中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 地质与地球物理研究所
  3. 中国科学院地质与地球物理研究所
Field geology, geochronology and geochemistry of mafic-ultramafic rocks from Alxa, China: Implications for Late Permian accretionary tectonics in the southern Altaids

文献类型：期刊论文

作者Feng, Jianyun1,2; Xiao, Wenjiao1,3; Windley, Brian4; Han, Chunming1,3; Wan, Bo1; Zhang, Ji'en1; Ao, Songjian1; Zhang, Zhiyong1; Lin, Lina1,2
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2013-12-15
卷号78页码:114-142
关键词Altaids Alxa Mafic-ultramafic rocks Accretionary tectonics Ridge subduction Late Permian
ISSN号1367-9120
DOI10.1016/j.jseaes.2013.01.020
文献子类Article
英文摘要The time of termination of orogenesis for the southern Altaids has been controversial. Systematic investigations of field geology, geochronology and geochemistry on newly discriminated mafic-ultramafic rocks from northern Alxa in the southern Altaids were conducted to address the termination problem. The mafic-ultramafic rocks are located in the Bijiertai, Honggueryulin, and Qinggele areas, stretching from west to east for about 100 km. All rocks occur high-grade gneisses as tectonic lenses that are composed of peridotite, pyroxenite, gabbro, and serpentinite, most of which have undergone pronounced alteration, i.e., serpentinization and chloritization. Geochemically, the rocks are characterized by uniform compositional trends, i.e., with low SiO2-contents (42.51-52.21 wt.%) and alkalinity (Na2O + K2O) (0.01-5.45 wt.%, mostly less than 0.8 wt.%), and enrichments in MgO (7.37-43.36 wt.%), with Mg# = 52.75-91.87. As the rocks have been strongly altered and have a wide range of loss-on-ignition (LOI: 0.44-14.07 wt.%) values, they may have been subjected to considerable alteration by either seawater or meta-morphic fluids. The REE and trace element patterns show a relatively fractionated trend with LILE enrichment and HFSE depletion, similar to that of T-MORB between N-MORB and E-MORB, indicating that the parental melt resulted from the partial melting of oceanic lithospheric mantle overprinted by fluid alteration of island-arc origin. The ultramafic rocks are relics derived from the magma after a large degree of partial melting of oceanic lithospheric mantle with superposed island arc processes under the influence of mid-ocean-ridge magmatism. LA-ICP MS U-Pb zircon ages of gabbros from three spots are 274 +/- 3 Ma (MSWD = 0.35), 306 +/- 3 Ma (MSWD = 0.49), 262 +/- 5 Ma (MSWD = 1.2), respectively, representing the formation ages of the mafic-ultramafic rocks. Therefore, considering other previously published data, we suggest that the mafic-ultramafic rocks were products of south-dipping subduction, most probably with a slab window caused by ridge subduction, of the Paleo-Asian Ocean plate beneath the Alxa block in the Late Carboniferous to Late Permian before the Ocean completely closed. This sheds light on the controversial tectonic history of the southern Altaids and supports the concept that the termination of orogenesis was in the end-Permian to Triassic. (C) 2013 Elsevier Ltd. All rights reserved.
WOS关键词ASIAN OROGENIC BELT ; RIDGE-TRENCH COLLISION ; SLAB WINDOW MAGMATISM ; U-PB ; INNER-MONGOLIA ; NORTHERN MARGIN ; PALEOPROTEROZOIC EVOLUTION ; TECTONOTHERMAL EVENTS ; PALEOZOIC TECTONICS ; CONTINENTAL-CRUST
WOS研究方向Geology
语种英语
WOS记录号WOS:000327804600009
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National Natural Science Foundation of China(41230207 ; National Natural Science Foundation of China(41230207 ; National Natural Science Foundation of China(41230207 ; National Natural Science Foundation of China(41230207 ; Hundred Talent Program B of the Chinese Academy of Sciences ; Hundred Talent Program B of the Chinese Academy of Sciences ; Hundred Talent Program B of the Chinese Academy of Sciences ; Hundred Talent Program B of the Chinese Academy of Sciences ; Chinese National Basic Research 973 Program(2007CB411307) ; Chinese National Basic Research 973 Program(2007CB411307) ; Chinese National Basic Research 973 Program(2007CB411307) ; Chinese National Basic Research 973 Program(2007CB411307) ; National 305 Projects(2011BAB06B04 ; National 305 Projects(2011BAB06B04 ; National 305 Projects(2011BAB06B04 ; National 305 Projects(2011BAB06B04 ; 40725009 ; 40725009 ; 40725009 ; 40725009 ; 2007BAB25B04) ; 2007BAB25B04) ; 2007BAB25B04) ; 2007BAB25B04) ; 41190071 ; 41190071 ; 41190071 ; 41190071 ; 41190072) ; 41190072) ; 41190072) ; 41190072) ; National Natural Science Foundation of China(41230207 ; National Natural Science Foundation of China(41230207 ; National Natural Science Foundation of China(41230207 ; National Natural Science Foundation of China(41230207 ; Hundred Talent Program B of the Chinese Academy of Sciences ; Hundred Talent Program B of the Chinese Academy of Sciences ; Hundred Talent Program B of the Chinese Academy of Sciences ; Hundred Talent Program B of the Chinese Academy of Sciences ; Chinese National Basic Research 973 Program(2007CB411307) ; Chinese National Basic Research 973 Program(2007CB411307) ; Chinese National Basic Research 973 Program(2007CB411307) ; Chinese National Basic Research 973 Program(2007CB411307) ; National 305 Projects(2011BAB06B04 ; National 305 Projects(2011BAB06B04 ; National 305 Projects(2011BAB06B04 ; National 305 Projects(2011BAB06B04 ; 40725009 ; 40725009 ; 40725009 ; 40725009 ; 2007BAB25B04) ; 2007BAB25B04) ; 2007BAB25B04) ; 2007BAB25B04) ; 41190071 ; 41190071 ; 41190071 ; 41190071 ; 41190072) ; 41190072) ; 41190072) ; 41190072) ; National Natural Science Foundation of China(41230207 ; National Natural Science Foundation of China(41230207 ; National Natural Science Foundation of China(41230207 ; National Natural Science Foundation of China(41230207 ; Hundred Talent Program B of the Chinese Academy of Sciences ; Hundred Talent Program B of the Chinese Academy of Sciences ; Hundred Talent Program B of the Chinese Academy of Sciences ; Hundred Talent Program B of the Chinese Academy of Sciences ; Chinese National Basic Research 973 Program(2007CB411307) ; Chinese National Basic Research 973 Program(2007CB411307) ; Chinese National Basic Research 973 Program(2007CB411307) ; Chinese National Basic Research 973 Program(2007CB411307) ; National 305 Projects(2011BAB06B04 ; National 305 Projects(2011BAB06B04 ; National 305 Projects(2011BAB06B04 ; National 305 Projects(2011BAB06B04 ; 40725009 ; 40725009 ; 40725009 ; 40725009 ; 2007BAB25B04) ; 2007BAB25B04) ; 2007BAB25B04) ; 2007BAB25B04) ; 41190071 ; 41190071 ; 41190071 ; 41190071 ; 41190072) ; 41190072) ; 41190072) ; 41190072) ; National Natural Science Foundation of China(41230207 ; National Natural Science Foundation of China(41230207 ; National Natural Science Foundation of China(41230207 ; National Natural Science Foundation of China(41230207 ; Hundred Talent Program B of the Chinese Academy of Sciences ; Hundred Talent Program B of the Chinese Academy of Sciences ; Hundred Talent Program B of the Chinese Academy of Sciences ; Hundred Talent Program B of the Chinese Academy of Sciences ; Chinese National Basic Research 973 Program(2007CB411307) ; Chinese National Basic Research 973 Program(2007CB411307) ; Chinese National Basic Research 973 Program(2007CB411307) ; Chinese National Basic Research 973 Program(2007CB411307) ; National 305 Projects(2011BAB06B04 ; National 305 Projects(2011BAB06B04 ; National 305 Projects(2011BAB06B04 ; National 305 Projects(2011BAB06B04 ; 40725009 ; 40725009 ; 40725009 ; 40725009 ; 2007BAB25B04) ; 2007BAB25B04) ; 2007BAB25B04) ; 2007BAB25B04) ; 41190071 ; 41190071 ; 41190071 ; 41190071 ; 41190072) ; 41190072) ; 41190072) ; 41190072)
源URL[http://ir.iggcas.ac.cn/handle/132A11/87430]  
专题中国科学院地质与地球物理研究所
通讯作者Xiao, Wenjiao
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Xinjiang Res Ctr Mineral Resources, Urumqi 830011, Peoples R China
4.Univ Leicester, Dept Geol, Leicester LE1 7RH, Leics, England
推荐引用方式
GB/T 7714		 Feng, Jianyun,Xiao, Wenjiao,Windley, Brian,et al. Field geology, geochronology and geochemistry of mafic-ultramafic rocks from Alxa, China: Implications for Late Permian accretionary tectonics in the southern Altaids[J]. JOURNAL OF ASIAN EARTH SCIENCES,2013,78:114-142.
APA Feng, Jianyun.,Xiao, Wenjiao.,Windley, Brian.,Han, Chunming.,Wan, Bo.,...&Lin, Lina.(2013).Field geology, geochronology and geochemistry of mafic-ultramafic rocks from Alxa, China: Implications for Late Permian accretionary tectonics in the southern Altaids.JOURNAL OF ASIAN EARTH SCIENCES,78,114-142.
MLA Feng, Jianyun,et al."Field geology, geochronology and geochemistry of mafic-ultramafic rocks from Alxa, China: Implications for Late Permian accretionary tectonics in the southern Altaids".JOURNAL OF ASIAN EARTH SCIENCES 78(2013):114-142.

入库方式： OAI收割

来源：地质与地球物理研究所

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。