Conodont biostratigraphy of a new Permo-Triassic boundary section at Wenbudangsang, north Tibet
Conodont biostratigraphy of a new Permo-Triassic boundary section at Wenbudangsang, north Tibet
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DOI：
10.1016/j.palaeo.2014.06.016
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发表时间：
2014-10
期刊：
影响因子：
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通讯作者：
Guichun Wu;Zhansheng Ji;J. Trotter;Jian-xin Yao;Liqin Zhou
中科院分区：
文献类型：
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作者：
Guichun Wu;Zhansheng Ji;J. Trotter;Jian-xin Yao;Liqin Zhou
文布当桑剖面是一个新发现的连续海相碳酸盐岩序列，横跨二叠纪-三叠纪界线（PTB），从晚二叠世延伸到早三叠世（Induan）。该剖面位于西藏北方革吉县温布当桑地区，构造上位于冈底斯北方地层分区内。牙形刺在整个剖面中非常丰富，但在PTB粘土层以下的二叠纪地层中比较少见，种类较少，主要以Hindeodus-IsarcicellaPa元素、NeogondolellaPa元素和枝状元素为代表，在剖面顶部有少量NeospathodusPa元素。根据Hindeodus-Isarcicella和Neogondolellaspecies，确定了两个牙形石带性序列。Hindeodus-Isarcicella层序包括二叠系最上部的Hindeodus julfensis带、Hindeodus preeparvus带和三叠纪最下部的Hindeodus parvus带、Isarcicella staeschei带、Isarcicella isarcica带和Hindeodus postparvus带。Neogondolella层序包括上二叠统Neogondolella changxingensis-Neogondolella deflecta-Neogondolella postwangi带、Neogondolella yini-Neogondolella zhangi带、Neogondolella meishanensis带、穿过PTB的Neogondolella taylorae带和下三叠统Neogondolella kenjyni带和Neogondolella predisctan带。sp.区。剖面顶部由Neospathodus Cristagalli带和Neospathodus Cristagalli带界定。二新种，细齿乌齿象Hindeodus microdentatusn. sp.和N.预先决定的例如，文布当桑新剖面所识别的PTB牙形刺序列与中国南方的GSSP眉山剖面、伊朗的阿巴代剖面和印度的斯皮提剖面进行了对比。重要的是，牙形石动物群从Wenbudangsang现在提供了一个机会，有效地相关PTB hindeodid和gondolellid的地带性方案，鉴于这两个组合的高丰度，这是唯一的这一节。
The Wenbudangsang section is a newly discovered continuous succession of marine carbonates that straddles the Permian–Triassic boundary (PTB), extending from the late Permian to the earliest Triassic (Induan). The section is located in the Wenbudangsang area of Geji County, northern Tibet, and tectonically sits within the northern Gangdise Stratigraphic division. Conodonts are abundant throughout this section, except being comparatively rare and less diverse in the Permian strata below the distinctive PTB Clay Bed.The conodonts are mainly represented byHindeodus–IsarcicellaPa elements,NeogondolellaPa elements, and ramiform elements, with fewNeospathodusPa elements present at the top of the section. Two conodont zonal successions have thus been determined based onHindeodus–IsarcicellaandNeogondolellaspecies. TheHindeodus–Isarcicellasuccession includes the uppermost PermianHindeodus julfensisZone,Hindeodus praeparvusZone, and the lowermost TriassicHindeodus parvusZone,Isarcicella staescheiZone,Isarcicella isarcicaZone, andHindeodus postparvusZone. TheNeogondolellasuccession consists of the upper PermianNeogondolella changxingensis–Neogondolella deflecta–Neogondolella postwangiZone,Neogondolella yini–Neogondolella zhangiZone,Neogondolella meishanensisZone, theNeogondolella tayloraeZone that crosses the PTB, and the lowermost TriassicNeogondolella krystyniZone andNeogondolella prediscretan. sp. Zone. The top of the section is defined by theNeospathodus kummeliZone andNeospathodus cristagalliZone. Two new species,Hindeodus microdentatusn. sp. andN. prediscretan. sp., are established and described in this paper.The PTB conodont successions recognised in the new Wenbudangsang section have been closely correlated herein with other well-known PTB sections: the GSSP Meishan section of South China, sections in Abadeh in Iran, and sections at Spiti in India. Importantly, the conodont faunas from Wenbudangsang now provide an opportunity to effectively correlate the PTB hindeodid and gondolellid zonal schemes given the high abundance of both assemblages, which is unique to this section.