A new Changhsingian brachiopod fauna from the Xiala Formation at Tsochen in the central Lhasa Block and its paleogeographical implications
A new Changhsingian brachiopod fauna from the Xiala Formation at Tsochen in the central Lhasa Block and its paleogeographical implications
复制标题
拉萨地块中部措钦夏拉组一新长兴纪腕足动物群及其古地理意义
DOI：
10.1017/jpa.2019.28
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发表时间：
2019-09
影响因子：
1.4
通讯作者：
Shen Shu-zhong
中科院分区：
文献类型：
--
作者：
Xu Hai-peng;Zhang Yi-chun;Qiao Feng;Shen Shu-zhong
摘要拉萨地块二叠纪动物群亲缘关系对恢复其古地理演化具有重要作用。拉萨地块发现了西苏拉期和瓜达卢期动物群，但洛平纪(晚二叠世)腕足类的报道很少。本文记述了拉萨地块中部阿多嘎布剖面下拉组最上部的腕足类动物群，隶属17属17种，并发现1种未知的正肢动物总科。该动物群的时代可以确定为长兴期(洛平纪晚期)，相关的有孔虫Colaniella parva(Colani，1924)和Reichelina Pulchra Miklukho-Maklay，1954年。特征腕足类有：程氏脊椎动物、翁氏海藻(Haydenella wenganensis(Huang，1932))和阿拉克瑟里斯。伸缩虫，沈和，朱，1992。他们还普遍认为是昌新时代。在古生物地理上，该动物群均由以Spinomarginifera Huang(1932)和Haydenella Reed(1944)为代表的典型特提斯成分和一些世界性成分组成，但没有典型的冈德瓦南亲缘冷水类群。这与特提斯喜马拉雅地区同期的腕足动物群形成了鲜明的对比，后者具有典型的冈氏亲缘冷水类群，如Costiferina inca(Waagen，1884)，Retimatinifera xizangensis Shenet al.，2000，Neospirifer(Quadrospina)tibetens Ding，1962。由此可见，拉萨地块在长兴期已进入相对温暖的水系。通过对拉萨地块腕足类在整个二叠纪的古生物地理变化的分析，进一步表明拉萨地块很可能在西苏拉期末期至瓜达卢期中期之间脱离了北缘的冈德瓦南边缘，即新特提斯洋在瓜达卢期中期之前就已经打开。
Abstract Permian faunal affinity in the Lhasa Block plays a critical role in reconstructing its paleogeographic evolution. Cisuralian and Guadalupian faunas have been described from the Lhasa Block, but very few Lopingian (late Permian) brachiopods have been reported so far. In this paper, a new diverse brachiopod fauna consisting of 17 species of 17 genera and an unidentifiable Orthotetoidea is described from the uppermost part of the Xiala Formation at the Aduogabu section in the central part of the Lhasa Block. The age of this fauna can be assigned to the Changhsingian (late Lopingian) as indicated by the associated foraminifers Colaniella parva (Colani, 1924) and Reichelina pulchra Miklukho-Maklay, 1954. Characteristic brachiopods include Spinomarginifera chengyaoyenensis Huang, 1932, Haydenella wenganensis (Huang, 1932), and Araxathyris cf. dilatatus Shen, He, and Zhu, 1992. They also generally suggest a Changhsingian age. Paleobiogeographically, this fauna is uniformly composed of typical Tethyan elements represented by Spinomarginifera Huang, 1932 and Haydenella Reed, 1944, and some cosmopolitan elements, but no typical cold-water taxa of Gondwanan affinity. This is in contrast to the contemporaneous brachiopod faunas from the Tethys Himalayan region that are characterized by typical cold-water taxa of Gondwanan affinity, e.g., Costiferina indica (Waagen, 1884), Retimarginifera xizangensis Shen et al., 2000, Neospirifer (Quadrospina) tibetensis Ding, 1962. Thus, it is strongly indicative that the Lhasa Block had drifted into a relatively warm-water regime during the Changhsingian. An analysis of the paleobiogeographic change of brachiopods in the Lhasa Block throughout the entire Permian further suggests that the Lhasa Block probably had rifted away from the northern peri-Gondwanan margin between the latest Cisuralian and middle Guadalupian, that is, the Neotethys Ocean had opened before middle Guadalupian.
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影响因子：
1.3
作者：
Trilochan Singh;N. Archbold
通讯作者：
Trilochan Singh;N. Archbold
DOI：
--
发表时间：
2014
期刊：
Journal of stratigraphy
影响因子：
--
作者：
Zhang Yu-ji
通讯作者：
Zhang Yu-ji
DOI：
10.1016/j.palaeo.2014.06.016
发表时间：
2014-10
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
--
作者：
Guichun Wu;Zhansheng Ji;J. Trotter;Jian-xin Yao;Liqin Zhou
通讯作者：
Guichun Wu;Zhansheng Ji;J. Trotter;Jian-xin Yao;Liqin Zhou
DOI：
--
发表时间：
--
期刊：
--
影响因子：
--
作者：
Melle M Colani
通讯作者：
Melle M Colani
DOI：
--
发表时间：
2008-03
期刊：
Science reports of Niigata University
影响因子：
--
作者：
J. Tazawa
通讯作者：
J. Tazawa