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Metasedimentary melting in the formation of charnockite: Petrological and zircon U-Pb-Hf-O isotope evidence from the Darongshan S-type granitic complex in southern China

文献类型：期刊论文

作者Jiao, Shu-Juan1; Li, Xian-Hua1; Huang, Hui-Qing1,2; Deng, Xi-Guang3
刊名LITHOS
出版日期2015-12-15
卷号239页码:217-233
关键词Cordierite Granite Charnockite Zircon Monazite Hf-o Isotopes Darongshan
DOI10.1016/j.lithos.2015.10.004
文献子类Article
英文摘要Charnockites are Opx-bearing igneous rocks commonly found in high-grade metamorphic terranes. Despite being volumetrically minor, they show a wide range in both bulk geochemistry and intensive parameters. They form a characteristic component of the AMCG (anorthosite-mangerite-charnockite-granite) suite, but their association with typical S-type granites is less well-known. The Darongshan S-type granitic complex (DSGC) in Guangxi Province, southern China, contains granites varying in mafic silicate mineral assemblages from Bt + Crd (Darongshan suite) to Opx + Grt + Bt + Crd (Jiuzhou suite) and Opx + Crd +/- Bt (Taima suite), corresponding to a geochemical transition from magnesian calc-alkalic to ferroan calc-alkalic. However, its genesis, even the accurate age of intrusion, remains highly contentious despite intensive research. In order to understand the genesis of charnockite and its genetic relationship with S-type granite; here, we first determined zircon U-Pb ages of each suite using a SIMS on the basis of a detailed petrological study. Zircon U-Pb ages show that all suites of the complex were emplaced contemporaneously at ca. 249 Ma. Monazite apparent U-Pb ages are indistinguishable from zircon U-Pb ages within analytical error. Further in situ zircon Hf-O isotope analyses reveal that the granitic complex was dominantly derived from reduced melting metasedimentary rocks (delta O-18(zircon) = Ca. 11 parts per thousand; epsilon Hf(t)(zircon) = ca. -10; Delta log FMQ <= 0; Mn in apatite oxybarometer) with rare material input from the mantle. The variation in delta O-18 (7.8 parts per thousand-12.9 parts per thousand.) is more likely a result of hybridization, whereas that in epsilon(Hf)(t) (-31.9 to -1.8) is a result of both hybridization and disequilibrium melting. The variation in mineralogy and geochemistry may be interpreted as a result of entrainment of peritectic garnets from biotite-dehydration melting. Nevertheless, heat input from mantle through basaltic intrusion/underplating is considered to play a major role in high-temperature (>850 degrees C) melting at mid-crustal levels (i.e. the cordierite stable field) for generation of the granitic complex. We interpret that the granites were intruded in a back-arc setting and basaltic magmatism was directly associated with slab roll-back and tearing during the latest Permian and early Triassic times. (C) 2015 Elsevier B.V. All rights reserved.
WOS关键词LARGE IGNEOUS PROVINCE ; A-TYPE GRANITES ; HAINAN ISLAND ; GRANULITE ENCLAVES ; TECTONIC EVOLUTION ; CONTINENTAL-CRUST ; CATHAYSIA BLOCKS ; EAST ANTARCTICA ; PERALUMINOUS GRANITES ; INDOSINIAN GRANITES
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000366770700015
资助机构Ministry of Science and Technology of China(2012CB416702) ; Ministry of Science and Technology of China(2012CB416702) ; Ministry of Science and Technology of China(2012CB416702) ; Ministry of Science and Technology of China(2012CB416702) ; China Postdoctoral Science Foundation(2013M540137) ; China Postdoctoral Science Foundation(2013M540137) ; China Postdoctoral Science Foundation(2013M540137) ; China Postdoctoral Science Foundation(2013M540137) ; Ministry of Science and Technology of China(2012CB416702) ; Ministry of Science and Technology of China(2012CB416702) ; Ministry of Science and Technology of China(2012CB416702) ; Ministry of Science and Technology of China(2012CB416702) ; China Postdoctoral Science Foundation(2013M540137) ; China Postdoctoral Science Foundation(2013M540137) ; China Postdoctoral Science Foundation(2013M540137) ; China Postdoctoral Science Foundation(2013M540137)
源URL[http://ir.iggcas.ac.cn/handle/132A11/62135]  
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, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
2.Univ Newcastle, Sch Environm & Life Sci, NSW Inst Frontiers Geosci, Callaghan, NSW 2308, Australia
3.China Geol Survey, Guangzhou Marine Geol Survey, Guangzhou 510760, Guangdong, Peoples R China
推荐引用方式
GB/T 7714		 Jiao, Shu-Juan,Li, Xian-Hua,Huang, Hui-Qing,et al. Metasedimentary melting in the formation of charnockite: Petrological and zircon U-Pb-Hf-O isotope evidence from the Darongshan S-type granitic complex in southern China[J]. LITHOS,2015,239:217-233.
APA Jiao, Shu-Juan,Li, Xian-Hua,Huang, Hui-Qing,&Deng, Xi-Guang.(2015).Metasedimentary melting in the formation of charnockite: Petrological and zircon U-Pb-Hf-O isotope evidence from the Darongshan S-type granitic complex in southern China.LITHOS,239,217-233.
MLA Jiao, Shu-Juan,et al."Metasedimentary melting in the formation of charnockite: Petrological and zircon U-Pb-Hf-O isotope evidence from the Darongshan S-type granitic complex in southern China".LITHOS 239(2015):217-233.

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来源：地质与地球物理研究所

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