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Late Silurian-early Devonian adakitic granodiorite, A-type and I-type granites in NW Junggar, NW China: Partial melting of mafic lower crust and implications for slab roll-back

文献类型：期刊论文

作者Yin, Jiyuan1,2; Chen, Wen1; Xiao, Wenjiao2,3,4; Yuan, Chao5; Windley, Brian F.6; Yu, Shun1; Cai, Keda4
刊名GONDWANA RESEARCH
出版日期2017-03-01
卷号43页码:55-73
关键词A-type Granite I-type Granite Adakitic Granodiorite Slab Roll-back Nw Junggar Crustal Growth
ISSN号1342-937X
DOI10.1016/j.gr.2015.06.016
文献子类Article
英文摘要Late Silurian-early Devonian magmatismof theNWJunggar region in the Central Asian Orogenic Belt provides a critical geological record that is important for unraveling regional tectonic history and constraining geodynamic processes. In this study, we report results of Zircon U-Pb ages and systematic geochemical data for late Silurian-early Devonian largely granitic rocks in NW Junggar, aiming to constrain their emplacement ages, origin and geodynamic significance. The magmatism consists of a variety of mafic to felsic intrusions and volcanic rocks, e.g. adakitic granodiorite, K-feldspar granite, syenitic granite, gabbro and rhyrolite. U-Pb zircon ages suggest that the granitoids and gabbros were emplaced in the late Silurian-early Devonian (420-405 Ma). Adakitic granodiorites are calc-alkaline, characterized by high Sr (407-532 ppm), low Y (12.2-14.7 ppm), Yb (1.53-1.77 ppm), Cr (mostly <8.00 ppm), Co (mostly <11.0 ppm) and Ni (mostly b4.10 ppm) and relatively high Sr/Y (31-42) ratios, analogous to those of modern adakites. K-feldspar granites and rhyolites are characterized by alkali- and Fe-enriched, with high Zr, Nb and Ga/Al ratios, geochemically similar to those of A-type granites. Syenitic granites show high alkaline (Na2O + K2O = 8.39-9.34 wt.%) contents, low Fe-# values (0.73-0.80) and are weakly peraluminous (A/CNK = 1.00-1.07). Gabbros are characterized by low MgO (6.86-7.15 wt.%), Mg-# (52-53), Cr (124-133 ppm) and Ni (84.7-86.6 ppm) contents. The geochemical characteristics of the gabbroic samples show affinity to both MORB-and arc-like sources. All granitoids have positive epsilon Nd(t) (+ 3.9 to + 6.9) and zircon epsilon Hf(t) (+9.8 to +15.2) values and low initial Sr-87/Sr-86 ratios (0.7035-0.7043), with young T-DM(Nd) (605-791 Ma) and T-DM(Hf) (425-773 Ma) ages, suggesting significant addition of juvenile material. The adakitic granodiorites probably resulted from partial melting of mafic lower crust, leaving an amphibolite and garnet residue. The K-feldspar granites, rhyolites and syenitic granites probably formed frompartial melting of the Xiemisitai mid-lower crust, while the gabbroic intrusion was probably generated by interactions between asthenospheric and metasomatized lithospheric mantle. Voluminous plutons of various types (adakites, A-type granites, I-type granites, and gabbros) formed during 420-405 Ma, and their isotopic data suggest significant additions of juvenile material. We propose that a slab roll-back model can account for the 420-405 Ma magmatic "flare up" in NWJunggar as well as an extensional setting. (C) 2015 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
WOS关键词ASIAN OROGENIC BELT ; ZIRCON U-PB ; NORTHERN WEST JUNGGAR ; UNDERPLATED BASALTIC CRUST ; THICKENED LOWER CRUST ; HF ISOTOPE EVIDENCE ; TECTONIC IMPLICATIONS ; NORTHWEST CHINA ; SR-ND ; ACCRETIONARY OROGENESIS
WOS研究方向Geology
语种英语
WOS记录号WOS:000397874200005
出版者ELSEVIER SCIENCE BV
资助机构Major Basic Research Project of the Ministry of Science and Technology of China(2014CB448000) ; Major Basic Research Project of the Ministry of Science and Technology of China(2014CB448000) ; National Science Foundation of China(41390441 ; National Science Foundation of China(41390441 ; China Scholarship Council(201409110006) ; China Scholarship Council(201409110006) ; China Postdoctoral Science Foundation(2014M560113 ; China Postdoctoral Science Foundation(2014M560113 ; Chinese Ministry of Land and Resources(201211074-05) ; Chinese Ministry of Land and Resources(201211074-05) ; China Geological Survey(12120113015600) ; China Geological Survey(12120113015600) ; Outlay Research Fund of Institute of Geology, Chinese Academy of Geological Sciences(J1517) ; Outlay Research Fund of Institute of Geology, Chinese Academy of Geological Sciences(J1517) ; 41473053 ; 41473053 ; 2015T80134) ; 2015T80134) ; 41203026 ; 41203026 ; 41573045 ; 41573045 ; 41273012 ; 41273012 ; 41230207 ; 41230207 ; 41373034 ; 41373034 ; 41190075) ; 41190075) ; Major Basic Research Project of the Ministry of Science and Technology of China(2014CB448000) ; Major Basic Research Project of the Ministry of Science and Technology of China(2014CB448000) ; National Science Foundation of China(41390441 ; National Science Foundation of China(41390441 ; China Scholarship Council(201409110006) ; China Scholarship Council(201409110006) ; China Postdoctoral Science Foundation(2014M560113 ; China Postdoctoral Science Foundation(2014M560113 ; Chinese Ministry of Land and Resources(201211074-05) ; Chinese Ministry of Land and Resources(201211074-05) ; China Geological Survey(12120113015600) ; China Geological Survey(12120113015600) ; Outlay Research Fund of Institute of Geology, Chinese Academy of Geological Sciences(J1517) ; Outlay Research Fund of Institute of Geology, Chinese Academy of Geological Sciences(J1517) ; 41473053 ; 41473053 ; 2015T80134) ; 2015T80134) ; 41203026 ; 41203026 ; 41573045 ; 41573045 ; 41273012 ; 41273012 ; 41230207 ; 41230207 ; 41373034 ; 41373034 ; 41190075) ; 41190075) ; Major Basic Research Project of the Ministry of Science and Technology of China(2014CB448000) ; Major Basic Research Project of the Ministry of Science and Technology of China(2014CB448000) ; National Science Foundation of China(41390441 ; National Science Foundation of China(41390441 ; China Scholarship Council(201409110006) ; China Scholarship Council(201409110006) ; China Postdoctoral Science Foundation(2014M560113 ; China Postdoctoral Science Foundation(2014M560113 ; Chinese Ministry of Land and Resources(201211074-05) ; Chinese Ministry of Land and Resources(201211074-05) ; China Geological Survey(12120113015600) ; China Geological Survey(12120113015600) ; Outlay Research Fund of Institute of Geology, Chinese Academy of Geological Sciences(J1517) ; Outlay Research Fund of Institute of Geology, Chinese Academy of Geological Sciences(J1517) ; 41473053 ; 41473053 ; 2015T80134) ; 2015T80134) ; 41203026 ; 41203026 ; 41573045 ; 41573045 ; 41273012 ; 41273012 ; 41230207 ; 41230207 ; 41373034 ; 41373034 ; 41190075) ; 41190075) ; Major Basic Research Project of the Ministry of Science and Technology of China(2014CB448000) ; Major Basic Research Project of the Ministry of Science and Technology of China(2014CB448000) ; National Science Foundation of China(41390441 ; National Science Foundation of China(41390441 ; China Scholarship Council(201409110006) ; China Scholarship Council(201409110006) ; China Postdoctoral Science Foundation(2014M560113 ; China Postdoctoral Science Foundation(2014M560113 ; Chinese Ministry of Land and Resources(201211074-05) ; Chinese Ministry of Land and Resources(201211074-05) ; China Geological Survey(12120113015600) ; China Geological Survey(12120113015600) ; Outlay Research Fund of Institute of Geology, Chinese Academy of Geological Sciences(J1517) ; Outlay Research Fund of Institute of Geology, Chinese Academy of Geological Sciences(J1517) ; 41473053 ; 41473053 ; 2015T80134) ; 2015T80134) ; 41203026 ; 41203026 ; 41573045 ; 41573045 ; 41273012 ; 41273012 ; 41230207 ; 41230207 ; 41373034 ; 41373034 ; 41190075) ; 41190075)
源URL[http://ir.iggcas.ac.cn/handle/132A11/52991]  
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Yin, Jiyuan
作者单位1.Chinese Acad Geol Sci, Inst Geol, Lab Isotope Thermochronol, State Key Lab Continental Tecton & Dynam, Beijing 100037, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
3.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
4.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Xinjiang Res Ctr Mineral Resources, Urumqi 830011, Peoples R China
5.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Peoples R China
6.Univ Leicester, Dept Geol, Leicester LE1 7RH, Leics, England
推荐引用方式
GB/T 7714		 Yin, Jiyuan,Chen, Wen,Xiao, Wenjiao,et al. Late Silurian-early Devonian adakitic granodiorite, A-type and I-type granites in NW Junggar, NW China: Partial melting of mafic lower crust and implications for slab roll-back[J]. GONDWANA RESEARCH,2017,43:55-73.
APA Yin, Jiyuan.,Chen, Wen.,Xiao, Wenjiao.,Yuan, Chao.,Windley, Brian F..,...&Cai, Keda.(2017).Late Silurian-early Devonian adakitic granodiorite, A-type and I-type granites in NW Junggar, NW China: Partial melting of mafic lower crust and implications for slab roll-back.GONDWANA RESEARCH,43,55-73.
MLA Yin, Jiyuan,et al."Late Silurian-early Devonian adakitic granodiorite, A-type and I-type granites in NW Junggar, NW China: Partial melting of mafic lower crust and implications for slab roll-back".GONDWANA RESEARCH 43(2017):55-73.

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