| 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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| 引用本文： | 赵梦,杜晓峰,王清斌,冯冲,庞小军,李欢.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[J].沉积学报,2019,37(1):62-71. |
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| 作者姓名： | 赵梦 杜晓峰 王清斌 冯冲 庞小军 李欢 |
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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;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;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;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;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;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： | 国家科技重大专项（2016ZX05024003） |
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| 摘 要： | 为示踪辽东凹陷LD29-1构造沙二段（Es2）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（Pt2）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。
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| 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 |
| 收稿时间： | 2018-04-23 |
Detrital Zircon U-Pb Geochronology of the Es2 Sandstones of Lvda 29-1 Structure of the Eastern Bohai Sea,and Its Implication for Provenance |
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| Institution: | Bohai Oilfield Research Institute, China National Offshore Oil Corporation, Tianjin Branch, Tianjin 300459, China |
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| Abstract: | 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 (Es2) 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 Es2 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 Es2 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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