哈密苦水蛇绿混杂岩带岩石化学、年代学特征及地质意义
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摘要
苦水蛇绿混杂岩是近年来在苦水地区从老地层命名中解体而来,混杂岩中蚀变辉绿岩、玄武岩的主微量元素的测试结果显示,轻稀土LREE略富集,重稀土Yb、Lu略亏损,(La/Sm)_N值为0. 79～0. 92,(La/Yb)_N=1.45～1.73,具有洋中脊玄武岩的特征,在Ti-Zr图解判别中,为洋中脊玄武岩(MORB),综合认为区内玄武岩应形成于洋脊环境。辉长岩的LA-ICP-MS锆石U-Pb年龄测定结果为(336.3±2.3)Ma,谐和图密集,结合该区前人年代学和区域地质调查等资料,认为苦水蛇绿混杂岩的时代下限为石炭纪,与同一构造带中的鄯善县康古尔塔格蛇绿岩代表了同一个洋盆——康古尔洋,且洋盆存在的时限可能比较长,早古生代就发育有古洋盆。
Kushui ophiolitic melange is disintegrated from the old strata in Kushui area in recent years. The main micro-test results of basalt and altered diabase in the melange show that LREE is slightly enriched, Yb and Lu are slightly depleted,(La/Sm)_N is 0.79-0.92,(La/Yb)_N is 1.45-1.73, and it has the characteristics of mid-oceanic ridge basalt. In Ti-Zr diagram, it is distinguished as mid-oceanic ridge basalt. The LA-ICP-MS zircon U-Pb dating of gabbro is 336.3 ±2.3 Ma, which is dense in harmony map. Combined with the data of previous chronology and regional geological survey, it is considered that the lower age limit of Kushui ophiolitic melange is Carboniferous and Kangguertage ophiolite in the same tectonic belt. The Kangguertage ophiolite in Shanshanxian County represents the same ocean Basin-the Kanggultag Ocean, and the existence time of the ocean basin may be relatively long. The ancient ocean basin was developed in the Early Paleozoic.
Kushui ophiolitic melange is disintegrated from the old strata in Kushui area in recent years. The main micro-test results of basalt and altered diabase in the melange show that LREE is slightly enriched, Yb and Lu are slightly depleted,(La/Sm)_N is 0.79-0.92,(La/Yb)_N is 1.45-1.73, and it has the characteristics of mid-oceanic ridge basalt. In Ti-Zr diagram, it is distinguished as mid-oceanic ridge basalt. The LA-ICP-MS zircon U-Pb dating of gabbro is 336.3 ±2.3 Ma, which is dense in harmony map. Combined with the data of previous chronology and regional geological survey, it is considered that the lower age limit of Kushui ophiolitic melange is Carboniferous and Kangguertage ophiolite in the same tectonic belt. The Kangguertage ophiolite in Shanshanxian County represents the same ocean Basin-the Kanggultag Ocean, and the existence time of the ocean basin may be relatively long. The ancient ocean basin was developed in the Early Paleozoic.
引文
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李锦轶.2004.新疆东部新元古代晚期和古生代构造格局及其演变[J].地质论评,(03):304-322.
李瑞保,裴先治,李佐臣,裴磊,陈国超,刘成军,陈有炘,刘战庆.2014.东昆仑南缘布青山构造混杂带哥日卓托洋岛玄武岩地球化学特征及构造意义[J].地学前缘,21(01):183-195.
李文铅,董富荣,周汝洪.2000.新疆鄯善康古尔塔格蛇绿杂岩的发现及其特征[J].新疆地质,2000(02):121-128.
李文铅,马华东,王冉,王核,夏斌.2008.东天山康古尔塔格蛇绿岩SHRIMP年龄、Nd-Sr同位素特征及构造意义[J].岩石学报,24(04):773-780.
李文铅,夏斌,吴国干,王核,王冉.2005.新疆鄯善康古尔塔格蛇绿岩及其大地构造意义[J].岩石学报,(06):1617-1632.
刘崴国,张建东,赵恒乐.2016.新疆东天山雅满苏东大沟洋壳残片地质特征及年代学讨论[J].西部探矿工程,28(06):130-133.
罗婷,廖群安,陈继平,张雄华,郭东宝,胡兆初.2012.东天山雅满苏组火山岩LA-ICP-MS锆石U-Pb定年及其地质意义[J].地球科学(中国地质大学学报),37(06):1338-1352.
孟繁聪,张建新,杨经绥,许志琴.2003.柴北缘锡铁山榴辉岩的地球化学特征[J].岩石学报,(03):435-442.
王超,陈斌,马星华,鄢雪龙.2015.东天山三岔口地区早、晚古生代岩体成因及其对康古尔缝合带演化的意义[J].地球科学与环境学报,37(05):52-70.
王华星,胡志军,李铁,刘振涛,李兵.2009.哈密地区苦水构造混杂岩带地质特征及其意义[J].陕西地质,2009,27(01):43-55.
王金荣,陈万峰,张旗,焦守涛,杨婧,潘振杰,王淑华.2017.N-MORB和E-MORB数据挖掘——玄武岩判别图及洋中脊源区地幔性质的讨论[J].岩石学报,33(03):993-1005.
王雯,夏芳,柴凤梅,吴生军,李强,耿新霞,孟庆鹏.2016.东天山石炭纪雅满苏组火山岩特征及地质意义[J].岩石矿物学杂志,2016,35(05):768-790.
新疆地矿局区调大队.1961.1:20万沙泉子幅(K-46-ⅩⅩⅢ幅)报告[R].
新疆地质调查院,新疆地矿局第一区域地质调查大队.2012.1:25万雅满苏镇幅(L45C003003)地质调查报告[R].
杨朝.2015.全球早古生代造山带:板块重建与古大陆[D].青岛:中国海洋大学.
杨兴科,陶洪祥,罗桂昌,姬金生.1996.东天山板块构造基本特征[J].新疆地质,(03):221-227.
中国地质科学院,2002.新疆地矿局第一区域地质调查大队.东天山地区构造格架研究报告[R].2002
周作侠.1990.中国及邻区蛇绿岩套分布及其地质意义[J].地质与勘探,1990,(1):11-21.
Liu Y S, Hu Z C, Gao S, Gunther D, Xu J, Gao C G, Chen H H.2008. In situ analysis of major and trace elements of anhydrous minerals by LA-ICP-MS without applying an internalstandard[J].Chemical Geology 257,34-43.
Liu Y S, Gao S, Hu Z C, Gao C G, Zong K Q, Wang D B, 2010.Continental and oceanic crust recycling induced melt peridotite interactions in the Trans-North China Orogen:U-Pb dating, Hf isotopes and trace elements in zircons of mantle xenoli[J].Journal of Petrology,51:537-571.
Ludwig K R. 2003.ISOPLOT3.00:A Geochronolog-ical Toolkit for Microsoft Excel[R]. Berkeley Geochronology Center,California, Berkel-ey,39.
Pidgeon R T,Nemchin A A,Hitchen G]. 1998. Internal structures of zircons from Archaean granites from the Darling Range batholith:lmplicationa for zircon stability and the interpretation of zircon U-Pb ages[J]. Contributions to Mineralogy and Petrology, 132(3):288-299.
Three natural zircon standards for U-Th-Pb Lu-Hf,trace element and REE analyses[J]. Geostandards Newsletter, 19(1):1-24.
Vavra G, Schmid R,Gebauer D. 1999.Internal morphology, habitand UTh-Pb microanaly-sis of amphibole-to-granulite facies zircons:geochronology of the Ivren zone(Southern Alps)[J].Mineralogy and Petrology, 134(4):380-404.
Wiedenbeck M,Alle P,Corfu F,et al. 1995.曹荣龙.1994.新疆北部蛇绿岩及基性-超基性杂岩[J].新疆地质,1994(01):25-31.
陈隽璐,徐学义,王宗起,闫全人,王洪亮,曾佐勋,李平.2008.西秦岭太白地区岩湾-鹦鸽咀蛇绿混杂岩的地质特征及形成时代[J].地质通报,(04):500-509.
董连慧,朱志新,屈迅,王克卓,赵同阳.2010.新疆蛇绿岩带的分布、特征及研究新进展[J].岩石学报,26(10):2894-2904.
河北省区域地质矿产调查研究所.2009.新疆哈密市雅满苏一带1:5万(K46E012016、K46E012017、K46E013016、K46E013017幅)战略性矿产远景调查报告.
姬金生,杨兴科,苏生瑞.1994.东天山康古尔塔格金矿带成矿条件分析[J].地质找矿论丛,1994(04):49-56.
李锦轶,王克卓,李文铅,郭华春,宋彪,王瑜,莫申国,赵子然,朱志新,潘成泽.2002.东天山晚古生代以来大地构造与矿产勘查[J].新疆地质,(04):295-301.
李锦轶.2004.新疆东部新元古代晚期和古生代构造格局及其演变[J].地质论评,(03):304-322.
李瑞保,裴先治,李佐臣,裴磊,陈国超,刘成军,陈有炘,刘战庆.2014.东昆仑南缘布青山构造混杂带哥日卓托洋岛玄武岩地球化学特征及构造意义[J].地学前缘,21(01):183-195.
李文铅,董富荣,周汝洪.2000.新疆鄯善康古尔塔格蛇绿杂岩的发现及其特征[J].新疆地质,2000(02):121-128.
李文铅,马华东,王冉,王核,夏斌.2008.东天山康古尔塔格蛇绿岩SHRIMP年龄、Nd-Sr同位素特征及构造意义[J].岩石学报,24(04):773-780.
李文铅,夏斌,吴国干,王核,王冉.2005.新疆鄯善康古尔塔格蛇绿岩及其大地构造意义[J].岩石学报,(06):1617-1632.
刘崴国,张建东,赵恒乐.2016.新疆东天山雅满苏东大沟洋壳残片地质特征及年代学讨论[J].西部探矿工程,28(06):130-133.
罗婷,廖群安,陈继平,张雄华,郭东宝,胡兆初.2012.东天山雅满苏组火山岩LA-ICP-MS锆石U-Pb定年及其地质意义[J].地球科学(中国地质大学学报),37(06):1338-1352.
孟繁聪,张建新,杨经绥,许志琴.2003.柴北缘锡铁山榴辉岩的地球化学特征[J].岩石学报,(03):435-442.
王超,陈斌,马星华,鄢雪龙.2015.东天山三岔口地区早、晚古生代岩体成因及其对康古尔缝合带演化的意义[J].地球科学与环境学报,37(05):52-70.
王华星,胡志军,李铁,刘振涛,李兵.2009.哈密地区苦水构造混杂岩带地质特征及其意义[J].陕西地质,2009,27(01):43-55.
王金荣,陈万峰,张旗,焦守涛,杨婧,潘振杰,王淑华.2017.N-MORB和E-MORB数据挖掘——玄武岩判别图及洋中脊源区地幔性质的讨论[J].岩石学报,33(03):993-1005.
王雯,夏芳,柴凤梅,吴生军,李强,耿新霞,孟庆鹏.2016.东天山石炭纪雅满苏组火山岩特征及地质意义[J].岩石矿物学杂志,2016,35(05):768-790.
新疆地矿局区调大队.1961.1:20万沙泉子幅(K-46-ⅩⅩⅢ幅)报告[R].
新疆地质调查院,新疆地矿局第一区域地质调查大队.2012.1:25万雅满苏镇幅(L45C003003)地质调查报告[R].
杨朝.2015.全球早古生代造山带:板块重建与古大陆[D].青岛:中国海洋大学.
杨兴科,陶洪祥,罗桂昌,姬金生.1996.东天山板块构造基本特征[J].新疆地质,(03):221-227.
中国地质科学院,2002.新疆地矿局第一区域地质调查大队.东天山地区构造格架研究报告[R].2002
周作侠.1990.中国及邻区蛇绿岩套分布及其地质意义[J].地质与勘探,1990,(1):11-21.