| 贵州威宁金钟二叠系-三叠系界线剖面生物地层及其对比 |
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| 引用本文： | 仇鑫程,童金南,田力,楚道亮,宋婷,李东东.贵州威宁金钟二叠系-三叠系界线剖面生物地层及其对比[J].地球科学,2016,41(10):1709-1722. |
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| 作者姓名： | 仇鑫程 童金南 田力 楚道亮 宋婷 李东东 |
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| 作者单位： | 1.中国地质大学生物地质与环境地质国家重点实验室，湖北武汉 430074 |
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| 基金项目： | 国家自然科学基金项目41530104国家自然科学基金项目41272372 |
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| 摘 要： | 二叠纪—三叠纪之交发生了显生宙最大的生物灭绝事件，同时发生了复杂的环境变化.由于陆相二叠系-三叠系界线附近生物化石记录没有海相记录完整，同时也缺乏其他可靠的年代地层标志，所以如何标定陆相剖面的二叠纪—三叠纪界线一直是研究热点和难点.贵州威宁金钟地区二叠纪—三叠纪之交位于康滇古陆的东侧，毗邻海陆过渡相区，可以与同期的浅海碎屑岩相、海陆过渡相、陆相剖面进行由海到陆“追索式”的生物地层对比，是我国研究海、陆相二叠系-三叠系界线及对比的关键研究区之一.研究区的金钟二叠系-三叠系界线剖面中化石丰富，共发现双壳类化石4属6种，叶肢介2属4种，植物化石9属及腕足类化石1属，为海、陆相地层对比提供了桥梁.依据叶肢介Euestheria gutta-Palaeolimnadia xuanweiensis组合、植物Annalepis-Peltaspermum组合以及双壳类Pteria ussurica variabilis-Neoschizodus orbicularis组合的生物化石时代归属讨论，识别出金钟剖面的二叠系-三叠系界线应该在卡以头组下部.通过与邻区不同相剖面的对比，提出双壳类Pteria ussurica variabilis-Neoschizodus orbicularis组合以及陆相的叶肢介Euestheria gutta-Palaeolimnadia xuanweiensis组合可以作为三叠纪最早期的识别和对比标志.
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| 关 键 词： | 二叠系-三叠系界线 生物地层 海、陆相地层 金钟剖面 古生物学 地层学 |
| 收稿时间： | 2016-03-12 |
The Biostratigraphic Correlation of the Permian-Triassic Boundary in Jinzhong Section,Weining, Guizhou,South China |
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| Abstract: | The Permian-Triassic extinction event, which was associated with major global environmental changes, was the most significant one in the Phanerozoic. However, fossil records around the Permian-Triassic boundary in the terrestrial section are not complete compared with those in the marine section, and the precise time framework is not available. Thus the study of the Permian-Triassic boundary in terrestrial section has been hot and complicated. The Jinzhong section located in the eastern margin of the Kangdian Continent, near the transitional facies zone of the Permian and Triassic, can be compared with the marine section and terrestrial section at the same time in this period. The Jinzhong section has abundant fossils, including bivalve (4 genus 6 species), conchostracans (2 genus 4 species), plant fossils (9 genus) and brachiopods (1 genus).According to the age of the conchostracans fossil assemblages Euestheria gutta-Palaeolimnadia xuanweiensis, the plant fossil assemblages Annalepis sp.-Peltaspermum sp. and the bivalve fossil assemblages Pteria ussurica variabilis-Neoschizodus orbicularis, the Permian-Triassic boundary in the Jinzhong section is at the bottom of Kayitou Formation. In addition, the conchostracans fossil assemblages Euestheria gutta-Palaeolimnadia xuanweiensis and the bivalve fossil assemblages Pteria ussurica variabilis-Neoschizodus orbicularis can be used as a reliable marker of early Triassic in stratigraphic division and correlation in the marine-continental transitional facies in South China. |
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