georefid:2007-124235SEDIS 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.206.012.2007<gco:CharacterString>Data report; Visible and near-infrared spectroscopy as an indicator of hydration in the upper oceanic crust of ODP Site 1256</gco:CharacterString>2007-01-01publicationgeorefid:2007-124235doi:10.2973/odp.proc.sr.206.012.2007Kerneklian, Marcie J.University of Utah, Department of Geology and Geophysics, Salt Lake City, UT, United StatesauthorJarrard, Richard D.University of California, Santa Barbara, United StatesauthorTexas A&M University, Ocean Drilling Program, College Station, TX, United StatespublisherdocumentDigitalIn: Teagle, Damon A. H., Wilson, Douglas S., Acton, Gary D., Alt, Jeffrey C., Banerjee, Neil R., Barr, Samantha R., Coggon, Rosalind, Cooper, Kari M., Crispini, Laura, Einaudi, Florence, Jiang, Shijun, Kalberkamp, Ulrich, Kerneklian, Marcie J., Laverne, Christine, Nichols, Holly J., Sandwell, Rachel, Tartarotti, Paola, Umino, Susumu, Ziegler, Christa, Proceedings of the Ocean Drilling Program; volume 206; scientific results; an in situ section of the upper oceanic crust formed by superfast seafloor spreading; covering Leg 206 of the cruises of the drilling vessel JOIDES Resolution; Balboa, Panama to Balboa, Panama; Site 1256; 6 November 2002-4 January 2003206For extrusive basalts of the upper oceanic crust, near-infrared radiation is reflected with a spectrum that is sensitive to the extent of crustal alteration. A published pilot study of basalts from Hole 801C showed that reflectance-based apparent alteration correlated with independent geophysical indicators of alteration (e.g., matrix density). This study shows that reflectance-based hydration correlates with geochemical measurements of structural water percentage and that air-dried archive half cores exhibit more reflectance-based hydration than do vacuumdried minicores. We calibrate the spectral response of visible and near-infrared spectroscopy (VNIS) with 907 measurements from seven basalt sites. The relationship between VNIS hydration estimates and geochemical measurements of structural water was determined, and a VNISbased estimate of relative smectite abundance was produced by factor analysis of three spectral characteristics. We used this calibration to estimate variations in hydration and smectite abundance throughout the 502-m section of upper oceanic crust at Ocean Drilling Program Site 1256, based on 2327 VNIS measurements on archive-half cores and 88 measurements on minicores.completedIgneous and metamorphic petrologyalterationatomic absorption spectrabasaltsboreholesclay mineralscorescrustEast PacificEast Pacific RiseEquatorial PacificGuatemala Basinhydrationigneous rocksLeg 206mineral compositionnear-infrared spectraNorth PacificNortheast PacificOcean Drilling Programoceanic crustODP Site 1256Pacific Oceansheet silicatessilicatessmectitespectraupper crustvolcanic rocksurn:org.iodp:exp:206urnlargerWorkCitationcampaignurn:org.iodp:exp:206:site:1256urnlargerWorkCitationstudyurn:org.iodp:exp:206urnlargerWorkCitationcampaignEnglishgeoscientificInformation-91.5600-91.56006.44006.4400application/pdfunknownSEDIS Publication Catalogueana.macario@awi.dehttp://sedis.iodp.org/pub-catalogue/informationpointOfContacthttp://www-odp.tamu.edu/publications/206_SR/VOLUME/CHAPTERS/012.PDFdownload