ABSTRACT

This paper describes a study of the lower Jurassic conglomerates in the region around Lake Baikal (Irkutsk and Chita Oblasts, Buryat Republic). The approach used in the study was the analysis of samples from well cores, outcrops, and mine workings. Lithological and geochemical analyses of the conglomerate’s matrices suggest that the conglomerates were deposited in a single early Jurassic river paleo-valley, the geological structure of which was later complicated by tectonic processes. The most significant results of this were the formation of the Angara-Selenga imbricate-fan thrust and the Baikal rift basin. The position of the Praselenga River valley was reconstructed for the first time. It is noted that gold-bearing Lower Jurassic conglomerates are represented by mineralogical association resistant to weathering processes formed in the mountain valleys.

摘要

本文介绍了对贝加尔湖周围地区（伊尔库茨克州和奇塔州，布里亚特共和国）的侏罗纪下部砾岩的研究。该研究中使用的方法是对来自岩心，露头和矿山作业的样品进行分析。对砾岩基质的岩性和地球化学分析表明，砾岩沉积于侏罗纪早期的一条古河谷中，其地质结构后来由于构造过程而变得复杂。最显着的结果是形成了安加拉—塞伦加（Angara-Selenga）扇状扇逆冲和贝加尔湖裂谷盆地。普拉塞伦加河谷的位置首次被重建。