Conodont zones and related ash beds through the Permian-Triassic Boundary in South China
Conodont zones and related ash beds through the Permian-Triassic Boundary in South China
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华南二叠系-三叠系界线的牙形刺带及相关灰层
DOI：
10.29041/strat.11.3.04
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发表时间：
2014
期刊：
影响因子：
1.5
通讯作者：
Qiuling Gao
中科院分区：
文献类型：
--
作者：
Ning Zhang;Wenchen Xia;Qinglai Feng;Qiuling Gao
来自中国南部各种古地理环境的六个部分通过二叠纪三叠纪边界提供了高分辨率的牙能区域和相关的灰床。在盆地填充序列中记录了八个牙能区域和八个相关的灰床：按顺序记录：Clarkina Yini带有顶灰床1的Clarkina Yini区，Clarkina Meishanensis Zone and Clarkina Meishanensis Zone和Ash Bed 2，其中的Clarkina Taylorae Taylorae taylorae taylorae taylorae taylorae taylorae taylorae bed bess 3在其基础上，H。Changxingsingensis c。微悬齿区带有灰床4的底座和灰床5，带有灰床6，Isarcisella staeschei Zone和Ash Bed 7，Isarcisella Isarcica Zone和Ash Ash B床8的印度山床和灰床7，其中Neogondolella Krystyni Zone。在坡度设置中，缺少Ash Bed 3和C. taylorae区。尽管在平台内部的地层中，也缺少C. meishanensis区和相关的灰床1和2。该模式表明一种不整合性表示越来越浅的沉积物中丢失的部分。在中国梅山（Meishan）的三叠纪基础的全球层型部分和点被认为是在斜坡环境中形成的，在床基础上有不整合25。伊朗对这些牙能区域的识别表示其适用性在中国南部。
Six sections from diverse paleogeographic settings in South China provide a high-resolution succession of conodont zones and associated ash beds through the Permian-Triassic boundary. Acomplete succession of eight conodont zones and eight associated ash beds is recorded in the basin-filling sequences: in ascending order, the Clarkina yini Zone with top ash bed 1, the Clarkina meishanensis Zone and ash bed 2 within it, the Clarkina taylorae Zone with ash bed 3 at its base, the H. changxingensis-C. microcuspidata Zone with ash bed 4 at its base and ash bed 5 within it, the Hindeodus parvus Zone with top ash bed 6, the Isarcisella staeschei Zone and ash bed 7 within it, the Isarcisella isarcica Zone and ash bed 8 within it, and the Neogondolella krystyni Zone. In slope settings, ash bed 3 and the C. taylorae Zone are missing; whereas in the strata of the platform interior, the C. meishanensis Zone and associated ash beds 1 and 2 are also missing. This pattern indicates an unconformity that represents increasing missing section in increasingly shallower deposits. The Global Stratotype Section and Point for the base of the Triassic, at Meishan, China, is recognized as having been formed in a slope setting, with an unconformity at the base of Bed 25. The identification of these conodont zones in Iran indicates their applicability outside of South China.