Petrology, Geochemistry, Chronology and Geological Significance of Jiang Tso Ophiolite in Middle Segment of Bangonghu-Nujiang Suture Zone, Tibet
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摘要: 江错蛇绿岩位于班公湖-怒江缝合带中段, 位于切里湖蛇绿岩亚带的最东端, 南邻蓬湖西蛇绿岩.江错蛇绿岩岩石组合相对较全, 主要由变质橄榄岩、辉长岩和辉绿岩等组成.江错蛇绿岩辉长岩-辉绿岩与N-MORB相比具有较高的Mg#、低Ti、K、Na和P的特征, 富集大离子亲石元素Sr、Rb、Ba和亏损高场强元素Th、Hf、Ta、Nb, REE配分图总体显示为平坦型分布模式.通过地球化学元素分析认为江错蛇绿岩是形成于SSZ之上的弧后盆地扩张脊环境.对其进行辉长岩锆石SHRIMP U-Pb定年, 得出加权平均年龄为189.8±3.3 Ma(MSWD=0.97), 该结果代表了班公湖怒江缝合带中段江错地区特提斯洋的扩张时代, 与中段东巧地区蛇绿岩年龄一致, 但晚于东段洋盆发育时代且早于西段洋盆发育时代, 表明整个班公湖-怒江洋盆发育时代存在东早西晚的特点.
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关键词:
- 江错蛇绿岩 /
- 地球化学 /
- SHRIMP U-Pb定年 /
- 构造环境 /
- 西藏
Abstract: Jiang Tso ophiolite, which belongs to the most eastern part of Qieli Lake ophiolite subzone, is located at the middle segment of the Bangonghu-Nujiang suture zone to the south of Pung Lake ophiolite. The rock association of Jiang Tso ophiolite is relatively complete and mainly composed of metamorphic peridotite, gabbro and diabase. Comparing with N-MORB, the major and trace elements of Jiang Tso ophiolite are characterized with high content in Mg and low contents in Ti, K, Na, P and the depletion of elements of Nb, Ta, Hf, and Th. In addition, it displays relative enrichment of Rb, Sr, and Ba. Geochemistry characteristics of the Jiang Tso ophiolite indicate it is of supra-subduction zone type ophiolite and formed in the spreading ridge of back arc basin. The zircon SHRIMP U-Pb weighted average ages of gabbro is 189.8±3.3 Ma (MSWD=0.97), which suggests that the extension time of Tethys oceanic basin in Jiang Tso region was consistent with the formation time of the Dongqiao oceanic basin in the middle part, and also corresponding to that of the oceanic basin in the western part, while later than the development of oceanic basin in the eastern part of the Bangonghu-Nujiang suture zone. From the geochronological data, it can be deduced that the development of the Bangonghu-Nujiang oceanic basin was characterized by being gradually later from east to west.-
Key words:
- Jiang Tso ophiolite /
- geochemistry /
- SHRIMP U-Pb dating /
- tectonic environment /
- Tibet
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图 1 江错蛇绿岩地质构造简图
1.喜马拉雅被动陆缘(印度板块);2.雅鲁藏布缝合带;3.冈底斯陆缘火山-岩浆弧;4.拉萨地块;5.班公湖-怒江缝合带;6.羌塘地块;7.松潘地块;8.蛇绿岩;9.断层;10.湖泊;据夏斌等,1993;Yin and Harrison, 2000修改
Fig. 1. Geological sketch map of Jiang Tso ophiolite
表 1 班公湖-怒江缝合带内蛇绿岩典型剖面岩石组合、地球化学特征及构造环境统计
Table 1. The rock assemblage, geochemical characteristics and tectonic environment of typical ophiolite section in Bangonghu-Nujiang suture zone
剖面名称 岩石组合 化学特征 构造背景 文献 东段 丁青 丁青西:地幔橄榄岩、辉长岩、玄武岩;丁青东:地幔橄榄岩、堆晶岩、铁镁质杂岩 熔岩MORB;玻安岩;LAT 弧前环境 张旗和杨瑞英, 1985, 1987; Ishii et al., 1992; 张旗,1992;王建平等,2002 嘉黎-凯蒙 地幔橄榄岩、辉橄岩、橄长岩和辉长岩 SSZ型蛇绿岩 不成熟弧后盆地 和钟铧等,2006 中段 东巧 地幔橄榄岩、橄长岩、玄武岩及铬铁矿 MORB; E-MORB; SSZ; IAT 大洋盆地扩张环境 Girardeau et al., 1984;王希斌等,1984;杨瑞英等,1984;Pearce and Deng, 1988;叶培盛等,2004;夏斌等2008 安多 玄武岩、辉长岩 SSZ型蛇绿岩 弧后盆地环境 王希斌等,1984;赖绍聪和刘池阳,2003;孙立新等,2011 觉翁 变质橄榄岩、辉橄岩、堆晶岩、辉绿岩墙、枕状熔岩、放射虫硅质岩 MORB; SSZ 大洋盆地;弧后盆地 王希斌等,1984;陈玉禄等,2006 蓬湖西 纯橄岩、辉长岩、橄长岩 SSZ型蛇绿岩 弧后盆地环境 王希斌等,1984;韦振权,2009 纳木错 变质橄榄岩、辉长辉绿岩、玄武岩 IAT 弧后盆地环境 叶培盛等,2004 白拉 地幔橄榄岩、辉长岩、辉绿岩 玻安岩 弧前盆地 Pearce and Deng, 1988 拉弄 地幔橄榄岩、辉长岩、辉绿岩、枕状熔岩 SSZ型蛇绿岩 弧后盆地环境 徐力峰,2009 西段 洞错 地幔橄榄岩、堆晶杂岩、基性岩墙杂岩、基性熔岩 OIB; MORB; IAT 洋岛;小洋盆,初始洋盆,弧后盆地 林文弟等,1990;夏斌等,1991; 鲍佩声等, 1996, 2007; 鲍佩声和王军, 2000;张玉修等,2007;樊帅权等,2010 拉果错 地幔橄榄岩、堆晶岩、枕状熔岩、斜长花岗岩、放射虫硅质岩 IAT; MORB和IAT 弧间盆地 王保弟等,2007;张玉修等,2007 查尔康错 变质橄榄岩、堆晶岩、辉绿岩、玄武岩 MORB和IAT 岛弧环境 张玉修等,2007 班公错 地幔橄榄岩、辉长岩、辉绿岩墙、枕状熔岩 SSZ型蛇绿岩 俯冲带环境 史仁灯,2007;黄启帅等,2012a 狮泉河 地幔橄榄岩、堆晶岩、基性岩墙 IAT; MORB; SSZ 弧后盆地;洋内岛弧 郭铁鹰等,1991;史仁灯,2005 古昌 变质橄榄岩、基性岩墙群、蚀变玄武岩、斜长花岗岩、放射虫硅质岩 MORB; E-MORB 初始洋盆;多岛弧环境;异常洋脊环境 王希斌等,1987;张宽忠等,2007 表 2 江错蛇绿岩辉长岩、辉绿岩主量元素质量百分含量分析结果(%)
Table 2. Contents of major elements of gabbro and diabase from Jiang Tso
样品 7XJC1 7XJC2 7XJC3 7XJC7 7XJC4 7XJC5 7XJC6 岩性 辉长岩 辉长岩 辉长岩 辉长岩 辉绿岩 辉绿岩 辉绿岩 SiO2 49.47 50.25 50.07 46.50 47.81 48.45 46.10 TiO2 0.60 0.53 0.18 0.20 0.17 0.45 0.11 Al2O3 15.05 13.54 15.85 14.96 16.89 16.54 17.80 Fe2O3 8.09 10.10 4.73 7.84 5.94 5.64 3.74 MnO 0.08 0.11 0.08 0.12 0.08 0.09 0.07 MgO 11.09 9.89 11.25 13.88 12.05 9.86 10.74 CaO 10.53 11.39 10.86 12.35 10.58 15.55 19.37 Na2O 2.30 2.31 1.63 2.08 1.89 1.34 0.32 K2O 0.96 0.53 2.21 0.40 0.85 0.38 0.20 P2O5 0.04 0.06 0.02 0.06 0.01 0.04 0.01 LOI 1.49 0.99 2.86 1.24 3.54 1.34 1.28 Total 99.72 99.70 99.73 99.61 99.81 99.68 99.75 FeOt 7.28 9.09 4.26 7.05 5.34 5.07 3.37 Mg# 73.27 66.20 82.63 77.98 80.23 77.76 85.17 注:Mg#=100×Mg2+/(Mg2++Fe2+)(摩尔比);FeOt=FeO+0.9×Fe2O3. 表 3 江错蛇绿岩岩石微量(稀土)元素含量(10-6)及不相容元素比值
Table 3. Contents of trace (REE) elements of Jiang Tso ophiolite
样品号 7XJC1 7XJC2 7XJC3 7XJC7 7XJC4 7XJC5 7XJC6 Sc 43.11 39.91 45.84 43.38 33.93 32.67 25.56 Ti 3 270.60 2 922.50 1 110.00 1 208.90 975.90 2 487.40 663.90 V 227.00 276.00 134.50 140.90 114.30 153.80 75.63 Cr 513.90 438.30 498.40 1 406.70 296.00 1 004.00 1 570.10 Mn 625.60 909.20 659.60 989.20 590.80 671.00 576.80 Co 39.68 46.95 30.80 48.07 26.21 28.75 31.72 Ni 125.40 131.40 147.50 217.90 143.30 177.20 272.10 Cu 12.62 6.80 13.56 85.91 14.45 43.46 65.22 Zn 18.62 19.86 18.46 40.66 26.19 41.98 66.69 Ga 11.52 11.09 8.43 8.94 8.91 9.14 7.73 Ge 1.22 1.27 1.40 1.15 1.26 1.25 1.07 Rb 47.78 19.52 130.00 14.68 38.23 17.98 11.29 Sr 145.20 142.90 151.40 203.40 220.60 143.00 83.23 Y 13.32 13.09 6.73 5.77 6.94 8.59 2.83 Zr 21.04 18.89 12.33 3.02 7.79 12.95 3.61 Nb 0.94 0.75 0.45 0.20 0.75 0.76 0.17 Ba 23.50 20.03 101.50 61.25 38.67 36.39 34.87 La 1.24 1.54 0.93 0.47 1.14 1.10 0.43 Ce 3.19 3.72 2.37 1.16 3.27 2.80 0.97 Pr 0.54 0.62 0.40 0.21 0.56 0.48 0.15 Nd 2.99 3.21 2.06 1.30 2.82 2.56 0.84 Sm 1.10 1.13 0.67 0.48 0.82 0.83 0.28 Eu 0.43 0.49 0.28 0.31 0.40 0.40 0.16 Gd 1.57 1.58 0.94 0.76 1.09 1.17 0.39 Tb 0.32 0.33 0.18 0.16 0.19 0.22 0.07 Dy 2.19 2.21 1.15 1.09 1.32 1.50 0.53 Ho 0.49 0.50 0.26 0.25 0.28 0.33 0.11 Er 1.43 1.41 0.75 0.66 0.76 0.94 0.31 Tm 0.21 0.22 0.11 0.09 0.11 0.13 0.04 Yb 1.44 1.48 0.68 0.62 0.73 0.90 0.29 Lu 0.23 0.25 0.11 0.10 0.11 0.14 0.05 Hf 0.66 0.63 0.38 0.16 0.26 0.43 0.12 Ta 0.07 0.06 0.03 0.01 0.04 0.05 0.01 Pb 1.07 0.53 3.66 1.87 9.59 3.54 4.29 Th 0.03 0.04 0.09 0.01 0.08 0.05 0.02 U 0.02 0.05 0.02 0.03 0.02 0.07 0.08 LREE/HREE 1.20 1.34 1.61 1.05 1.96 1.53 1.58 Ce/Zr 0.15 0.20 0.19 0.38 0.42 0.22 0.27 Zr/Nb 22.38 25.19 27.40 15.10 10.39 17.04 21.24 Th/Yb 0.02 0.03 0.13 0.02 0.11 0.06 0.07 Zr/Y 1.58 1.44 1.83 0.52 1.12 1.51 1.28 Ti/Y 245.54 223.26 164.93 209.51 140.62 289.57 234.59 La/Nb 1.32 2.05 2.07 2.35 1.52 1.45 2.53 Y/Nb 14.17 17.45 14.96 28.85 9.25 11.30 16.65 Th/Ta 0.43 0.67 3.00 1.00 2.00 1.00 2.00 La/Ta 17.71 25.67 31.00 47.00 28.50 22.00 43.00 δEu 1.00 1.12 1.08 1.57 1.29 1.24 1.48 表 4 江错蛇绿岩中辉长岩SHRIMP锆石U-Pb分析结果
Table 4. SHRIMP zircon U-Pb age data of gabbro from Jiang Tso ophiolite
测点 U(μg/g) Th(μg/g) Th/U 206Pbc(%) 206Pb*(μg/g) 207Pb*/235U ±% 206Pb*/238U ±% 206Pb/238UAge(Ma) ±1σ JC1.1 86 62 0.74 6.01 2.4 0.37 39.8 0.030 2 4.2 191.7 7.9 JC2.1 184 205 1.15 1.11 4.7 0.35 13.3 0.029 6 2.2 188.1 4.1 JC3.1 163 79 0.50 3.96 4.3 0.28 30.8 0.029 7 2.8 189.0 5.2 JC5.1 200 159 0.82 3.02 5.2 0.25 23.0 0.029 4 2.9 187.1 5.3 JC6.1 322 438 1.41 1.66 8.1 0.23 16.0 0.029 0 2.2 184.0 3.9 JC7.1 114 82 0.74 6.80 3.3 0.43 31.9 0.031 5 3.5 199.7 6.9 JC8.1 115 110 0.99 10.74 3.1 0.19 77.6 0.028 0 4.1 178.0 7.3 JC10.1 516 3418 6.84 2.93 12.9 0.21 15.3 0.028 3 2.5 179.7 4.5 JC12.1 485 1021 2.18 3.95 13.0 0.32 34.2 0.029 9 2.2 190.1 4.1 JC13.1 181 156 0.89 7.29 5.3 0.20 38.3 0.031 5 3.1 200.1 6.1 JC15.1 172 173 1.04 6.43 4.8 0.23 40.3 0.030 2 2.9 191.9 5.5 注:206Pbc(%)为普通206Pb占总206Pb的百分比;Pb*为放射性成因铅;普通铅用204Pb校正. -
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