Hydrothermal Effects on Isotope and Trace Element Records in Modern Reef Corals: A Study of Porites lobata from Tutum Bay, Ambitle Island, Papua New Guinea

Other| June 01, 2000 Hydrothermal Effects on Isotope and Trace Element Records in Modern Reef Corals: A Study of Porites lobata from Tutum Bay, Ambitle Island, Papua New Guinea THOMAS PICHLER; THOMAS PICHLER 1Department of Geology, University of South Florida, 4202 E. Fowler Ave., Tampa, FL 33620 Search for other works by this author on: GSW Google Scholar JEFFREY M. HEIKOOP; JEFFREY M. HEIKOOP 2School of Geography and Geology, McMaster University, Hamilton, Ontario L8S 4M1, Canada also: EES-1, MS-D462, LANL, Los Alamos, NM 87545 Search for other works by this author on: GSW Google Scholar MICHAEL J. RISK; MICHAEL J. RISK 3School of Geography and Geology, McMaster University, Hamilton, Ontario L8S 4M1, Canada Search for other works by this author on: GSW Google Scholar JAN VEIZER; JAN VEIZER 4Ottawa-Carleton Geoscience Centre, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada also: Institut für Geologie, Ruhr Universität, 44780 Bochum, Germany Search for other works by this author on: GSW Google Scholar IAIN L. CAMPBELL IAIN L. CAMPBELL 5Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information THOMAS PICHLER 1Department of Geology, University of South Florida, 4202 E. Fowler Ave., Tampa, FL 33620 JEFFREY M. HEIKOOP also: EES-1, MS-D462, LANL, Los Alamos, NM 87545 2School of Geography and Geology, McMaster University, Hamilton, Ontario L8S 4M1, Canada MICHAEL J. RISK 3School of Geography and Geology, McMaster University, Hamilton, Ontario L8S 4M1, Canada JAN VEIZER also: Institut für Geologie, Ruhr Universität, 44780 Bochum, Germany 4Ottawa-Carleton Geoscience Centre, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada IAIN L. CAMPBELL 5Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada Publisher: SEPM Society for Sedimentary Geology Accepted: 02 Feb 2000 First Online: 03 Mar 2017 Online ISSN: 1938-5323 Print ISSN: 0883-1351 Society for Sedimentary Geology PALAIOS (2000) 15 (3): 225–234. https://doi.org/10.1669/0883-1351(2000)015<0225:HEOIAT>2.0.CO;2 Article history Accepted: 02 Feb 2000 First Online: 03 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation THOMAS PICHLER, JEFFREY M. HEIKOOP, MICHAEL J. RISK, JAN VEIZER, IAIN L. CAMPBELL; Hydrothermal Effects on Isotope and Trace Element Records in Modern Reef Corals: A Study of Porites lobata from Tutum Bay, Ambitle Island, Papua New Guinea. PALAIOS 2000;; 15 (3): 225–234. doi: https://doi.org/10.1669/0883-1351(2000)015<0225:HEOIAT>2.0.CO;2 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 SocietyPALAIOS Search Advanced Search Abstract The coral reef in Tutum Bay, Ambitle Island, Papua New Guinea, is exposed to the vigorous discharge of hydrothermal fluids (up to 98°C). This study investigates eight Porites lobata samples that were collected throughout the area of active venting at varying distances from vent sites. A sample from a "non-hydrothermal" coral (C-29), collected 10 km north of Tutum Bay, was analyzed for comparative purposes.Density banding is moderately well developed in these corals and subannual bands are common. For corals from Tutum Bay, δ13C ranges from −4.5 to −1.0‰ and δ18O from −6.0 to −3.8‰, which are relatively depleted values for shallow water Porites. The comparison sample, C-29, has δ13C values ranging from −1.8 to −0.5‰, and δ18O values of −5.4 to −4.6‰. Concentrations of As, Co, Cr, Ga, Ge, Mo, Nb, Ni, Pb, Rb, Se, W, Y and Zr were always below their respective proton probe detection limits. Ba, Br, Cu, Fe, Mn, and Zn were detected in some samples. Sr was detected in all samples and concentrations ranged from 6970 to 8240 ppm. Strontium isotope ratios of selected samples (C-5, C-8 and C-29) are very close to seawater, but Tutum Bay corals (C-5 and C-8) have lower 87Sr/86Sr values than the "non-hydrothermal" sample (C-29).The observed isotope patterns indicate that the hydrothermal input into Tutum Bay influences the physico-chemical conditions in the surrounding coral reef. Tutum Bay Porites lobata show distinctly different δ13C and 87Sr/86Sr records when compared to the "non-hydrothermal" sample and other corals from Papua New Guinea and elsewhere. Direct and indirect synergistic effects, including temperature, isotopic and chemical composition of vent fluids and the influence of pCO2 on the expression of photosynthetic and kinetic stable isotope fractionation factors, are the most likely explanation for the "hydrothermal" signal seen in these corals. The δ18O values are significantly correlated with the estimated amounts of hydrothermal exposure. 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