摘要
白音查干凹陷位于二连盆地西部边缘,是川井坳陷内的一个白垩系陆相断陷盆地,区内发育辫状河、辫状河三角洲、冲积扇、滨浅湖、深湖—半深湖相沉积。其中大磨拐河组主要发育河流沉积体系,找矿目的层主要在辫状河相砂体中。通过在白音查干凹陷北东缘部署重力、可控源音频大地电磁测深和土壤氡气综合剖面工作,本文认为重力剖面较好地反映了研究区基底分布形态和构造发育情况,可控源音频大地电磁测深剖面对构造发育、盆地盖层厚度变化特征能够提供准确的信息,土壤氡气浓度测量可以对构造带分布和物源方向分析提供可靠的依据。结合钻探工程验证结果表明,综合利用不同的物探方法组合可以有效地提高地质找矿效果,并对研究区成矿特征和规律具有一定的指导意义。
Baiyinchagan Depression,located in the western margin of Erlian Basin,is a Cretaceous continental faulted basin in Chuanjing Depression,in which braided river,braided river delta,alluvial fan,shoreline shallow lake,deep lake-semi-deep lacustrine sedimentary facies are developed.The Damoguaihe Formation mainly develops fluvial sedimentary system,and the prospecting target layer is mainly in braided fluvial facies sand body.By deploying a comprehensive profile of gravity,controlled source audio magnetotellurian sounding and soil radon gas in the northeast margin of Baiyin Chagan depression,this paper believes that the gravity profile can better reflect the basement distribution and structural development of the study area,and the controlled source audio magnetotellurian sounding profile can provide accurate information on the structural development and the change characteristics of the cover thickness of the basin.The measurement of soil radon concentration can provide a reliable basis for the analysis of structural zone distribution and source direction.Combined with the verification results of drilling engineering,it is shown that the comprehensive use of different geophysical exploration methods can effectively improve the geological prospecting effect,and has certain guiding significance for the study of metallogenic characteristics and rules in the area.
作者
孙大鹏
李成元
王文杰
徐浩清
樊爽
梁建刚
SUN Dapeng;LI Chengyuan;WANG Wenjie;XU Haoqing;FAN Shuang;LIANG Jiangang(Hohhot General Survey of Natural Resource Center,China Geological Survey,Hohhot 010010,Inner Mongolia,China)
出处
《矿产勘查》
2023年第11期2143-2151,共9页
Mineral Exploration
基金
中国地质调查局地质调查项目“内蒙古二连盆地川井—达日罕乌拉地区砂岩型铀矿勘查”(DD20211549)资助。
