Portal de Periódicos da CAPES

Geology and Geochronology of the Golpu Porphyry and Wafi Epithermal Deposit, Morobe Province, Papua New Guinea

2018; Volume: 113; Issue: 1 Linguagem: Inglês

10.5382/econgeo.2018.4551

1554-0774

Marc L. Rinne, David R. Cooke, Anthony C. Harris, David Finn, Charlotte M. Allen, Matthew T. Heizler, Robert A. Creaser,

Geochemistry and Geologic Mapping

Research Article| January 01, 2018 Geology and Geochronology of the Golpu Porphyry and Wafi Epithermal Deposit, Morobe Province, Papua New Guinea Marc L. Rinne; Marc L. Rinne 1 ARC Centre of Excellence in Ore Deposits (CODES), University of Tasmania, Hobart, Tasmania 7001, Australia † Corresponding author: e-mail, rinne.marc@gmail.com Search for other works by this author on: GSW Google Scholar David R. Cooke; David R. Cooke 1 ARC Centre of Excellence in Ore Deposits (CODES), University of Tasmania, Hobart, Tasmania 7001, Australia2 Transforming the Mining Value Chain, an ARC Industrial Transformation Research Hub, University of Tasmania, Hobart, Tasmania 7001, Australia Search for other works by this author on: GSW Google Scholar Anthony C. Harris; Anthony C. Harris 3 Newcrest Mining Ltd., Level 8, 600 St. Kilda Road, Melbourne, Victoria 3004, Australia Search for other works by this author on: GSW Google Scholar David J. Finn; David J. Finn 3 Newcrest Mining Ltd., Level 8, 600 St. Kilda Road, Melbourne, Victoria 3004, Australia Search for other works by this author on: GSW Google Scholar Charlotte M. Allen; Charlotte M. Allen 4 Institute for Future Environments and Department of Earth, Environmental and Biological Sciences, Queensland University of Technology, Brisbane, Queensland 4000, Australia Search for other works by this author on: GSW Google Scholar Matthew T. Heizler; Matthew T. Heizler 5 New Mexico Bureau of Geology and Mineral Resources, New Mexico Institute of Mining and Technology, Socorro, New Mexico 87801-4796 Search for other works by this author on: GSW Google Scholar Robert A. Creaser Robert A. Creaser 6 Department of Earth and Atmospheric Sciences, University of Alberta, 126ESB, Edmonton, Alberta T6G 2R3, Canada Search for other works by this author on: GSW Google Scholar Economic Geology (2018) 113 (1): 271–294. https://doi.org/10.5382/econgeo.2018.4551 Article history first online: 27 Feb 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Marc L. Rinne, David R. Cooke, Anthony C. Harris, David J. Finn, Charlotte M. Allen, Matthew T. Heizler, Robert A. Creaser; Geology and Geochronology of the Golpu Porphyry and Wafi Epithermal Deposit, Morobe Province, Papua New Guinea. Economic Geology 2018;; 113 (1): 271–294. doi: https://doi.org/10.5382/econgeo.2018.4551 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 SocietyEconomic Geology Search Advanced Search Abstract The Wafi-Golpu district of Papua New Guinea contains contrasting high- and intermediate-sulfidation styles of epithermal veins and alteration that have overprinted and partially obscured the giant, high-grade Golpu porphyry Cu-Au deposit. The initial stages of magmatic-hydrothermal activity produced high-grade porphyry-style assemblages that are zoned about the Golpu diorite intrusions, with most mineralization formed between 8.76 ± 0.02 and 8.73 ± 0.01 Ma. Porphyry mineralization was followed by the eruption of the Wafi diatreme, after which upward-widening zones of epithermal alteration and mineralization have overprinted both the mineralized Golpu diorites and the Wafi diatreme. Above the top of the Golpu porphyry, vein and alteration assemblages include quartz (locally vuggy), alunite, pyrophyllite, kaolinite, dickite, and diaspore, with high-sulfidation mineralization consisting of pyrite-covellite-chalcocite-tennantite ± enargite ± bornite that transitions outward to a distal assemblage of disseminated pyrite-sphalerite ± tennantite. A zone of intermediate-sulfidation epithermal carbonate-sulfide ± quartz ± adularia veins and montmorillonite-chlorite ± muscovite ± illite alteration occurs along the margins of the high-sulfidation domain. Most of the epithermal Au occurs near the transition from the high- to intermediate-sulfidation domains. New geochronological results indicate that the main stage of Golpu porphyry mineralization to the last stage of Wafi epithermal veins lasted between 120 and 220 k.y. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.