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地质力学学报:2021,27(2):304-316
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渤海钻孔物源示踪和河流沉积物扩散研究:碎屑锆石U-Pb年龄和磷灰石原位地球化学元素双重约束
(1.三峡大学土木与建筑学院, 湖北 宜昌 443002;2.天津大学地球系统科学学院, 天津 300072;3.中国地质科学院地质力学研究所, 北京 100081;4.中国地质大学 (武汉) 地球科学学院, 湖北 武汉 430074;5.东华理工大学地球科学学院, 江西 南昌 330013)
Study on borehole provenance tracing and fluvial sediment diffusion in the Bohai Sea: Double constraints from detrital zircon U-Pb age and in-situ geochemical element of apatite grains
(1.College of Civil Engineering and Architecture, Three Gorges University, Yichang 443002, Hubei, China;2.School of Earth System Science, Tianjin University, Tianjin 300072, China;3.Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China;4.School of Earth Sciences, China University of Geosciences(Wuhan), Wuhan 430074, Hubei, China;5.School of Earth Sciences, East China University of Technology, Nanchang 330013, Jiangxi, China)
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投稿时间:2020-07-09    修订日期:2020-09-15
中文摘要: 锆石和磷灰石是河流沉积物中常见的副矿物,由于各自的U-Pb年龄组成和原位地球化学元素组成在不同区域内存在显著差异,是进行河流物源示踪研究的理想矿物。基于此,利用在环渤海湾盆地主要汇入河流已发表的碎屑锆石U-Pb年龄,结合盆地晚第四纪钻孔的近地表碎屑物质的锆石U-Pb年龄,综合Kolmogorov-Smirnov统计方法的多维判别图(MDS),系统对比分析了辽东湾、渤海中央盆地和莱州湾的物质来源。结果显示,辽东湾的物质主要来自辽河;渤海中央盆地和莱州湾的碎屑物质主要来自黄河。同时,利用激光剥蚀电感耦合等离子质谱仪(LA-ICP-MS),对黄河下游(n=70)、胶东半岛的威海湾(n=120)、银滩湾(n=60)的现代河流沉积物和海岸砂开展了碎屑磷灰石微区原位(in situ)主微量元素分析。结果发现黄河与威海湾、银滩湾的碎屑物质不存在物源关系,结合该区域碎屑钾长石原位主微量元素的已有分析结果,进一步说明黄河与胶东半岛的海湾内的碎屑物质不存在物源关系。新的研究结果表明,将碎屑锆石、磷灰石原位地球化学分析相结合有助于更精准地判定河流的物源关系。
中文关键词: 渤海  胶东半岛  锆石  U-Pb年龄  磷灰石  物源示踪
Abstract:Bohai Bay Basin, located in the North China Craton, are surrounded by the Yanshan Mountains to the north, the Taihang Mountains to the west, the Jiaodong and Liaodong peninsulas to the south and east, respectively. The Yellow River, combined with the Liaohe, Luanhe and Haihe rivers, produces a huge amount of detrital sediments to the Bohai Bay Basin each year. However, it has not been clear whether the sediments have been transported to the Bohai Sea and the gulf of Jiaodong Peninsula. In addition, there is no definite result suggesting that these sediments are related to the provenance in the gulf of Jiaodong Peninsula. Zircon and apatite are common accessory minerals in the river sediments. The zircon U-Pb age and the in-situ geochemical data of apatite grains show significant differences in different regions, making them the ideal minerals for the provenance study. In this case, we used the published detrital zircon U-Pb ages from the major inflow rivers of the Bohai Bay Basin, combining with the drilling cores zircon U-Pb ages and integrating with the multi-dimensional identification (MDS) of kolmogorov-smirnov statistical method, to systematically identify the potential source areas in the Liaodong Bay, Bohai Central Basin and Laizhou Bay. The results show that the detrital sediments in the Liaodong Bay mainly came from the Liaohe River, while that in the Bohai Central Basin and Laizhou Bay from the Yellow River. The Yellow River plays a major role in the material composition of the central and western parts of the Bohai Sea. At the same time, we carried out the laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) on the detrital apatite grains from the lower reaches of the Yellow River (n=70), and the Weihai Bay (n=120) and Yintan Bay (n=60) from the Jiaodong Peninsula. The results show that there is no provenance relationship between them. Combined with the in-situ geochemical analysis results of detrital K-feldspar in this area, it further indicates that there is no provenance relationship between the Yellow River and the gulf of Jiaodong Peninsula. Therefore, the combination of in-situ geochemical analysis of detrital zircon and apatite helps to accurately determine the provenance relationship.
文章编号:     中图分类号:P534.63    文献标志码:
基金项目:国家自然科学基金(41702178,41972212)
引用文本:
林旭,刘静,吴中海,等,2021.渤海钻孔物源示踪和河流沉积物扩散研究:碎屑锆石U-Pb年龄和磷灰石原位地球化学元素双重约束[J].地质力学学报,27(2):304-316.DOI:10.12090/j.issn.1006-6616.2021.27.02.028
LIN Xu,LIU Jing,WU Zhonghai,et al,2021.Study on borehole provenance tracing and fluvial sediment diffusion in the Bohai Sea: Double constraints from detrital zircon U-Pb age and in-situ geochemical element of apatite grains[J].Journal of Geomechanics,27(2):304-316.DOI:10.12090/j.issn.1006-6616.2021.27.02.028

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