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  • 简介:Relativelyabundant17α(H)-diahopaneshavebeendetectedinthelowercretaceouslacustrinesourcerocksfromtheLishuFaultDepressionintheSongliaoBasinNortheastChina.Richlongchaintricyclicterpanes(carbonnumberuptoC35)andgammaceranehavebeenobservedinthosesourcerockswithrelativelyabundant17α(H)-diahopanes,whichisrarelyseeninpreviousreports.Inthispaper,theformationof17α(H)-diahopaneshasbeendiscussedfromthreeaspectsincludingmaturity,oxidation-reductionnatureofdepositionalenvironmentandparentmaterialcompositionbytheGC/MSanalyses.Theresultsrevealthatmaturityandoxidation-reductionnatureofdepositionalenvironmenthavelittleeffectontheformationof17α(H)-diahopanesintheinvestigatedarea.However,thepositivecorrelationbetweenlong-chaintricyclicterpanesand17α(H)-diahopanesarguesstronglyforacommonorigin,andtheoriginisrelatedtothealgaesinsalinewaterenvironment.Thealgaesinsalinewaterenvironmentmaybeakindoforiginof17α(H)-diahopanes.

  • 标签: 中国东北地区 湖相烃源岩 重排藿烷 梨树断陷 松辽盆地 下白垩统