云南盘溪一打得组的牙形类及其时代  被引量:3

CONODONTS FROM THE YIDADE FORMATION AT THE PANXI SECTION ON YUNNAN, SOUTH CHINA

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作  者:张宇波[1] 马学平[1] Zhor Sarah ABOUSSALAM 张美琼[1] ZHANG Yu-bo;MA Xue-ping;Zhor Sarah ABOUSSALAM;ZHANG Mei-qiong(School of Earth and Space Sciences,Peking University,Key Laboratory of Orogenic Belts' and Crustal Evolution,Beijing 100871;Institut fiir Geologie und Palaontologie,Westfalische Wilhelms-Universitat,Corrensstr.24,D-48149 Miinster,Germany)

机构地区:[1]北京大学地球与空间科学学院造山带与地壳演化教育部重点实验室(北京大学),北京100871 [2]Institut fur Geologie und Palaiontologie,Westfailische Wilhelms-Universiat,Corrensstr.24,D-48149 Munster,Germany

出  处:《地层学杂志》2018年第3期301-312,共12页Journal of Stratigraphy

基  金:国家自然科学基金项目(41290260)资助.

摘  要:云南盘溪剖面是华南泥盆系的一个重要参考剖面,以开阔台地相—台地边缘相—局限台地相交互为特点,含丰富的底栖生物,包括珊瑚、腕足类等,而一打得组又不乏竹节石、牙形类等浮游及游泳生物化石,这对于确定其时代及华南中—晚泥盆世地层对比具有重要的参考意义。在一打得组下段发现了晚吉维亚期的牙形类,在一打得组中段发现了弗拉斯期的牙形类,因而,一打得组属于中泥盆世晚期至晚泥盆世早期的沉积,中泥盆统上泥盆统界线大致位于一打得组下—中段之间;整个一打得组大致对应于牙形类Schmidtognathus hermanni带—Palmatolepis hassi带,这意味着一打得组沉积的开始与国际上的Geneseo事件一致,代表一次重要的海平面上升事件。The Panxi section is an important reference section for Devonian stratigraphy in South China. It is characterized by open platform-platform margin-(partly) restricted platform facies deposits, yielding abundant benthic fossils including corals, brachiopods and others. In addition, the Yidade Formation bears common thin-shelled tentaculites and conodonts, which can facilitate biostratigraphic correlation and age determination in the shallow water strata across the Middle and Upper Devonian boundary. Upper Givetian and Frasnian conodonts (e.g., Polygnathus linguiformis klapperi, Po. l. weddigei, Po. cristatus ectypus, Ad. rotundiloba, and Mesotaxis costalliformis) have been discovered for the first time from the Lower and Middle members of the Yidade Formation, respectively. The Yidade Formation ranges approximately from the start of the Schmidtog- nathus hermanni Zone through the Palmatolepis bassi Zone.

关 键 词:生物地层 牙形类 一打得组 吉维阶 弗拉斯阶 泥盆系 盘溪 云南 

分 类 号:P534.44[天文地球—古生物学与地层学]

 

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