| Permo-Carboniferous Radiolarians from the Wupata'erkan Group,Western South Tianshan, Xinjiang, China |
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| 作者姓名： | LI Yuejun SUN Longde WU Haoruo ZHANG Guangya WANG Guolin and HUANG Zhibin Institute of Geology and Geophysics Chinese Academy of Sciences Beijing Tarim Oilfield Company PetroChina Korla Xinjiang |
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| 作者单位： | LI Yuejun1，SUN Longde2，WU Haoruo1，ZHANG Guangya2，WANG Guolin 2 and HUANG Zhibin 2 1 Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100029; 2 Tarim Oilfield Company，PetroChina，Korla，Xinjiang 841000 |
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| 摘 要： | 1 IntroductionThe Wupata'erkan Group, also called Wupata'erkanFormation (Wang et al., 1990), in the western SouthTianshan, China (Fig. 1), mainly comprises gray and darkgray fine-grained clastic rocks, interlayered with medium-acidic volcanic rocks (andesite and quartz porphyry),carbonates, cherts and variegated tuffaceousconglomerates. The chert in the formation was firstly foundin our field trip along sections of the Qiqi'erjianakesu Riverand Kekebiele Daban. Deformation of the group is…
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| 关 键 词： | ophiolite mélange |
Permo-Carboniferous Radiolarians from the Wupata'erkan Group,Western South Tianshan,Xinjiang,China |
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| Authors: | Li Yuejun Sun Longde Wu Haoruo ZHANG Guangya Wang Guolin Huang Zhibin |
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| Abstract: | 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. |
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| Keywords: | radiolaria Early Carboniferous Late Permian Wupata'erkan Group western South Tianshan Xinjiang |
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