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  4. 岩石圈演化国家重点实验室
Age and origin of accreted ocean plate stratigraphy in the North Qilian belt, NE Tibet Plateau: evidence from microfossils and geochemistry of cherts and siltstones

文献类型：期刊论文

作者Yan, Zhen4; Xiao, Wenjiao2,3; Aitchison, Jonathan C.5; Yuan, Chao1; Liu, Chuanzhou2; Fu, Changlei4
刊名JOURNAL OF THE GEOLOGICAL SOCIETY
出版日期2021-06-08
页码12
ISSN号0016-7649
DOI10.1144/jgs2020-231
英文摘要The accretionary complex (AC) in the North Qilian belt comprises coherent and chaotic units consisting of bedded cherts, pelagic mudstone, shale, turbidites, basalt, limestone, blueschist, eclogite lenses and ophiolitic melange. Cherts from the Donggoukou and Biandukou outcrops in the north of the blueschist belt contain abundant Middle Ordovician radiolarians together with rare conodonts. Well-preserved radiolarians also occur in cherts associated with high-pressure/low-temperature rocks in the Baijingsi AC outcrop. Conodonts of Floian-Dapingian age and Middle Ordovician radiolarians also occur in the Shihuigou AC. Geochemical analysis of 23 cherts reveals variable SiO2 contents (74.56-97.16 wt%) and high mean Al/(Al + Fe + Mn) ratios ranging from 0.35 to 0.85, indicating a non-hydrothermal origin. Ce/Ce* and La-N/Yb-N ratios of 0.70-1.22 and 0.67-1.59 respectively are high and variable, similar to those of associated muddy siltstone (0.59-0.96 and 1.14-1.55, respectively), suggesting near-trench deposition with associated terrigenous input. Together with the metamorphic ages of blueschists and eclogites, the North Qilian belt AC formed by accretion of ocean plate stratigraphic successions in response to subduction of the Proto-Tethyan Ocean prior to 450 Ma.
WOS关键词DETRITAL-ZIRCON GEOCHRONOLOGY ; RARE-EARTH-ELEMENTS ; U-PB ; NW CHINA ; DEPOSITIONAL-ENVIRONMENTS ; TECTONIC ENVIRONMENT ; OPHIOLITE COMPLEX ; ORDOVICIAN CHERTS ; SOUTHERN UPLANDS ; TRACE-ELEMENTS
资助项目National Natural Science Foundation of China[41872241] ; National Natural Science Foundation of China[41672221] ; China Geological Survey[DD20190006] ; China Geological Survey[DD20160201-04] ; China Geological Survey[DD20160022-02]
WOS研究方向Geology
语种英语
WOS记录号WOS:000662323300001
出版者GEOLOGICAL SOC PUBL HOUSE
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Geological Survey ; China Geological Survey ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Geological Survey ; China Geological Survey ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Geological Survey ; China Geological Survey ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Geological Survey ; China Geological Survey
源URL[http://ir.iggcas.ac.cn/handle/132A11/102066]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Yan, Zhen
作者单位1.Chinese Acad Sci, Guangzhou Inst Geochem, Guangzhou 410640, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
3.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Urumqi 830011, Peoples R China
4.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
5.Univ Queensland, Sch Earth & Environm Sci, Brisbane, Qld 4072, Australia
推荐引用方式
GB/T 7714		 Yan, Zhen,Xiao, Wenjiao,Aitchison, Jonathan C.,et al. Age and origin of accreted ocean plate stratigraphy in the North Qilian belt, NE Tibet Plateau: evidence from microfossils and geochemistry of cherts and siltstones[J]. JOURNAL OF THE GEOLOGICAL SOCIETY,2021:12.
APA Yan, Zhen,Xiao, Wenjiao,Aitchison, Jonathan C.,Yuan, Chao,Liu, Chuanzhou,&Fu, Changlei.(2021).Age and origin of accreted ocean plate stratigraphy in the North Qilian belt, NE Tibet Plateau: evidence from microfossils and geochemistry of cherts and siltstones.JOURNAL OF THE GEOLOGICAL SOCIETY,12.
MLA Yan, Zhen,et al."Age and origin of accreted ocean plate stratigraphy in the North Qilian belt, NE Tibet Plateau: evidence from microfossils and geochemistry of cherts and siltstones".JOURNAL OF THE GEOLOGICAL SOCIETY (2021):12.

入库方式： OAI收割

来源：地质与地球物理研究所

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