Borehole images of the ocean crust; case histories from the Ocean Drilling Program

Author(s): Brewer, T. S.; Harvey, P. K.; Haggas, S.; Pezard, P. A.; Goldberg, D.
Author Affiliation(s): Primary:
University of Leicester, Department of Geology, Leicester, United Kingdom
Gail Williamson Associates, United Kingdom
Lamont Doherty Earth Observatory, United States
Volume Title: Borehole imaging; applications and case histories
Volume Author(s): Lovell, Mike, editor; Williamson, Gail; Harvey, Peter
Source: Borehole imaging; applications and case histories, edited by Mike Lovell, Gail Williamson and Peter Harvey. Geological Society Special Publications, Vol.159, p.283-294. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0305-8719. ISBN: 1-86239-043-6
Note: In English. 35 refs.; illus., incl. 1 table, sketch maps
Summary: Downhole logging is an integral part of the Ocean Drilling Program (ODP), although the choice of tool deployment is primarily a function of the scientific objectives of an individual leg. Following the successful deployment of the Formation Microscanner (FMS) during Leg 126, FMS images have been used to constrain a variety of sedimentary, igneous, metamorphic and tectonic questions in the ocean. However, it is only recently, that the full potential of FMS images and other logging data has been employed in the study of volcanology, which provides important constraints on the evolution of the volcanic pile when fully integrated with core based measurements. Furthermore, many of the holes drilled into the volcanics often have incomplete core recovery and here the logging results can be used to constrain the lithological, chemical and mineralogical variations in such intervals. Using the log based stratigraphy from crust created at slow (Hole 395A) and intermediate (Holes 504B and 896A) spreading centres, it is evident that the proportions of volcanic rock types (pillows/flows/breccias) correlate with the spreading rate. This relationship is suggested from submersible observations, but the ODP data provide additional data to test such hypotheses and to also extended and test it within the third dimension.
Year of Publication: 1999
Research Program: DSDP Deep Sea Drilling Project
IPOD International Phase of Ocean Drilling
ODP Ocean Drilling Program
Key Words: 18 Geophysics, Solid-Earth; 20 Geophysics, Applied; Atlantic Ocean; Boreholes; Breccia; Caliper logging; Case studies; Clastic rocks; Cores; Crust; DSDP Site 395; DSDP Site 504; Deep Sea Drilling Project; East Pacific; Equatorial Pacific; Formation MicroScanner; Geochemical logging; Geophysical surveys; IPOD; Igneous rocks; Instruments; Lava; Leg 109; Leg 111; Leg 137; Leg 140; Leg 148; Leg 174B; Leg 45; Leg 69; Leg 70; Leg 78B; Leg 83; Leg 92; Lithosphere; Mid-Atlantic Ridge; ODP Site 896; Ocean Drilling Program; Oceanic crust; Pacific Ocean; Panama Basin; Pillow lava; Processes; Rates; Sea-floor spreading; Sedimentary rocks; Surveys; Three-dimensional models; Volcanic breccia; Volcanic rocks; Well-logging
Record ID: 2000013883
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute.

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