The Global Boundary Stratotype Section and Point (GSSP) of the Guzhangian Stage (Cambrian) in the Wuling Mountains, Northwestern Hunan, China

The Global Boundary Stratotype Section and Point (GSSP) of the Guzhangian Stage (Cambrian) in the Wuling Mountains, Northwestern Hunan, China
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中国湘西北武陵山古丈阶(寒武系)全球边界层型剖面和点(GSSP)

DOI:
10.18814/epiiugs/2009/v32i1/006
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发表时间:
2009-03
期刊:
影响因子:
3.1
通讯作者:
Yong’an Chen
Yong’an Chen
中科院分区:
地球科学4区
文献类型:
--
作者:
Xuejian Zhu;Gabriella Bagnoli;Yuping Qi;Huanling Lin;Richard A. Robison;Shanchi Peng;Xianfeng Yang;Loren E. Babcock;Jingxun Zuo;Yong’an Chen

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古掌阶底部全球界线层型剖面及点(GSSP)位于湘西北罗义溪(王村东南4km)西北沿着酉水河(凤滩水库)的娄义溪剖面花桥组底以上121.3m的灰岩(钙粉砂岩)层底部。GSSP暴露在位于北纬28°43.20'东经109°57.88'的道路切割中。GSSP水平包含世界性不可知类三叶虫Lejopyge laevigata(L. laevigata Zone)。第二个全球性的标志物附近的基础阶段包括外观或L。calva或L.阶段底部下方的armata、与莱芜颚藻莱芜带底部相关的牙形刺的出现以及小型海平面变化事件的海侵阶段。古章阶底部附近的动物区系更替被认为是在澳大利亚的布梅兰阶底部、西伯利亚的Aldanaspis带(聚合三叶虫)底部和阿瓦隆尼亚西部的Paradoxides forchhammeri带底部附近。对应于L首次出现的视界。laevigata的δ 13 C值在0.58 ‰的长期负偏峰值附近。
The Global boundary Stratotype Section and Point (GSSP) for the base of the Guzhangian Stage (Cambrian Series 3) is defined at the base of a limestone (calcisiltite) layer 121.3 m above the base of the Huaqiao Formation in the Louyixi section along the Youshui River (Fengtan Reservoir), about 4 km northwest of Luoyixi (4 km southeast of Wangcun), in northwestern Hunan, China. The GSSP is exposed in a road cut at a position of 28°43.20' N and 109°57.88' E. The GSSP level contains the lowest occurrence of the cosmopolitan agnostoid trilobite Lejopyge laevigata (base of the L. laevigata Zone). Secondary global markers near the base of the stage include the appearance of either L. calva or L. armata just below the base of the stage, the appearance of conodonts associated with the base of the Laiwugnathus laiwuensis Zone, and the transgressive phase of a small eustatic event. Faunal turnovers close to the base of the Guzhangian Stage are recognized as near the base of the Boomerangian Stage in Australia, the base of the Aldanaspis Zone (polymerid trilobites) in Siberia, and the base of the Paradoxides forchhammeri Zone in western Avalonia. The horizon corresponding to the first appearance of L. laevigata is near the peak of a rather long negative δ 13 C excursion of up to 0.58 ‰.
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