渤海东部旅大29-1构造沙二段砂砾岩锆石定年及物源示踪
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  • 英文篇名:Detrital Zircon U-Pb Geochronology of the Es_2 Sandstones of Lvda 29-1 Structure of the Eastern Bohai Sea,and Its Implication for Provenance
  • 作者:赵梦 ; 杜晓峰 ; 王清斌 ; 冯冲 ; 庞小军 ; 李欢
  • 英文作者:ZHAO Meng;DU XiaoFeng;WANG QingBin;FENG Chong;PANG XiaoJun;LI Huan;Bohai Oilfield Research Institute,China National Offshore Oil Corporation,Tianjin Branch;
  • 关键词:旅大29-1构造 ; 物源示踪 ; 碎屑锆石U-Pb年龄 ; 中元古界 ; 上元古界
  • 英文关键词:Lvda 29-1 Structure;;provenance;;detrital zircon U-Pb ages;;Mesoproterozoic;;Neoproterozoic
  • 中文刊名:CJXB
  • 英文刊名:Acta Sedimentologica Sinica
  • 机构:中海石油(中国)有限公司天津分公司渤海石油研究院;
  • 出版日期:2018-11-13 16:37
  • 出版单位:沉积学报
  • 年:2019
  • 期:v.37
  • 基金:国家科技重大专项(2016ZX05024003)~~
  • 语种:中文;
  • 页:CJXB201901006
  • 页数:10
  • CN:01
  • ISSN:62-1038/P
  • 分类号:65-74
摘要
为示踪辽东凹陷LD29-1构造沙二段(Es_2)砂岩沉积,对LD29-1-1、LD29-1-1Sa及LD29-1-2等3口井的沙二段砂岩6个岩屑样品进行了碎屑锆石U-Pb定年和锆石阴极发光(CL)图像分析。结果表明:LD29-1-1井样品中白垩纪(K)锆石含量高达41.2%,具有108 Ma峰值年龄,锆石柱状晶形完整,并且棱角明显;而LD29-1-1Sa及LD29-1-2井样品的中元古代(Pt_2)锆石含量高达74%~75%,中生代(Mz)锆石含量少,具有~1.5 Ga和~1.8 Ga双峰值特征,锆石晶体明显小于LD29-1-1井沉积物,并且晶形不完整、边缘均被磨圆。因此,认为LD29-1-1井沙二段砂岩为近源沉积,母岩为长兴岛凸起斜坡带中生界碎屑岩,而LD29-1-1Sa及LD29-1-2井沙二段砂体为远源沉积,母岩以辽东半岛西部复州地区广泛分布的中、上元古界沉积岩为主,在搬运至斜坡带时才混入少量中生界碎屑岩。
        To trace the sedimentary source-to-sink systems of the Lvda 29-1 structure in the eastern Bohai Sea,six sandstone cuttings of the second Member of Shahejie Formation( Es_2) were collected from LD29-1-1,LD29-1-1Sa and LD29-1-2 for detrital zircon U-Pb dating and cathodoluminescence( CL) image analysis. The results showed that the sandstones of LD29-1-1 contained 41.2% Cretaceous( K) zircons and featured a 108 Ma peak,and the columnar crystals were characterized by sharp edges. The LD29-1-1Sa and LD29-1-2 sandstones contained 74%-75% Mesoproterozoic( Pt2) zircons with peaks at ~1.5 Ga and ~1.8 Ga,and the broken crystals were well rounded. We concluded that the Es_2 sandstones of LD29-1-1 were near-source deposited,and the provenance was the Mesozoic sedimentary rocks along the slope of the Changxingdao Uplift; the Es_2 sandstones of LD29-1-1Sa and LD29-1-2 were distal from the source area and were dominated by the widespread Mesoproterozoic and Neoproterozoic sedimentary rocks exposed in Fuzhou on the western Liaodong Peninsula,with only a slight influence of Mesozoic sedimentary rocks from the slope of the Changxingdao Uplift.
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