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世界地质 2021, 40(4) 743-758 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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基础地质 |
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昌宁-孟连构造带 “前寒武纪”变沉积岩年代学及其地质意义 |
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白雪瑞,董永胜,陈卓,贾人懿 |
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吉林大学 地球科学学院,长春 130061 |
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摘要:
滇西昌宁-孟连构造带内广泛出露 “前寒武纪”变沉积岩系,由于其时代存在争议,制约了该区特提斯洋演化的研究。笔者对上述变沉积岩系进行了碎屑锆石年代学测试分析,结果表明,变沉积岩系所包括的澜沧群、大勐龙群、崇山群、勐统群和西盟群,其碎屑锆石最年轻峰值年龄分别为516Ma、444Ma、440Ma、594Ma和 504Ma。结合前人对各群内火山岩夹层、侵入其中的岩浆侵入体年代学数据资料以及与晚古生代层序地层的角度不整合接触关系等,确定其原岩沉积时代均为早古生代;其中澜沧群、勐统群和西盟群的沉积物质来源于保山地块,大勐龙群和崇山群物质来源于思茅地块,其伴随原特提斯洋俯冲消亡遭受了变质变形改造,滇西地区存在与原特提斯洋闭合相关的早古生代末造山作用。 |
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关键词:
昌宁-孟连构造带
“前寒武纪”变沉积岩系
碎屑锆石年代学
特提斯洋
早古生代造山作用
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Geochronology of “Precambrian” meta-sedimentary rocks in Changning-Menglian tectonic belt and its geological significanc |
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BAIXuerui,DONGYongsheng,CHENZhuo,JIARenyi |
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CollegeofEarthSciences,JilinUniversity,Changchun130061,China |
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Abstract:
ThePrecambrianmetasedimentaryrockseries,whichwerewidelyexposedintheChangningMengliantectonicbeltinwesternYunnan,controversyontheagesoftheserocksseriouslyrestrictstheunderstandingoftheTethysoceanevolution.Inthispaper,theabovementionedmetasedimentaryrockserieshasbeentested andanalyzedbydetritalzircon.TheresultsshowthattheyoungestpeakagesofdetritalzirconsoftheLancang Group,DamenglongGroup,ChongshanGroup,MengtongGroupandXimengGroupincludedinthemetasedimentaryrockseriesare516Ma,444Ma,440Ma,594Ma,504Ma,respectively.Associatedwiththepreviouschronologicaldataofthevolcanicinterlayersineachgroupandmagmaticintrusionswithintheseries,andtheangularunconformitybetweentheLatePaleozoicsequenceandtheseries,thispapersuggeststhattheprotolithofthe PrecambrianmetasedimentaryrocksaredepositedintheEarlyPaleozoic,andtheirprovenancesarederivedfromdifferentblocksinwesternYunnan,ie.theLancangGroup,MengtongGroupandXimengGrouparefromtheBaoshanBlock.theDamenglongGroupandChongshanGrouparefromtheSimaoBlock.AlongwiththesubductionandextinctionoftheprotoTethysOcean,theysufferedmetamorphoseddeformedtransformation.Consequently,theauthorssupposethatthelateEarlyPaleozoicorogenyisalsoexsitedinwesternYunnanwhichisrelatedtothe closureoftheprotoTethysOcean |
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Keywords:
ChangningMengliantectonicbelt
Precambrianmetasedimentaryrockseries
detritalzircon chronology
TethysOcean
EarlyPaleozoicorogeny
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