北祁连阿柔地区石炭纪层序地层研究及其找矿意义

Study on the Carboniferous Sequence Stratigraphy and Its Prospecting Significance in Arou Area in North Qilian Mountain

摘要:

石炭纪地层是该地区分布最广泛的地层之一，因其为一套含煤地层，其沉积特征的研究对煤矿找矿工作非常重要。根据其岩石组合特征划分为2个组即臭牛沟组和羊虎沟组，多受NW—SE向断裂影响，而沿构造方向展布，其顶底一般发育齐全，通过对其层序地层的研究，认为在石炭纪地层发育时期，该区经历了2次较完整的海水入侵及退出的过程，其中的煤矿与第2个海侵体系域发育程度密切相关。

Abstract:

Carboniferous strata is one of the most widely distributed strata in this area. It is a set of coal bearing formation, so the study on sedimentary characteristics of coal prospecting work is very important. According to rock association characteristics, the strata in this area can be divided into Chouniugou formation and Yanghugou formation. They are controllded by faults with the trend of NW—SE, and distributed along the direction of the structures. Its top and bottom parts are generally developed completly. Through study on the sequence stratigraphy of Carboniferous strata in this period, it is regarded that this area has experienced two times complete sea water intrusion and exiting periods. Coal deposits have close relation with the degree of the second development of the transgressive system tract.