Cu isotopes reveal initial Cu enrichment in sources of giant porphyry deposits in a collisional setting
2018; Geological Society of America; Volume: 47; Issue: 2 Linguagem: Inglês
10.1130/g45362.1
ISSN1943-2682
AutoresYuanchuan Zheng, Sheng‐Ao Liu, Chang‐da Wu, William L. Griffin, Zhenqing Li, Bo Xu, Zhiming Yang, Zengqian Hou, Suzanne Y. O’Reilly,
Tópico(s)earthquake and tectonic studies
ResumoResearch Article| December 31, 2018 Cu isotopes reveal initial Cu enrichment in sources of giant porphyry deposits in a collisional setting Yuan-Chuan Zheng; Yuan-Chuan Zheng * 1State Key Laboratory of Geological Processes and Mineral Resources, and School of Earth Science and Resources, China University of Geosciences, Beijing 100083, People's Republic of China2ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS)–GEMOC, Macquarie University, Sydney, New South Wales 2109, Australia *E-mails: zhengyuanchuan@gmail.com; lsa@cugb.edu.cn Search for other works by this author on: GSW Google Scholar Sheng-Ao Liu; Sheng-Ao Liu * 1State Key Laboratory of Geological Processes and Mineral Resources, and School of Earth Science and Resources, China University of Geosciences, Beijing 100083, People's Republic of China *E-mails: zhengyuanchuan@gmail.com; lsa@cugb.edu.cn Search for other works by this author on: GSW Google Scholar Chang-Da Wu; Chang-Da Wu 1State Key Laboratory of Geological Processes and Mineral Resources, and School of Earth Science and Resources, China University of Geosciences, Beijing 100083, People's Republic of China Search for other works by this author on: GSW Google Scholar William L. Griffin; William L. Griffin 2ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS)–GEMOC, Macquarie University, Sydney, New South Wales 2109, Australia Search for other works by this author on: GSW Google Scholar Zhen-Qing Li; Zhen-Qing Li 3Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, People's Republic of China Search for other works by this author on: GSW Google Scholar Bo Xu; Bo Xu 1State Key Laboratory of Geological Processes and Mineral Resources, and School of Earth Science and Resources, China University of Geosciences, Beijing 100083, People's Republic of China2ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS)–GEMOC, Macquarie University, Sydney, New South Wales 2109, Australia Search for other works by this author on: GSW Google Scholar Zhi-Ming Yang; Zhi-Ming Yang 4Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, People's Republic of China Search for other works by this author on: GSW Google Scholar Zeng-Qian Hou; Zeng-Qian Hou 4Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, People's Republic of China Search for other works by this author on: GSW Google Scholar Suzanne Y. O'Reilly Suzanne Y. O'Reilly 2ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS)–GEMOC, Macquarie University, Sydney, New South Wales 2109, Australia Search for other works by this author on: GSW Google Scholar Author and Article Information Yuan-Chuan Zheng * 1State Key Laboratory of Geological Processes and Mineral Resources, and School of Earth Science and Resources, China University of Geosciences, Beijing 100083, People's Republic of China2ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS)–GEMOC, Macquarie University, Sydney, New South Wales 2109, Australia Sheng-Ao Liu * 1State Key Laboratory of Geological Processes and Mineral Resources, and School of Earth Science and Resources, China University of Geosciences, Beijing 100083, People's Republic of China Chang-Da Wu 1State Key Laboratory of Geological Processes and Mineral Resources, and School of Earth Science and Resources, China University of Geosciences, Beijing 100083, People's Republic of China William L. Griffin 2ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS)–GEMOC, Macquarie University, Sydney, New South Wales 2109, Australia Zhen-Qing Li 3Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, People's Republic of China Bo Xu 1State Key Laboratory of Geological Processes and Mineral Resources, and School of Earth Science and Resources, China University of Geosciences, Beijing 100083, People's Republic of China2ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS)–GEMOC, Macquarie University, Sydney, New South Wales 2109, Australia Zhi-Ming Yang 4Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, People's Republic of China Zeng-Qian Hou 4Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, People's Republic of China Suzanne Y. O'Reilly 2ARC Centre of Excellence for Core to Crust Fluid Systems (CCFS)–GEMOC, Macquarie University, Sydney, New South Wales 2109, Australia *E-mails: zhengyuanchuan@gmail.com; lsa@cugb.edu.cn Publisher: Geological Society of America Received: 09 Jul 2018 Revision Received: 21 Nov 2018 Accepted: 06 Dec 2018 First Online: 31 Dec 2018 Online Issn: 1943-2682 Print Issn: 0091-7613 © 2018 Geological Society of America Geology (2019) 47 (2): 135–138. https://doi.org/10.1130/G45362.1 Article history Received: 09 Jul 2018 Revision Received: 21 Nov 2018 Accepted: 06 Dec 2018 First Online: 31 Dec 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Yuan-Chuan Zheng, Sheng-Ao Liu, Chang-Da Wu, William L. Griffin, Zhen-Qing Li, Bo Xu, Zhi-Ming Yang, Zeng-Qian Hou, Suzanne Y. O'Reilly; Cu isotopes reveal initial Cu enrichment in sources of giant porphyry deposits in a collisional setting. Geology 2018;; 47 (2): 135–138. doi: https://doi.org/10.1130/G45362.1 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 Porphyry copper deposits (PCDs) represent the most important type of Cu reservoir on Earth, but the mechanism of Cu enrichment in PCDs is debated due to the lack of direct constraints. This issue may be resolved by the study of copper isotopes (δ65Cu), which are strongly fractionated during formation and/or precipitation of sulfides. Here we report high-precision Cu-isotope data on a large set of porphyries, mafic magmatic enclaves (MMEs), and sulfide ores from PCDs in southern Tibet. For comparison, barren intrusions from southern Tibet were also analyzed. The fertile porphyries and MMEs from PCDs have high Cu contents and elevated δ65Cu values compared with the barren intrusions and global average felsic rocks. These features are inconsistent with the known supergene processes after sulfide formation (e.g., leaching and weathering). Because sulfides formed from secondary Cu-rich fluids are enriched in heavy Cu isotopes, the elevated Cu contents and Cu-isotope ratios indicate that the Cu source for PCDs was a refertilized lithosphere enriched in sulfides. This suggests that initial Cu enrichment in magma sources could be a key step in the formation of giant PCDs in continental collision zones. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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