| 江汉平原沉积物重矿物特征及其对三峡贯通的指示 |
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| 引用本文： | 康春国,李长安,王节涛,邵磊.江汉平原沉积物重矿物特征及其对三峡贯通的指示[J].地球科学,2009,34(3):419-427. |
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| 作者姓名： | 康春国 李长安 王节涛 邵磊 |
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| 作者单位： | 1.中国地质大学地球科学学院, 湖北武汉 430074 |
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| 基金项目： | 国家重点基础研究发展规划(973计划)，国家自然科学基金 |
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| 摘 要： | 江汉平原是长江穿过三峡区的第一个大型卸载盆地, 其沉积物必然反映长江流经的物源区的物源特征.通过对盆地中心周老孔第四纪岩心的重砂样品中0.125~0.063mm粒级的重矿物含量变化、ATi、GZi、ZTR指数和重矿物组合分析, 发现从钻孔岩心深度110m开始向上, 水动力条件加强, 沉积速率加快, 重矿物的数量特征发生明显突变, 特征矿物的组合与现代长江相同.表明在周老孔岩心深度110m (古地磁年龄1.1Ma左右) 位置处, 长江三峡开始贯通, 江汉平原开始接纳长江带来的三峡上游的物质.
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| 关 键 词： | 江汉平原 周老孔 第四纪沉积物 重矿物特征 三峡贯通 |
| 收稿时间： | 2008-12-13 |
Heavy Minerals Characteristics of Sediments in Jianghan Plain and Its Indication to the Forming of the Three Gorges |
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| KANG Chun-guo,LI Chang-an,WANG Jie-tao,SHAO Lei .Faculty of Earth Sciences,China University of Geosciences,Wuhan ,China .Harbin University,Harbin ,China.Heavy Minerals Characteristics of Sediments in Jianghan Plain and Its Indication to the Forming of the Three Gorges[J].Earth Science-Journal of China University of Geosciences,2009,34(3):419-427. |
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| Authors: | KANG Chun-guo LI Chang-an WANG Jie-tao SHAO Lei Faculty of Earth Sciences China University of Geosciences Wuhan China Harbin University Harbin China |
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| Institution: | KANG Chun-guo1,2,LI Chang-an1,WANG Jie-tao1,SHAO Lei1 1.Faculty of Earth Sciences,China University of Geosciences,Wuhan 430074,China 2.Harbin University,Harbin 150086,China |
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| Abstract: | Quaternary sediments in Jianghan Plain,the first large-scale offloading basin of the Yangtze River after the forming of Three Gorges,reflect the characteristics of provenance through which the Yangtze River flows.The heavy mineral samples were collected from the sand layer in the drilling core,with the size fraction ranging from 0.125 mm to 0.063 mm.We find that there is an obvious mutation of the combination and quantitative characteristics of heavy minerals at the depth of 110 m,with the paleomagnetic age... |
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| Keywords: | Jianghan Plain Zhoulao core Quaternary sediments characteristics of heavy minerals forming of the Three Gorges |
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