岳保静, 廖晶. 黄河流域现代沉积物碎屑锆石U-Pb年龄物源探讨[J]. 海洋地质与第四纪地质, 2016, 36(5): 109-119. DOI: 10.16562/j.cnki.0256-1492.2016.05.011
引用本文: 岳保静, 廖晶. 黄河流域现代沉积物碎屑锆石U-Pb年龄物源探讨[J]. 海洋地质与第四纪地质, 2016, 36(5): 109-119. DOI: 10.16562/j.cnki.0256-1492.2016.05.011
YUE Baojing, LIAO Jing. PROVENANCE STUDY OF YELLOW RIVER SEDIMENTS BY U-Pb DATING OF THE DETRITAL ZIRCONS[J]. Marine Geology & Quaternary Geology, 2016, 36(5): 109-119. DOI: 10.16562/j.cnki.0256-1492.2016.05.011
Citation: YUE Baojing, LIAO Jing. PROVENANCE STUDY OF YELLOW RIVER SEDIMENTS BY U-Pb DATING OF THE DETRITAL ZIRCONS[J]. Marine Geology & Quaternary Geology, 2016, 36(5): 109-119. DOI: 10.16562/j.cnki.0256-1492.2016.05.011

黄河流域现代沉积物碎屑锆石U-Pb年龄物源探讨

PROVENANCE STUDY OF YELLOW RIVER SEDIMENTS BY U-Pb DATING OF THE DETRITAL ZIRCONS

  • 摘要: 在系统搜集与分析前人发表的现代黄河碎屑锆石U-Pb年龄及黄河流域内岩体锆石U-Pb年龄的基础上,对黄河上游到入海口6个站位及黄河支流2个站位现代沉积物样品碎屑锆石U-Pb年龄进行对比,结果发现200~350、350~500、700~1 000、1 000~1 800、1 800~2 000和2 000~2 600 Ma这6个年龄组是黄河流域沉积物U-Pb年龄的主要组成,其中又以200~350、350~500、1 800~2 000和2 000~2 600 Ma占主体,与黄河流域各可能物源区的U-Pb年龄对比,认为黄河上游物质主要来自松潘-甘孜造山带和很多近缘河水侵蚀的黄土,其可能源区包括华北板块、扬子板块、秦岭造山带、东昆仑造山带、柴达木板块北缘及祁连造山带,由于松潘-甘孜造山带和黄土高原黄土来源的复杂性其源区判别还需要借助其他指标加以确定,黄河中下游则有大量华北板块和大别-苏鲁造山带物质的加入。鉴于当前综合运用多种物源分析方法,对长江三角洲盆地若干钻孔地层研究取得的进展及黄河三角洲钻孔研究现状,提出对黄河三角洲钻孔沉积物开展精细物源示踪对黄河时空演化研究的重要性。

     

    Abstract: Six major U-Pb age groups of detrital zircons are recognized in the modern Yellow River sediments. They are 200~350 Ma、350~500 Ma、700~1 000 Ma、1 000~1 800 Ma、1 800~2 000 Ma and 2 000~2 600 Ma respectively with 200~350 Ma、350~500 Ma、1 800~2 000 Ma and 2 000~2 600 Ma dominating. By comparison of the U-Pb age patterns with the potential source areas of the Yellow River drainage basin, it is deduced that the upper reach sediments of the Yellow River are mainly derived from the Songpan-Ganzi block and the loess nearby transported by rivers. These clastic sediments might come from the North China Carton, the Yangtze Carton, the Qinling orogen, the East-Kunlun Orogenic Belt, the Qilian Terrane and the northern margin of the Qaidam basin. The deposits from the middle and lower Yellow River, however, show significant contribution from the North China Carton and the Sulu orogen. Learnt from the great progress achieved based on integrated provenance study of the Changjiang River delta by deep holes, we suggest similar approach being taken for high-resolution provenance analysis of the Yellow River Delta so as to reveal the spatio-temperal evolution of the river.

     

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