Shallow Drilling of Seafloor Hydrothermal Systems Using the BGS Rockdrill: Conical Seamount (New Ireland Fore-Arc) and PACMANUS (Eastern Manus Basin), Papua New Guinea
| Autor: | Sven Petersen, Leander Franz, Thomas Kuhn, J. Bruce Gemmell, Mark D. Hannington, Thomas Monecke, Peter M. Herzig |
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| Rok vydání: | 2005 |
| Předmět: |
chemistry.chemical_classification
geography geography.geographical_feature_category Sulfide Seamount Geochemistry Drilling Mineralogy Ocean Engineering Structural basin Geotechnical Engineering and Engineering Geology Oceanography Hydrothermal circulation Seafloor spreading Mineral exploration chemistry Geological survey Geology |
| Zdroj: | Marine Georesources & Geotechnology. 23:175-193 |
| ISSN: | 1521-0618 1064-119X |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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