本文選題：早白堊世 + 甘肅玉門��； 參考：《中國地質(zhì)大學(xué)(北京)》2017年碩士論文

【摘要】：玉門紅柳峽地區(qū)陸相中生界發(fā)育,自下而上劃分為赤金堡組、下溝組和中溝組。對(duì)這套的陸相中生界時(shí)代爭(zhēng)議很大,具體有晚侏羅世、晚侏羅世至早白堊世、早白堊世等不同認(rèn)識(shí)。本研究在玉門紅柳峽地區(qū)下溝組和中溝組獲得了大量保存完好的雙殼類化石,為進(jìn)一步確定地層時(shí)代奠定了基礎(chǔ)。經(jīng)鑒定,下溝組雙殼類化石計(jì)有7屬23種,包括Musculiopsis fuxinensis,M.yixianensis,M.yumenensis,M.subrotundus,M.trigonicus,M.gansuensis,Sphaerium anderssoni,S.coreanicum,S.pujiangense,S.selenginensis,S.chientaoense,S.ellipticoides,Gansuella angulate,G.xinminpuensis,G.subrotunda,Nakamuranaia chingshanensis,N.subrotunda,N.aff.chingshanensis,Arguniella lingyuanensis,A.yanshanensis,A.liaoxiensis,Inversidens wuerheensis和Unio yanbianensis。據(jù)此建立Nakamuranaia subrotunda-Musculiopsis fuxinensis組合。中溝組雙殼類化石計(jì)2屬4種,包括M.subrotundus,M.gansuensis,S.pujiangense和S.anderssoni。玉門紅柳峽下溝組和中溝組內(nèi)的雙殼類化石分子可以與浙江西部、遼寧西部、黑龍江東部及韓國東南部、外貝加爾東部、日本西南部早白堊世中Aptian—早Albian期雙殼類動(dòng)物群形成良好對(duì)比。結(jié)合下溝組上段火山頸相火山巖鋯石年齡(109±1.6Ma),基本能夠確定下溝組—中溝組時(shí)代為早白堊世中Aptian期—Albian期。
[Abstract]:The continental Mesozoic is developed in Hongliuxia area of Yumen, which is divided into Chijinbao formation, Xiagou formation and Zhonggou formation from bottom to top.The continental Mesozoic epoch is controversial, including the late Jurassic, the late Jurassic to the early Cretaceous, and the early Cretaceous.In this study, a large number of well-preserved bivalve fossils were obtained in Xiagou formation and Zhonggou formation in Hongliuxia area, Yumen, which laid a foundation for further determining the stratigraphic age.緇忛壌瀹，

本文編號(hào)：1772652