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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| Authors: | Sven Petersen Peter M Herzig Thomas Kuhn Leander Franz Mark D Hannington Thomas Monecke |
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| Institution: | 1. Leibniz-Institute of Marine Sciences, IFM-GEOMAR , Kiel, Germany spetersen@ifm-geomar.de;3. Leibniz-Institute of Marine Sciences, IFM-GEOMAR , Kiel, Germany;4. Leibniz-Laboratory of Applied Marine Research, Institute of Mineralogy, Freiberg University of Mining and Technology , Freiberg, Germany;5. Department of Earth Sciences , Ottawa, Canada |
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| Abstract: | 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 0.5 m @ 28 g/t Au, 0.35 m @ 30 g/t Au, and 0.20 m @ 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. |
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| Keywords: | Seafloor massive sulfides shallow drilling conical seamount PACMANUS gold |
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