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Geological Society, London, Special Publications; 1990; v. 48; p. 195-202;
DOI: 10.1144/GSL.SP.1990.048.01.16
© 1990 Geological Society of London

Mineralogy and Geochemistry

Preliminary geochemical results from DSDP/ODP Hole 504B: a comparison of core and log data

T. S. Brewer1, M. A. Lovell1, P. K. Harvey1, R. Pelling1, B. P. Atkin1 & A. Adamson2

1 Geology Department, University of Nottingham, Nottingham NG7 2RD, UK
2 Ocean Drilling Program, Texas A&M University, College Station, TX 77840, USA

DSDP/ODP Hole 504B, located in the Eastern Equatorial Pacific in 5.9 Ma old crust, penetrates both basaltic pillows and dykes down to a depth of 1562.1 m below the sea floor. Core recovery is poor, averaging 230ut falling to a 12% average in the deepest sections. Geochemical logs give a continuous measure of elemental (Si, Ca, Fe, S, Ti, Gd, H, Cl, K, Th, U) abundances. Correlation between laboratory (XRF) geochemical data and log data is difficult because of the lack of accurate depth information for the cores. Pattern recognition techniques are of little help for locating sample depths in the uniform basaltic lithologies. Non-hierarchical clustering techniques prove the existence of relationships between core descriptions and gross geochemical variations; major lithostratigraphic zones are readily identified from the log-derived data.





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[Abstract] [PDF]