Establishment of Upper Jurassic Duiwangshan Formation in Duobuza area, Gerze County, Tibet, and its significance
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摘要:
对望山组是发育在羌南板块南缘的一套岩石组合，以安山岩、流纹岩、玄武质凝灰岩为主，有少量的玄武安山岩夹层，具有明显的岩浆喷出相和沉积相韵律分布的特点。利用LA-ICP-MS同位素定年技术对对望山组安山岩中的锆石进行了U-Pb同位素测年，获得锆石的206Pb/238U年龄加权平均值为150.5±0.6Ma，表明对望山组的形成时代为晚侏罗世中晚期，在详细剖面测制和区域对比的基础上建立了对望山组。对望山组的建立对完善班公湖-怒江缝合带的地层系统、探讨班公湖-怒江洋的晚侏罗世构造演化具有重要的地质意义。
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关键词:
- 青藏高原 /
- 羌塘 /
- 对望山组 /
- 晚侏罗世 /
- LA-ICP-MS锆石U-Pb测年
Abstract:The Duiwangshan Formation is a rock assemblage developed in the south of Qiangtang plate and consists of andesite, liparite, basaltic tuff and minor basaltic andesite interlayer. It has obvious rhythm distribution characteristics between extrusive facies and sedimentary facies of magma. Conducting LA-ICP-MS U-Pb dating, the authors obtained andesite average 206Pb/238U age of 150.5±0.6Ma, which indicates Duiwangshan Formation should have been formed in middle-late period of Late Jurassic. The Late Jurassic Duiwangshan Formation was established based on the detailed section measurement and regional correlation, which has important geological significance for the completion of the stratigraphic system in Bangong Co-Nujiang Suture Zone (BANSZ) and the study of tectonic evolution of Bangong Co-Nujiang Ocean in Late Jurassic.
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Keywords:
- Tibetan Plateau /
- Qiangtang /
- Duiwangshan Formation /
- Late Jurassic /
- LA-ICP-MS zircon U-Pb ages
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致谢: 吉林大学徐锋、解超明老师和许伟硕士在论文撰写期间提供帮助，中国地质大学（北京）实验测试中心的老师和同学在实验过程中给予帮助，在此一并表示感谢。
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图 1 西藏改则县对望山地区地质图
1—第四纪冲洪积物；2—上白垩统阿布山组；3—下白垩统去申拉组；4—下白垩统美日切错组一段；5—下白垩统美日切错组二段；6—下白垩统美日切错组三段；7—上侏罗统对望山组第一旋回；8—上侏罗统对望山组第二旋回；9—上侏罗统对望山组第三旋回；10—上侏罗统对望山组第四旋回；11—下侏罗统曲色组一段；12—下侏罗统曲色组二段；13—早白垩世石英斑岩；14—堆晶辉长岩；15—主干断层；16—不整合接触；17—整合接触；18—剖面位置；BNSZ—班公湖-怒江缝合带；LSSZ—龙木措-双湖-澜沧江缝合带
Figure 1. Geological map of Duiwangshan area, Gerze County, Tibet
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图 3 对望山组安山岩（DT13T5）锆石U-Pb谐和图
Figure 3. U-Pb concordia diagram of the zircon from andesite of Duiwangshan Formation
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图 4 对望山组安山岩（DT13T5）典型锆石阴极发光（CL）图像
Figure 4. CL images of the zircons separated from the andesite of Duiwangshan Formation
未见底 上侏罗统第四旋回（J3d4） 462.1m 16. 紫褐色安山岩，长石斑晶占80% 208.5m 15. 土黄褐色流纹岩，流动构造明显 38.5m 14. 青灰色安山岩，发育气孔构造，同位素定年为 150Ma 144.9m 13. 紫红色流纹质熔结凝灰岩 70.2m 上侏罗统第三旋回（J3d3） 496.2m 12. 浅粉色安山岩 104.4m 11. 浅肉红色流纹岩，可见流动构造 69.7m 10. 紫红色安山岩 321.7m 9. 砖红色-紫褐色安山质岩屑晶屑熔结凝灰岩夹层 0.4m 上侏罗统第二旋回（J3d2） 728.6m 8. 浅灰褐色安山岩 106.4m 7. 灰褐色玄武岩，镜下观察矿物主要为长石，含量40% 36.9m 6. 浅灰褐色安山岩 66m 5. 紫黑色玄武安山岩 6.2m 4. 红褐色条纹状流纹岩 125m 3. 灰褐色玄武质火山凝灰岩，气孔中可见石英充填 388.1m 上侏罗统第一旋回（J3d1） 285.2m 2. 紫褐色流纹岩，气孔杏仁构造明显 141.9m 1. 紫红色安山岩 143.3m 未见顶 
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表 1 西藏改则县对望山组安山岩（DT13T5）LA-ICP-MS锆石U-Th-Pb同位素分析结果
Table 1 LA-ICP-MS zircon U-Th-Pb isotopic analyses of Duiwangshan andesite in Gaize County, Tibet
测点号 含量/10-6 Th/U 同位素比值 年龄/Ma Th U Pb 207Pb/206Pb 207Pb/235U 206Pb/238U 207Pb/206Pb 207Pb/235U Pb/206U238 DT13T5-01 104 238 5.91 0.44 0.04892±0.00311 0.1534±0.0095 0.02275±0.00043 144±106 145±8 145±3 DT13T5-02 125 155 4.40 0.81 0.04901±0.00460 0.1628±0.0151 0.02410±0.00048 148±171 153±13 154±3 DT13T5-03 155 216 5.83 0.72 0.04896±0.00333 0.1547±0.0104 0.02291±0.00043 146±116 146±9 146±3 DT13T5-04 97.7 130 3.57 0.75 0.04906±0.00470 0.1592±0.0151 0.02353±0.00048 151±174 150±13 150±3 DT13T5-05 249 273 7.94 0.91 0.04910±0.00330 0.1605±0.0106 0.02371±0.00041 153±118 151±9 151±3 DT13T5-06 168 245 6.54 0.69 0.04898±0.00324 0.1548±0.0101 0.02292±0.00040 147±115 146±9 146±3 DT13T5-07 211 247 7.05 0.85 0.04901±0.00386 0.1606±0.0125 0.02376±0.00042 148±142 151±11 151±3 DT13T5-08 170 272 7.39 0.63 0.04915±0.00310 0.1622±0.0101 0.02393±0.00042 155±109 153±9 152±3 DT13T5-09 174 182 5.19 0.96 0.04902±0.00391 0.1565±0.0123 0.02310±0.00045 149±140 148±11 148±3 DT13T5-10 372 319 9.81 1.17 0.04911±0.00322 0.1599±0.0104 0.02362±0.00041 153±114 151±9 150±3 DT13T5-11 129 158 4.38 0.82 0.04913±0.00399 0.1592±0.0127 0.02350±0.00046 154±143 150±11 150±3 DT13T5-12 158 211 5.86 0.75 0.04908±0.00388 0.1608±0.0125 0.02376±0.00047 152±138 151±11 151±3 DT13T5-13 125 160 4.41 0.78 0.04900±0.00539 0.1592±0.0173 0.02355±0.00048 148±207 150±15 150±3 DT13T5-14 290 274 8.24 1.06 0.04905±0.02990 0.1636±0.0098 0.02418±0.00044 150±103 154±9 154±3 DT13T5-15 163 209 6.06 0.78 0.04905±0.00389 0.1650±0.0129 0.02440±0.00045 150±142 155±11 155±3 DT13T5-16 148 208 5.78 0.71 0.04903±0.00366 0.1611±0.0118 0.02382±0.00045 149±131 152±10 152±3 DT13T5-17 144 177 5.11 0.81 0.04913±0.00494 0.1651±0.0164 0.02437±0.00050 154±185 155±14 155±3 DT13T5-18 278 281 7.99 0.99 0.04894±0.00344 0.1539±0.0106 0.02280±0.00043 145±121 145±9 145±3 DT13T5-19 180 198 5.79 0.91 0.04913±0.00385 0.1628±0.0125 0.02403±0.00046 154±138 153±11 153±3 DT13T5-20 180 222 6.10 0.81 0.04910±0.00340 0.1580±0.0110 0.02333±0.00043 153±123 149±10 149±3 DT13T5-21 266 290 8.52 0.92 0.04913±0.00344 0.1643±0.0113 0.02425±0.00044 154±122 154±10 154±3
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杜德道, 曲晓明, 王根厚, 等.西藏班公湖-怒江缝合带西段中特提斯洋盆的双向俯冲:来自岛弧型花岗岩锆石U-Pb年龄和元素地球化学的证据[J].岩石学报, 2011, 27(7):1993-2002. http://www.cqvip.com/qk/94579x/201107/38831401.html 曲晓明, 辛洪波, 杜德道, 等.西藏班公湖-怒江缝合带中段A-型花岗岩的岩浆源区与板片断离[J].地质学报, 2013, 87(6):759-772. http://d.wanfangdata.com.cn/Periodical/dizhixb201306002 潘桂棠, 朱弟成, 王立全, 等.班公湖-怒江缝合带作为冈瓦纳大陆北界的地质地球物理证据[J].地学前缘, 2004, 11(4):371-382. http://d.wanfangdata.com.cn/Periodical/dxqy200404004 蒋光武, 谢尧武, 白珍平, 等.青藏高原班公湖-怒江缝合带丁青-碧土段大地构造演化[J].地质通报, 2009, 28(9):1259-1266. http://dzhtb.cgs.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20090914&journal_id=gbc 常青松.西藏羌塘地块南缘热那错火山岩的岩石学、年代学和地球化学[D].中国地质大学(北京)硕士学位论文, 2012. Copeland P,Harrison T M,Pan Y,et al.Thermal evolution of the Gangdese batholith,southern Tibet:A history of episodic unroofing[J].Tectonics,1995,14(2):223-236. doi: 10.1029/94TC01676 Copeland P, Harrison T M, Pan Y, et al.Thermal evolution of the Gangdese batholith, southern Tibet:A history of episodic unroofing[J].Tectonics, 1995, 14(2):223-236. doi: 10.1029/94TC01676
Allmendinger R W,Jordan T E,Suzanne M K,et al.The Evolution of the Altiplano-Puna Plateau of the Central Andes[J].Annual Review of Earth&Planetary Sciences,1997,25(1):139-174. https://www.researchgate.net/publication/234148990_The_evolution_of_the_Altiplano-Puna_Plateau_of_the_Central_Andes Allmendinger R W, Jordan T E, Suzanne M K, et al.The Evolution of the Altiplano-Puna Plateau of the Central Andes[J].Annual Review of Earth&Planetary Sciences, 1997, 25(1):139-174. https://www.researchgate.net/publication/234148990_The_evolution_of_the_Altiplano-Puna_Plateau_of_the_Central_Andes
朱弟成, 莫宣学, 赵志丹, 等.西藏冈底斯带措勤地区则弄群火山岩锆石U-Pb年代学格架及构造意义[J].岩石学报, 2008, 24(3):401-412. http://d.wanfangdata.com.cn/Periodical/ysxb98200803001 朱弟成, 夏瑛, 裘碧波, 等.为什么要提出西藏东南部早白垩世措美大火成岩省[J].岩石学报, 2013, 29(11):3659-3670. http://www.cnki.com.cn/Article/CJFDTOTAL-YSXB201311001.htm 常青松, 朱弟成, 赵志丹, 等.西藏羌塘南缘热那错早白垩世流纹岩锆石U-Pb年代学和Hf同位素及其意义[J].岩石学报, 2011, 27(7):2034-2044. http://d.wanfangdata.com.cn/Periodical/ysxb98201107012 Li S M,Zhu D C,Wang Q,et al.Northward subduction of Bangong-Nujiang Tethys:Insight from Late Jurassic intrusive rocks from BangongTso in western Tibet[J].Lithos,2014,205(9):284-297. https://www.researchgate.net/profile/Di-Cheng_Zhu/publication/264124028_Northward_subduction_of_Bangong-Nujiang_Tethys_Insight_from_Late_Jurassic_intrusive_rocks_from_Bangong_Tso_in_western_Tibet/links/53e4c0a10cf25d674e94e571.pdf?disableCoverPage=true Li S M, Zhu D C, Wang Q, et al.Northward subduction of Bangong-Nujiang Tethys:Insight from Late Jurassic intrusive rocks from BangongTso in western Tibet[J].Lithos, 2014, 205(9):284-297. https://www.researchgate.net/profile/Di-Cheng_Zhu/publication/264124028_Northward_subduction_of_Bangong-Nujiang_Tethys_Insight_from_Late_Jurassic_intrusive_rocks_from_Bangong_Tso_in_western_Tibet/links/53e4c0a10cf25d674e94e571.pdf?disableCoverPage=true
许荣科, 郑有业, 赵平甲, 等.西藏东巧北尕苍见岛弧的厘定及地质意义[J].中国地质, 2007, 34(5):768-777. http://www.cnki.com.cn/Article/CJFDTOTAL-DIZI200705002.htm 孙振明.西藏班-怒成矿带西段多龙矿集区铜金成矿作用与成矿规律[D].吉林大学博士学位论文, 2015. http://cdmd.cnki.com.cn/article/cdmd-10183-1015593147.htm 王勤, 张志, 宋俊龙, 等.西藏改则县多龙矿集区美日切错组地球化学特征及构造背景分析[J].矿物学报, 2013, S2:840-841. http://www.cnki.com.cn/Article/CJFDTOTAL-KWXB2013S2467.htm 孙兴国, 冯道永, 粟登逵, 等.西藏班公湖带铁格隆南超大型斑岩铜(金)矿床的勘查突破及区域找矿意义[J].中国地质, 2014, 4:1314-1327. http://d.wanfangdata.com.cn/Periodical/zgdizhi201404022 周金胜, 孟祥金, 臧文栓, 等.西藏青草山斑岩铜金矿含矿斑岩锆石U-Pb年代学、微量元素地球化学及地质意义[J].岩石学报, 2013, 29(11):3755-3766. http://d.wanfangdata.com.cn/Periodical/ysxb98201311009 全国地层委员会.中国区域年代地层(地质年代)表说明书[M].北京:地质出版社, 2002. Yuan H L,Gao S,Liu X M,et al.Accurate U-Pb age and trace element determinations of zircon by laser ablation inductively coupled plasma mass spectrometry[J].Geostandards and Geoanalytical Research,2004,28(3):353-370. doi: 10.1111/ggr.2004.28.issue-3 Yuan H L, Gao S, Liu X M, et al.Accurate U-Pb age and trace element determinations of zircon by laser ablation inductively coupled plasma mass spectrometry[J].Geostandards and Geoanalytical Research, 2004, 28(3):353-370. doi: 10.1111/ggr.2004.28.issue-3
Anderson T.Correction of common lead in U-Pb analyses that do not report 204Pb[J].Chemical Geology,2002,193(1/2):59-79. http://www.sciencedirect.com/science/article/pii/S000925410200195X Anderson T.Correction of common lead in U-Pb analyses that do not report 204Pb[J].Chemical Geology, 2002, 193(1/2):59-79. http://www.sciencedirect.com/science/article/pii/S000925410200195X
Ludwig K R.Isoplot/Ex version 3.00:A Geochronology Toolkit for Microsoft Excel[M].Berkeley Geochronology Center Special Publication,2003,4:1-70. Ludwig K R.Isoplot/Ex version 3.00:A Geochronology Toolkit for Microsoft Excel[M].Berkeley Geochronology Center Special Publication, 2003, 4:1-70.
Wiedenbeck M,Alle P,Corfu F,et al.Three natural zircon standards for U-Th-Pb,Lu-Hf,trace element and REE analyses[J].Geostandards Newsletter,1995,19(1):1-23. doi: 10.1111/ggr.1995.19.issue-1 Wiedenbeck M, Alle P, Corfu F, et al.Three natural zircon standards for U-Th-Pb, Lu-Hf, trace element and REE analyses[J].Geostandards Newsletter, 1995, 19(1):1-23. doi: 10.1111/ggr.1995.19.issue-1
于红.陕西商南松树沟橄榄岩矿物地球化学特征及成因机理示踪[D].中国地质大学(北京)硕士学位论文, 2011. http://cdmd.cnki.com.cn/article/cdmd-11415-1011078082.htm 张天羽, 李才, 苏犁, 等.藏北羌塘中部日湾茶卡地区堆晶岩LAICP-MS锆石U-Pb年龄、地球化学特征及其构造意义[J].地质通报, 2014, 33(11):1662-1672. http://dzhtb.cgs.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20141102&journal_id=gbc Liu Y S,Hu Z C,Zong K Q,et al.Reappraisement and refinement of zircon U-Pb isotope and trace element analyses by LAICP-MS[J].Chinese Science Bulletin,2010,1(15):1077-1077. doi: 10.1007/s11434-010-3052-4 Liu Y S, Hu Z C, Zong K Q, et al.Reappraisement and refinement of zircon U-Pb isotope and trace element analyses by LAICP-MS[J].Chinese Science Bulletin, 2010, 1(15):1077-1077. doi: 10.1007/s11434-010-3052-4
李长民.锆石成因矿物学与锆石微区定年综述[J].地质调查与研究, 2009, 33(3):161-174. http://www.cnki.com.cn/Article/CJFDTOTAL-QHWJ200903004.htm 吴元保, 郑永飞.锆石成因矿物学研究及其对U-Pb年龄解释的制约[J].科学通报, 200, 49(16):1589-1604. http://d.wanfangdata.com.cn/Periodical/kxtb200416002 祝向平, 陈华安, 刘鸿飞, 等.西藏多不杂斑岩铜矿斑岩锆石UPb年龄、岩石地球化学特征及其成矿意义[J].地质学报, 2015, 89(3):534-548. http://www.cnki.com.cn/Article/CJFDTOTAL-DZXE201503008.htm 祝向平, 陈华安, 刘鸿飞, 等.西藏拿若斑岩铜金矿床成矿斑岩年代学、岩石化学特征及其成矿意义[J].地质学报, 2015, 89(1):109-128. http://www.cnki.com.cn/Article/CJFDTOTAL-DZXE201501009.htm 胡隽, 万永文, 陶专, 等.班公湖-怒江缝合带西段特提斯洋盆南向俯冲的地球化学和年代学证据[J].成都理工大学学报(自然科学版), 2014, 4:505-515. http://d.wanfangdata.com.cn/Periodical/cdlgxyxb201404014 四川地质调查院.中华人民共和国1: 25万物玛幅区域地质调查报告. 2006. 吉林大学地质调查研究院.西藏改则多不扎1:5万4幅区域地质调查报告. 2016.
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