Permo-Carboniferous Radiolarians from the Wupataerkan Group,Western South Tianshan,Xinjiang,China

The Wupata'erkan Group, also called Wupata'erkan Formation, distributed in the South Tianshan, Xinjiang,China, mainly consists of gray and dark gray fine-grained clastic rocks, interlayered with volcanic rocks, carbonates and cherts. Some ultra-basic rocks (blocks) punctuate the formation. The formation was variously assigned to Silurian-Middle Devonian, Silurian-Lower Devonian, and pre-Devonian, mainly based on Atrypa bodini Mansuy, Hypothyridina parallelepipedia (Brour.) and Prismatophyllum hexagonum Yoh collected from the limestone interlayers, respectively.However, radiolarian fossils obtained from 24 chert specimens of the Wupata'erkan Group, mainly include Albaillella sp.cf. A. undulata Deflandre, Albaillella sp. cf. A. paradoxa Deflandre, Albaillella cf. A. deflandrei Gourmelon, Albaillella sp. cf. A. indensis Won, Albaillella sp. cf. A. excelsa Ishiga, Kito and Imoto, Albaillella sp. and Latentifistulidae gen. et. sp.indet., are earliest Carboniferous and Late Permian. The earliest Carboniferous assemblage is characterized by Albaillella sp. cf. A. undulata Deflandre, Albaillella sp. cf. A. paradoxa Deflandre, Albaillella cf. A. deflandrei Gourmelon and Albaillella sp. cf. A. indensis Won, and the Late Permian assemblage by Albaillella sp. cf. A. excelsa Ishiga, Kito and Imoto. This new stratigraphic evidence indicates that the Wupata'erkan Group is possibly composed of rocks with different ages from Silurian to Permian, and therefore, it is probably an ophiolite melange. The discovery of Late Permian Albaillella sp. cf. A. excelsa provides more reliable evidence supporting the existence of a Permian relic ancient oceanic basin in the western part of Xinjiang South Tianshan.

作 者： Li Yuejun Sun Longde Wu Haoruo ZHANG Guangya Wang Guolin Huang Zhibin   作者單位： Li Yuejun,Wu Haoruo(Institute of Geology and Geophysics, Chinese Academy of Sciences,Beijing 100029)

Sun Longde,ZHANG Guangya,Wang Guolin,Huang Zhibin(Tarim Oilfield Company, Petro China, Korla, Xinjiang 841000) 

刊 名： 地質(zhì)學(xué)報(英文版)  SCI 英文刊名： ACTA GEOLOGICA SINICA  年，卷(期)： 2005 79(1)  分類號：   關(guān)鍵詞： radiolaria   Early Carboniferous   Late Permian   ophiolite mélange   Wupata'erkan Group   western South Tianshan   Xinjiang