georefid:2006-066608georefid:2006-066600SEDIS 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.195.108.20052006-01-01publicationgeorefid:2006-066608doi:10.2973/odp.proc.sr.195.108.2005D'Antonio, MassimoUniversita degli Studi di Napoli "Federico II", Dipartimento di Scienze della Terra, Naples, ItalyauthorKristensen, Mette B.Geological Survey of Canada, CanadaauthorTexas A&M University, Ocean Drilling Program, College Station, TX, United StatespublisherdocumentDigitalIn: Shinohara, Masanao (editor), Salisbury, Matthew H. (editor), Richter, Carl (editor), Araki, Eiichiro, Barr, Samantha R., D'Antonio, Massimo, Dean, Simon M., Diekmann, Bernhard, Edwards, K. Michelle, Fryer, Patricia B., Gaillot, Philippe J., Hammon, William S., III, Hart, David, Januszczak, Nicole, Komor, Stephen C., Kristensen, Mette B., Lockwood, John P., Mottl, Michael J., Moyer, Craig L., Nakahigashi, Kazuo, Savov, Ivan P., Su Xin, Wei, Kuo-Yen, Yamada, Tomoaki, Proceedings of the Ocean Drilling Program; scientific results; seafloor observatories and the Kuroshio Current; covering Leg 195 of the cruises of the drilling vessel JOIDES Resolution; Apra Harbor, Guam, to Keelung, Taiwan; Sites 1200-1202; 2 March-2 May 2001195The basement cored at Site 1201 (west Philippine Basin) during Ocean Drilling Program Leg 195 consists of a 91-m-thick sequence of basalts, mostly pillow lavas and perhaps one sheet lava flow, with a few intercalations of hyaloclastite and interpillow sedimentary material. Hydrothermal alteration pervasively affected the basalt sequence, giving rise to a variety of secondary minerals such as K-Fe-Mg-clay minerals, oxyhydroxides and clay minerals mixtures, natrolite group zeolites, analcite, alkali feldspar, and carbonate. The primary minerals of pillow and sheet basalts that survived the intense hydrothermal alteration were investigated by electron microprobe with the aim of characterizing their chemical composition and variability. The primary minerals are mostly plagioclase, ranging in composition from bytownite through labradorite to andesine, chromian-magnesian-diopside, and spinels, both Ti magnetite (partially maghemitized) and chromian spinel. Overall, the chemical features of the primary minerals of Site 1201 basalts correspond to the primitive character of the bulk rocks, suggesting that the parent magma of these basalts was a mafic tholeiitic magma that most likely only suffered limited fractional crystallization and crystallized at high temperatures (slightly below 1200 degrees C) and under increasing fO (sub 2) conditions. The major element composition of clinopyroxene suggests a backarc affinity of the mantle source of Site 1201 basement.completedIgneous and metamorphic petrologyGeochemistry of rocks, soils, and sedimentsbasaltschemical compositionconcentrationelectron probe datageochemistryhydrothermal alterationigneous rockslava flowsLeg 195metasomatismmineral compositionNorth PacificNorthwest PacificOcean Drilling ProgramODP Site 1201Pacific OceanPhilippine Seavolcanic rocksWest PacificWest Philippine Basinurn:org.iodp:exp:195urnlargerWorkCitationcampaignurn:org.iodp:exp:195:site:1201urnlargerWorkCitationstudyurn:org.iodp:exp:195urnlargerWorkCitationcampaignEnglishgeoscientificInformation135.0500135.060019.170019.1800Data report; available only on CD-ROM in PDF format and on the Web in PDF or HTMLapplication/pdfunknownSEDIS Publication Catalogue

ana.macario@awi.de

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