Milliken, Kitty L.; Lynch, F. L.; Seifert, Karl E. (1996): Marine weathering of serpentinites and serpentinite breccias, sites 897 and 899, Iberia abyssal plain. Texas A&M University, Ocean Drilling Program, College Station, TX, United States, In: Whitmarsh, Robert B., Sawyer, Dale S., Klaus, Adam, Beslier, Marie-Odile, Collins, Eric S., Comas, Maria Carmen, Cornen, Guy, de Kaenel, Eric, Pinheiro, Luis de Menezes, Gervais, Elisabeth, Gibson, Ian L., Harry, Dennis L., Hobart, Michael A., Kanamatsu, Toshiya, Krawcyzk, Charlotte M., Liu, Li, Lofts, Jeremy C., Marsaglia, Kathleen M., Meyers, Philip A., Milkert, Doris, Milliken, Kitty L., Morgan, Julia K., Ramirez, Pedro, Seifert, Karl E., Shaw, Timothy J., Wilson, Chris, Yin, Chuan, Zhao, Xixi, Proceedings of the Ocean Drilling Program; scientific results, Iberia abyssal plain; covering Leg 149 of the cruises of the Drilling Vessel JOIDES Resolution; Balboa Harbor, Panama, to Lisbon, Portugal; sites 897-901, 10 March-25 May 1993, 149, 529-540, georefid:2007-088112

Abstract:
Low-temperature aqueous alteration (weathering) of serpentinitic basement rocks at Sites 897 and 899 has produced dramatic textural and compositional modifications. Fe-oxyhydroxides, clay minerals, and calcium carbonate fill multiple generations of brittle fractures. Replacement of serpentinite minerals by smectite, carbonate, quartz, and possibly other clay minerals was accomplished through a complex sequence of repeated dissolution and precipitation. The youngest generation of brittle fractures is filled with particulate debris, including surviving fragments of serpentinite and fragments of all of the authigenic minerals. Enrichments of relatively immobile elements in altered samples (on a carbonate-free basis) suggest volume losses, relative to the initial serpentinitic material, in excess of 50% at Site 897 and 20% at Site 899. The magnitude of Mg loss (on a carbonate-free basis) roughly confirms these apparent volume changes but is difficult to assess given possible additions of oxidized iron to these samples.
Coverage:
West: -12.2847 East: -12.1604 North: 40.5019 South: 40.4622
Relations:
Expedition: 149
Site: 149-897
Site: 149-899
Data access:
Provider: SEDIS Publication Catalogue
Data set link: http://sedis.iodp.org/pub-catalogue/index.php?id=10.2973/odp.proc.sr.149.222.1996 (c.f. for more detailed metadata)
Data download: application/pdf
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