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时间:2020-06-03
《鲁西南蒙阴盆地古近系沉积特征及沉积环境.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32卷第6期河南理工大学学报(自然科学版)Vo1.32NO.62013年12月JOURNALOFHENANP0LYTECHNICUNIVERSITY(NATURALSCIENCE)Dec.2013鲁西南蒙阴盆地古近系沉积特征及沉积环境郑德顺,高林,李明龙,周璐,程涌,张飞鹏(1.河南理工大学资源环境学院河南焦作454000;2.湖北省第二地质大队湖北恩施445000)摘要:运用沉积学和沉积地球化学方法对蒙阴盆地古近系进行了沉积特征及沉积环境演化研究,结果表明,蒙阴盆地常路组(E1“.E2ch)反映了河流和滨浅湖沉积环境,常一段的河流沉积较发育,常二
2、段以滨浅湖为主,有沼泽化含煤和黏土沉积,常三段为滨湖沉积;W(V)/w(V+Ni),W(Sr)/w(Ba),W(Mg)/w(Ca)等地球化学指标反映出常路组沉积时期虽总体处于水体弱分层的淡水环境,气候湿润,但存在小的波动,古盐度与古水深呈显著负相关关系,与蒙阴盆地古近纪封闭的山间盆地性质相吻合.此后的朱家沟组(E2zh)为常路组沉积后地形迅速抬升的山麓冲洪积体系.蒙阴盆地古近纪演化过程主要受太平洋板块的俯冲影响而发生右行走滑的沂沭断裂和兰聊断裂的活动控制.关键词:沉积环境;地球化学;蒙阴盆地;古近系中图分类号:P534.62文献标识码:A文章编号:1
3、673.9787(2013)06.0696-07AnalysisonsedimentarycharacteristicsandenvironmentsofPaleogeneinMengyinbasin,southwesternShandongprovinceZHENGDes.hun,GAOLin,LIMing.1ong,ZHOULu,CHENGYong,ZHANGFei.peng(1.SchoolofResourcesandEnvironment,HenanPolytechnicUniversity,Jiaozuo454000,Henan,China
4、;2.No.2GeologicalBrigadeofHubeiProv—ince,Enshi445000,Hubei,China)Abstract:ResearchesonpaleogeneofMengYinBasinweremainlyconcentratedinstratigraphicdivisionandcorrelation,andfewinasedimentaryenvironment.Thesedimentarycharacteristicsandenvironmentsofpaleo—genearestudiedusingthemet
5、hodsofsedimentologyandgeochemistry.Theresultsshowthat:ChangLuf0rma-tioninMengyinbasin(E1“一E2ch)isdevelopedwiththefluvialandshore-shallowlacustrinefacies,andChang一1memberismainlydevelopedwithfluvialdeposits;memberChang-2iswithshore—shallowlacustrinefacieswithswampingcoal-bearing
6、claydepositsandChang一3memberiswithfloodinglakeshoredeposit.Thegeochemicalindicatorssuchasw(V)/w(V+Ni),W(Sr)/w(Ba),W(Mg)/w(Ca)showthatthedepositsofChangLuformationwasmainlyunderahumidclimateandafreshwaterenvironment,existingsmallfluctua—tions.Therewasasignificantnegativecorrelat
7、ionbetweenpaleosalinityandwaterdepth,asMengyinbasinwasaclosedintermountainbasinduringPaleogene.TheZhujiagouformation(E2zh)belongstothesedi—mentsofpiedmontalluvialfanwithorographicupliftafterChangLuperiod.TheevolutionofMengyinbasinduringPaleogenewascontrolledbythedextralstrike—s
8、lipoftheYishufaultandLanliaofault,withthesflbduc-tiono
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