滇西北石鼓变质杂岩的地质特征及年代学研究
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摘要
位于扬子板块西缘的滇西北石鼓变质杂岩主要岩石类型为石英二云片岩、斜长片麻岩、片麻岩、石榴子石云母片岩、石榴石蓝晶石云母片岩等。综合石鼓变质岩岩相学、野外地质和岩石地球化学特征,认为其原岩主要为一套砂质、泥砂质的杂砂岩,含少量的黏土物质。通过4件年龄样品的LA-ICPMS锆石U-Pb测年,显示其变质年龄为863～883Ma,是元古代晚期变质作用的年龄,原岩应为中元古宙变质基底。石鼓变质岩的原岩沉积环境为活动大陆边缘、大陆岛弧。发生在晚元古时期的区域变质作用,应为扬子陆块周缘向扬子陆块俯冲碰撞所致,可能与Rodinia超大陆的形成和裂解过程有关。
The metamorphic complex in Shigu area,Yulong County,northwest of Yunnan Province,is mainly composed of two-mica schist quartz schist,plagioclase gneiss,gneiss and garnet mica schist.The result of the study indicated,by systemic research of petrography,field geology and geochemistry,that the protolith of the Shigu complex is a suite of sand stone,greywacke and a small amount of clay materials.The time got by LA-ICP-MS zircon U-Pb dating of four samples from Shigu metamorphic complex is 863-883 Ma,being the age of metamorphism in Late Proterozoic,suggested that the rocks should be the sedimentary products of Mesoproterozoic.The original rock sedimentary environment or tectonic setting of the Shigu complex might be active continental margin to continental arc.The regional metamorphism that occurred in Late Proterozoic,might caused by the subduction collision of the edge part of Yangtze block to the main Yangtze block during the formation of Rodinia supercontinent.
The metamorphic complex in Shigu area,Yulong County,northwest of Yunnan Province,is mainly composed of two-mica schist quartz schist,plagioclase gneiss,gneiss and garnet mica schist.The result of the study indicated,by systemic research of petrography,field geology and geochemistry,that the protolith of the Shigu complex is a suite of sand stone,greywacke and a small amount of clay materials.The time got by LA-ICP-MS zircon U-Pb dating of four samples from Shigu metamorphic complex is 863-883 Ma,being the age of metamorphism in Late Proterozoic,suggested that the rocks should be the sedimentary products of Mesoproterozoic.The original rock sedimentary environment or tectonic setting of the Shigu complex might be active continental margin to continental arc.The regional metamorphism that occurred in Late Proterozoic,might caused by the subduction collision of the edge part of Yangtze block to the main Yangtze block during the formation of Rodinia supercontinent.
引文
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[23]BHATIA M R.Plate tectonics and geochemical composition of sand-stones[J].J.Geol.,1983,91(6):611-627.
[24]BHATIA M R.CROOK KEITH A W.Trace element characteristics of graywacks and tectonic setting discrimination of sedimentary basins[J].Contrib.Mineral.Petrol.,1986,92(2):181-193.
[25]戚学祥,朱路华,李化启,等.青藏高原东缘哀牢山-金沙江构造带糜棱状花岗岩的LA-ICP-MS U-Pb定年及其构造意义[J].地质学报,2010,84(3):357-369.
[26]王冬兵,唐渊,廖世勇,等.滇西哀牢山变质岩系锆石U-Pb定年及其地质意义[J].岩石学报,2013,29(4):1261-1278.
[2]范承钧.云南哀牢山构造变质带[J].云南地质,1986,5(4):281-291.
[3]李昆琼.滇西北石鼓片岩变质变形特征及其划分[J].云南地质,2003,22(3):329-335.
[4]翟明国,从柏林,乔广生,等.云南滇西造山带变质岩的Sm-Nd和Rb-Sr同位素年代学[J].岩石学报,1990,6(4):1-11.
[5]翟明国,从柏林.对于点苍山-石鼓变质带区域划分的意见[J].岩石学报,1993,9(3):227-239.
[6]从柏林,吴根耀,张旗,等.中国滇西古特提斯构造带岩石大地构造演化[J].中国科学:B辑化学生命科学地学,1993,23(11):1201-1207.
[7]任纪舜,姜春潮,张正坤,等.中国大地构造及其演化[M].北京:科学出版社,1980.
[8]李宝龙,季建清,付孝悦,等.滇西点苍山-哀牢山变质岩系变质时限研究[J].岩石学报,2009,25(3):595-608.
[9]李宝龙,季建清,付孝悦,等.滇西点苍山-哀牢山变质岩系锆石SHRIMP定年及其地质意义[J].岩石学报,2008,24(10):2322-2330.
[10]刘俊来,王安建,曹淑云,等.滇西点苍山杂岩中混合岩的地质年代学分析及其区域构造内涵[J].岩石学报,2008,24(3):413-420.
[11]沙绍礼.滇西石鼓变质带基本特征[J].岩石学报1989(1):78-83,97.
[12]TAPPONNIER P,LACASSIN R,LELOUP P H,et al.The Ailao Shan/Red River metamorphic belt:Tertiary left-lateral shear between Indochina and South China[J].Nature,1990,343:431-437.
[13]邓尚贤,王江海,朱炳泉.云南苍山变质带前寒武纪正变质岩的地球化学特征及其形成时代[J].地球化学,2001,30(2):147-154.
[14]崔军文.哀牢山变质岩的原岩建造及其构造意义[J].中国区域地质,1987(4):349-358.
[15]曹淑云.滇西点苍山高温糜棱岩显微构造和流动机制研究[D].北京:中国地质大学(北京),2007.
[16]HU Z C,GAO S,LIU Y S,et al.Signal enhancement in laser ablation ICP-MS by addition of nitrogen in the central channel gas[J].Journal of Analytical Atomic Spectrometry,2008,23(8):1093-1101.
[17]LIU Y S,HU Z C,GAO S,et al.In situ analysis of major and trace elements of anhydrous minerals by LA-ICP-MS without applying an internal standard[J].Chemical Geology,2008,257(1/2):34-43.
[18]LIU Y S,GAO S,HU Z C,et al.Continental and oceanic crust recycling-induced melt-peridotite interactions in the TransNorth China Orogen:U-Pb dating,Hf isotopes and trace elements in zircons of mantle xenoliths[J].Journal of Petrology,2010,51(1/2):537-571.
[19]LIU Y S,HU Z C,ZONG K Q,et al.Reappraisement and refinement of zircon U-Pb isotope and trace element analyses by LA-ICP-MS[J].Chinese Science Bulletin,2010,55(15):1535-1546.
[20]CONDIE K C.Chemical composition and evolution of the upper continental crust:Contrasting results from surface samples and shales[J].Chem Geol,1993,104(1/4):1-37.
[21]ROSER B P,KORSCH R J.Determination of tectonic setting of sandstone-mudstone suitesusing SiO2content and K2O/Na2O ratio[J].J.Geol.,1986,94:635-650.
[22]HERRON M M.Geochemical classification of terrigenous sands and shales from core or log data[J].J.Sediment Petrol,1988,58(5):820-829.
[23]BHATIA M R.Plate tectonics and geochemical composition of sand-stones[J].J.Geol.,1983,91(6):611-627.
[24]BHATIA M R.CROOK KEITH A W.Trace element characteristics of graywacks and tectonic setting discrimination of sedimentary basins[J].Contrib.Mineral.Petrol.,1986,92(2):181-193.
[25]戚学祥,朱路华,李化启,等.青藏高原东缘哀牢山-金沙江构造带糜棱状花岗岩的LA-ICP-MS U-Pb定年及其构造意义[J].地质学报,2010,84(3):357-369.
[26]王冬兵,唐渊,廖世勇,等.滇西哀牢山变质岩系锆石U-Pb定年及其地质意义[J].岩石学报,2013,29(4):1261-1278.
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