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Middle Paleozoic initial amalgamation and crustal growth in the West Junggar (NW China): Constraints from geochronology, geochemistry and Sr-Nd-Hf-Os isotopes of calc-alkaline and alkaline intrusions in the Xiemisitai-Saier Mountains

文献类型：期刊论文

作者Chen, Jia-Fu1,2,3,4; Han, Bao-Fu3; Zhang, Lei3; Xu, Zhao3; Liu, Jun-Lai4; Qu, Wen-Jun2; Li, Chao2; Yang, Jin-Hui5; Yang, Yue-Heng5
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2015-12-01
卷号113页码:90-109
关键词A-type Granite Post-collision West Junggar Late Silurian-middle Devonian Zircon U-pb Age Sr-nd-hf-os Isotopes
DOI10.1016/j.jseaes.2014.11.028
文献子类Article
英文摘要As one of the important parts of the Central Asian Orogenic Belt, the Early-Middle Paleozoic subduction-accretion history of the West Junggar is still needed to be further constrained although major progress has been made in the past years. In particular, the geodynamic setting for Late Silurian-Early Devonian A-type granites and associated mafic to felsic magmatism in the northern West Junggar is still controversial. In this study, we report new geochronological and geochemical results for Middle Paleozoic plutons in the Xiemisitai-Saier Mountains, northern West Junggar, including undeformed peralkaline granite, alkali feldspar granite, monzogranite, quartz syenite, syenite, monzodiorite, diorite, and hornblende gabbro. These plutons crop out in the eastern segment of the Early-Middle Paleozoic Boshchekul-Chingiz arc and invade into Early-Middle Paleozoic marine volcanic and pyroclastic sequences. New and published zircon U-Pb ages indicate that these intrusions were emplaced during the Late Silurian-Middle Devonian (424-392 Ma). Late Silurian hornblende gabbro, diorite, and monzodiorite commonly contain abundant hornblendes and exhibit mantle-like Nb/Ta ratios (15.9-18.7), negligible Eu anomalies, with primitive Sr-Nd-Hf [I(Sr) = 0.70370-0.70375, epsilon Nd(t) = +5.1 to +6.0 and epsilon Hf(t) = +14.3 to +16.21 and radiogenetic Os (I(Os) = 0.2099-0.8795) isotopic signatures. They may be originated from a fluid metasomatized, H2O-rich and isotopically depleted mantle source and suffered some crustal contamination. Early-Middle Devonian calc-alkaline monzogranite and alkaline-peralkaline granitoids may have distinct origins. The monzogranite is I-type granite with high La/Yb ratios, depleted epsilon Nd(t) values (+5.1), and crust-like Nb/Ta ratios (8.5-89), which is suggested to be partial melt of juvenile lower crust containing massive hornblende +/- garnet. The peralkaline-alkaline granitoids include A-type and highly fractionated I-type granites, which contain mafic-intermediate enclaves and chemically exhibit variable element ratios, analogical epsilon Nd(t) values (+5.1 to +6.2), and significantly high I(Os) value (2.1247). They are interpreted to be produced by fractional crystallization of the hybrid magma contributed from mantle and crustal sources.
WOS关键词A-TYPE GRANITES ; ASIAN OROGENIC BELT ; PHANEROZOIC CONTINENTAL GROWTH ; U-PB AGES ; TECTONIC IMPLICATIONS ; RIDGE SUBDUCTION ; NORTHWEST CHINA ; GEOLOGICAL SIGNIFICANCE ; GEODYNAMIC SIGNIFICANCE ; ACCRETIONARY OROGENS
WOS研究方向Geology
语种英语
WOS记录号WOS:000367406200008
资助机构National Natural Science Foundation of China(41072168 ; National Natural Science Foundation of China(41072168 ; Fundamental Research Funds for the Central Universities(2011YYL124) ; Fundamental Research Funds for the Central Universities(2011YYL124) ; (2013CSJ-K02) ; (2013CSJ-K02) ; 41202161 ; 41202161 ; 41472205) ; 41472205) ; National Natural Science Foundation of China(41072168 ; National Natural Science Foundation of China(41072168 ; Fundamental Research Funds for the Central Universities(2011YYL124) ; Fundamental Research Funds for the Central Universities(2011YYL124) ; (2013CSJ-K02) ; (2013CSJ-K02) ; 41202161 ; 41202161 ; 41472205) ; 41472205)
源URL[http://ir.iggcas.ac.cn/handle/132A11/62121]  
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.Northeastern Univ, Dept Geol, Coll Resources & Civil Engn, Shenyang 110819, Peoples R China
2.Chinese Acad Geol Sci, Key Lab Re Os Isotope Geochem, Beijing 100037, Peoples R China
3.Peking Univ, Minist Educ, Key Lab Orogen Belts & Crustal Evolut, Sch Earth & Space Sci, Beijing 100871, Peoples R China
4.China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Sch Earth Sci & Resources, Beijing 100083, Peoples R China
5.Chinese Acad Sci, State Key Lab Lithospher Evolut, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714		 Chen, Jia-Fu,Han, Bao-Fu,Zhang, Lei,et al. Middle Paleozoic initial amalgamation and crustal growth in the West Junggar (NW China): Constraints from geochronology, geochemistry and Sr-Nd-Hf-Os isotopes of calc-alkaline and alkaline intrusions in the Xiemisitai-Saier Mountains[J]. JOURNAL OF ASIAN EARTH SCIENCES,2015,113:90-109.
APA Chen, Jia-Fu.,Han, Bao-Fu.,Zhang, Lei.,Xu, Zhao.,Liu, Jun-Lai.,...&Yang, Yue-Heng.(2015).Middle Paleozoic initial amalgamation and crustal growth in the West Junggar (NW China): Constraints from geochronology, geochemistry and Sr-Nd-Hf-Os isotopes of calc-alkaline and alkaline intrusions in the Xiemisitai-Saier Mountains.JOURNAL OF ASIAN EARTH SCIENCES,113,90-109.
MLA Chen, Jia-Fu,et al."Middle Paleozoic initial amalgamation and crustal growth in the West Junggar (NW China): Constraints from geochronology, geochemistry and Sr-Nd-Hf-Os isotopes of calc-alkaline and alkaline intrusions in the Xiemisitai-Saier Mountains".JOURNAL OF ASIAN EARTH SCIENCES 113(2015):90-109.

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来源：地质与地球物理研究所

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