大山包二叠系–三叠系火山活动与P-T边界生物大灭绝的耦合性  

Coupling of Permian-Triassic Volcanic Activity in Dashanbao with P-T Boundary Mass Biotic Extinction

作　　者：徐丽琼[1] 马欠 邓春暖[1] 

机构地区：[1]云南师范大学旅游与地理科学学院,云南昆明

出　　处：《自然科学》2018年第1期97-104,共8页Open Journal of Nature Science

基　　金：国家自然科学基金项目资助(21467031)。

摘　　要：峨眉山具有大面积的火山喷发后形成的玄武岩。它覆盖了云贵川三省的许多地区,其中就包括云南省昭通市的大山包。此文通过多种资料对峨眉山玄武岩(Emeishan basalt area, EBA),大山包整合、归纳,知道大山包火山活动发生在二叠系–三叠系(P-T)。同时,在这一时期发生了有史以来一次最大规模的生物灭绝。其成因可能是火山喷发所致。通过使用U-Pb对EBA下伏的岩石进行测定得到其主要喷发时间约为260 Ma。因此,大山包玄武岩形成在P-T边界内。大山包的火山活动和二叠系–三叠系生物大灭绝存在着很大的耦合性。Emei Mountain has a large area of basalt formed after volcanic eruption. It covers many parts of the Yunnan, Guizhou and Sichuan provinces, including the Dashanbao in Zhaotong, Yunnan prov-ince. This paper integrates and summarizes the Emeishan basalt area (EBA) and Dashanbao package through a variety of data and knows that the Dashanbao volcanic activity occurred in the Permian-Triassic (P-T). At the same time, the largest biological extinction ever occurred in this period. It may be caused by volcanic eruption. By using U-Pb to measure the rock under the EBA, the main eruption time is about 260 Ma. Therefore, Dashanbao basalt formed within the P-T boundary. There is a great coupling between Dashanbao volcanic activity and the Permian-Triassic biological extinction.

关 键 词：大山包玄武岩 二叠纪晚期 生物灭绝 

分 类 号：P61[天文地球—矿床学]