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Shallow Drilling of Seafloor Hydrothermal Systems Using the BGS Rockdrill: Conical Seamount (New Ireland Fore-Arc) and PACMANUS (Eastern Manus Basin), Papua New Guinea

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Petersen, S and Herzig, PM and Kuhn, T and Franz, L and Hannington, MD and Monecke, T and Gemmell, JB (2005) Shallow Drilling of Seafloor Hydrothermal Systems Using the BGS Rockdrill: Conical Seamount (New Ireland Fore-Arc) and PACMANUS (Eastern Manus Basin), Papua New Guinea. Marine Georesources and Geotechnology,, 23 (3). pp. 175-193. ISSN 1064-119X

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Abstract

From September to October 2002, shallow drilling, using the submersible (5 m) Rockdrill of the British Geological Survey and the German R=V Sonne revealed critical information on the subsurface nature of two distinct hydrothermal systems in the New Ireland fore-arc and the Manus Basin of Papua New Guinea. Drilling at Conical Seamount significantly extends the known surface extent of the previously discovered vein-style gold mineralization (up to 230 g=t Au) at this site. Drilling the conventional PACMANUS volcanic-hosted massive sulfide deposit recovered complexly textured massive sulfide with spectacular concentrations of gold in several core sections including 0.5m@28 g=t Au, 0.35m@30 g=t Au, and 0.20m@57 g=t Au. Shallow drilling is a fast and cost efficient method that bridges the gap between surface sampling and deep (ODP) drilling and will become a standard practice in the future study of seafloor hydrothermal systems and massive sulfide deposits.

Item Type: Article
Keywords: Seafloor massive sulfides, shallow drilling, conical seamount, PACMANUS, gold, black smoker chimneys, Lihir Island, alteration, polymetallic mineralisation, major and trace elements
Journal or Publication Title: Marine Georesources and Geotechnology,
Page Range: pp. 175-193
ISSN: 1064-119X
Identification Number - DOI: 10.1080/10641190500192185
Date Deposited: 12 Jul 2007
Last Modified: 18 Nov 2014 03:19
URI: http://eprints.utas.edu.au/id/eprint/1354
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