石臼坨凸起西南陡坡帶扇三角洲鋯石定年與源匯示蹤
發(fā)布時(shí)間:2019-07-09 20:40
【摘要】:為了示蹤渤海灣盆地石臼坨凸起西南陡坡帶扇三角洲源匯體系,對(duì)其東三段層序(Ed3)的6個(gè)砂巖樣品進(jìn)行碎屑鋯石U-Pb定年分析.西部扇體(C6-4-4井)富含白堊紀(jì)(K)鋯石并具有110 Ma峰值,母巖以白堊系義縣組火成巖為主;中部(C6-4-3、C6-4-6D井)、東部扇體(C6-4-5D)富含侏羅紀(jì)(J)鋯石并具有152Ma或168Ma峰值,母巖以侏羅系藍(lán)旗組火成巖為主,古生代(Pz)鋯石則來自中生界碎屑巖.所有樣品都含有太古代(Ar)、元古代(Pt)鋯石,母巖為花崗巖基底.研究表明,除古生界碳酸鹽巖外,源區(qū)的母巖地層均可通過碎屑鋯石U-Pb年齡示蹤,各扇體物源的差異性是由母巖地層傾向控制的,由于中生界向西北傾斜,白堊系主控西部扇體沉積,侏羅系則是中部、東部扇體的主要物源區(qū).
文內(nèi)圖片:
圖片說明:圖2各井位東三段巖性及取樣位置示意Fig.2TheEd3lithologyofthewellsandtheirsampledepth紅色星號(hào)為取樣位置
[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,
本文編號(hào):2512434
文內(nèi)圖片:
圖片說明:圖2各井位東三段巖性及取樣位置示意Fig.2TheEd3lithologyofthewellsandtheirsampledepth紅色星號(hào)為取樣位置
[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,
本文編號(hào):2512434
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