Characterization of Iron Grains near the P/T Boundary in the Meishan Section of China  

作　　者：CAI Hou＇an LIANG Handong ZHANG Jun LUO Chunping 

机构地区：[1]China University of Mining and Technology, Beijing 100083 [2]State Key Laboratory of Coal Resources and Safety Mining Beijing 100083

出　　处：《Acta Geologica Sinica(English Edition)》2006年第1期46-51,共6页地质学报（英文版）

基　　金：This research was supported by the National Natural Science Foundation of China （Nos. 40232025; 40072055; 40572020） ;the Research Fund for the Doctoral Program of Higher Education （No. 20040290005）.

摘　　要：The Meishan section of China has been confirmed as the ＂Global Stratotype Section and Point＂ of the P/T boundary. In the section, the authors found several types of iron grains, including pyrite, pure iron grains and goethite. From the research of macro minerals, it is easy to find that the grains rich in iron appear from the bottom of the event layer of the section. In other words, it is probably residue of the geochemical catastrophe of that time. Therefore, it is important to trace the source of these iron grains and their relationships, which probably provides evidence for volcanic eruption or impact-volcanoes and has directive significance to the crisis during the P/T transitional period. Through the study of the characterization and relationships of these iron grains, the authors make a preliminary discussion on the P/T mass extinction.The Meishan section of China has been confirmed as the ＂Global Stratotype Section and Point＂ of the P/T boundary. In the section, the authors found several types of iron grains, including pyrite, pure iron grains and goethite. From the research of macro minerals, it is easy to find that the grains rich in iron appear from the bottom of the event layer of the section. In other words, it is probably residue of the geochemical catastrophe of that time. Therefore, it is important to trace the source of these iron grains and their relationships, which probably provides evidence for volcanic eruption or impact-volcanoes and has directive significance to the crisis during the P/T transitional period. Through the study of the characterization and relationships of these iron grains, the authors make a preliminary discussion on the P/T mass extinction.

关 键 词：Meishan section P/T boundary PYRITE GOETHITE iron grain 

分 类 号：P618.2[天文地球—矿床学]