Kerneklian, Marcie J.; Jarrard, Richard D. (2007): Data report; Visible and near-infrared spectroscopy as an indicator of hydration in the upper oceanic crust of ODP Site 1256. Texas A&M University, Ocean Drilling Program, College Station, TX, United States, In: 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 2003, 206, georefid:2007-124235

Abstract:
For 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.
Coverage:
West: -91.5600 East: -91.5600 North: 6.4400 South: 6.4400
Relations:
Expedition: 206
Site: 206-1256
Data access:
Provider: SEDIS Publication Catalogue
Data set link: http://sedis.iodp.org/pub-catalogue/index.php?id=10.2973/odp.proc.sr.206.012.2007 (c.f. for more detailed metadata)
Data download: application/pdf
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