中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Texture and composition of the Lajishankou accretionary wedge of the South Qilian belt, NW China

文献类型:期刊论文

作者Fu ChangLei1,2; Yan Zhen2; Wang ZongQi1; Niu ManLan3; Guo XianQing1; Yu LiangJun4; Li JiLiang4
刊名ACTA PETROLOGICA SINICA
出版日期2018
卷号34期号:7页码:2049-2064
关键词Accretionary wedge Melange Olistostrome Lajishan South Qilian belt
ISSN号1000-0569
英文摘要Detailed studies on the texture and composition of accretionary wedge/complex can provide important information on the evolution of ancient ocean basins and the reconstruction of ancient plate tectonics. The North Qilian belt contains multiple belts of accretionary complex and record Early Paleozoic subduction and closure processes of the Proto-Tethyan Ocean between the Alxa and Central Qilian blocks. However, the tectonic evolution of the South Qilian belt is still hotly debated. Recently, our geological mapping demonstrates that the Lajishankou accretionary complex of the South Qilian belt, which consists of highly foliated basalt, black and red chert, sandstone, mudstone, and melanges showing typical block-in-matrix fabric and is characterized by intense deformation recorded by duplex, thrust faults, rootless intrafolial folds, tight fold, and penetrative foliations, crops out structurally beneath the ophiolite complex. The melange is composed of various exotic or native blocks, including plagiogranite (561Ma), anorthosite (507Ma), dolerite, basalt, chert and sandstone, within a foliated fine-grained turbiditic matrix. The synsedimentary structures in matrix and sandstone blocks suggest an olistostromal origin for this melange. Spatially, the Lajishankou accretionary complex and the overlying ophiolite complex were thrust over turbidite of Qingshipo Formation and share the similar composition, deformation, spatial and temporal distribution with those in Angsiduo area. The accretionary complex, ophiolite, and the southern island arc rocks exposed in both Lajishankou and Angsiduo areas constitute a Cambrian-Early Ordovician trench-arc system within South Qilian belt during the Cambrian-Early Ordovician southward subduction of the South Qilian Ocean.
WOS关键词PALEOZOIC GRANITIC PLUTONS ; U-PB ; EVOLUTION ; ZIRCON ; GEOCHEMISTRY ; CONSTRAINTS ; ROCKS ; GEOCHRONOLOGY ; TERRANE ; MARGIN
WOS研究方向Geology
语种英语
WOS记录号WOS:000451724300014
出版者SCIENCE PRESS
源URL[http://ir.iggcas.ac.cn/handle/132A11/89608]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Yan Zhen
作者单位1.Chinese Acad Geol Sci, Inst Mineral Resources, MLR Key Lab Metallogeny & Mineral Assessment, Beijing 100037, Peoples R China
2.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
3.Hefei Univ Technol, Dept Resources & Environm, Hefei 230009, Anhui, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714
Fu ChangLei,Yan Zhen,Wang ZongQi,et al. Texture and composition of the Lajishankou accretionary wedge of the South Qilian belt, NW China[J]. ACTA PETROLOGICA SINICA,2018,34(7):2049-2064.
APA Fu ChangLei.,Yan Zhen.,Wang ZongQi.,Niu ManLan.,Guo XianQing.,...&Li JiLiang.(2018).Texture and composition of the Lajishankou accretionary wedge of the South Qilian belt, NW China.ACTA PETROLOGICA SINICA,34(7),2049-2064.
MLA Fu ChangLei,et al."Texture and composition of the Lajishankou accretionary wedge of the South Qilian belt, NW China".ACTA PETROLOGICA SINICA 34.7(2018):2049-2064.

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来源:地质与地球物理研究所

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