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《川西甘孜-理塘构造带侏罗纪海相地层的特征.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第28卷第7期地质通报Vo1.28.NO.72009年7月GEoLoGICALBUIIETINoFCHINAJu1.,2009川西甘孜一理塘构造带侏罗纪海相地层的特征王全伟,戴宗明,阚泽忠,王康明,梁斌WANGQuan—weiI,DAIZong—ming1,KANZe—zhong,WANGKang—ming,LIANGBin21.四川省地质调查院,四川成都610081;2.西南科技大学环境与资源学院,四川绵阳6210001.SichuanGeologicalSurvey,Chengdu610081,Sichuan,China;2.
2、FacultyofEnvironmentandResource,SouthwestUniversityofScienceandTechnology,Mianyang621000,Sichuan,China摘要:在川西高原沿甘孜一理塘构造带新发现一套侏罗纪地层。厘定为立洲组和瑞环山组。立洲组由陆源碎屑岩和基性火山岩建造组成,属山间坳陷一河湖相一滨海相沉积环境;瑞环山组为浅海碳酸盐台地沉积环境。广泛发育包括含生物礁灰岩在内的碳酸盐岩建造。立洲组合植物孢粉化石,瑞环山组合丰富的珊瑚、水螅、层孔虫、腹足、苔藓、藻类等化石,自下而上可划分为
3、Verrucosisporitessp.一Punctatisporitessp..Thecosmiliacf.weben—Pyotethmosc£discus和Cladocoropsismirabilis一&/asp.三个生物组合带。以立洲组中的孢粉和柱状节理玄武岩(一法)194.8Ma的年龄值为依据,将该组的时代暂定为早一中侏罗世;瑞环山组生物化石丰富.其时代属晚侏罗世关键词:川西高原:甘孜一理塘构造带:侏罗纪地层中图分类号:P534.52文献标志码:A文章编号:1671-2552(2009)07-0907-07WangQW,D
4、aiZM,KanZZ,WangKM,LiangB.MarineJurassicstrataofGraze-Litangstructuralbeltinwes~rnSichuan,China.GeologicalBulletinofChina,2009,28(7):907-913Abstract:AsetofJurassicstratumalongGraze—LitangstructuralbeltinwesternSichuanplateauhasbeendiscoverednewly,andhasbeensetfortheLiz
5、houFormationandtheRuihuanshanFormation.TheLizhouFormationwasformedbytemgenousclasticrocks,basicvolcanicrocks,andbelongstothemountaindepression—fluvio—lacustrine—littoralsedimentaryenvironment.TheI~uihuanshanFormationbelongstoshallowmarinecarbonaterockmesasedimentaryen
6、vironmentw矧hreek.TheL~zhouFormationincludesplantspomle,andtheRuihuanshanFormationisabundantfossilsofcoral,hydra,stromatoporoids,pleopod,mOSSandalga.Frombotomtotop,thelattercanbedividedintothreebiologicassemblages:Verru~osisporitessp.一Punctatisporitessp.,Thecosmiliacf.
7、weberi一一otethmoscfdiscusandCladocoropsismirabilis—Bauneiasp..AccordingtothesporuleintherocksofLizhouFormationandtheageof194.8Maofbasalt(At—Armethod),itistentativelyscheduledfortheEady—MiddleJurassic.TheRuihuanshanFormationcontainsabundantbiolo·gicfossils,itserapertain
8、stoLateJurassic.Keywords:westernSichuanplateau;Graze—Litangstructuralbelt;Jurassicstratum近年来。四川省地质调查院在开展凉山州1:5乱,将其并人三叠系或二叠系[
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