| 江汉盆地东部第四纪钻孔地层与沉积环境 |
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| 引用本文： | 顾延生,管硕,马腾,朱宗敏,刘红叶,郭森,余舒琪.江汉盆地东部第四纪钻孔地层与沉积环境[J].地球科学,2018,43(11):3989-4000. |
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| 作者姓名： | 顾延生 管硕 马腾 朱宗敏 刘红叶 郭森 余舒琪 |
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| 作者单位： | 1.中国地质大学生物地质与环境地质国家重点实验室, 湖北武汉 430074 |
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| 基金项目： | 中国地质调查局项目12120114069301国家自然科学基金项目41572153 |
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| 摘 要： | 为深刻理解江汉盆地第四纪新构造运动、气候变化与盆地沉积响应的关联，利用沔阳凹陷区第四纪典型钻孔样品进行系统岩石学、年代学与沉积学研究，首次建立了盆地东部沉积中心区可对比的地层序列.利用岩性、粒度、磁组构分析重建了研究区140万年以来依次经历的河流相、河湖交替相、湖相、河湖交替相、湖相、泛滥平原相演化过程.区域构造、沉积、气候资料综合对比表明，响应于新构造沉降，江汉盆地第四纪以来存在3大成湖期，即Qp2/Qp1之交、Qp3与Qh中后期（古云梦泽），其中MIS3以来古湖发育是新构造沉降与异常强盛夏季风的耦合，且湖相沉积的独特环境为盆地高砷地下水的形成提供了重要的物质条件.不仅为第四纪钻孔地层划分对比提供可靠基础资料，也为盆地地下资源调查与环境规划保护提供重要参考.
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| 关 键 词： | 江汉盆地 第四纪 钻孔地层 沉积响应 新构造运动 气候变化 |
| 收稿时间： | 2018-08-04 |
Quaternary Sedimentary Environment Documented by Borehole Stratigraphical Records in Eastern Jianghan Basin |
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| Abstract: | In order to explore the further relationship among the Quaternary neotectonic movement, climate change and sedimentary response in the Jianghan basin, a systematic study of lithology, geochronology and sedimentology was carried out using typical Quaternary boreholes in the Mianyang depression in the eastern part of the basin. A comparable sequence of Quaternary borehole strata was first established in the deposition center of the eastern Jianghan basin. A complete sedimentary evolution history of the river facies, alternation of river and lacustrine facies, lacustrine facies, alternation of river and lacustrine facies, lacustrine facies and floodplain facies was reconstructed in turn in the past 140 ka based on lithology, grain size and magnetic fabric analysis. The integrated analysis of regional tectonic movement, sedimentary evolution and climatic change shows that there occurred 3 periods of lacustrine deposition including the transition of Qp2/Qp1, Qp3, and mid-late Holocene (ancient Yunmeng lakes), respectively. Our results demonstrate that the development of paleolake since the MIS3 is related to the coupling of neotectonic subsidence and extremely strong summer monsoon. The unique environment of lacustrine deposition provides important material conditions for the formation of high-arsenic groundwater in the basin. This study not only provides reliable basic data for the stratigraphic division and correlation of Quaternary boreholes in the Jianghan basin, but also provides an important reference for underground resources investigation and environmental planning and protection. |
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