论文部分内容阅读
工区内中生界地层分布较广,约占1/4,厚度大,共10928.5米。它们虽然都是陆相沉积,但岩性十分复杂。除正常沉积岩外,还有很厚的火山碎屑岩、火山岩及次火山岩,局部地区还有钱变质岩。由于岩性复杂,在火山碎屑岩中化石又很少,所以目前地层划分和对比,存在的问题很多。 今年我组的工作任务是建立一个中生界地层综合柱状剖面图及文字报告。
The Mesozoic strata within the work area are widely distributed, accounting for about 1/4 of the total thickness, a total of 10928.5 meters. Although they are all continental deposition, lithology is very complicated. In addition to normal sedimentary rocks, there are thick pyroclastic rocks, volcanic rocks and sub-volcanic rocks, some areas also have money metamorphic rocks. Due to the complexity of lithology, few fossils are found in pyroclastic rocks. Therefore, there are many problems in stratigraphic division and comparison. This year, our group’s task is to create a Mesozoic stratigraphic integrated columnar profile and text report.