柴达木盆地成盐期与青藏高原第四纪冰期及构造运动阶段的相关性

发布时间：2019-03-04 12:25

【摘要】：柴达木盆地沉积有巨厚的晚新生代沉积物和丰富的矿产资源,是研究晚新生代以来气候与环境变化、构造运动与盆地演化、成盐成矿规律的理想地区。通过对柴达木盆地钻孔和剖面的含盐地层测年数据进行总结,并与青藏高原第四纪冰川活动和构造运动进行对比,认为柴达木盆地成盐期与青藏高原第四纪冰期及构造运动阶段具有一定的对应关系。柴达木盆地西部盐湖和干盐湖中通常发育有倒数第二次冰期及末次冰期的石盐层,某些盐湖中还有希夏邦玛冰期、望昆冰期、中梁赣冰期的石盐层;迄今为止在柴达木盆地东部的察尔汗盐湖区中仅发现末次冰期以来的石盐层。冰期环境下的干冷气候及冰川扩张,造成盐湖补给水源的减少,有利于盐类物质的沉积。
[Abstract]:The Qaidam Basin is an ideal area for studying the climate and environment change, tectonic movement and basin evolution, and the regularity of salinity and mineralization due to its huge thickness of late Cenozoic sediments and abundant mineral resources. The chronological data of salt-bearing strata in borehole and section of Qaidam Basin are summarized and compared with Quaternary glaciation and tectonic movement in Qinghai-Tibet Plateau. It is considered that the salt-forming period of the Qaidam basin is related to the Quaternary glacial period and tectonic movement stage of the Qinghai-Tibet Plateau. In the western salt lakes and dry salt lakes of the Qaidam Basin, there are usually the penultimate and last glacial rock salt beds, and in some salt lakes, there are the Shixia Bangma Ice Age, the Kunming Ice Age and the Zhongliang Jiangxi Ice Age in the West Salt Lake and dry Salt Lake. So far, only the last glacial layer has been found in the Chaerhan Salt Lake area in the eastern Qaidam Basin. The dry-cold climate and glacier expansion in glacial environment lead to the decrease of recharge water in salt lakes, which is beneficial to the deposition of salt substances.
【作者单位】：中国地质科学院矿产资源研究所国土资源部盐湖资源与环境重点实验室;
【基金】：中国地质调查局地质调查项目(1212331413023) 国家自然科学基金项目(U1407027)
【分类号】：P548;P619.211;P534.63

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