georefid:2007-051485georefid:2007-051482SEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.2973/odp.proc.sr.193.203.2004<gco:CharacterString>Sulfide and oxide mineral chemistry of an active backarc hydrothermal system; PACMANUS, ODP Holes 1188A, 1188F, 1189A, and 1189B</gco:CharacterString>2007-01-01publicationgeorefid:2007-051485doi:10.2973/odp.proc.sr.193.203.2004Pinto, Alvaro M. M.Universidade de Lisboa, Faculdade de Ciencias, Lisbon, PortugalauthorBarriga, Fernando J. A. S.CSIRO, AustraliaauthorScott, Steven D.Ocean Drilling Program, United StatesauthorTexas A&M University, Ocean Drilling Program, College Station, TX, United StatespublisherdocumentDigitalIn: Barriga, Fernando J. A. S., Binns, Raymond A., Miller, D. Jay, Asada, Ryuji, Bach, Wolfgang, Bartetzko, Anne C. M., Benning, Liane G., Bjerkgard, Terje, Christiansen, Lizet B., Elswick, Erika R., Findlay, Robert, Iturrino, Gerardo J., Kimura, Hiroyuki, Kulange, John B., Lackschewitz, Klas S., Lee, Sang-Mook, Masta, Andrew, Paulick, Holger, Pinto, Alvaro M., Roberts, Stephen, Scott, Steven D., Vanko, David A., Warden, Ian, Yeats, Christopher J., Proceedings of the Ocean Drilling Program; scientific results; anatomy of an active felsic-hosted hydrothermal system, eastern Manus Basin; covering Leg 193 of the cruises of the drilling vessel JOIDES Resolution; Apra Harbor, Guam, to Townsville, Australia; Sites 1188-1191; 7 November 2000-3 January 2001193Ocean Drilling Program (ODP) Leg 193 recovered core from the active PACMANUS hydrothermal field (eastern Manus Basin, Papua New Guinea) that provided an excellent opportunity to study mineralization related to a seafloor hydrothermal system hosted by felsic volcanic rocks. The purpose of this work is to provide a data set of mineral chemistry of the sulfide-oxide mineralization and associated gold occurrence in samples drilled at Sites 1188 and 1189. PACMANUS consists of five active vent sites, namely Rogers Ruins, Roman Ruins, Satanic Mills, Tsukushi, and Snowcap. In this work two sites were studied: Snowcap and Roman Ruins. Snowcap is situated in a water depth of 1670 meters below sea level [mbsl], covers a knoll of dacite-rhyodacite lava, and is characterized by low-temperature diffuse venting. Roman Ruin lies in a water depth of 1693-1710 mbsl, is 150 m across, and contains numerous large, active and inactive, columnar chimneys. Sulfide mineralogy at the Roman Ruins site is dominated by pyrite with lesser amounts of chalcopyrite, sphalerite, pyrrhotite, marcasite, and galena. Sulfide minerals are relatively rare at Snow Cap. These are dominated by pyrite with minor chalcopyrite and sphalerite and traces of pyrrhotite. Native gold has been found in a single sample from Hole 1189B (Roman Ruins). Oxide minerals are represented by Ti magnetite, magnetite, ilmenite, hercynite (Fe spinel), and less abundant Al-Mg rich chromite (average = 10.6 wt% Al (sub 2) O (sub 3) and 5.8 wt% MgO), Fe-Ti oxides, and a single occurrence of pyrophanite (MnTiO (sub 3) ). Oxide mineralization is more developed at Snowcap, whereas sulfide minerals are more extensive and show better development at Roman Ruins. The mineralogy was obtained mainly by a detailed optical microscopy study. Oxide mineral identifications were confirmed by X-ray diffraction, and mineral chemistry was determined by electron probe microanalyses.completedIgneous and metamorphic petrologyback-arc basinsbasinsBismarck Seacorescrystal chemistryfelsic compositionhydrothermal conditionshydrothermal ventsigneous rocksLeg 193Manus BasinOcean Drilling ProgramODP Site 1188ODP Site 1189oxidesPacific OceanPACMANUS hydrothermal fieldSouth PacificSouthwest Pacificsulfidesvolcanic rocksWest Pacificurn:org.iodp:exp:193urnlargerWorkCitationcampaignurn:org.iodp:exp:193:site:1188urnlargerWorkCitationstudyurn:org.iodp:exp:193urnlargerWorkCitationcampaignurn:org.iodp:exp:193:site:1189urnlargerWorkCitationstudyurn:org.iodp:exp:193urnlargerWorkCitationcampaignEnglishgeoscientificInformation151.4000151.4000-3.4400-3.4400Data report; available only on CD-ROM in PDF format and on the Web in PDF or HTMLapplication/pdfunknownSEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContacthttp://www-odp.tamu.edu/publications/193_SR/VOLUME/CHAPTERS/203.PDFdownload