石臼坨凸起西南陡坡带扇三角洲锆石定年与源汇示踪
发布时间:2019-07-09 20:40
【摘要】:为了示踪渤海湾盆地石臼坨凸起西南陡坡带扇三角洲源汇体系,对其东三段层序(Ed3)的6个砂岩样品进行碎屑锆石U-Pb定年分析.西部扇体(C6-4-4井)富含白垩纪(K)锆石并具有110 Ma峰值,母岩以白垩系义县组火成岩为主;中部(C6-4-3、C6-4-6D井)、东部扇体(C6-4-5D)富含侏罗纪(J)锆石并具有152Ma或168Ma峰值,母岩以侏罗系蓝旗组火成岩为主,古生代(Pz)锆石则来自中生界碎屑岩.所有样品都含有太古代(Ar)、元古代(Pt)锆石,母岩为花岗岩基底.研究表明,除古生界碳酸盐岩外,源区的母岩地层均可通过碎屑锆石U-Pb年龄示踪,各扇体物源的差异性是由母岩地层倾向控制的,由于中生界向西北倾斜,白垩系主控西部扇体沉积,侏罗系则是中部、东部扇体的主要物源区.
文内图片:
图片说明:图2各井位东三段岩性及取样位置示意Fig.2TheEd3lithologyofthewellsandtheirsampledepth红色星号为取样位置
[Abstract]:In order to trace the fan Delta source and sink system in the southwest steep slope belt of Shijiutuo uplift in Bohai Bay Basin, six sandstone samples of the third member sequence (Ed3) in the east of Bohai Bay Basin were analyzed by clastic zircon U-Pb dating. The western sector (well C _ 6 鈮,
本文编号:2512434
文内图片:
图片说明:图2各井位东三段岩性及取样位置示意Fig.2TheEd3lithologyofthewellsandtheirsampledepth红色星号为取样位置
[Abstract]:In order to trace the fan Delta source and sink system in the southwest steep slope belt of Shijiutuo uplift in Bohai Bay Basin, six sandstone samples of the third member sequence (Ed3) in the east of Bohai Bay Basin were analyzed by clastic zircon U-Pb dating. The western sector (well C _ 6 鈮,
本文编号:2512434
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