The SuSu Knolls Hydrothermal Field, Eastern Manus Basin, Papua New Guinea: An Active Submarine High-Sulfidation Copper-Gold System
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Research Article| December 01, 2014 The SuSu Knolls Hydrothermal Field, Eastern Manus Basin, Papua New Guinea: An Active Submarine High-Sulfidation Copper-Gold System Christopher J. Yeats; Christopher J. Yeats † 1CSIRO Division of Earth Science and Resource Engineering, P.O. Box 1130, Bentley, Western Australia, Australia 6102 †Corresponding author: e-mail, christoper.yeats@gmail.com Search for other works by this author on: GSW Google Scholar Joanna M. Parr; Joanna M. Parr 2CSIRO Division of Earth Science and Resource Engineering, P.O. Box 136, North Ryde, New South Wales, Australia 1670 Search for other works by this author on: GSW Google Scholar Raymond A. Binns; Raymond A. Binns 2CSIRO Division of Earth Science and Resource Engineering, P.O. Box 136, North Ryde, New South Wales, Australia 16703Research School of Earth Sciences, Australian National University, Canberra ACT 0200 Australia Search for other works by this author on: GSW Google Scholar J. Bruce Gemmell; J. Bruce Gemmell 4ARC Centre of Excellence in Ore Deposits (CODES),University of Tasmania, Hobart, Tasmania, Australia 7001 Search for other works by this author on: GSW Google Scholar Steven D. Scott Steven D. Scott 5Marine Geology Research Laboratory, Department of Earth Sciences, University of Toronto, Toronto, Ontario, Canada M5S 3B1 Search for other works by this author on: GSW Google Scholar Author and Article Information Christopher J. Yeats † 1CSIRO Division of Earth Science and Resource Engineering, P.O. Box 1130, Bentley, Western Australia, Australia 6102 Joanna M. Parr 2CSIRO Division of Earth Science and Resource Engineering, P.O. Box 136, North Ryde, New South Wales, Australia 1670 Raymond A. Binns 2CSIRO Division of Earth Science and Resource Engineering, P.O. Box 136, North Ryde, New South Wales, Australia 16703Research School of Earth Sciences, Australian National University, Canberra ACT 0200 Australia J. Bruce Gemmell 4ARC Centre of Excellence in Ore Deposits (CODES),University of Tasmania, Hobart, Tasmania, Australia 7001 Steven D. Scott 5Marine Geology Research Laboratory, Department of Earth Sciences, University of Toronto, Toronto, Ontario, Canada M5S 3B1 †Corresponding author: e-mail, christoper.yeats@gmail.com Publisher: Society of Economic Geologists First Online: 09 Mar 2017 Online ISSN: 1554-0774 Print ISSN: 0361-0128 © 2014 Society of Economic Geologists. Economic Geology (2014) 109 (8): 2207–2226. https://doi.org/10.2113/econgeo.109.8.2207 Article history 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 Christopher J. Yeats, Joanna M. Parr, Raymond A. Binns, J. Bruce Gemmell, Steven D. Scott; The SuSu Knolls Hydrothermal Field, Eastern Manus Basin, Papua New Guinea: An Active Submarine High-Sulfidation Copper-Gold System. Economic Geology 2014;; 109 (8): 2207–2226. doi: https://doi.org/10.2113/econgeo.109.8.2207 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 SuSu Knolls comprises three steep-sided conical volcanic peaks, standing on a N-NW-trending ridge in the eastern Manus basin, a complex zone of convergence between the major Indo-Australian and Pacific plates. The knolls consist of three porphyritic andesite-to-dacite domes, each 1.0 to 1.5 km in diameter, with crests ranging from 1,150 to 1,520 m below sea level. An intense hydrothermal plume, with peak transmission anomalies in excess of 40%, originates from SuSu Knolls, and associated hydrothermal venting, with fluid temperatures exceeding 300°C and sulfide mineralization, has been detected on the crests of all three edifices. The most important of these is the 2.47 million metric ton (Mt) Solwara 1 copper-gold deposit on Suzette Knoll, slated for mining by Nautilus Minerals. The porphyritic dacite is commonly strongly altered by reaction with acidic fluids. Fragments of sulfide mineralization, collected as part of the seafloor talus surrounding the crest of North Su and South Su, are characterized by an assemblage of pyrite-(fukuchilite)-enargite ± covellite-chalcopyrite. By contrast, there are actively venting chimneys on the crest of Suzette that are typically zoned, with chalcopyrite-pyrite-tennantite inner zones and barite-dominated outer zones. The knolls are covered by black sulfidic sediments that contain up to 2.4 wt % Cu and 3.2 ppm Au.Primary feldspars have been obliterated by the hydrothermal activity that ranges from incipient to intense and which is characterized by natroalunite, alunite (North Su only), cristobalite, tridymite, and rare quartz and kaolinite. Most volcanic rocks exhibit a patchy surficial coating of native sulfur, which may also fill vesicles. No altered rocks were dredged from Suzette because of the thick sulfidic sediment cover. Mass-balance calculations for altered and unaltered rock from North and South Su show that major and trace lithophile elements are depleted in the altered rocks, except for Ti, Al, Si, and Zr (all near-immobile), in concert with the destruction of the primary minerals and removal of primary components by acidic fluids. Sulfur and chalcophile trace elements (i.e., As, Au, Ba, Cd, Cu, Mo, Pb, and Se), typically associated with magmatic Cu-Au mineralization, are enriched by orders-of-magnitude in both leached and mineralized rock. Sulfide and native sulfur δ34S values from all three domes range from −7.4 to +0.4‰, indicating a magmatic component for the sulfur. A small group of ore elements (i.e., Ag, Bi, In, Sb, and Zn) are strongly enriched in mineralized breccias and depleted in the altered dacites, suggesting redistribution during alteration.The presence of advanced argillic alteration, the paragenesis of the Fe-Cu-As sulfide assemblage and presence of native sulfur, together with the sulfur isotope evidence for magmatic input into the hydrothermal fluid at SuSu Knolls, are consistent with a submarine high sulfidation magmatic Cu-Au hydrothermal system. Furthermore, the sulfide assemblage pyrite-enargite (±covellite-chalcopyrite) observed at North and South Su, and orders-of-magnitude enrichment of chalcophile elements in both altered and mineralized volcanic rocks, relative to unaltered volcanic rock, are also characteristic of subaerial high sulfidation epithermal mineralization. The SuSu Knolls hydrothermal field is a good example of a modern, high sulfidation, Cu-Au submarine hydrothermal system. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.Keywords:
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