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Late Devonian-Early Permian A-type granites in the southern Altay Range, Northwest China: Petrogenesis and implications for tectonic setting of "A(2)-type" granites

文献类型：期刊论文

作者Shen, Xiaoming1,2; Zhang, Haixiang1; Wang, Qiang1; Wyman, Derek A.3; Yang, Yueheng4
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2011-10-10
卷号42期号:5页码:986-1007
关键词A-type granite Ridge subduction Post-collision Altay Central Asian Orogenic Belt
ISSN号1367-9120
DOI10.1016/j.jseaes.2010.10.004
文献子类Article
英文摘要The Altay Range is an important part of the Central Asian Orogenic Belt (CAOB) that contains A-type granites that have been attributed to a post-collisional setting during the Late Carboniferous-Permian. However, our new LA-ICP-MS zircon U-Pb age data demonstrates that there were two episodes of A-type granite magmatism in the southern Altay Range. A Late Carboniferous to Early Permian (308-291 Ma) suite does occur in the vicinity of Qiakuerte but a distinct Late Devonian (382-367 Ma) suite is present in the Kouan area. The early Kouan A-type granites are mainly composed of alkali-feldspar granites, which are approximately synchronous with adakites, boninites, high-Ti basalts, picrites, ophiolitic rocks, and high temperature-low pressure metamorphic rocks, whereas the late Qiakuerte A-type granites mainly consist of arfvedsonite and aegirine-bearing granites, which are approximately coeval with some mafic-ultramafic rocks in the southern Altay Range. A-type granites are commonly classified as A(1) and A(2) sub-types, which are considered to be generated in anorogenic (rift or plume-related) or post-collisional settings, respectively. Both suites of the southern Altay Range are geochemically similar to typical A(2)-type granites, e.g., high K2O + Na2O, FeO/MgO, and Ga/Al, and Y/Nb values, and low CaO, Ba, Sr, and Eu contents. The Kouan A-type granites have relatively low (La/Yb)(N) (2.7-5.9), high epsilon(Nd)(t) (+6.7 to +7.7) and Nb/La (0.59-1.67), and variable epsilon(Hf)(t) (+5.0 to +14.1) values, whereas the Qiakuerte A-type granites have comparatively high (La/Vb)(N) (4.2-9.2), low epsilon(Nd)(t) (+5.3 to +6.0) and Nb/La (0.33-0.74), and variable epsilon(Hf)(t) (+10.0 to +18.7) values. The early Kouan A-type granites may have been generated by partial melting of a mafic source containing more depleted mantle-derived components than the late Qiakuerte A-type granites. We suggest that the Late Carboniferous to Early Permian Qiakuerte granites were formed in a post-collisional extensional setting, as is typical of A(2)-type granites. However, the Late Devonian Kouan A-type granites were more plausibly generated in an extensional setting as a result of slab window caused by a ridge subduction. In this case, the upwelling of asthenosphere through the slab window provided the source of parental magmas, or the heat for the generation of Devonian magmas. Therefore, our results suggest that A(2)-type granites can also form in a ridge subduction-related extensional setting. (C) 2010 Elsevier Ltd. All rights reserved.
WOS关键词PHANEROZOIC CRUSTAL GROWTH ; ASIAN OROGENIC BELT ; CARBONIFEROUS VOLCANIC-ROCKS ; NORTHERN SHERMAN BATHOLITH ; HF ISOTOPIC COMPOSITIONS ; NI SULFIDE DEPOSITS ; XINJIANG NW CHINA ; U-PB ZIRCON ; RIDGE SUBDUCTION ; GEOCHEMICAL CHARACTERISTICS
WOS研究方向Geology
语种英语
WOS记录号WOS:000296304700015
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构National Basic Research Program of China(2007CB411303) ; National Basic Research Program of China(2007CB411303) ; Chinese Academy of Sciences(KZCX2-YW-128) ; Chinese Academy of Sciences(KZCX2-YW-128) ; National Natural Science Foundation of China(41025006) ; National Natural Science Foundation of China(41025006) ; National Basic Research Program of China(2007CB411303) ; National Basic Research Program of China(2007CB411303) ; Chinese Academy of Sciences(KZCX2-YW-128) ; Chinese Academy of Sciences(KZCX2-YW-128) ; National Natural Science Foundation of China(41025006) ; National Natural Science Foundation of China(41025006) ; National Basic Research Program of China(2007CB411303) ; National Basic Research Program of China(2007CB411303) ; Chinese Academy of Sciences(KZCX2-YW-128) ; Chinese Academy of Sciences(KZCX2-YW-128) ; National Natural Science Foundation of China(41025006) ; National Natural Science Foundation of China(41025006) ; National Basic Research Program of China(2007CB411303) ; National Basic Research Program of China(2007CB411303) ; Chinese Academy of Sciences(KZCX2-YW-128) ; Chinese Academy of Sciences(KZCX2-YW-128) ; National Natural Science Foundation of China(41025006) ; National Natural Science Foundation of China(41025006)
源URL[http://ir.iggcas.ac.cn/handle/132A11/74084]  
专题中国科学院地质与地球物理研究所
通讯作者Zhang, Haixiang
作者单位1.Chinese Acad Sci, Key Lab Isotope Geochronol & Geochem, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
3.Univ Sydney, Sch Geosci, Div Geol & Geophys, Sydney, NSW 2006, Australia
4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Shen, Xiaoming,Zhang, Haixiang,Wang, Qiang,et al. Late Devonian-Early Permian A-type granites in the southern Altay Range, Northwest China: Petrogenesis and implications for tectonic setting of "A(2)-type" granites[J]. JOURNAL OF ASIAN EARTH SCIENCES,2011,42(5):986-1007.
APA Shen, Xiaoming,Zhang, Haixiang,Wang, Qiang,Wyman, Derek A.,&Yang, Yueheng.(2011).Late Devonian-Early Permian A-type granites in the southern Altay Range, Northwest China: Petrogenesis and implications for tectonic setting of "A(2)-type" granites.JOURNAL OF ASIAN EARTH SCIENCES,42(5),986-1007.
MLA Shen, Xiaoming,et al."Late Devonian-Early Permian A-type granites in the southern Altay Range, Northwest China: Petrogenesis and implications for tectonic setting of "A(2)-type" granites".JOURNAL OF ASIAN EARTH SCIENCES 42.5(2011):986-1007.

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来源：地质与地球物理研究所

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