石臼坨凸起西南陡坡带扇三角洲锆石定年与源汇示踪 |
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引用本文: | 赵梦,徐长贵,杜晓峰,王清斌.石臼坨凸起西南陡坡带扇三角洲锆石定年与源汇示踪[J].地球科学,2017,42(11):1984-1993. |
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作者姓名: | 赵梦 徐长贵 杜晓峰 王清斌 |
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作者单位: | 中海石油(中国)有限公司天津分公司渤海石油研究院, 天津 300459 |
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基金项目: | 国家"十三五"科技重大专项2016ZX05024003 |
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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152 Ma或168 Ma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.
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关 键 词: | 物源示踪 碎屑锆石U-Pb年龄 白垩系义县组 侏罗系蓝旗组 石臼坨凸起 沉积 石油地质 |
收稿时间: | 2017-02-17 |
Detrital Zircon U-Pb Geochronology and Provenance Tracing of the Fan Deltas along the Southwestern Slope of the Shijiutuo Uplift |
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Abstract: | To trace sedimentary Source-to-Sink systems of the southwestern Shijiutuo uplift, Bohai bay basin, 6 sandstone cuttings from 3 fan deltas of the third member of Dongying Formation (Ed3), along the southwestern slope of Shijiutuo uplift, were systematically sampled for detrital zircon U-Pb dating analysis in this study. It is found that sediments of the western fan delta (C6-4-4) were characterized with abundant Cretaceous zircons and a notable peak at 110 Ma, controlled by volcanic rocks of Cretaceous Yixian Formation. The sediments of the middle fan delta (C6-4-3, C6-4-6D) and the eastern fan delta (C6-4-5D) were characterized by high percentage of Jurassic zircons and a 152 Ma or 168 Ma peak, dominated by volcanic rocks of Jurassic Lanqi Formation, while their Paleozoic zircons derived from the Mesozoic sedimentary rocks. Moreover, all the samples received Archean-Proterozoic zircons from the exposed basement. This study shows that all the source strata can be traced by detrital zircon U-Pb dating except for the Paleozoic carbonate. The diversity of the provenances of the fan deltas was controlled by the inclination of the source strata:as the Mesozoic strata inclined to northwest, the Cretaceous strata dominated the western fan delta while the Jurassic strata controlled the middle and eastern fan deltas. |
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