准噶尔盆地西北缘包古图组的沉积环境

SEDIMENTARY ENVIRONMENTS OF BAOGUTU FORMAION ON THE NORTHWESTERN MARGIN OF JUNGGAR BASIN

准噶尔盆地西北缘包古图组的沉积环境,前人论述颇多,且普遍认为属浅海环境的沉积产物。本文采用沉积学、地层古生物学、元素地球化学等方法,对该区包古图组的沉积环境进行较系统的研究,认为它主要是浅海—较深海沉积的产物,同时,顶、底部尚发育有陆地河流岩石相,其形成时代为石炭纪维宪期—巴什基尔期。

The sedimentary environment of the Baogutu Formation on the northwestern margin of Junggar basin has been widely discussed. Many authors consider that the Baogutu Formation is shaliowsea sediments. This paper systematically studies the sedimentary environment of the Baogutu Formation in this area using the methods of sedimentology, stratigraphic palaeontoiogy, element geochemistry, and so on. It is considered that the Baogutu Formation is mainly shallow to bathyal deposits, and its top and bottom are continental fluvial lithofacies. The Baogutu Formation was formed in the Viseen and Bashkirian of the Carboniferous.