Abstract
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 ra...
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