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Abstract

AAPG Methods in Exploration No. 13, Chapter 14: Architecture of the Oceanic Basement: The Contribution of Wireline Logging, by P. K. Harvey, T. S. Brewer, D. Goldberg, S. Haggas, and G. Iturrino, Pages 199 - 211
from:
AAPG Methods in Exploration No. 13: Geological Applications of Well Logs, Edited by M. Lovell and N. Parkinson
Copyright © 2002 by The American Association of Petroleum Geologists. All rights reserved.

Chapter 14
Architecture of the Oceanic Basement: The Contribution of Wireline Logging

P. K. Harvey
T. S. Brewer
Department of Geology
University of Leicester, Leicester, U.K.

D. Goldberg
Borehole Research Group
Lamont-Doherty Earth Observatory
Columbia University
Palisades, New York, U.S.A.

S. Haggas
Department of Geology
University of Leicester, Leicester, U.K.

G. Iturrino
Borehole Research Group
Lamont-Doherty Earth Observatory
Columbia University
Palisades, New York, U.S.A.

ABSTRACT

The structure and architecture of the oceanic crust, which underlies 70% of the earth's surface, are still virtually unknown. Slices of assumed oceanic crust obducted above sea level (ophiolites) provide a three-Previous HitlayerNext Hit model for the oceanic crust, comprising a volcanic sequence (seismic Layers 2A/2B) underlain by sheeted dikes (seismic Previous HitLayerNext Hit 2C) that are underlain by gabbros (seismic Previous HitLayerNext Hit 3). The last are considered to constitute the frozen magma chambers from which the overlying basaltic sequence was derived. Beneath Previous HitLayerTop 3, the model shows peridotites of the upper mantle, which represent the host from which the entire overlying sequence was derived by partial melting.

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