georefid:2007-087745georefid:2007-087742SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.2973/odp.proc.sr.209.004.20072007-01-01publicationgeorefid:2007-087745doi:10.2973/odp.proc.sr.209.004.2007Miller, D. JayTexas A&M University, Integrated Ocean Drilling Program, College Station, TX, United StatesauthorTexas A&M University, Ocean Drilling Program, College Station, TX, United StatespublisherdocumentDigitalIn: Kikawa, Eiichi, Kelemen, Peter B., Miller, D. Jay, Abe, Natsue, Bach, Wolfgang, Carlson, Richard L., Casey, John F., Chambers, Lynne M., Cheadle, Michael, Cipriani, Anna, Dick, Henry J. B., Faul, Ulrich, Garces, Miguel, Garrido, Carlos J., Gee, Jeffrey S., Godard, Marguerite M., Graham, David W., Griffin, Dale W., Harvey, Jason, Ildefonse, Benoit, Iturrino, Gerardo J., Josef, Jennifer A., Meurer, William P., Paulick, Holger, Rosner, Martin, Schroeder, Timothy, Seyler, Monique, Takazawa, Eiichi, Proceedings of the Ocean Drilling Program; scientific results; drilling mantle peridotite along the Mid-Atlantic Ridge from 14 degrees to 16 degrees N; covering Leg 209 of the cruises of the drilling vessel JOIDES Resolution; Rio de Janeiro, Brazil, to St. George, Bermuda; Sites 1268-1275; 6 May-6 July 2003209This paper presents sulfide mineral occurrence, abundance, and composition in samples from hydrothermally altered peridotite and gabbro recovered during Ocean Drilling Program (ODP) Leg 209 from south of the 15 degrees 20'N Fracture Zone on the Mid-Atlantic Ridge at Site 1268. Most of the sulfide minerals occur in veins and halos around veins in serpentinized peridotite. The only sulfide phases reported that occur in proximity to gabbro are those associated with a mafic intrusion into serpentinized peridotite. Sulfide mineral species change predictably downsection but are perturbed coincident with a breccia interpreted to be generated by intrusion of a gabbroic magma. The general downhole trend suggests sulfide mineral precipitation in conditions with decreasing sulfur and oxygen fugacity. Sulfide minerals that indicate precipitation at relatively higher sulfur and oxygen fugacity occur in the central core of the intrusion breccia. Sphalerite makes a fleeting appearance in the sulfide mineral assemblage in samples from the lower part of the intrusion breccia. Strongly contrasting pyrite compositions suggest at least two episodes of pyrite precipitation, but there is no clear morphological distinction between phases. Heazelwoodite, tentatively identified in shipboard examinations, could not be confirmed in this study.completedIgneous and metamorphic petrologyAtlantic Oceanboreholescoresgabbroshydrothermal alterationigneous rocksLeg 209metasomatismMid-Atlantic Ridgemineral assemblagesmineral compositionmineralizationNorth AtlanticOcean Drilling ProgramODP Site 1268peridotitesplutonic rockssulfidesthin sectionsultramaficsurn:org.iodp:exp:209urnlargerWorkCitationcampaignurn:org.iodp:exp:209:site:1268urnlargerWorkCitationstudyurn:org.iodp:exp:209urnlargerWorkCitationcampaignEnglishgeoscientificInformation-45.0500-45.050014.510014.5100application/pdfunknownSEDIS Publication Catalogue

ana.macario@awi.de

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