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Formation of high 18O fayalite-bearing A-type granite by high-temperature melting of granulitic metasedimentary rocks, southern China

2011; Geological Society of America; Volume: 39; Issue: 10 Linguagem: Inglês

10.1130/g32080.1

1943-2682

Hui-Qing Huang, X.-H. Li, W.-X. Li, Zheng‐Xiang Li,

High-pressure geophysics and materials

Research Article| October 01, 2011 Formation of high δ18O fayalite-bearing A-type granite by high-temperature melting of granulitic metasedimentary rocks, southern China Hui-Qing Huang; Hui-Qing Huang 1State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China2The Institute for Geoscience Research (TIGeR), Department of Applied Geology, Curtin University, GPO Box U1987, Perth, WA 6845, Australia3Graduate School of Chinese Academy of Sciences, Beijing 100039, China Search for other works by this author on: GSW Google Scholar Xian-Hua Li; Xian-Hua Li * 4State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China *E-mail: lixh@gig.ac.cn. Search for other works by this author on: GSW Google Scholar Wu-Xian Li; Wu-Xian Li 1State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China Search for other works by this author on: GSW Google Scholar Zheng-Xiang Li Zheng-Xiang Li 2The Institute for Geoscience Research (TIGeR), Department of Applied Geology, Curtin University, GPO Box U1987, Perth, WA 6845, Australia Search for other works by this author on: GSW Google Scholar Geology (2011) 39 (10): 903–906. https://doi.org/10.1130/G32080.1 Article history received: 17 Jan 2011 rev-recd: 20 Apr 2011 accepted: 25 Apr 2011 first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Hui-Qing Huang, Xian-Hua Li, Wu-Xian Li, Zheng-Xiang Li; Formation of high δ18O fayalite-bearing A-type granite by high-temperature melting of granulitic metasedimentary rocks, southern China. Geology 2011;; 39 (10): 903–906. doi: https://doi.org/10.1130/G32080.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract The genesis of A-type granites has been controversial. Fayalite granite is a member of the most reduced A-type granites, commonly thought to have been primarily sourced from tholeiitic rocks. In this paper we report petrography, whole-rock geochemistry, Sr-Nd isotope, and in situ zircon Hf-O isotope results for a fayalite-bearing A-type granite suite at Jiuyishan in southern China. High zircon δ18O (8.0‰–9.8‰), negative zircon εHf(t) (–6.2 to –2.3), and evolved whole-rock Sr-Nd isotopes (ISr = 0.7151–0.7181; εNd(t) = –7.4 to –6.6) indicate the reworking of old supracrustal rocks. Isotopic and geochemical results, particularly downward inflections of Zr and Ba at ∼70 wt% SiO2, point to fractional crystallization rather than magma mixing as the controlling process for the evolution of the igneous suite. Integrated petrological, geochemical, and isotopic studies present the first convincing case that reduced A-type granites can also be generated by high-temperature (>960 °C) melting of granulitic metasedimentary rocks, likely related to the upwelling of the asthenosphere and/or underplating and intrusion of basaltic melts. We emphasize that key factors for the genesis of this unique rock type are low oxygen fugacity (fO2), low fH2O, and high temperature. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.