Ma和33~13 Ma 4个阶段,均是挤压环境的产物。但其触发机制一直存在争议。争议的焦点在于新特提斯洋和班公湖—怒江洋的俯冲方式。为解释冈底斯南缘中生代中酸性岩浆岩的成因及构造环境,本文以西藏自治区扎囊县桑耶地区的石英二长岩为研究对象,通过年代学、岩石地球化学、Lu-Hf同位素分析岩浆起源、岩石成因及其构造环境。LA-ICP-MS锆石U-Pb定年结果显示,岩体形成于晚白垩世(91~88 Ma)。岩石地球化学分析揭示其属准铝质高钾钙碱性系列,富集大离子亲石元素和轻稀土元素,亏损高场强元素和重稀土元素,无明显Eu负异常,锆石εHf(t)值为+10.6~+14.2。石英二长岩形成于斜长石和石榴石的过渡带,岩浆经历了角闪石、磷灰石及黑云母的分离结晶作用。其典型的微量元素比值特征指示岩浆来源于年轻俯冲洋壳的部分熔融,并有少量新生幔源物质加入,具典型的I型花岗岩特征,推断其形成于俯冲岛弧环境,表明晚白垩世时期冈底斯南缘处于新特提斯板块向北俯冲的构造背景之下。
中图分类号:
邓科, 王金贵, 董玉杰, 何林武, 袁仁华, 张泽国, 陈守关, 辛堂. 西藏桑耶地区晚白垩世中性侵入岩的成因及对新特提斯板块北向俯冲的指示意义[J]. 现代地质, 2023, 37(02): 375-389.
DENG Ke, WANG Jingui, DONG Yujie, HE Linwu, YUAN Renhua, ZHANG Zeguo, CHEN Shouguan, XIN Tang. Genesis and Geological Significance of Late Cretaceous Intermediate Intrusions in Sangye, Tibet[J]. Geoscience, 2023, 37(02): 375-389.
图1 冈底斯岩浆岩分布图(a)和研究区地质图(b)(据Zhu等[16]) 1. 晚全新世冲洪积物; 2. 中三叠统昌果组二段;3. 中三叠统昌果组一段; 4. 晚白垩世石英闪长岩;5. 晚白垩世二长岩、石英二长岩;6. 晚白垩世二长花岗岩;7. 晚白垩世花岗闪长岩;8. 测年样品位置;BNSZ.班公湖—怒江缝合带;LMF.洛巴堆—米拉山断裂带
Fig.1 Distribution of the Gangdese magmatic belt (a) and geological map of the study area (b) (after Zhu et al[16])
图2 西藏桑耶地区晚白垩世石英二长岩野外及镜下显微照片 (a)(b) 野外宏观产出照片;(c)(d) 石英二长岩的镜下照片(正交偏光);Pl.斜长石;Kf.钾长石;Hb.角闪石;Qtz.石英
Fig.2 Field and microscopic photographs of the Late Cretaceous quartz monzonite in Sangye area, Tibet
测点号 | wB(10-6) | Th/U | 同位素比值 | 年龄(Ma) | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Pb | Th | U | 207Pb/ 206Pb | ±1σ | 207Pb/ 235U | ±1σ | 206Pb/ 238U | ±1σ | 207Pb/ 235U | ±1σ | 206Pb/ 238U | ±1σ | ||||
PM20-2 | 2.78 | 193.44 | 140.09 | 1.38 | 0.0507 | 0.0035 | 0.0974 | 0.0069 | 0.0140 | 0.00024 | 94.36 | 6.36 | 89.89 | 1.50 | ||
PM20-3 | 1.85 | 112.68 | 103.95 | 1.08 | 0.0515 | 0.0054 | 0.0949 | 0.0098 | 0.0134 | 0.00031 | 92.10 | 9.12 | 86.10 | 2.00 | ||
PM20-4 | 2.63 | 179.33 | 134.17 | 1.34 | 0.0555 | 0.0038 | 0.1026 | 0.0067 | 0.0138 | 0.00025 | 99.17 | 6.14 | 88.17 | 1.60 | ||
PM20-5 | 2.19 | 142.37 | 121.19 | 1.17 | 0.0502 | 0.0044 | 0.0911 | 0.0077 | 0.0137 | 0.00042 | 88.55 | 7.18 | 87.69 | 2.68 | ||
PM20-6 | 2.84 | 200.38 | 145.30 | 1.38 | 0.0477 | 0.0048 | 0.0908 | 0.0102 | 0.0135 | 0.00031 | 88.25 | 9.45 | 86.34 | 1.99 | ||
PM20-7 | 2.93 | 199.68 | 147.58 | 1.35 | 0.0475 | 0.0039 | 0.0897 | 0.0074 | 0.0138 | 0.00025 | 87.18 | 6.93 | 88.10 | 1.59 | ||
PM20-8 | 2.22 | 131.00 | 116.84 | 1.12 | 0.0539 | 0.0043 | 0.0978 | 0.0072 | 0.0138 | 0.00032 | 94.74 | 6.62 | 88.28 | 2.04 | ||
PM20-9 | 2.34 | 157.27 | 125.17 | 1.26 | 0.0499 | 0.0050 | 0.0877 | 0.0080 | 0.0133 | 0.00031 | 85.33 | 7.47 | 85.34 | 2.00 | ||
PM20-10 | 1.65 | 82.18 | 93.48 | 0.88 | 0.0506 | 0.0047 | 0.0910 | 0.0076 | 0.0137 | 0.00033 | 88.47 | 7.09 | 87.71 | 2.13 | ||
PM20-11 | 2.97 | 202.83 | 150.93 | 1.34 | 0.0477 | 0.0033 | 0.0905 | 0.0065 | 0.0138 | 0.00027 | 87.94 | 6.09 | 88.06 | 1.74 | ||
PM20-13 | 2.62 | 138.21 | 142.45 | 0.97 | 0.0460 | 0.0042 | 0.0868 | 0.0077 | 0.0139 | 0.00031 | 84.53 | 7.24 | 88.98 | 2.00 | ||
PM20-15 | 2.80 | 196.74 | 144.21 | 1.36 | 0.0524 | 0.0059 | 0.0965 | 0.0104 | 0.0135 | 0.00033 | 93.59 | 9.63 | 86.31 | 2.07 | ||
PM20-16 | 3.71 | 257.38 | 190.42 | 1.35 | 0.0524 | 0.0041 | 0.1017 | 0.0078 | 0.0141 | 0.00026 | 98.32 | 7.18 | 90.47 | 1.68 | ||
PM20-17 | 3.30 | 228.79 | 168.25 | 1.36 | 0.0529 | 0.0037 | 0.0989 | 0.0068 | 0.0138 | 0.00026 | 95.73 | 6.25 | 88.31 | 1.66 | ||
PM20-18 | 2.72 | 176.74 | 142.19 | 1.24 | 0.0498 | 0.0042 | 0.0929 | 0.0074 | 0.0140 | 0.00044 | 90.19 | 6.91 | 89.87 | 2.80 | ||
PM20-21 | 3.19 | 214.30 | 164.84 | 1.30 | 0.0533 | 0.0040 | 0.0993 | 0.0072 | 0.0139 | 0.00024 | 96.15 | 6.69 | 88.93 | 1.50 | ||
PM20-23 | 2.58 | 172.68 | 134.71 | 1.28 | 0.0505 | 0.0039 | 0.0938 | 0.0067 | 0.0138 | 0.00029 | 91.00 | 6.19 | 88.59 | 1.85 | ||
PM20-24 | 1.82 | 94.76 | 96.28 | 0.98 | 0.0516 | 0.0064 | 0.1003 | 0.0130 | 0.0141 | 0.00037 | 97.06 | 11.95 | 90.01 | 2.33 | ||
PM20-25 | 2.24 | 145.18 | 124.39 | 1.17 | 0.0511 | 0.0060 | 0.0930 | 0.0101 | 0.0134 | 0.00036 | 90.32 | 9.38 | 86.01 | 2.32 | ||
PM06-1 | 3.10 | 158.02 | 156.18 | 1.01 | 0.0448 | 0.0040 | 0.0879 | 0.0074 | 0.0148 | 0.00043 | 85.57 | 6.91 | 94.77 | 2.71 | ||
PM06-3 | 3.91 | 191.79 | 194.27 | 0.99 | 0.0490 | 0.0051 | 0.0904 | 0.0087 | 0.0137 | 0.00030 | 87.88 | 8.08 | 87.65 | 1.88 | ||
PM06-4 | 19.87 | 135.53 | 1318.74 | 0.10 | 0.0505 | 0.0025 | 0.0931 | 0.0043 | 0.0135 | 0.00022 | 90.40 | 4.03 | 86.47 | 1.42 | ||
PM06-5 | 2.60 | 119.40 | 129.67 | 0.92 | 0.0582 | 0.0058 | 0.1078 | 0.0093 | 0.0138 | 0.00038 | 103.91 | 8.54 | 88.37 | 2.44 | ||
PM06-6 | 4.48 | 237.46 | 211.82 | 1.12 | 0.0394 | 0.0088 | 0.0770 | 0.0160 | 0.0145 | 0.00046 | 75.36 | 15.05 | 93.03 | 2.94 | ||
PM06-9 | 3.96 | 162.09 | 183.94 | 0.88 | 0.0647 | 0.0069 | 0.1222 | 0.0126 | 0.0145 | 0.00042 | 117.07 | 11.36 | 92.86 | 2.68 | ||
PM06-10 | 2.45 | 103.61 | 112.43 | 0.92 | 0.0553 | 0.0070 | 0.1131 | 0.0145 | 0.0148 | 0.00049 | 108.78 | 13.24 | 94.45 | 3.09 | ||
PM06-12 | 2.93 | 133.39 | 136.40 | 0.98 | 0.0686 | 0.0053 | 0.1328 | 0.0095 | 0.0150 | 0.00046 | 126.61 | 8.50 | 96.09 | 2.94 | ||
PM06-15 | 4.90 | 246.13 | 220.04 | 1.12 | 0.0550 | 0.0049 | 0.1081 | 0.0094 | 0.0147 | 0.00038 | 104.23 | 8.60 | 94.08 | 2.43 | ||
PM06-16 | 2.39 | 111.39 | 104.36 | 1.07 | 0.0494 | 0.0093 | 0.0943 | 0.0156 | 0.0151 | 0.00061 | 91.52 | 14.48 | 96.69 | 3.88 | ||
PM06-17 | 4.05 | 158.08 | 199.89 | 0.79 | 0.0586 | 0.0049 | 0.1124 | 0.0080 | 0.0144 | 0.00039 | 108.18 | 7.34 | 92.03 | 2.48 | ||
PM06-18 | 2.25 | 100.52 | 100.52 | 1.00 | 0.0567 | 0.0058 | 0.1148 | 0.0106 | 0.0150 | 0.00043 | 110.36 | 9.70 | 96.26 | 2.72 | ||
PM06-19 | 3.72 | 167.03 | 173.58 | 0.96 | 0.0664 | 0.0056 | 0.1229 | 0.0106 | 0.0142 | 0.00034 | 117.71 | 9.61 | 91.03 | 2.18 | ||
PM06-20 | 2.54 | 113.78 | 121.06 | 0.94 | 0.0456 | 0.0046 | 0.0879 | 0.0088 | 0.0143 | 0.00037 | 85.58 | 8.17 | 91.67 | 2.35 |
表1 西藏桑耶地区晚白垩世石英二长岩LA-ICP-MS锆石U-Pb定年结果
Table 1 LA-ICP-MS zircon U-Pb dating results for the Late Cretaceous quartz monzonite in Sangye area, Tibet
测点号 | wB(10-6) | Th/U | 同位素比值 | 年龄(Ma) | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Pb | Th | U | 207Pb/ 206Pb | ±1σ | 207Pb/ 235U | ±1σ | 206Pb/ 238U | ±1σ | 207Pb/ 235U | ±1σ | 206Pb/ 238U | ±1σ | ||||
PM20-2 | 2.78 | 193.44 | 140.09 | 1.38 | 0.0507 | 0.0035 | 0.0974 | 0.0069 | 0.0140 | 0.00024 | 94.36 | 6.36 | 89.89 | 1.50 | ||
PM20-3 | 1.85 | 112.68 | 103.95 | 1.08 | 0.0515 | 0.0054 | 0.0949 | 0.0098 | 0.0134 | 0.00031 | 92.10 | 9.12 | 86.10 | 2.00 | ||
PM20-4 | 2.63 | 179.33 | 134.17 | 1.34 | 0.0555 | 0.0038 | 0.1026 | 0.0067 | 0.0138 | 0.00025 | 99.17 | 6.14 | 88.17 | 1.60 | ||
PM20-5 | 2.19 | 142.37 | 121.19 | 1.17 | 0.0502 | 0.0044 | 0.0911 | 0.0077 | 0.0137 | 0.00042 | 88.55 | 7.18 | 87.69 | 2.68 | ||
PM20-6 | 2.84 | 200.38 | 145.30 | 1.38 | 0.0477 | 0.0048 | 0.0908 | 0.0102 | 0.0135 | 0.00031 | 88.25 | 9.45 | 86.34 | 1.99 | ||
PM20-7 | 2.93 | 199.68 | 147.58 | 1.35 | 0.0475 | 0.0039 | 0.0897 | 0.0074 | 0.0138 | 0.00025 | 87.18 | 6.93 | 88.10 | 1.59 | ||
PM20-8 | 2.22 | 131.00 | 116.84 | 1.12 | 0.0539 | 0.0043 | 0.0978 | 0.0072 | 0.0138 | 0.00032 | 94.74 | 6.62 | 88.28 | 2.04 | ||
PM20-9 | 2.34 | 157.27 | 125.17 | 1.26 | 0.0499 | 0.0050 | 0.0877 | 0.0080 | 0.0133 | 0.00031 | 85.33 | 7.47 | 85.34 | 2.00 | ||
PM20-10 | 1.65 | 82.18 | 93.48 | 0.88 | 0.0506 | 0.0047 | 0.0910 | 0.0076 | 0.0137 | 0.00033 | 88.47 | 7.09 | 87.71 | 2.13 | ||
PM20-11 | 2.97 | 202.83 | 150.93 | 1.34 | 0.0477 | 0.0033 | 0.0905 | 0.0065 | 0.0138 | 0.00027 | 87.94 | 6.09 | 88.06 | 1.74 | ||
PM20-13 | 2.62 | 138.21 | 142.45 | 0.97 | 0.0460 | 0.0042 | 0.0868 | 0.0077 | 0.0139 | 0.00031 | 84.53 | 7.24 | 88.98 | 2.00 | ||
PM20-15 | 2.80 | 196.74 | 144.21 | 1.36 | 0.0524 | 0.0059 | 0.0965 | 0.0104 | 0.0135 | 0.00033 | 93.59 | 9.63 | 86.31 | 2.07 | ||
PM20-16 | 3.71 | 257.38 | 190.42 | 1.35 | 0.0524 | 0.0041 | 0.1017 | 0.0078 | 0.0141 | 0.00026 | 98.32 | 7.18 | 90.47 | 1.68 | ||
PM20-17 | 3.30 | 228.79 | 168.25 | 1.36 | 0.0529 | 0.0037 | 0.0989 | 0.0068 | 0.0138 | 0.00026 | 95.73 | 6.25 | 88.31 | 1.66 | ||
PM20-18 | 2.72 | 176.74 | 142.19 | 1.24 | 0.0498 | 0.0042 | 0.0929 | 0.0074 | 0.0140 | 0.00044 | 90.19 | 6.91 | 89.87 | 2.80 | ||
PM20-21 | 3.19 | 214.30 | 164.84 | 1.30 | 0.0533 | 0.0040 | 0.0993 | 0.0072 | 0.0139 | 0.00024 | 96.15 | 6.69 | 88.93 | 1.50 | ||
PM20-23 | 2.58 | 172.68 | 134.71 | 1.28 | 0.0505 | 0.0039 | 0.0938 | 0.0067 | 0.0138 | 0.00029 | 91.00 | 6.19 | 88.59 | 1.85 | ||
PM20-24 | 1.82 | 94.76 | 96.28 | 0.98 | 0.0516 | 0.0064 | 0.1003 | 0.0130 | 0.0141 | 0.00037 | 97.06 | 11.95 | 90.01 | 2.33 | ||
PM20-25 | 2.24 | 145.18 | 124.39 | 1.17 | 0.0511 | 0.0060 | 0.0930 | 0.0101 | 0.0134 | 0.00036 | 90.32 | 9.38 | 86.01 | 2.32 | ||
PM06-1 | 3.10 | 158.02 | 156.18 | 1.01 | 0.0448 | 0.0040 | 0.0879 | 0.0074 | 0.0148 | 0.00043 | 85.57 | 6.91 | 94.77 | 2.71 | ||
PM06-3 | 3.91 | 191.79 | 194.27 | 0.99 | 0.0490 | 0.0051 | 0.0904 | 0.0087 | 0.0137 | 0.00030 | 87.88 | 8.08 | 87.65 | 1.88 | ||
PM06-4 | 19.87 | 135.53 | 1318.74 | 0.10 | 0.0505 | 0.0025 | 0.0931 | 0.0043 | 0.0135 | 0.00022 | 90.40 | 4.03 | 86.47 | 1.42 | ||
PM06-5 | 2.60 | 119.40 | 129.67 | 0.92 | 0.0582 | 0.0058 | 0.1078 | 0.0093 | 0.0138 | 0.00038 | 103.91 | 8.54 | 88.37 | 2.44 | ||
PM06-6 | 4.48 | 237.46 | 211.82 | 1.12 | 0.0394 | 0.0088 | 0.0770 | 0.0160 | 0.0145 | 0.00046 | 75.36 | 15.05 | 93.03 | 2.94 | ||
PM06-9 | 3.96 | 162.09 | 183.94 | 0.88 | 0.0647 | 0.0069 | 0.1222 | 0.0126 | 0.0145 | 0.00042 | 117.07 | 11.36 | 92.86 | 2.68 | ||
PM06-10 | 2.45 | 103.61 | 112.43 | 0.92 | 0.0553 | 0.0070 | 0.1131 | 0.0145 | 0.0148 | 0.00049 | 108.78 | 13.24 | 94.45 | 3.09 | ||
PM06-12 | 2.93 | 133.39 | 136.40 | 0.98 | 0.0686 | 0.0053 | 0.1328 | 0.0095 | 0.0150 | 0.00046 | 126.61 | 8.50 | 96.09 | 2.94 | ||
PM06-15 | 4.90 | 246.13 | 220.04 | 1.12 | 0.0550 | 0.0049 | 0.1081 | 0.0094 | 0.0147 | 0.00038 | 104.23 | 8.60 | 94.08 | 2.43 | ||
PM06-16 | 2.39 | 111.39 | 104.36 | 1.07 | 0.0494 | 0.0093 | 0.0943 | 0.0156 | 0.0151 | 0.00061 | 91.52 | 14.48 | 96.69 | 3.88 | ||
PM06-17 | 4.05 | 158.08 | 199.89 | 0.79 | 0.0586 | 0.0049 | 0.1124 | 0.0080 | 0.0144 | 0.00039 | 108.18 | 7.34 | 92.03 | 2.48 | ||
PM06-18 | 2.25 | 100.52 | 100.52 | 1.00 | 0.0567 | 0.0058 | 0.1148 | 0.0106 | 0.0150 | 0.00043 | 110.36 | 9.70 | 96.26 | 2.72 | ||
PM06-19 | 3.72 | 167.03 | 173.58 | 0.96 | 0.0664 | 0.0056 | 0.1229 | 0.0106 | 0.0142 | 0.00034 | 117.71 | 9.61 | 91.03 | 2.18 | ||
PM06-20 | 2.54 | 113.78 | 121.06 | 0.94 | 0.0456 | 0.0046 | 0.0879 | 0.0088 | 0.0143 | 0.00037 | 85.58 | 8.17 | 91.67 | 2.35 |
测点号 | 年龄(Ma) | 176Yb/177Hf | 2σ | 176Lu/177Hf | 2σ | 176Hf/177Hf | 2σ | εHf(t) | tDM1(Ma) | tDM2(Ma) | fLu/Hf |
---|---|---|---|---|---|---|---|---|---|---|---|
PM20-3 | 86.1 | 0.010741 | 0.000065 | 0.000399 | 0.000002 | 0.283065 | 0.000019 | 12.2 | 260.9 | 369.9 | -0.99 |
PM20-5 | 87.69 | 0.022749 | 0.000103 | 0.000808 | 0.000006 | 0.283082 | 0.000021 | 12.9 | 238.6 | 330.1 | -0.98 |
PM20-6 | 86.34 | 0.019553 | 0.000423 | 0.000691 | 0.000015 | 0.283063 | 0.000024 | 12.1 | 265.5 | 375.0 | -0.98 |
PM20-7 | 88.1 | 0.017383 | 0.000174 | 0.000626 | 0.000007 | 0.283064 | 0.000019 | 12.2 | 263.7 | 371.6 | -0.98 |
PM20-9 | 85.34 | 0.020284 | 0.000243 | 0.000704 | 0.000006 | 0.283039 | 0.000021 | 11.3 | 298.7 | 429.1 | -0.98 |
PM20-10 | 87.71 | 0.010057 | 0.000083 | 0.000363 | 0.000002 | 0.283060 | 0.000021 | 12.1 | 266.6 | 378.5 | -0.99 |
PM20-11 | 88.06 | 0.018632 | 0.000160 | 0.000640 | 0.000004 | 0.283050 | 0.000027 | 11.7 | 282.8 | 402.3 | -0.98 |
PM20-13 | 88.98 | 0.018377 | 0.000138 | 0.000629 | 0.000005 | 0.283087 | 0.000023 | 13.1 | 230.9 | 318.0 | -0.98 |
PM20-16 | 90.47 | 0.023509 | 0.000081 | 0.000798 | 0.000003 | 0.283054 | 0.000024 | 11.9 | 279.0 | 393.5 | -0.98 |
PM20-17 | 88.31 | 0.021479 | 0.000068 | 0.000719 | 0.000001 | 0.283107 | 0.000020 | 13.8 | 202.8 | 272.7 | -0.98 |
PM20-18 | 89.87 | 0.017991 | 0.000141 | 0.000614 | 0.000003 | 0.283091 | 0.000022 | 13.2 | 225.8 | 309.4 | -0.98 |
PM20-20 | 96.22 | 0.016890 | 0.000319 | 0.000578 | 0.000008 | 0.283052 | 0.000021 | 12.0 | 280.7 | 394.3 | -0.98 |
PM20-21 | 88.93 | 0.022531 | 0.000212 | 0.000765 | 0.000004 | 0.283067 | 0.000020 | 12.3 | 260.4 | 364.8 | -0.98 |
PM20-23 | 88.59 | 0.015685 | 0.000091 | 0.000548 | 0.000003 | 0.283085 | 0.000023 | 13.0 | 233.6 | 323.2 | -0.98 |
PM20-24 | 90.01 | 0.018729 | 0.000170 | 0.000634 | 0.000007 | 0.283076 | 0.000018 | 12.7 | 247.0 | 343.4 | -0.98 |
PM06-1 | 94.77 | 0.012055 | 0.000218 | 0.000511 | 0.000009 | 0.283068 | 0.000020 | 12.5 | 257.5 | 358.2 | -0.98 |
PM06-3 | 87.65 | 0.011490 | 0.000252 | 0.000477 | 0.000010 | 0.283018 | 0.000022 | 10.6 | 326.5 | 474.8 | -0.99 |
PM06-4 | 86.47 | 0.015910 | 0.000215 | 0.000662 | 0.000010 | 0.283031 | 0.000023 | 11.0 | 309.8 | 446.6 | -0.98 |
PM06-5 | 88.37 | 0.014593 | 0.001343 | 0.000615 | 0.000053 | 0.283065 | 0.000020 | 12.3 | 261.7 | 368.3 | -0.98 |
PM06-6 | 93.03 | 0.011043 | 0.000074 | 0.000463 | 0.000002 | 0.283074 | 0.000022 | 12.7 | 248.4 | 344.9 | -0.99 |
PM06-9 | 92.86 | 0.016204 | 0.000207 | 0.000677 | 0.000009 | 0.283041 | 0.000023 | 11.5 | 296.8 | 421.7 | -0.98 |
PM06-10 | 94.45 | 0.017040 | 0.000535 | 0.000695 | 0.000023 | 0.283116 | 0.000024 | 14.2 | 190.8 | 249.7 | -0.98 |
PM06-12 | 96.09 | 0.013220 | 0.000072 | 0.000547 | 0.000004 | 0.283107 | 0.000029 | 13.9 | 202.4 | 268.1 | -0.98 |
PM06-15 | 94.08 | 0.011239 | 0.000117 | 0.000464 | 0.000003 | 0.283057 | 0.000023 | 12.1 | 271.6 | 381.9 | -0.99 |
PM06-16 | 96.69 | 0.014018 | 0.000190 | 0.000577 | 0.000007 | 0.283046 | 0.000019 | 11.8 | 287.9 | 405.8 | -0.98 |
PM06-17 | 92.03 | 0.011843 | 0.000122 | 0.000505 | 0.000005 | 0.283060 | 0.000022 | 12.2 | 268.6 | 378.0 | -0.98 |
PM06-18 | 96.26 | 0.015116 | 0.000276 | 0.000623 | 0.000010 | 0.283045 | 0.000020 | 11.7 | 290.6 | 410.0 | -0.98 |
PM06-19 | 91.03 | 0.010779 | 0.000319 | 0.000457 | 0.000013 | 0.283068 | 0.000019 | 12.4 | 257.3 | 360.6 | -0.99 |
PM06-20 | 91.67 | 0.009409 | 0.000130 | 0.000406 | 0.000006 | 0.283030 | 0.000022 | 11.1 | 309.2 | 444.9 | -0.99 |
表2 西藏桑耶地区晚白垩世石英二长岩锆石Lu-Hf同位素分析结果
Table 2 Zircon Lu-Hf isotopic analysis results for the Late Cretaceous quartz monzonite in Sangye area, Tibet
测点号 | 年龄(Ma) | 176Yb/177Hf | 2σ | 176Lu/177Hf | 2σ | 176Hf/177Hf | 2σ | εHf(t) | tDM1(Ma) | tDM2(Ma) | fLu/Hf |
---|---|---|---|---|---|---|---|---|---|---|---|
PM20-3 | 86.1 | 0.010741 | 0.000065 | 0.000399 | 0.000002 | 0.283065 | 0.000019 | 12.2 | 260.9 | 369.9 | -0.99 |
PM20-5 | 87.69 | 0.022749 | 0.000103 | 0.000808 | 0.000006 | 0.283082 | 0.000021 | 12.9 | 238.6 | 330.1 | -0.98 |
PM20-6 | 86.34 | 0.019553 | 0.000423 | 0.000691 | 0.000015 | 0.283063 | 0.000024 | 12.1 | 265.5 | 375.0 | -0.98 |
PM20-7 | 88.1 | 0.017383 | 0.000174 | 0.000626 | 0.000007 | 0.283064 | 0.000019 | 12.2 | 263.7 | 371.6 | -0.98 |
PM20-9 | 85.34 | 0.020284 | 0.000243 | 0.000704 | 0.000006 | 0.283039 | 0.000021 | 11.3 | 298.7 | 429.1 | -0.98 |
PM20-10 | 87.71 | 0.010057 | 0.000083 | 0.000363 | 0.000002 | 0.283060 | 0.000021 | 12.1 | 266.6 | 378.5 | -0.99 |
PM20-11 | 88.06 | 0.018632 | 0.000160 | 0.000640 | 0.000004 | 0.283050 | 0.000027 | 11.7 | 282.8 | 402.3 | -0.98 |
PM20-13 | 88.98 | 0.018377 | 0.000138 | 0.000629 | 0.000005 | 0.283087 | 0.000023 | 13.1 | 230.9 | 318.0 | -0.98 |
PM20-16 | 90.47 | 0.023509 | 0.000081 | 0.000798 | 0.000003 | 0.283054 | 0.000024 | 11.9 | 279.0 | 393.5 | -0.98 |
PM20-17 | 88.31 | 0.021479 | 0.000068 | 0.000719 | 0.000001 | 0.283107 | 0.000020 | 13.8 | 202.8 | 272.7 | -0.98 |
PM20-18 | 89.87 | 0.017991 | 0.000141 | 0.000614 | 0.000003 | 0.283091 | 0.000022 | 13.2 | 225.8 | 309.4 | -0.98 |
PM20-20 | 96.22 | 0.016890 | 0.000319 | 0.000578 | 0.000008 | 0.283052 | 0.000021 | 12.0 | 280.7 | 394.3 | -0.98 |
PM20-21 | 88.93 | 0.022531 | 0.000212 | 0.000765 | 0.000004 | 0.283067 | 0.000020 | 12.3 | 260.4 | 364.8 | -0.98 |
PM20-23 | 88.59 | 0.015685 | 0.000091 | 0.000548 | 0.000003 | 0.283085 | 0.000023 | 13.0 | 233.6 | 323.2 | -0.98 |
PM20-24 | 90.01 | 0.018729 | 0.000170 | 0.000634 | 0.000007 | 0.283076 | 0.000018 | 12.7 | 247.0 | 343.4 | -0.98 |
PM06-1 | 94.77 | 0.012055 | 0.000218 | 0.000511 | 0.000009 | 0.283068 | 0.000020 | 12.5 | 257.5 | 358.2 | -0.98 |
PM06-3 | 87.65 | 0.011490 | 0.000252 | 0.000477 | 0.000010 | 0.283018 | 0.000022 | 10.6 | 326.5 | 474.8 | -0.99 |
PM06-4 | 86.47 | 0.015910 | 0.000215 | 0.000662 | 0.000010 | 0.283031 | 0.000023 | 11.0 | 309.8 | 446.6 | -0.98 |
PM06-5 | 88.37 | 0.014593 | 0.001343 | 0.000615 | 0.000053 | 0.283065 | 0.000020 | 12.3 | 261.7 | 368.3 | -0.98 |
PM06-6 | 93.03 | 0.011043 | 0.000074 | 0.000463 | 0.000002 | 0.283074 | 0.000022 | 12.7 | 248.4 | 344.9 | -0.99 |
PM06-9 | 92.86 | 0.016204 | 0.000207 | 0.000677 | 0.000009 | 0.283041 | 0.000023 | 11.5 | 296.8 | 421.7 | -0.98 |
PM06-10 | 94.45 | 0.017040 | 0.000535 | 0.000695 | 0.000023 | 0.283116 | 0.000024 | 14.2 | 190.8 | 249.7 | -0.98 |
PM06-12 | 96.09 | 0.013220 | 0.000072 | 0.000547 | 0.000004 | 0.283107 | 0.000029 | 13.9 | 202.4 | 268.1 | -0.98 |
PM06-15 | 94.08 | 0.011239 | 0.000117 | 0.000464 | 0.000003 | 0.283057 | 0.000023 | 12.1 | 271.6 | 381.9 | -0.99 |
PM06-16 | 96.69 | 0.014018 | 0.000190 | 0.000577 | 0.000007 | 0.283046 | 0.000019 | 11.8 | 287.9 | 405.8 | -0.98 |
PM06-17 | 92.03 | 0.011843 | 0.000122 | 0.000505 | 0.000005 | 0.283060 | 0.000022 | 12.2 | 268.6 | 378.0 | -0.98 |
PM06-18 | 96.26 | 0.015116 | 0.000276 | 0.000623 | 0.000010 | 0.283045 | 0.000020 | 11.7 | 290.6 | 410.0 | -0.98 |
PM06-19 | 91.03 | 0.010779 | 0.000319 | 0.000457 | 0.000013 | 0.283068 | 0.000019 | 12.4 | 257.3 | 360.6 | -0.99 |
PM06-20 | 91.67 | 0.009409 | 0.000130 | 0.000406 | 0.000006 | 0.283030 | 0.000022 | 11.1 | 309.2 | 444.9 | -0.99 |
图5 冈底斯南缘晚白垩世花岗岩εHf(t)与U-Pb年龄图解(底图据Amelin等[24])
Fig.5 εHf(t) vs. U-Pb age plot for the Late Cretaceous granites in the southern Gangdese margin (after Amelin et al[24])
样品号 | SiO2 | Al2O3 | TiO2 | Fe2O3 | FeO | CaO | MgO | K2O | Na2O | MnO | P2O5 | 烧失量 | 总量 | Mg# | La | Ce | Pr | Nd | Sm | Eu | Gd | |||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
PM20-1 | 60.03 | 16.20 | 0.89 | 3.27 | 2.56 | 4.62 | 2.97 | 3.18 | 3.97 | 0.10 | 0.31 | 1.71 | 99.82 | 50.20 | 36.77 | 74.99 | 9.11 | 34.94 | 6.20 | 1.55 | 5.10 | |||||||||||||||||||||||||
PM20-2 | 59.58 | 16.62 | 0.86 | 2.51 | 3.39 | 5.39 | 3.33 | 2.65 | 4.02 | 0.10 | 0.31 | 1.05 | 99.81 | 52.80 | 37.60 | 77.80 | 9.66 | 38.14 | 6.90 | 1.75 | 5.63 | |||||||||||||||||||||||||
D9415 | 64.89 | 15.59 | 0.59 | 1.98 | 2.12 | 3.63 | 2.25 | 3.64 | 4.00 | 0.07 | 0.19 | 0.89 | 99.85 | 52.10 | 32.07 | 59.52 | 6.69 | 23.87 | 3.84 | 0.99 | 3.34 | |||||||||||||||||||||||||
D9416 | 66.83 | 15.22 | 0.51 | 1.82 | 1.73 | 3.14 | 1.86 | 4.05 | 3.85 | 0.05 | 0.16 | 0.63 | 99.85 | 50.90 | 27.53 | 54.35 | 6.40 | 22.93 | 3.78 | 0.97 | 3.12 | |||||||||||||||||||||||||
D9389 | 62.24 | 15.93 | 0.75 | 2.31 | 2.56 | 4.36 | 2.78 | 3.72 | 3.94 | 0.08 | 0.26 | 0.89 | 99.81 | 53.10 | 33.33 | 66.99 | 8.02 | 30.32 | 5.14 | 1.35 | 4.23 | |||||||||||||||||||||||||
D3816 | 62.21 | 15.88 | 0.80 | 2.71 | 2.45 | 4.35 | 2.71 | 3.77 | 3.93 | 0.09 | 0.26 | 0.67 | 99.82 | 51.00 | 30.56 | 61.72 | 7.59 | 28.72 | 4.93 | 1.22 | 4.00 | |||||||||||||||||||||||||
D3015 | 61.74 | 15.94 | 0.90 | 2.64 | 2.70 | 4.16 | 2.58 | 4.13 | 3.98 | 0.09 | 0.28 | 0.67 | 99.82 | 48.90 | 37.80 | 78.38 | 9.57 | 36.21 | 6.18 | 1.41 | 5.10 | |||||||||||||||||||||||||
D0219 | 63.90 | 16.68 | 0.74 | 1.91 | 2.00 | 3.62 | 1.36 | 4.43 | 4.13 | 0.08 | 0.27 | 0.74 | 99.86 | 40.80 | 39.85 | 76.04 | 9.51 | 36.32 | 6.58 | 1.38 | 5.56 | |||||||||||||||||||||||||
PM06 | 64.20 | 15.55 | 0.69 | 2.00 | 2.18 | 3.88 | 2.23 | 3.91 | 3.90 | 0.07 | 0.20 | 1.02 | 99.85 | 51.40 | 31.74 | 63.94 | 7.55 | 28.76 | 4.71 | 1.07 | 3.84 | |||||||||||||||||||||||||
样品号 | Tb | Dy | Ho | Er | Tm | Yb | Lu | Y | Rb | Ba | Th | U | Ta | Nb | ∑REE | LREE/ HREE | (La/ Yb)N | (La/ Sm)N | (Gd/ Yb)N | δEu | ||||||||||||||||||||||||||
PM20-1 | 0.73 | 3.94 | 0.72 | 2.07 | 0.36 | 2.23 | 0.33 | 18.31 | 89.69 | 481.50 | 8.43 | 2.71 | 0.61 | 10.80 | 197.33 | 4.84 | 11.16 | 3.73 | 1.86 | 0.82 | ||||||||||||||||||||||||||
PM20-2 | 0.80 | 4.55 | 0.83 | 2.41 | 0.41 | 2.58 | 0.37 | 20.96 | 110.96 | 569.60 | 6.69 | 2.42 | 0.58 | 8.79 | 210.41 | 4.46 | 9.86 | 3.43 | 1.77 | 0.84 | ||||||||||||||||||||||||||
D9415 | 0.44 | 2.36 | 0.44 | 1.29 | 0.23 | 1.49 | 0.22 | 11.51 | 123.55 | 437.60 | 21.78 | 6.32 | 0.72 | 9.29 | 148.30 | 5.96 | 14.58 | 5.26 | 1.82 | 0.83 | ||||||||||||||||||||||||||
D9416 | 0.43 | 2.31 | 0.42 | 1.25 | 0.22 | 1.42 | 0.21 | 12.13 | 133.45 | 497.80 | 14.25 | 4.48 | 0.57 | 8.62 | 137.46 | 5.39 | 13.10 | 4.59 | 1.78 | 0.84 | ||||||||||||||||||||||||||
D9389 | 0.59 | 3.15 | 0.57 | 1.68 | 0.30 | 1.87 | 0.28 | 15.56 | 145.02 | 597.00 | 24.26 | 7.08 | 0.66 | 9.86 | 173.37 | 5.14 | 12.02 | 4.08 | 1.83 | 0.86 | ||||||||||||||||||||||||||
D3816 | 0.56 | 3.04 | 0.54 | 1.58 | 0.27 | 1.70 | 0.25 | 15.14 | 126.68 | 460.90 | 12.86 | 2.48 | 0.45 | 10.13 | 161.83 | 4.97 | 12.11 | 3.90 | 1.90 | 0.81 | ||||||||||||||||||||||||||
D3015 | 0.72 | 3.92 | 0.71 | 2.07 | 0.35 | 2.21 | 0.32 | 18.04 | 151.92 | 470.00 | 20.68 | 3.19 | 0.70 | 12.72 | 202.99 | 5.07 | 11.58 | 3.85 | 1.88 | 0.75 | ||||||||||||||||||||||||||
D0219 | 0.83 | 4.64 | 0.87 | 2.56 | 0.45 | 2.87 | 0.42 | 22.23 | 139.39 | 415.20 | 14.52 | 3.74 | 0.66 | 13.83 | 210.11 | 4.20 | 9.39 | 3.81 | 1.57 | 0.68 | ||||||||||||||||||||||||||
PM06 | 0.54 | 2.89 | 0.53 | 1.51 | 0.23 | 1.44 | 0.23 | 15.40 | 123.00 | 416.00 | 17.80 | 4.61 | 0.67 | 10.40 | 164.39 | 5.18 | 14.94 | 4.24 | 2.17 | 0.75 |
表3 西藏桑耶地区晚白垩世石英二长岩全岩主量(%)和微量元素(10-6)分析结果
Table 3 Results of whole-rock major (%) and trace elements (10-6) analyses for the Late Cretaceous quartz monzonite in Sangye area, Tibet
样品号 | SiO2 | Al2O3 | TiO2 | Fe2O3 | FeO | CaO | MgO | K2O | Na2O | MnO | P2O5 | 烧失量 | 总量 | Mg# | La | Ce | Pr | Nd | Sm | Eu | Gd | |||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
PM20-1 | 60.03 | 16.20 | 0.89 | 3.27 | 2.56 | 4.62 | 2.97 | 3.18 | 3.97 | 0.10 | 0.31 | 1.71 | 99.82 | 50.20 | 36.77 | 74.99 | 9.11 | 34.94 | 6.20 | 1.55 | 5.10 | |||||||||||||||||||||||||
PM20-2 | 59.58 | 16.62 | 0.86 | 2.51 | 3.39 | 5.39 | 3.33 | 2.65 | 4.02 | 0.10 | 0.31 | 1.05 | 99.81 | 52.80 | 37.60 | 77.80 | 9.66 | 38.14 | 6.90 | 1.75 | 5.63 | |||||||||||||||||||||||||
D9415 | 64.89 | 15.59 | 0.59 | 1.98 | 2.12 | 3.63 | 2.25 | 3.64 | 4.00 | 0.07 | 0.19 | 0.89 | 99.85 | 52.10 | 32.07 | 59.52 | 6.69 | 23.87 | 3.84 | 0.99 | 3.34 | |||||||||||||||||||||||||
D9416 | 66.83 | 15.22 | 0.51 | 1.82 | 1.73 | 3.14 | 1.86 | 4.05 | 3.85 | 0.05 | 0.16 | 0.63 | 99.85 | 50.90 | 27.53 | 54.35 | 6.40 | 22.93 | 3.78 | 0.97 | 3.12 | |||||||||||||||||||||||||
D9389 | 62.24 | 15.93 | 0.75 | 2.31 | 2.56 | 4.36 | 2.78 | 3.72 | 3.94 | 0.08 | 0.26 | 0.89 | 99.81 | 53.10 | 33.33 | 66.99 | 8.02 | 30.32 | 5.14 | 1.35 | 4.23 | |||||||||||||||||||||||||
D3816 | 62.21 | 15.88 | 0.80 | 2.71 | 2.45 | 4.35 | 2.71 | 3.77 | 3.93 | 0.09 | 0.26 | 0.67 | 99.82 | 51.00 | 30.56 | 61.72 | 7.59 | 28.72 | 4.93 | 1.22 | 4.00 | |||||||||||||||||||||||||
D3015 | 61.74 | 15.94 | 0.90 | 2.64 | 2.70 | 4.16 | 2.58 | 4.13 | 3.98 | 0.09 | 0.28 | 0.67 | 99.82 | 48.90 | 37.80 | 78.38 | 9.57 | 36.21 | 6.18 | 1.41 | 5.10 | |||||||||||||||||||||||||
D0219 | 63.90 | 16.68 | 0.74 | 1.91 | 2.00 | 3.62 | 1.36 | 4.43 | 4.13 | 0.08 | 0.27 | 0.74 | 99.86 | 40.80 | 39.85 | 76.04 | 9.51 | 36.32 | 6.58 | 1.38 | 5.56 | |||||||||||||||||||||||||
PM06 | 64.20 | 15.55 | 0.69 | 2.00 | 2.18 | 3.88 | 2.23 | 3.91 | 3.90 | 0.07 | 0.20 | 1.02 | 99.85 | 51.40 | 31.74 | 63.94 | 7.55 | 28.76 | 4.71 | 1.07 | 3.84 | |||||||||||||||||||||||||
样品号 | Tb | Dy | Ho | Er | Tm | Yb | Lu | Y | Rb | Ba | Th | U | Ta | Nb | ∑REE | LREE/ HREE | (La/ Yb)N | (La/ Sm)N | (Gd/ Yb)N | δEu | ||||||||||||||||||||||||||
PM20-1 | 0.73 | 3.94 | 0.72 | 2.07 | 0.36 | 2.23 | 0.33 | 18.31 | 89.69 | 481.50 | 8.43 | 2.71 | 0.61 | 10.80 | 197.33 | 4.84 | 11.16 | 3.73 | 1.86 | 0.82 | ||||||||||||||||||||||||||
PM20-2 | 0.80 | 4.55 | 0.83 | 2.41 | 0.41 | 2.58 | 0.37 | 20.96 | 110.96 | 569.60 | 6.69 | 2.42 | 0.58 | 8.79 | 210.41 | 4.46 | 9.86 | 3.43 | 1.77 | 0.84 | ||||||||||||||||||||||||||
D9415 | 0.44 | 2.36 | 0.44 | 1.29 | 0.23 | 1.49 | 0.22 | 11.51 | 123.55 | 437.60 | 21.78 | 6.32 | 0.72 | 9.29 | 148.30 | 5.96 | 14.58 | 5.26 | 1.82 | 0.83 | ||||||||||||||||||||||||||
D9416 | 0.43 | 2.31 | 0.42 | 1.25 | 0.22 | 1.42 | 0.21 | 12.13 | 133.45 | 497.80 | 14.25 | 4.48 | 0.57 | 8.62 | 137.46 | 5.39 | 13.10 | 4.59 | 1.78 | 0.84 | ||||||||||||||||||||||||||
D9389 | 0.59 | 3.15 | 0.57 | 1.68 | 0.30 | 1.87 | 0.28 | 15.56 | 145.02 | 597.00 | 24.26 | 7.08 | 0.66 | 9.86 | 173.37 | 5.14 | 12.02 | 4.08 | 1.83 | 0.86 | ||||||||||||||||||||||||||
D3816 | 0.56 | 3.04 | 0.54 | 1.58 | 0.27 | 1.70 | 0.25 | 15.14 | 126.68 | 460.90 | 12.86 | 2.48 | 0.45 | 10.13 | 161.83 | 4.97 | 12.11 | 3.90 | 1.90 | 0.81 | ||||||||||||||||||||||||||
D3015 | 0.72 | 3.92 | 0.71 | 2.07 | 0.35 | 2.21 | 0.32 | 18.04 | 151.92 | 470.00 | 20.68 | 3.19 | 0.70 | 12.72 | 202.99 | 5.07 | 11.58 | 3.85 | 1.88 | 0.75 | ||||||||||||||||||||||||||
D0219 | 0.83 | 4.64 | 0.87 | 2.56 | 0.45 | 2.87 | 0.42 | 22.23 | 139.39 | 415.20 | 14.52 | 3.74 | 0.66 | 13.83 | 210.11 | 4.20 | 9.39 | 3.81 | 1.57 | 0.68 | ||||||||||||||||||||||||||
PM06 | 0.54 | 2.89 | 0.53 | 1.51 | 0.23 | 1.44 | 0.23 | 15.40 | 123.00 | 416.00 | 17.80 | 4.61 | 0.67 | 10.40 | 164.39 | 5.18 | 14.94 | 4.24 | 2.17 | 0.75 |
图6 西藏桑耶地区晚白垩世石英二长岩TAS图解((a),据Middlemost[25])、SiO2-K2O图解((b),据Rickwood[26])、A/NK-A/CNK图解((c),据Maniar和Piccoli[27])和SiO2-AR图解((d),据Wright[28]) (a)图中: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.6 TAS diagram of the Late Cretaceous quartz monzonite in Sangye area, Tibet ((a) modified after Middcemost[25], (b) modified after Rickwood[26], (c) modified after Maniar and piccoli[27] and (d) modified after Wright[28])
图7 西藏桑耶地区晚白垩世石英二长岩球粒陨石标准化稀土元素配分图((a),标准化值据Boynton[32])和原始地幔标准化微量元素蜘蛛图((b),标准化值据Sun和Mc Donough[33])
Fig.7 Chondrite-normalized REE patterns ((a),normalizing values after Boynton[32]) and primitive mantle-normalized trace element patterns ((b),normalizing values after Sun and McDonough[33]) for the Late Cretaceous quartz monzonite in Sangye area, Tibet
图8 西藏桑耶地区晚白垩世石英二长岩岩石成因类型判别图解 (a) P2O5-SiO2图解(据Li等 [47]);(b) K2O-Na2O图解(据Collins等 [48]);(c) (Zr+Nb+Ce+Y)-(FeOT/MgO)图解(据Whalen [49]);(d) Zr-SiO2图解(据Collins等 [48])
Fig.8 Petrogenetic discrimination diagrams of the Late Cretaceous quartz monzonite in Sangye area, Tibet
图9 西藏桑耶地区晚白垩世石英二长岩双变量图解 (a) La/Sm-La图解(据Allégr和Hart [50]);(b) LREE-SiO2图解;(c) Y-SiO2图解;(d) Er-Dy图解;(e) Rb-Sr图解(据Zhang等 [57]);(f) Ba-Sr图解(据Zhang等 [57])
Fig. 9 Bivariate plots of the Late Cretaceous quartz monzonite in Sangye area, Tibet
图10 西藏桑耶地区晚白垩世石英二长岩构造环境判别图解 (a) Ta-Yb图解(据Pearce等[70] );(b) (FeOT+MgO)-CaO图解(据Maniar和Piccoli[71] );(c) Rb-(Yb+Ta)图解(据Pearce等[70] );(d) Rb-Hf-Ta图解(据Batchelor和Bowdden[72] )
Fig.10 Tectonic discrimination diagrams of the Late Cretaceous quartz monzonite in Sangye area, Tibet
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