Permian (Artinskian to Wuchapingian) conodont biostratigraphy in the Tieqiao section, Laibin area, South China
Permian (Artinskian to Wuchapingian) conodont biostratigraphy in the Tieqiao section, Laibin area, South China
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来宾地区铁桥剖面二叠纪（阿廷斯克阶至五查坪阶）牙形刺生物地层
DOI：
10.1016/j.palaeo.2016.10.013
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Xulong Lai
中科院分区：
文献类型：
--
作者：
Yadong Sun;Xiting Liu;Jiaxin Yan;Bo Li;Bo Chen;David Bond;Michael M Joachimski;Paul Wignall;Xia Wang;Xulong Lai
中国南部江南盆地铁桥剖面的二叠系地层中含有几个独特的牙形刺组合。早二叠世(西苏拉纪)组合以Sweetogna、Partiosweetognathus和Hindeodus属为主，新链条藻属和Gullodus属较少。直到昆古尔期结束前，贡多丽藻都不存在--这与世界上许多地区的贡多丽藻和新链齿形刺是主要的昆古尔期牙形刺形成了鲜明的对比。在铁桥发现了牙形刺的转换，并与昆古尔晚期至罗甸早期海平面上升相吻合：以前占主导地位的甜齿类被中柱石类取代。中、晚二叠世(瓜达卢皮亚期和洛平期)以刚石类为主(吉诺贡多拉和克拉里娜)，普遍存在兴诺多人和大量的斯威特纳特斯人，铁桥识别出20个主牙形刺带和7个从属牙形刺带，横跨下阿廷斯基期至乌恰平期中期。主要(首次出现的基准面)带由高到低依次为：白眉山带、白带带、西南带。Toriyamai和Sw.不对称。SP.阿尔丁斯基期的地带；西南的新链霉菌群。贵州，西南。南卡罗来纳州伊拉尼克斯南卡罗来纳州阿德克图斯Subsymmeticus和Sw.汉中地区为昆古尔期；吉诺贡多拉(J.)南京区为罗甸地区；作为Wordian的勘误区；The J.P.serrata，J.shannoni，J.altudaens，J.prexuanhanensis，J.xuanhanensis，J.grantiand和Clarina(C.)hongwater为首都和C.后苦味地带和DC。吴家坪组底部和中部的外高加索地带。次生(间隔)带为拟小球藻(Ps.)共态，Ps.Monocornus、Hindeodus(H.)ulloides、Pseudohindeodus ramovsi、Gullodus(G.)sicilianus、G.duaniandH.此外，还发现了3个新种：铁桥古露螺属。Sp.、椭圆假单胞菌Pseudohindeodus elltican.SP.和不对称甜菊属。SP.都被描述了。不太常见物种的年龄分配(如：G.duani、H.Catanoi和Partiosweetogna monocornus等)根据丰富的牙形刺集合进行了重新评估。
Permian strata from the Tieqiao section (Jiangnan Basin, South China) contain several distinctive conodont assemblages. Early Permian (Cisuralian) assemblages are dominated by the generaSweetognathus,PseudosweetognathusandHindeoduswith rareNeostreptognathodusandGullodus. Gondolellids are absent until the end of the Kungurian stage—in contrast to many parts of the world where gondolellids andNeostreptognathodusare the dominant Kungurian conodonts. A conodont changeover is seen at Tieqiao and coincided with a rise of sea level in the late Kungurian to the early Roadian: the previously dominant sweetognathids were replaced by mesogondolellids. The Middle and Late Permian (Guadalupian and Lopingian Series) witnessed dominance of gondolellids (JinogondolellaandClarkina), the common presence ofHindeodusand decimation ofSweetognathus.Twenty main and seven subordinate conodont zones are recognised at Tieqiao, spanning the lower Artinskian to the middle Wuchiapingian Stage. The main (first appearance datum) zones are, in ascending order by stage: theSweetognathus(Sw.)whitei,Sw. toriyamai, andSw. asymmetrican. sp. Zones for the Artinskian; theNeostreptognathodus prayi,Sw. guizhouensis,Sw. iranicus,Sw. adjunctus,Sw. subsymmeticusandSw. hanzhongensisZones for the Kungurian; theJinogondolella(J.)nankingensisZone for the Roadian; theJ. aserrataZone for the Wordian; theJ. postserrata,J. shannoni,J. altudaensis,J. prexuanhanensis,J. xuanhanensis,J. grantiandClarkina(C.)hongshuiensisZones for the Capitanian and theC. postbitteriZone andC. transcaucasicaZone for the base and middle of the Wuchiapingian. The subordinate (interval) zones are thePseudosweetognathus(Ps.)costatus,Ps. monocornus,Hindeodus(H.)gulloides,Pseudohindeodus ramovsi,Gullodus(G.)sicilianus,G. duaniandH. excavatesZones.In addition, three new species,Gullodus tieqiaoensisn. sp.,Pseudohindeodus elliptican. sp. andSweetognathus asymmetrican. sp. are described. Age assignments for less common species (e.g.,G. duani,H. catalanoiandPseudosweetognathus monocornusetc.) are reassessed based on a rich conodont collection.