Geochronology, Petrogeochemistry and Petrogenesis of Ore-Bearing Rock Massif in Dabu Mining Area, Tibet
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摘要: 达布矿区位于冈底斯成矿带中段南侧,具较大的铜(钼)成矿潜力.通过对达布矿区含矿花岗闪长岩体开展岩石学、LA-ICP-MS锆石U-Pb定年和岩石地球化学等方面的分析研究,结果显示达布矿区花岗闪长岩体是主要的含矿岩体之一,其LA-ICP-MS锆石U-Pb年龄为16.5±0.3 Ma~16.0±0.4 Ma,属中新世(N1).岩体具高Al(Al2O3=15.6%~16.5%)、高Na(Na2O=4.51%~4.82%)、钙碱性系列、弱过铝质;稀土元素具弱正铕异常(Eu/Eu*=1.02~1.27)和正铈异常(Ce/Ce*=0.99~1.53);富集Rb、Ba、Sr和亏损Nb、Ta、Ti、Y.达布矿区花岗闪长岩体属Ⅰ型花岗岩,类似于典型的C型埃达克岩,明显有别于冈底斯带中新世高K埃达克岩;为印度-亚洲大陆碰撞后局部伸展背景下,由加厚下地壳物质(石榴石角闪岩)较高程度部分熔融的岩浆产物.Abstract: Dabu mining area is located in the southern part of the middle Gangdese metallogenic belt, which has great metallogenic potential of Cu (Mo) deposit. In this paper, petrology, LA-ICP-MS zircon U-Pb dating, rock geochemistry of the Dabu ore-bearing granodiorite body are systematically studied. The results suggest that the Dabu granodiorite pluton is one of the major ore-bearing rock body, and its LA-ICP-MS zircon U-Pb age is 16.5±0.3 Ma-16.0±0.4 Ma, with the corresponding age of Miocene (N1). The rock mass has high Al (Al2O3=15.6%-16.5%), high Na (Na2O=4.51%-4.82%), and it is calc-alkaline and weakly peraluminous. REE elements have weak positive Eu anomalies (Eu/Eu*=1.02-1.27) and positive Ce anomalies (Ce/Ce*=0.99-1.53). Trace elements ratio spider diagram displays apparent enrichments of Rb, Ba, Sr and marked depletions of Nb, Ta, Ti, Y. The Dabu granodiorite pluton belongs to Ⅰ-type granite, which is similar to the typical C-type adakite, but is obviously different from the Miocene high-K adakite in the Gangdese belt. It is concluded that Dabu granodiorite pluton is a relatively high degree of partial melting of the thickened lower crust material (garnet amphibolite) formed in the background of partial extension of the India Asian continent post-collision.
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Key words:
- granodiorite /
- zircon U-Pb dating /
- petrology /
- geochemistry /
- petrogenesis /
- mining area of Dabu /
- Tibet
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图 1 西藏达布铜(钼)矿区地质简图
Ⅰ.喜马拉雅板块;Ⅰ-1.高喜马拉雅带;Ⅰ-2.特提斯喜马拉雅带;Ⅱ.冈底斯-念青唐古拉板块;Ⅱ-1.冈底斯-下察隅晚燕山-喜山期岩浆弧带;Ⅱ-2.隆格尔-念青唐古拉复合古岛弧带;Ⅱ-3.革吉-申扎弧后盆地带;Ⅱ-4.它日错-班戈-那曲前陆盆地;Ⅲ.羌南-保山板块;①STDS-藏南拆离系;②印度河-雅鲁藏布江板块缝合带;③狮泉河-永珠-嘉黎弧后蛇绿岩带;④班公湖-怒江板块缝合带;1.第四系全新统洪冲积;2.中新世花岗闪长岩;3.中新世二长花岗斑岩;4.始新世石英闪长岩;5.石英脉;6.花岗斑岩脉;7.花岗细晶岩脉;8.地质界线;9.走滑断层;10.逆断层;11.大断裂带;12.拆离断裂带;13.板块缝合带;14.铜(钼)矿体;15.研究区范围;16.硅酸盐样;17.同位素年龄样;18.平硐及其编号;图a据潘桂棠(2013);图b据郑高峰等(2011)、高一鸣等(2012)修编
Fig. 1. Geological sketch of the Dabu Cu (Mo) mining area in Tibet
图 5 达布矿区花岗闪长岩体TAS分类图解
1.橄榄辉长岩;2.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.似长辉长岩;14.似长二长闪长岩;15.似长正长闪长岩;16.似长正长岩;17.似长岩;18.霓方钠岩/磷霞岩/粗白榴岩;Ir为Irvine分界线(Irvine and Baragar, 1971);A.碱性系列;S.亚碱性系列;底图据Cox et al.(1979)
Fig. 5. The TAS classification diagram of the granodiorite in Dabu mining area
图 6 达布矿区花岗闪长岩体AFM(a)、K2O-SiO2(b)、K2O-Na2O(c)和A/NK-A/CNK(d)图解
TH.拉斑玄武岩系列;CA.钙碱性系列;图b, c中达布(1)据夏抱本等(2007),驱龙据郑有业等(2004),拉抗俄、南木、厅宫据侯增谦等(2003a),达布(2)本文;图a底图据Irvine and Baragar(1971);图b底图据Peccerillo and Taylor(1976)、Middlemost(1985);图c底图据Middlemost(1975);图d底图据Maniar and Piccoli(1989)
Fig. 6. AFM (a), K2O-SiO2 (b), K2O-Na2O (c) and A/NK-A/CNK (d) diagrams of the granodiorite in Dabu mining area
图 7 达布矿区花岗闪长岩稀土元素配分模式(a)和微量元素比值蛛网图(b)
图a球粒陨石标准化值和图b原始地幔标准化值据Sun and McDonough(1989)
Fig. 7. REE pattern (a) and trace elements spider diagram (b) of the granodiorite in Dabu mining area
图 8 达布矿区花岗闪长岩体Na2O-K2O图(a)和Sr/Y-Y图(b)
Ⅰ型.Ⅰ型花岗岩;S型.S型花岗岩;A型.A型花岗岩;图a, b中达布(1)据夏抱本等(2007),驱龙据郑有业等(2004),拉抗俄、南木、厅宫据侯增谦等(2003a),达布(2)本文;图a底图据Collins et al.(1982);图b底图据Defant and Drummond(1990)
Fig. 8. Na2O-K2O (a) and Sr/Y-Y (b) diagram of the granodiorite type in Dabu mining area
图 9 达布矿区花岗闪长岩体Zr/Sm-Y(a)和Sm/Yb-Y(b)图解
底图据侯增谦等(2005)
Fig. 9. Zr/Sm-Y (a) and Sm/Yb-Y (b) diagrams of the granodiorite in Dabu mining area
图 10 达布矿区花岗闪长岩体A/MF-C/MF图(a)和LaN/YbN-YbN图(b)
图b中达布(1)据夏抱本等(2007),拉抗俄、南木、厅宫据侯增谦等(2003a),达布(2)本文;图a底图据Altherr et al.(2000);图b底图据Drummond and Defant(1990);图b中曲线刻度为源区部分熔融程度
Fig. 10. A/MF-C/MF (a) and LaN/YbN-YbN (b) diagram of the granodiorite in Dabu mining area
图 11 达布矿区花岗闪长岩R1-R2构造环境判别图
①地幔分异产物;②板块碰撞前;③碰撞后;④造山晚期;⑤非造山;⑥同碰撞;⑦造山后;底图据Batchelor and Bowden(1985)
Fig. 11. R1-R2 tectonic setting discrimination diagram of the granodiorite in the Dabu mining area
表 1 达布矿区花岗闪长岩体LA-ICP-MS锆石U-Pb同位素分析结果
Table 1. LA-ICP-MS U-Pb data for zircons from the granodiorite in Dabu mining area
测点序号 Pb(10-6) Th(10-6) U(10-6) 232Th/238U 同位素比值 年龄(Ma) 207Pb*/206Pb* ±1σ 207Pb*/235U ±1σ 206Pb*/238U ±1σ 207Pb/235U ±1σ 206Pb/238U ±1σ 样品BD205-1(中细粒花岗闪长岩) BD205-1_01 11.0 399 485 0.82 0.078 84 0.013 68 0.021 93 0.003 11 0.002 57 0.000 10 22.0 3.1 16.6 0.7 BD205-1_02 12.7 785 897 0.88 0.047 82 0.006 30 0.015 45 0.001 33 0.002 62 0.000 09 15.6 1.3 16.9 0.6 BD205-1_03 9.9 688 818 0.84 0.088 80 0.010 28 0.026 69 0.001 85 0.002 51 0.000 08 26.7 1.8 16.2 0.5 BD205-1_04 9.2 761 767 0.99 0.055 73 0.011 36 0.014 26 0.001 76 0.002 54 0.000 09 14.4 1.8 16.4 0.6 BD205-1_05 16.1 1 187 1 038 1.14 0.073 86 0.007 57 0.024 23 0.002 33 0.002 59 0.000 09 24.3 2.3 16.7 0.6 BD205-1_06 69.5 6 252 2 246 2.78 0.066 43 0.007 56 0.023 61 0.002 62 0.002 55 0.000 06 23.7 2.6 16.4 0.4 BD205-1_07 7.1 461 580 0.80 0.074 10 0.014 24 0.021 09 0.004 09 0.002 49 0.000 11 21.2 4.1 16.0 0.7 BD205-1_08 18.5 1 476 961 1.54 0.066 94 0.007 68 0.021 61 0.001 83 0.002 58 0.000 07 21.7 1.8 16.6 0.5 BD205-1_09 16.5 848 825 1.03 0.071 20 0.008 67 0.021 53 0.001 99 0.002 54 0.000 08 21.6 2.0 16.4 0.5 BD205-1_10 8.8 641 680 0.94 0.068 02 0.016 81 0.016 37 0.002 39 0.002 55 0.000 09 16.5 2.4 16.4 0.6 BD205-1_11 6.0 499 483 1.03 0.088 32 0.015 77 0.023 29 0.003 22 0.002 54 0.000 10 23.4 3.2 16.3 0.7 样品BD206-1(中细粒花岗闪长岩) BD206-1_01 14.3 942 794 1.19 0.051 69 0.009 80 0.016 86 0.002 62 0.002 53 0.000 10 17.0 2.6 16.3 0.6 BD206-1_02 5.6 406 512 0.79 0.092 10 0.021 28 0.023 32 0.004 22 0.002 42 0.000 19 23.4 4.2 15.6 1.2 BD206-1_03 21.7 1 856 1 275 1.46 0.057 06 0.005 33 0.018 62 0.001 44 0.002 43 0.000 06 18.7 1.4 15.7 0.4 BD206-1_04 5.8 427 419 1.02 0.059 58 0.014 69 0.015 63 0.003 01 0.002 56 0.000 11 15.8 3.0 16.5 0.7 BD206-1_05 12.4 985 893 1.10 0.065 29 0.008 14 0.021 61 0.002 05 0.002 54 0.000 08 21.7 2.0 16.4 0.5 BD206-1_06 21.7 1 822 1 253 1.45 0.061 79 0.006 51 0.019 02 0.001 61 0.002 46 0.000 06 19.1 1.6 15.8 0.4 BD206-1_07 11.3 922 816 1.13 0.065 61 0.013 27 0.020 02 0.002 72 0.002 47 0.000 11 20.1 2.7 15.9 0.7 BD206-1_08 10.6 615 693 0.89 0.110 92 0.023 29 0.030 94 0.004 05 0.002 47 0.000 11 30.9 4.0 15.9 0.7 BD206-1_09 72.6 6 508 2 497 2.61 0.044 65 0.007 99 0.014 61 0.002 22 0.002 48 0.000 09 14.7 2.2 16.0 0.6 注:Pb*代表放射性成因铅;分析测试在中国地质大学(武汉)地质过程与矿产资源国家重点实验室完成. 表 2 达布矿区花岗闪长岩体主量元素分析结果(%)
Table 2. Major elements (%) of the granodiorite in Dabu mining area
样号 BD203-1 BD205-1 BD205-2 BD205-3 BD205-4 BD205-5 BD206-1 BD206-2 SiO2 65.3 65.8 66.1 65.8 67.8 66.1 65.0 65.5 TiO2 0.46 0.42 0.44 0.44 0.40 0.42 0.45 0.43 Al2O3 16.5 16.2 16.1 16.1 15.6 15.7 16.0 15.9 Fe2O3 0.37 0.33 1.42 0.31 0.55 0.22 0.67 0.83 FeO 3.94 2.99 2.40 2.99 2.36 2.80 2.80 2.59 MnO 0.04 0.04 0.04 0.04 0.03 0.03 0.05 0.05 MgO 1.57 1.37 1.48 1.48 1.43 1.38 1.44 1.43 CaO 2.85 2.88 2.63 2.82 1.77 2.62 3.13 3.03 Na2O 4.79 4.68 4.71 4.82 4.81 4.53 4.51 4.71 K2O 2.66 2.52 2.77 2.41 2.56 2.94 2.59 2.78 P2O5 0.20 0.18 0.18 0.20 0.18 0.18 0.18 0.19 H2O+ 0.61 1.08 0.93 0.95 1.20 0.90 1.13 0.95 CO2 0.33 0.54 0.27 0.65 0.33 0.54 0.71 0.71 Total 99.6 99.1 99.5 99.0 99.0 98.4 98.7 99.1 σ 2.48 2.27 2.42 2.29 2.19 2.42 2.28 2.50 A/CNK 1.03 1.03 1.04 1.03 1.12 1.02 1.01 0.97 c 1.80 2.28 1.71 2.45 2.92 2.03 2.23 1.73 注:分析测试单位为西南冶金地质测试所,下同. 表 3 达布矿区花岗闪长岩体稀土元素分析结果(10-6)
Table 3. Rare earth elements (10-6) of the granodiorite in Dabu mining area
样号 BD203-1 BD205-1 BD205-2 BD205-3 BD205-4 BD205-5 BD206-1 BD206-2 La 18.5 16.3 17.1 19.1 13.9 15.7 17.4 16.2 Ce 49.1 47.3 43.9 44.7 33.5 41.3 49.4 30.6 Pr 4.01 3.54 3.46 4.04 2.86 3.36 3.70 3.53 Nd 16.8 14.6 14.4 17.4 12.0 13.8 17.6 14.9 Sm 2.82 2.49 2.44 3.01 1.98 2.31 2.60 2.49 Eu 0.85 0.74 0.75 1.14 0.59 0.76 0.77 0.74 Gd 2.21 1.91 1.88 2.50 1.55 1.71 1.94 1.77 Tb 0.26 0.23 0.23 0.33 0.18 0.21 0.22 0.21 Dy 1.20 1.09 1.10 1.68 0.75 1.05 1.06 0.93 Ho 0.25 0.23 0.24 0.30 0.15 0.22 0.21 0.18 Er 0.96 0.83 0.85 0.92 0.54 0.70 0.76 0.49 Tm 0.12 0.11 0.11 0.10 0.05 0.11 0.09 0.06 Yb 0.89 0.83 0.86 0.67 0.64 0.82 0.72 0.80 Lu 0.16 0.15 0.16 0.10 0.06 0.15 0.12 0.07 Y 6.59 6.14 6.84 6.82 5.58 6.74 6.88 6.71 ∑REE 98.1 90.4 87.5 95.9 68.7 82.3 96.6 73.0 (La/Yb)N 15.0 14.1 14.3 20.5 15.6 13.8 17.2 14.6 Eu/Eu* 1.04 1.04 1.08 1.27 1.02 1.16 1.04 1.08 Ce/Ce* 1.40 1.53 1.40 1.25 1.30 1.39 1.51 0.99 表 4 达布矿区花岗闪长岩体微量元素分析结果(10-6)
Table 4. Trace elements (10-6) of the granodiorite in Dabu mining area
样号 BD203-1 BD205-1 BD205-2 BD205-3 BD205-4 BD205-5 BD206-1 BD206-2 Rb 98.7 87.8 106 98.0 94.7 107 89.5 92.4 Sr 915 884 852 885 751 836 866 856 Ba 763 700 735 674 694 717 736 764 Th 8.23 10.9 10.6 9.73 8.93 8.96 9.05 9.23 U 1.34 2.39 1.15 2.32 1.18 2.03 1.96 2.23 Ta 0.20 0.20 0.16 0.17 0.13 0.14 0.23 0.25 Nb 3.54 3.32 2.61 2.70 2.00 2.30 3.40 3.95 Zr 130 118 121 132 118 111 115 118 Hf 3.85 3.45 3.67 4.33 4.45 5.14 3.41 3.35 Sc 8.44 3.09 5.84 5.89 6.62 8.73 4.76 6.75 V 75.7 66.0 66.2 70.9 62.8 67.6 68.5 75.1 Cr 35.8 27.4 32.5 23.7 18.9 21.4 24.8 21.1 Co 9.30 7.93 7.90 7.44 6.83 8.70 8.70 8.41 Ni 12.1 10.5 12.3 13.2 12.0 11.8 11.9 12.7 Cu 917 764 864 1536 1819 2877 872 678 Pb 23.0 21.2 20.5 18.7 19.4 20.2 18.8 17.6 Zn 35.0 30.4 30.4 31.5 33.1 35.1 32.0 35.3 表 5 达布花岗闪长岩体与Ⅰ型花岗岩的矿物及化学成分特征对比
Table 5. Comparison of mineral and chemical composition characteristics between Dabu granodiorite and Ⅰ-type granite
矿物 Ⅰ型 达布矿区花岗闪长岩体 长英质矿物的差异 石英不太多,长石可呈粉红色 石英20%~25%,可见肉红色钾长石 常见铁镁矿物 黑云母Mg/Fe高,白云母较罕见 黑云母、角闪石(少) 不透明矿物 磁铁矿物±钛铁矿±黄铁矿物 黄铜矿±黄铁矿±磁铁矿±辉钼矿(多),钛铁矿±赤铁矿(少) SiO2含量 53%~76% 65.0%~67.8% Na2O含量 >3.2% 4.51%~4.82% K2O/ Na2O 低(<1) 0.50~0.65 A/CNK 低(<1.0),准铝质-过铝质 0.97~1.12,准铝质-弱过铝质 SiO2含量为66%时的CaO含量 >3.7% 1.72%~3.18% CIPW刚玉分子 <1% 1.71%~2.92% 包含岩类 花岗闪长岩-闪长岩 花岗闪长岩-石英二长岩 矿床 Cu-Mo-W Cu-Mo 注:Ⅰ型花岗岩据路凤香和桑隆康(2002)、桑隆康和马昌前(2012). 表 6 达布花岗闪长岩体与埃达克岩的地球化学特征对比
Table 6. Comparison of geochemical characteristics of the Dabu granodiorite and adakitic rocks
埃达克岩 达布矿区花岗闪长岩体 岩石组合 石英闪长岩、花岗闪长岩、英云闪长岩等 花岗闪长岩、石英二长岩 岩石系列 钙碱性 钙碱性 SiO2 ≥56 65.0~67.8 Al2O3 ≥15 15.6~16.5 MgO ≤3 1.37~1.57 Na2O 4± 4.51~4.82 K2O 1~2 2.41~2.94 K2O/Na2O <0.5 0.50~0.65 Mg# >47 39.6~47.2 Sr >400 751~915 Yb ≤1.9 0.64~0.89 Y ≤18 5.58~6.88 Sr/Y >20~40 124~144 (La/Yb)N >20 13.8~20.5 Eu/Eu* >1 1.02~1.27 注:主量元素单位为%;微量元素单位为10-6;埃达克岩数据据Defant and Drummond(1990). -
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