Haraguchi, Satoru; Ishii, Teruaki (2006): Petrological and geochemical features of igneous basement at Site 1224. Texas A&M University, Ocean Drilling Program, College Station, TX, United States, In: Kasahara, Junzo, Stephen, Ralph A., Acton, Gary D., Calhoun, R. Scott, Haraguchi, Satoru, Hoskins, Hartley, Kittredge, Steven, Lustrino, Michele, Manz, Werner, Nakamura, Mikako, Natland, James H., Nielsen, Ingun, Paul, Heather, Schumann-Kindel, Gabriela, Sherman, Sarah, Sun, Yue-Feng, Wilson, John, Proceedings of the Ocean Drilling Program; scientific results; drilling at the Hawaii-2 Observatory (H2O) and the Nuuanu Landslide; covering Leg 200 of the cruises of the drilling vessel JOIDES Resolution; Honolulu, Hawaii, to San Diego, California; Sites 1223 and 1224; 16 December 2001-27 January 2002, 200, georefid:2007-002117

During Ocean Drilling Program Leg 200, approximately 45 Ma igneous basement, was cored in the northeastern Pacific at Site 1224. The basement surface was inferred to be 28 meters below seafloor (mbsf). Basement lithology down to 170 mbsf is divided into three major units: Unit 1 = massive flow, Unit 2 = pillow breccia, and Unit 3 = intermixed pillows and thin flows. The bulk compositions of Site 1224 rocks have high abundances of the high-field strength elements (HFSE) Y, Zr, and Nb relative to normal and even enriched mid-ocean-ridge basalts. Chemical stratigraphic differences among the three units at this site are clear. Unit 3 rocks have the highest FeO/MgO ratio and HFSE concentration, and Unit 2 lavas have the lowest. Unit 2 lavas also have the highest Y/Zr ratios. Unit 1 is separated into lower and upper flow units based on differences in HFSE content. Clearly, there were significant differences in the petrogenetic processes that created these units. Compositional and lithologic differences among the basement units correlate with differences in physical properties among the units described by the Leg 200 Shipboard Scientific Party. Physical properties are therefore associated with petrological features.
West: -141.5900 East: -141.5900 North: 27.5300 South: 27.5300
Expedition: 200
Site: 200-1224
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Data report; available only on CD-ROM in PDF format and on the Web in PDF or HTML
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Provider: SEDIS Publication Catalogue
Data set link: http://sedis.iodp.org/pub-catalogue/index.php?id=10.2973/odp.proc.sr.200.002.2006 (c.f. for more detailed metadata)
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