乌拉特后旗测老庙坳陷下白垩统巴音戈壁组实测剖面简介——测老庙坳陷典型露头介绍之三

发布时间：2018-09-01 17:11

【摘要】：本文描述了内蒙古自治区西部乌拉特后旗测老庙坳陷下白垩统巴音戈壁组的三条实测剖面,分别位于测老庙坳陷南缘西侧、南缘东侧和西北缘。其中,测老庙南缘西侧剖面出露了巴音戈壁组的主要部分,发育了一套完整的洪积扇相—河流相—湖泊相—河流相—洪积扇相的陆相沉积旋回。该剖面底部不整合覆盖在前寒武系变质基底之上,未见顶。南缘东侧发育了洪积扇相—辫状河相—洪积扇相沉积旋回,属于巴音戈壁组上段,其下部可能与南缘西侧剖面存在地层重复,而上部未见顶。测老庙坳陷西北缘剖面则出露了一套湖相页岩为主夹三角洲入湖砂体的地层,代表了巴音戈壁组的上段中部,其下部未见底,上部未见顶。由于该区植被稀少,剖面露头良好,这三条剖面可作为巴音戈壁盆地群陆相沉积体系研究的重要材料和区域地质野外测量实习的良好场所。
[Abstract]:In this paper, three measured profiles of the lower Cretaceous Baryingobi formation in Houqi, Houqi, western Inner Mongolia Autonomous region are described. They are located on the west side of the southern margin, the east side of the southern margin and the northwest margin of the southern margin. The main parts of the Bayingobi formation are exposed in the western section of the southern margin of Zhaolao Miao, and a complete set of continental sedimentary cycles of alluvial fan facies, fluvial facies, lacustrine facies, fluvial facies and alluvial fan facies are developed. The bottom of the section is unconformable over the Precambrian metamorphic basement without a top. There is a sedimentary cycle of alluvial fan facies, braided river facies and alluvial fan facies on the east side of the southern margin, which belongs to the upper part of the Bayingobi formation. The lower part of the sedimentary cycle may be duplicated with the western section of the southern margin, but the top of the upper part is not seen. A set of lacustrine shale-dominated deltaic strata entering the lake sand body is exposed in the profile of the northwestern margin of the Zhaolaimiao depression, which represents the upper part of the Bayingobi formation, with no bottom at the lower part and no top at the upper part. Because the vegetation is scarce and the profile outcrop is good, these three sections can be used as important materials for the study of continental sedimentary system of Bayingobi basin group and a good place for regional geological field survey practice.
【作者单位】：中国科学院南京地质古生物研究所现代古生物学和地层学国家重点实验室;中国石油大学地学院;中国地质科学院;
【基金】：中陕核工业集团委托的研究项目“测老庙盆地区域地质研究与铀矿有利区带预测”的成果之一~~
【分类号】：P534.53

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