青海省治多西北上三叠统巴塘群划分对比与环境分析

青海南部晚三叠世巴塘群沿金沙江缝合带南侧呈带状分布,地质构造复杂,研究程度较低,地层序列的划分存在争议。在1∶250000区域地质调查基础上,通过实测剖面的详细研究和区域对比,将治多西北巴塘群自下而上划分为下组、中组和上组。对研究区巴塘群的岩石组合、生物群面貌、地质时代进行了分析,并利用本次工作中新发现的具重力流沉积泥晶灰岩、具枕状构造玄武岩、具鲍马序列浊流沉积,结合火山岩岩石化学所反映的构造属性,初步探讨了研究区沉积环境和构造背景的演化,为青海南部巴塘群地层的研究提供了基础资料。

Division Contrast and Environment Analysis of the Triassic Batang Group in Northwest Zhidoi Area of Qinghai Province

The Late Triassic Batang group in south Qinghai are located in the south of Jinshajiang suture, the research degree is relatively lower with the complicated geological structures, and still there are disputes in the division of the strata sequences. Based on 1∶〖KG-*2〗250000 regional geology investigation, the Batang group in this article was subdivided into lower Formation, middle Formation and upper Formation in ascending order by the actual section survey and the region contrast. This article analyzed the lithologic combination, the biota appearance, the geological age of the Batang group. At the same time, using the gravity current micrite, the pillow shape basalt, the Bouma sequence turbidite and the structure setting of volcanic rock, discuss preliminary the developing process of the sedimentary environments and tectonic settings in research area, our works have provided the basic data for the research of Batang group.