Geoscience ›› 2019, Vol. 33 ›› Issue (01): 73-84.DOI: 10.19657/j.geoscience.1000-8527.2019.01.08
• Petrology • Previous Articles Next Articles
ZHAO Yayun1(), YANG Chunsi2, LÜ Jinliang1, LIU Xiaofeng1, LIU Bo1, ZHENG Changyun1, LIU Yuanchao1, LI Li3, FU Hailong1
Received:
2018-02-13
Revised:
2018-11-05
Online:
2019-02-26
Published:
2019-02-28
CLC Number:
ZHAO Yayun, YANG Chunsi, LÜ Jinliang, LIU Xiaofeng, LIU Bo, ZHENG Changyun, LIU Yuanchao, LI Li, FU Hailong. Zircon U-Pb Age, Geochemical Characteristics and Significance of the Linzizong Group Volcanic Rocks in the Luobuzhen Orefield,Tibet,China[J]. Geoscience, 2019, 33(01): 73-84.
Fig.1 Regional tectonic(a) and geological(b) maps, showing the distribution of the Linzizong Group volcanic rocks in the Gangdise belt and map of the study area showing the sampling location(c)
样品分析 点号 | wB/10-6 | Th/ U | 同位素比值 | 年龄/Ma | ||||
---|---|---|---|---|---|---|---|---|
Th | U | 207Pb/206Pb±1σ | 207Pb/235U±1σ | 206Pb /238U±1σ | 206Pb/ 238U±1σ | |||
16S-3-1 | 4 283 | 2 280 | 1.88 | 0.065 84±0.004 87 | 0.073 73±0.005 42 | 0.008 08±0.000 19 | 51.8±1.2 | |
16S-3-2 | 399 | 482 | 0.83 | 0.253 21±0.034 66 | 0.207 19±0.017 47 | 0.007 36±0.000 35 | 47.2±2.2 | |
16S-3-3 | 714 | 775 | 0.92 | 0.153 13±0.026 48 | 0.129 48±0.009 73 | 0.007 91±0.000 31 | 50.5±2.0 | |
16S-3-4 | 513 | 587 | 0.87 | 0.225 22±0.042 45 | 0.190 50±0.016 57 | 0.007 89±0.000 30 | 50.6±1.9 | |
16S-3-5 | 653 | 527 | 1.24 | 0.252 64±0.038 78 | 0.220 46±0.023 78 | 0.007 08±0.000 31 | 45.5±2.0 | |
16S-3-6 | 550 | 384 | 1.43 | 0.318 62±0.043 98 | 0.280 75±0.022 18 | 0.007 73±0.000 37 | 49.7±2.4 | |
16S-3-7 | 678 | 556 | 1.22 | 0.095 43±0.035 90 | 0.068 70±0.028 15 | 0.006 78±0.000 62 | 43.5±3.9 | |
16S-3-8 | 539 | 613 | 0.88 | 0.085 93±0.029 35 | 0.070 40±0.027 09 | 0.007 15±0.000 59 | 45.9±3.8 | |
16S-3-9 | 613 | 450 | 1.36 | 0.176 88±0.059 74 | 0.102 80±0.037 06 | 0.006 70±0.000 57 | 43.1±3.7 | |
16S-3-10 | 458 | 489 | 0.94 | 0.157 02±0.049 62 | 0.111 44±0.037 76 | 0.007 11±0.000 57 | 45.6±3.7 | |
16S-3-11 | 332 | 601 | 0.55 | 0.097 09±0.027 01 | 0.094 82±0.029 68 | 0.007 65±0.000 57 | 49.1±3.7 | |
16S-3-12 | 1 195 | 1 162 | 1.03 | 0.076 14±0.020 17 | 0.065 82±0.019 38 | 0.007 25±0.000 51 | 46.6±3.3 | |
16S-3-13 | 941 | 653 | 1.44 | 0.118 70±0.025 46 | 0.115 47±0.025 84 | 0.007 81±0.000 51 | 50.2±3.2 | |
16S-3-14 | 739 | 657 | 1.12 | 0.135 95±0.032 43 | 0.138 50±0.029 94 | 0.007 87±0.000 55 | 50.5±3.5 | |
16S-3-15 | 405 | 349 | 1.16 | 0.235 56±0.053 68 | 0.211 89±0.041 59 | 0.007 95±0.000 57 | 51.0±3.6 | |
16S-3-16 | 640 | 547 | 1.17 | 0.199 82±0.063 47 | 0.130 46±0.024 97 | 0.007 70±0.000 47 | 49.5±3.0 | |
16S-3-17 | 486 | 510 | 0.95 | 0.203 63±0.069 42 | 0.143 78±0.024 21 | 0.007 66±0.000 44 | 49.2±2.8 | |
16S-3-18 | 557 | 600 | 0.93 | 0.179 43±0.037 64 | 0.130 91±0.020 93 | 0.007 42±0.000 43 | 47.6±2.8 | |
16S-3-19 | 576 | 582 | 0.99 | 0.179 73±0.031 26 | 0.151 92±0.020 76 | 0.007 91±0.000 38 | 50.8±2.4 | |
16S-3-20 | 15 88 | 722 | 2.20 | 0.133 22±0.015 74 | 0.129 28±0.014 64 | 0.007 50±0.000 36 | 48.1±2.3 | |
16S-3-21 | 1 071 | 986 | 1.09 | 0.116 47±0.017 72 | 0.099 02±0.010 24 | 0.007 49±0.000 34 | 48.1±2.2 | |
16S-3-22 | 537 | 620 | 0.87 | 0.177 16±0.026 17 | 0.163 49±0.019 49 | 0.007 48±0.000 37 | 48.1±2.4 | |
16S-3-23 | 2 588 | 1 225 | 2.11 | 0.105 98±0.013 65 | 0.095 45±0.010 01 | 0.007 41±0.000 29 | 47.6±1.9 | |
16S-3-24 | 1 555 | 1 030 | 1.51 | 0.122 88±0.013 48 | 0.112 10±0.009 87 | 0.007 83±0.000 30 | 50.3±1.9 | |
16S-3-25 | 503 | 603 | 0.83 | 0.234 39±0.039 13 | 0.216 85±0.026 67 | 0.007 43±0.000 34 | 47.7±2.2 | |
16S-3-26 | 579 | 610 | 0.95 | 0.176 04±0.017 31 | 0.183 75±0.016 18 | 0.007 95±0.000 35 | 51.0±2.2 | |
16S-3-27 | 518 | 581 | 0.89 | 0.286 54±0.039 78 | 0.224 29±0.020 27 | 0.007 31±0.000 31 | 46.7±2.0 | |
16S-3-28 | 849 | 688 | 1.23 | 0.179 16±0.020 26 | 0.173 93±0.018 12 | 0.007 74±0.000 36 | 49.7±2.3 | |
16S-3-29 | 584 | 603 | 0.97 | 0.337 44±0.050 04 | 0.216 01±0.019 70 | 0.007 50±0.000 36 | 48.2±2.3 |
Table 1 LA-ICP-MS zircon U-Pb isotopic data of the Linzizong Group volcanic rocks in the Luobuzhen orefield
样品分析 点号 | wB/10-6 | Th/ U | 同位素比值 | 年龄/Ma | ||||
---|---|---|---|---|---|---|---|---|
Th | U | 207Pb/206Pb±1σ | 207Pb/235U±1σ | 206Pb /238U±1σ | 206Pb/ 238U±1σ | |||
16S-3-1 | 4 283 | 2 280 | 1.88 | 0.065 84±0.004 87 | 0.073 73±0.005 42 | 0.008 08±0.000 19 | 51.8±1.2 | |
16S-3-2 | 399 | 482 | 0.83 | 0.253 21±0.034 66 | 0.207 19±0.017 47 | 0.007 36±0.000 35 | 47.2±2.2 | |
16S-3-3 | 714 | 775 | 0.92 | 0.153 13±0.026 48 | 0.129 48±0.009 73 | 0.007 91±0.000 31 | 50.5±2.0 | |
16S-3-4 | 513 | 587 | 0.87 | 0.225 22±0.042 45 | 0.190 50±0.016 57 | 0.007 89±0.000 30 | 50.6±1.9 | |
16S-3-5 | 653 | 527 | 1.24 | 0.252 64±0.038 78 | 0.220 46±0.023 78 | 0.007 08±0.000 31 | 45.5±2.0 | |
16S-3-6 | 550 | 384 | 1.43 | 0.318 62±0.043 98 | 0.280 75±0.022 18 | 0.007 73±0.000 37 | 49.7±2.4 | |
16S-3-7 | 678 | 556 | 1.22 | 0.095 43±0.035 90 | 0.068 70±0.028 15 | 0.006 78±0.000 62 | 43.5±3.9 | |
16S-3-8 | 539 | 613 | 0.88 | 0.085 93±0.029 35 | 0.070 40±0.027 09 | 0.007 15±0.000 59 | 45.9±3.8 | |
16S-3-9 | 613 | 450 | 1.36 | 0.176 88±0.059 74 | 0.102 80±0.037 06 | 0.006 70±0.000 57 | 43.1±3.7 | |
16S-3-10 | 458 | 489 | 0.94 | 0.157 02±0.049 62 | 0.111 44±0.037 76 | 0.007 11±0.000 57 | 45.6±3.7 | |
16S-3-11 | 332 | 601 | 0.55 | 0.097 09±0.027 01 | 0.094 82±0.029 68 | 0.007 65±0.000 57 | 49.1±3.7 | |
16S-3-12 | 1 195 | 1 162 | 1.03 | 0.076 14±0.020 17 | 0.065 82±0.019 38 | 0.007 25±0.000 51 | 46.6±3.3 | |
16S-3-13 | 941 | 653 | 1.44 | 0.118 70±0.025 46 | 0.115 47±0.025 84 | 0.007 81±0.000 51 | 50.2±3.2 | |
16S-3-14 | 739 | 657 | 1.12 | 0.135 95±0.032 43 | 0.138 50±0.029 94 | 0.007 87±0.000 55 | 50.5±3.5 | |
16S-3-15 | 405 | 349 | 1.16 | 0.235 56±0.053 68 | 0.211 89±0.041 59 | 0.007 95±0.000 57 | 51.0±3.6 | |
16S-3-16 | 640 | 547 | 1.17 | 0.199 82±0.063 47 | 0.130 46±0.024 97 | 0.007 70±0.000 47 | 49.5±3.0 | |
16S-3-17 | 486 | 510 | 0.95 | 0.203 63±0.069 42 | 0.143 78±0.024 21 | 0.007 66±0.000 44 | 49.2±2.8 | |
16S-3-18 | 557 | 600 | 0.93 | 0.179 43±0.037 64 | 0.130 91±0.020 93 | 0.007 42±0.000 43 | 47.6±2.8 | |
16S-3-19 | 576 | 582 | 0.99 | 0.179 73±0.031 26 | 0.151 92±0.020 76 | 0.007 91±0.000 38 | 50.8±2.4 | |
16S-3-20 | 15 88 | 722 | 2.20 | 0.133 22±0.015 74 | 0.129 28±0.014 64 | 0.007 50±0.000 36 | 48.1±2.3 | |
16S-3-21 | 1 071 | 986 | 1.09 | 0.116 47±0.017 72 | 0.099 02±0.010 24 | 0.007 49±0.000 34 | 48.1±2.2 | |
16S-3-22 | 537 | 620 | 0.87 | 0.177 16±0.026 17 | 0.163 49±0.019 49 | 0.007 48±0.000 37 | 48.1±2.4 | |
16S-3-23 | 2 588 | 1 225 | 2.11 | 0.105 98±0.013 65 | 0.095 45±0.010 01 | 0.007 41±0.000 29 | 47.6±1.9 | |
16S-3-24 | 1 555 | 1 030 | 1.51 | 0.122 88±0.013 48 | 0.112 10±0.009 87 | 0.007 83±0.000 30 | 50.3±1.9 | |
16S-3-25 | 503 | 603 | 0.83 | 0.234 39±0.039 13 | 0.216 85±0.026 67 | 0.007 43±0.000 34 | 47.7±2.2 | |
16S-3-26 | 579 | 610 | 0.95 | 0.176 04±0.017 31 | 0.183 75±0.016 18 | 0.007 95±0.000 35 | 51.0±2.2 | |
16S-3-27 | 518 | 581 | 0.89 | 0.286 54±0.039 78 | 0.224 29±0.020 27 | 0.007 31±0.000 31 | 46.7±2.0 | |
16S-3-28 | 849 | 688 | 1.23 | 0.179 16±0.020 26 | 0.173 93±0.018 12 | 0.007 74±0.000 36 | 49.7±2.3 | |
16S-3-29 | 584 | 603 | 0.97 | 0.337 44±0.050 04 | 0.216 01±0.019 70 | 0.007 50±0.000 36 | 48.2±2.3 |
样品号 | SiO2 | TiO2 | Al2O3 | Fe2O3 | FeO | MnO | MgO | CaO | Na2O | K2O | P2O5 | H2O+ | 烧失量 | 总量 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
16SGS-3a/b | 71.45 | 0.32 | 13.42 | 1.08 | 1.48 | 0.06 | 0.55 | 1.37 | 3.65 | 5.02 | 0.09 | 0.87 | 1.34 | 100.70 |
16SGS-4a/b | 65.96 | 0.54 | 15.03 | 1.80 | 2.40 | 0.11 | 1.26 | 2.60 | 4.49 | 4.00 | 0.16 | 0.92 | 1.49 | 100.76 |
样品号 | ALK | La | Ce | Pr | Nd | Sm | Eu | Gd | Tb | Dy | Ho | Er | Tm | Yb |
16SGS-3a/b | 8.67 | 40.20 | 75.20 | 8.12 | 28.40 | 4.98 | 0.77 | 4.25 | 0.68 | 3.54 | 0.70 | 2.18 | 0.33 | 2.32 |
16SGS-4a/b | 8.49 | 35.20 | 62.50 | 7.26 | 26.30 | 5.22 | 1.03 | 4.23 | 0.65 | 3.36 | 0.66 | 1.98 | 0.28 | 1.96 |
样品号 | Lu | ∑REE | δEu | Rb | Th | U | Nb | Ta | Sr | Zr | Hf | Y | Nb* | |
16SGS-3a/b | 0.34 | 172.01 | 0.50 | 183.00 | 21.40 | 2.95 | 12.30 | 1.20 | 218.00 | 168.00 | 6.85 | 22.30 | 0.15 | |
16SGS-4a/b | 0.28 | 150.91 | 0.65 | 133.00 | 13.60 | 2.12 | 10.90 | 0.92 | 422.00 | 208.00 | 5.63 | 20.10 | 0.17 |
Table 2 Major(%),trace (10-6),REE(10-6) elements and key parameters of the Pana Formation volcanic rocks in the Luobuzhen orefield
样品号 | SiO2 | TiO2 | Al2O3 | Fe2O3 | FeO | MnO | MgO | CaO | Na2O | K2O | P2O5 | H2O+ | 烧失量 | 总量 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
16SGS-3a/b | 71.45 | 0.32 | 13.42 | 1.08 | 1.48 | 0.06 | 0.55 | 1.37 | 3.65 | 5.02 | 0.09 | 0.87 | 1.34 | 100.70 |
16SGS-4a/b | 65.96 | 0.54 | 15.03 | 1.80 | 2.40 | 0.11 | 1.26 | 2.60 | 4.49 | 4.00 | 0.16 | 0.92 | 1.49 | 100.76 |
样品号 | ALK | La | Ce | Pr | Nd | Sm | Eu | Gd | Tb | Dy | Ho | Er | Tm | Yb |
16SGS-3a/b | 8.67 | 40.20 | 75.20 | 8.12 | 28.40 | 4.98 | 0.77 | 4.25 | 0.68 | 3.54 | 0.70 | 2.18 | 0.33 | 2.32 |
16SGS-4a/b | 8.49 | 35.20 | 62.50 | 7.26 | 26.30 | 5.22 | 1.03 | 4.23 | 0.65 | 3.36 | 0.66 | 1.98 | 0.28 | 1.96 |
样品号 | Lu | ∑REE | δEu | Rb | Th | U | Nb | Ta | Sr | Zr | Hf | Y | Nb* | |
16SGS-3a/b | 0.34 | 172.01 | 0.50 | 183.00 | 21.40 | 2.95 | 12.30 | 1.20 | 218.00 | 168.00 | 6.85 | 22.30 | 0.15 | |
16SGS-4a/b | 0.28 | 150.91 | 0.65 | 133.00 | 13.60 | 2.12 | 10.90 | 0.92 | 422.00 | 208.00 | 5.63 | 20.10 | 0.17 |
Fig.6 TAS ((a),base map after LE MAITRE et al.[39]) and SiO2-K2O ((b),base map after PECCERILLO et al.[40])diagrams of the Pana Formation volcanic rocks in the Luobuzhen orefield
Fig.7 Primitive mantle-normalized trace element spider diagrams of the Pana Formation volcanic rocks in the Luobuzhen orefield(normalizing data after SUN et al.[38])
地区 | 岩性 | 测试对象 | 测试方法 | 年龄/Ma | 均值/Ma | 资料来源 |
---|---|---|---|---|---|---|
打加措(西段) | 火山岩 | 全岩 | Ar-Ar法 | 48.9±0.8 | 51.4 | Lee等[ |
狮泉河(西段) | 流纹岩 | 锆石 | LA-ICP-MS U-Pb法 | 53.9±0.5 | 付文春等[ | |
罗布真(中段) | 英安岩 | 锆石 | LA-ICP-MS U-Pb法 | 50.3±1.4 | 48.8 | 吴松等[ |
罗布真(中段) | 英安岩 | 锆石 | LA-ICP-MS U-Pb法 | 50.0±0.5 | 吴松等[ | |
罗布真(中段) | 英安岩 | 锆石 | LA-ICP-MS U-Pb法 | 50.2±1.7 | 本次 | |
朱诺北西(中段) | 流纹质晶屑凝灰岩 | 锆石 | LA-ICP-MS U-Pb法 | 48.9±0.8 | 梁银平等[ | |
桑桑(中段) | 英安岩 | 全岩 | Ar-Ar法 | 47.7±2.2 | Lee等 [ | |
桑桑(中段) | 英安岩 | 全岩 | Ar-Ar法 | 45.1±1.6 | Lee等[ | |
林周 | 流纹质熔结凝灰岩 | 透长石 | Ar-Ar法 | 38.7±0.4 | 47.5 | 周肃等[ |
林周帕那西沟 | 流纹岩 | 斜长石 | Ar-Ar法 | 54.3±3.9 | 周肃等[ | |
林周帕那西沟 | 流纹岩 | 全岩 | Ar-Ar法 | 48.4±1.3 | 周肃等[ | |
林周年波北 | 流纹质熔结凝灰岩 | 全岩 | Ar-Ar法 | 43.93±1.3 | 周肃等[ | |
林周年波南 | 流纹岩 | 钾长石 | Ar-Ar法 | 51.60±2.6 | 周肃等[ | |
林周羊应外围 | 流纹岩 | 全岩 | Ar-Ar法 | 52.91±1.73 | 莫宣学等[ | |
林周—乌郁 | 英安岩 | 斜长石 | Ar-Ar法 | 42.9±2.5 | 莫宣学等[ | |
林周盆地 | 英安质凝灰岩 | 锆石 | U-Pb法 | 47.1±1.2 | He等[ |
Table 3 Ages of the Pana Formation volcanic rocks in the Linzizong Group, Luobuzhen orefield
地区 | 岩性 | 测试对象 | 测试方法 | 年龄/Ma | 均值/Ma | 资料来源 |
---|---|---|---|---|---|---|
打加措(西段) | 火山岩 | 全岩 | Ar-Ar法 | 48.9±0.8 | 51.4 | Lee等[ |
狮泉河(西段) | 流纹岩 | 锆石 | LA-ICP-MS U-Pb法 | 53.9±0.5 | 付文春等[ | |
罗布真(中段) | 英安岩 | 锆石 | LA-ICP-MS U-Pb法 | 50.3±1.4 | 48.8 | 吴松等[ |
罗布真(中段) | 英安岩 | 锆石 | LA-ICP-MS U-Pb法 | 50.0±0.5 | 吴松等[ | |
罗布真(中段) | 英安岩 | 锆石 | LA-ICP-MS U-Pb法 | 50.2±1.7 | 本次 | |
朱诺北西(中段) | 流纹质晶屑凝灰岩 | 锆石 | LA-ICP-MS U-Pb法 | 48.9±0.8 | 梁银平等[ | |
桑桑(中段) | 英安岩 | 全岩 | Ar-Ar法 | 47.7±2.2 | Lee等 [ | |
桑桑(中段) | 英安岩 | 全岩 | Ar-Ar法 | 45.1±1.6 | Lee等[ | |
林周 | 流纹质熔结凝灰岩 | 透长石 | Ar-Ar法 | 38.7±0.4 | 47.5 | 周肃等[ |
林周帕那西沟 | 流纹岩 | 斜长石 | Ar-Ar法 | 54.3±3.9 | 周肃等[ | |
林周帕那西沟 | 流纹岩 | 全岩 | Ar-Ar法 | 48.4±1.3 | 周肃等[ | |
林周年波北 | 流纹质熔结凝灰岩 | 全岩 | Ar-Ar法 | 43.93±1.3 | 周肃等[ | |
林周年波南 | 流纹岩 | 钾长石 | Ar-Ar法 | 51.60±2.6 | 周肃等[ | |
林周羊应外围 | 流纹岩 | 全岩 | Ar-Ar法 | 52.91±1.73 | 莫宣学等[ | |
林周—乌郁 | 英安岩 | 斜长石 | Ar-Ar法 | 42.9±2.5 | 莫宣学等[ | |
林周盆地 | 英安质凝灰岩 | 锆石 | U-Pb法 | 47.1±1.2 | He等[ |
Fig.9 Na2O-K2O ((a),base map after WYLLIE et al.[43]) and ternary Rb/30-Hf-3Ta ((b),base map after HARRIS et al.[46])diagrams of the Pana Formation volcanic rocks in the Luobuzhen orefield
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