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1、第32卷第6期河南理工大學學報(自然科學版)Vo1.32NO.62013年12月JOURNALOFHENANP0LYTECHNICUNIVERSITY(NATURALSCIENCE)Dec.2013魯西南蒙陰盆地古近系沉積特征及沉積環(huán)境鄭德順,高林,李明龍,周璐,程涌,張飛鵬(1.河南理工大學資源環(huán)境學院河南焦作454000;2.湖北省第二地質大隊湖北恩施445000)摘要:運用沉積學和沉積地球化學方法對蒙陰盆地古近系進行了沉積特征及沉積環(huán)境演化研究,結果表明,蒙陰盆地常路組(E1“.E2ch)反映了河流和濱淺湖沉積環(huán)境,常一段的河流沉積較發(fā)育,常二
2、段以濱淺湖為主,有沼澤化含煤和黏土沉積,常三段為濱湖沉積;W(V)/w(V+Ni),W(Sr)/w(Ba),W(Mg)/w(Ca)等地球化學指標反映出常路組沉積時期雖總體處于水體弱分層的淡水環(huán)境,氣候濕潤,但存在小的波動,古鹽度與古水深呈顯著負相關關系,與蒙陰盆地古近紀封閉的山間盆地性質相吻合.此后的朱家溝組(E2zh)為常路組沉積后地形迅速抬升的山麓沖洪積體系.蒙陰盆地古近紀演化過程主要受太平洋板塊的俯沖影響而發(fā)生右行走滑的沂沭斷裂和蘭聊斷裂的活動控制.關鍵詞:沉積環(huán)境;地球化學;蒙陰盆地;古近系中圖分類號:P534.62文獻標識碼:A文章編號: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