The Changhsingian foraminiferal fauna of a Neotethyan seamount: the Gyanyima Limestone along the Yarlung‐Zangbo Suture in southern Tibet, China
The Changhsingian foraminiferal fauna of a Neotethyan seamount: the Gyanyima Limestone along the Yarlung‐Zangbo Suture in southern Tibet, China
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DOI：
10.1002/gj.1238
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发表时间：
2010-03
影响因子：
1.8
通讯作者：
Yue Wang;K. Ueno;Yi‐chun Zhang;Changqun Cao
中科院分区：
文献类型：
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作者：
Yue Wang;K. Ueno;Yi‐chun Zhang;Changqun Cao
江孜玛灰岩是一种孤立的碳酸盐岩堆积，可能起源于新特提斯海山，分布于西藏南部的沿着雅鲁藏布江缝合线。石灰岩产生了高度多样化的有孔虫动物群，包括9个fusuline和37个非fusuline有孔虫分类群。该有孔虫动物群主要由美丽的Reichelina pulchra，Colaniella parva和特征性的boultoniid属Dilatofusulina。我们提出了一个新的有孔虫带，Reichelina pulchra‐Colaniella parva‐Dilatofusulina orthogonios带，代表了二叠纪末大灭绝之前有孔虫的最后繁荣阶段。根据动物群主要成分的先进特征，该带可与东特提斯的Palaeofusulinasinensis带进行广泛的对比。动物群的组成表明，在长兴晚期，江义马灰岩在新特提斯中处于低纬度的古地理位置。该动物群在很大程度上受到温暖的赤道热带古特提斯的影响。版权所有© 2010约翰威利父子有限公司.
The Gyanyima Limestone is one of the isolated carbonate build‐ups that have a probable Neotethyan seamount origin, distributed along the Yarlung‐Zangbo Suture in southern Tibet. The limestone yields a highly diversified foraminiferal fauna consisting of nine fusuline and 37 taxa of non‐fusuline foraminifers. This foraminiferal fauna is dominated by Reichelina pulchra, Colaniella parva and the characteristic boultoniid genus Dilatofusulina. We propose a new foraminiferal zone, the Reichelina pulchra‐Colaniella parva‐Dilatofusulina orthogonios Zone that represents the last prosperous stage of foraminifers just before the end‐Permian mass extinction. This zone can be correlated broadly with the Palaeofusulina sinensis Zone in the Eastern Tethys based on advanced features observed in the major elements of the fauna. The composition of the fauna suggests that during the late Changhsingian, the Gyanyima Limestone occupied a palaeogeographic position at lower latitudes in the Neotethys. The fauna was largely influenced by the warm‐water equatoro‐tropical Palaeotethys. Copyright © 2010 John Wiley & Sons, Ltd.