Miller, D. Jay (2007): Sulfide mineralization at Site 1268, Mid-Atlantic Ridge, Ocean Drilling Program Leg 209. Texas A&M University, Ocean Drilling Program, College Station, TX, United States, In: 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 2003, 209, georefid:2007-087745

Abstract:
This 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.
Coverage:
West: -45.0500 East: -45.0500 North: 14.5100 South: 14.5100
Relations:
Expedition: 209
Site: 209-1268
Data access:
Provider: SEDIS Publication Catalogue
Data set link: http://sedis.iodp.org/pub-catalogue/index.php?id=10.2973/odp.proc.sr.209.004.2007 (c.f. for more detailed metadata)
Data download: application/pdf
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