Andesitic crustal growth via melange partial melting: Evidence from Early Cretaceous arc dioritic/andesitic rocks in southern Qiangtang, central Tibet
文献类型：期刊论文
| 作者 | Hao, Lu-Lu1,2; Wang, Qiang1,3; Wyman, Derek A.4; Ou, Quan1,2; Dan, Wei1; Jiang, Zi-Qi1,5; Yang, Jin-Hui6; Li, Jie1; Long, Xiao-Ping1 |
| 刊名 | GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
 |
| 出版日期 | 2016-05-01 |
| 卷号 | 17期号:5页码:1641-1659 |
| 关键词 | crustal growth melange subduction channel diorites andesites Qiangtang Tibet |
| DOI | 10.1002/2016GC006248 |
| 文献子类 | Article |
| 英文摘要 | Deciphering the petrogenesis of andesitic/dioritic rocks is fundamental to understanding the formation of the continental crust. Here we present detailed petrology, geochronology, major and trace element, Sr-Nd-Hf-O isotope data for the Early Cretaceous (approximate to 122 Ma) dioritic rocks in the Bizha area in southern Qiangtang, Tibet. The dioritic rocks are characterized by large ion lithophile elements, Pb, and light rare earth elements but depletion of high field strength elements with slightly enriched and variable epsilon Nd(t) values of -0.01 to -3.31 and initial Sr-87/Sr-86 isotopic ratios of 0.7053-0.7062. They also have variable magmatic zircon Hf-O isotope compositions (epsilon Hf(t)=-5.3 to +3.6 and O-18=+7.3 to +9.5 ). Combined with contemporary andesitic lavas in southern Qiangtang, we suggest that the intermediate magmatic rocks in this area were most probably derived by partial melting of a subduction melange, which is a mixture of mid-oceanic ridge basalts (MORBs), sediments, and mantle wedge peridotites, formed along the interface between the subducted slab and the overlying mantle wedge in a subduction channel before approximate to 124 Ma. The melange diapir melting was triggered by the asthenospheric upwelling and hot corner flow caused by roll-back of the northward subducted Bangong-Nujiang oceanic slab during the Early Cretaceous. The Early Cretaceous intermediate magmatic rocks in southern Qiangtang have an overall continental crust-like andesitic composition. Therefore, partial melting of melange provides an important support for the generation of andesitic magmas in continental arcs and the andesite model for crustal growth. |
| WOS关键词 | LITHOSPHERE-ASTHENOSPHERE INTERACTION ; PORPHYRY COPPER-DEPOSIT ; RICH MAFIC MAGMATISM ; U-PB GEOCHRONOLOGY ; SLAB ROLL-BACK ; CONTINENTAL-CRUST ; TECTONIC EVOLUTION ; SUBDUCTION ZONES ; NORTHERN TIBET ; INTRUSIVE ROCKS |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000379525100005 |
| 资助机构 | National Natural Science Foundation of China(41025006 ; National Natural Science Foundation of China(41025006 ; Chinese Academy of Sciences(XDB03010600) ; Chinese Academy of Sciences(XDB03010600) ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 project)(135TP201601) ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 project)(135TP201601) ; scientific and technical innovation-intersection and cooperation team program of Chinese Academy of Sciences ; scientific and technical innovation-intersection and cooperation team program of Chinese Academy of Sciences ; 41421062) ; 41421062) ; National Natural Science Foundation of China(41025006 ; National Natural Science Foundation of China(41025006 ; Chinese Academy of Sciences(XDB03010600) ; Chinese Academy of Sciences(XDB03010600) ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 project)(135TP201601) ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS 135 project)(135TP201601) ; scientific and technical innovation-intersection and cooperation team program of Chinese Academy of Sciences ; scientific and technical innovation-intersection and cooperation team program of Chinese Academy of Sciences ; 41421062) ; 41421062) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/53387]  |
| 专题 | 地质与地球物理研究所_岩石圈演化国家重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou, Guangdong, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing, Peoples R China 4.Univ Sydney, Sch Geosci, Sydney, NSW, Australia 5.Guilin Univ Technol, Sch Earth Sci, Guilin, Peoples R China 6.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Hao, Lu-Lu,Wang, Qiang,Wyman, Derek A.,et al. Andesitic crustal growth via melange partial melting: Evidence from Early Cretaceous arc dioritic/andesitic rocks in southern Qiangtang, central Tibet[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2016,17(5):1641-1659. |
| APA | Hao, Lu-Lu.,Wang, Qiang.,Wyman, Derek A..,Ou, Quan.,Dan, Wei.,...&Long, Xiao-Ping.(2016).Andesitic crustal growth via melange partial melting: Evidence from Early Cretaceous arc dioritic/andesitic rocks in southern Qiangtang, central Tibet.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,17(5),1641-1659. |
| MLA | Hao, Lu-Lu,et al."Andesitic crustal growth via melange partial melting: Evidence from Early Cretaceous arc dioritic/andesitic rocks in southern Qiangtang, central Tibet".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 17.5(2016):1641-1659. |
入库方式： OAI收割
来源：地质与地球物理研究所
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