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一、绪言北祁连山东段早石炭世地层普遍发育,早石炭世早期地层是该区晚古生代主要含矿地层(如小红山——甘塘大型石膏矿床,即成生于该地层之中、下部)。该区的下石炭统地层,前人称之为“臭牛沟组”,系袁复礼(1925)创名,标准地点在甘肃省天祝县祁连山区臭牛沟。解放后,相继有不少地质生产单位和科研部门在古浪一黑山以及靖远地区,对石炭纪地层进行了研究,又通过区域地质调查工作,取得了大量的地质资料。主要有: 王建章(1959)按岩性把臭牛沟统分为上、下两部分:下部称新城子砂岩(在剖面描述
I. INTRODUCTION The Early Carboniferous strata in the eastern part of the northern Qilian Mountains generally developed. The Early Carboniferous strata were the main late-Paleozoic ore-bearing strata in the area (such as the Xiaoxingshan-Gantang gypsum deposit, which was born in this strata, Lower part). The Lower Carboniferous strata of the area, formerly known as “foul cattle ditch group”, was founded by Yuan Fu-li (1925). The standard site was located in the faint cow ditch of Qilian Mountain in Tianzhu County, Gansu Province. After the liberation, many geological production units and scientific research departments successively conducted research on the Carboniferous strata in the Gulang-Montenegro and Jingyuan areas and obtained a large amount of geological data through regional geological survey. Mainly include: Wangjian Zhang (1959) according to the lithology of cattle cattle groove is divided into upper and lower parts: the lower part of the Xinchengzi sandstone (described in the section