Ordovician radiolarians from the Yinisala ophiolitic melange and their significance in western Junggar, Xinjiang, NW China

The Yinisala ophiolitic melange is located in the southern part of the Xiemisitai Mountains in western Junggar （NW China）, and is composed of mafic-ultra mafic rocks, siliceous blocks, marble （marbleized limestone） and pyroclastic rocks, which all crop out as faulted blocks. Rich radiolarian and spo...

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Bibliographic Details
Published in:Science China. Earth sciences 2015-05, Vol.58 (5), p.776-783
Main Authors: Zong, RuiWen, Wang, ZiZhang, Gong, YiMing, Wang, GuoCan, Xiao, Long, Wang, ZhiHong, Fan, RuoYing
Format: Article
Language:English
Subjects:
Acanthicus
Cambrian
Deep water
Earth and Environmental Science
Earth Sciences
Fossils
Geochemistry
Geological time
Limestone
Marine environment
Mountains
Ordovician
Paleozoic
Radiolaria
Research Paper
Siliceous rocks
东准噶尔
中国西北部
奥陶系
放射虫
新疆
海绵骨针化石
蛇绿混杂岩带
西部
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Summary:The Yinisala ophiolitic melange is located in the southern part of the Xiemisitai Mountains in western Junggar （NW China）, and is composed of mafic-ultra mafic rocks, siliceous blocks, marble （marbleized limestone） and pyroclastic rocks, which all crop out as faulted blocks. Rich radiolarian and sponge spicule fossils are found in the siliceous rock for the first time. There are six genera of radiolarians （including one gen. et sp. Indet.） belonging to two families： Inaniguttid gen. et sp. Indet., Inani- gutta sp., Inanibigutta sp., Inanihella bakanasensis （Nazarov）, Triplococcus acanthicus （Danelian and Popov）, Antygopora sp., which are identified to be of late Early to Middle Ordovician age, representing the upper limit of the formation age of the Yinisala ophiolite melange. The ophiolites were developed in the Early Cambrian-Middle Ordovician oceanic environment, probably an important part of the early Paleozoic Paleo-Asian Ocean, based on the composition and structure of the siliceous rock and associated deep-water fossils. The Yinisala, Taerbahatai, and Hongguleleng ophiolitic melange belts can be correlated as a suite of unified subduction accretionary complex, which extends eastward to the eastern Junggar. We consider that there existed an ancient ocean connecting the east and west of northern Junggar in the Early Cambrian-Middle Ordovician.
ISSN:1674-7313
1869-1897
DOI:10.1007/s11430-014-4974-5