南非陆相二叠系—三叠系界线研究进展  

Advance in Study of Terrestrial Permian-Triassic Boundary in South Africa

作　　者：彭元桥[1] 高勇群[2] 杨逢清[1] 殷鸿福[1] G.R.Shi 

机构地区：[1]中国地质大学地球科学学院,武汉430074 [2]中国地质大学出版社,武汉430074 [3]School of Ecology and Environment,Deakin University,Melbourne Campus

出　　处：《地质科技情报》2006年第1期1-8,共8页Geological Science and Technology Information

基　　金：国家自然科学基金资助项目(4017201240232025);湖北省自然科学基金重点资助项目(2001ABB177)

摘　　要：从岩石地层研究着手,介绍了南非卡鲁盆地内综合地层研究的相关成果。在生物地层方面,脊椎动物和植物化石的研究在该区具有传统优势,孢粉化石的研究则是在最近几年才取得较大进展,在陆相界线地层研究中菌孢化石在二叠系—三叠系界线处约1 m厚的地层内的富集事件属首次报道。在地球化学地层方面,南非有机碳同位素在二叠系—三叠系界线附近的变化趋势与海相二叠系—三叠系界线地层存在相似的对应关系,可以作为海、陆相界线地层对比的辅助标志。在磁性地层方面,南非卡鲁盆地内的磁极性存在从反向到正向然后再反转(R-N-R)的变化,二叠系—三叠系界线则位于第一反向极性带的顶部。同时,结合目前全球陆相二叠系—三叠系界线的研究现状及特点,分析了陆相界线地层研究中存在的基本问题,指出华南地区可能为突破传统观念的研究地区,陆地事件地层研究意义重大。The Karoo Basin of South Africa is one of the most favourite areas in the world for the study of the terrestrial Permian-Triassic boundary（PTB）, for its wide distribution and detailed study of vertebrate fossils. Recently, more and more advances have been achieved in this area and some of them have been published in a series of global top-ranking journals including Science . Here this paper, based on the lithostratigraphic study, emphasizes the introductions to the advances of the terrestrial PTB study in the Karoo Basin of South Africa. According to the biostratigraphic study, vertebrates and plants are the traditional studied fossils of priority, while the study of palynomorphs has no achievements until recently. The fungi enrichment event in the 1 m thick strata across the PTB has been firstly found in the terrestrial PTB study in South Africa. The organic carbon isotopic study in South Africa has revealed almost the same changing trends across the PTB as in the marine PTB sections in the world, which can be used as one of the auxiliary markers for the correlation of the PTB from marine facies to land. The magnetostratigraphic study in South Africa found three polarity zones from reversal to normal and then reversal in the PTB strata, and the terrestrial PTB lies in the top of the first reversal polarity zone. In the meantime, the subsistent basic issues along with the global terrestrial PTB study and its study potentials are discussed as well.

关 键 词：南非卡鲁盆地 陆相二叠系-三叠系界线 生物地层 地球化学地层 磁性地层 事件地层 

分 类 号：P534[天文地球—古生物学与地层学]