Composition of altered oceanic crust at ODP Sites 801 and 1149

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doi: 10.1029/2002GC000435
Author(s): Kelley, Katherine A.; Plank, Terry; Ludden, John; Staudigel, Hubert
Author Affiliation(s): Primary:
Boston University, Department of Earth Sciences, Boston, MA, United States
Other:
CNRS, France
Scripps Institution of Oceanography, United States
Volume Title: Geochemistry, Geophysics, Geosystems - G<sup>3</sup>
Source: Geochemistry, Geophysics, Geosystems - G>3`, 4(6). Publisher: American Geophysical Union and The Geochemical Society, United States. ISSN: 1525-2027
Note: In English. 45 refs.; illus., incl. 9 tables, sketch map
Summary: We present a comprehensive major and trace element dataset establishing ODP Site 801 as a geochemical reference for altered oceanic crust. The composition of old crustal sequences like those at Sites 801 and 1149 are critical to developing models of crustal aging and seawater chemistry evolution and to understanding the fate of crust consumed at subduction zones. Our estimate of the bulk composition of oceanic crust at Site 801 comprises ICP-AES and ICP-MS analyses of 117 discrete samples, 14 mixed composites and 5 glasses from the upper 500 m of Jurassic Pacific crust. Comparing the 801 "super-composite" with glass reveals enrichment of U (5x), Li (2x), K2O (4x), Rb (9x), and Cs (7x), similar to DSDP Sites 417/418, but little to no enrichment in Ba or Pb. The data also demonstrate good (∼10%) agreement between U measured on discrete samples and natural gamma logs, suggesting logging data is a reliable means of establishing bulk geochemical characteristics of oceanic crust. Data reported here serve to link other geochemical and mineralogical measurements on Site 801 and 1149 samples. We also document Boston University sample preparation procedures and instrument parameters for ICP-MS and ICP-AES analyses, and provide comparisons with other laboratories and techniques. We present new techniques for basaltic glass analyses using the Boston University 213 nm Nd-YAG LA-ICP-MS system, and show the data agree well with both solution-ICP-MS (5-10%) and ion probe measurements (∼10%).
Year of Publication: 2003
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; Basalts; Chemical composition; Crust; Experimental studies; Glasses; ICP mass spectra; Igneous rocks; Laboratory studies; Laser ablation; Laser methods; Leg 185; Major elements; Mass spectra; Mid-ocean ridge basalts; ODP Site 1149; ODP Site 801; Ocean Drilling Program; Oceanic crust; Plate tectonics; Spectra; Subduction; Trace elements; Volcanic rocks; Well logs
Coordinates: N183831 N183835 E1562136 E1562134
N312030 N312030 E1432100 E1432100
Record ID: 2006057704
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