Moore, J. C. et al. (1995): Abnormal fluid pressures and fault-zone dilation in the Barbados accretionary prism; evidence from logging while drilling

Leg/Site/Hole: Related Expeditions:

ODP 110
ODP 156
ODP 110 671
ODP 156 948

Identifier: ID:

1995-048949

Type:

georefid

ID:

10.1130/0091-7613(1995)023<0605:AFPAFZ>2.3.CO;2

Type:

doi

Creator: Name:

Moore, J. C.

Affiliation:

University of California at Santa Cruz, Earth Sciences, Santa Cruz, CA, United States

Role:

author

Name:

Shipley, T. H.

Affiliation:

University of Texas at Austin, United States

Role:

author

Name:

Goldberg, D.

Affiliation:

Lamont-Doherty Earth Observatory, United States

Role:

author

Name:

Ogawa, Y.

Affiliation:

University of Tsukuba, Japan

Role:

author

Name:

Filice, F.

Affiliation:

Indiana University, United States

Role:

author

Name:

Fisher, A.

Affiliation:

Institute of Earth Sciences, Barcelona, Spain

Role:

author

Name:

Jurado, M. J.

Affiliation:

University of Hawaii at Honolulu, United States

Role:

author

Name:

Moore, G. F.

Affiliation:

University of Montpellier II, France

Role:

author

Name:

Rabaute, A.

Affiliation:

Research Center for Marine Geosciences, Kiel, Federal Republic of Germany

Role:

author

Name:

Yin, H.

Affiliation:

Ecole Normale Superieure de Paris, France

Role:

author

Name:

Zwart, G.

Affiliation:

University of Tokyo, Japan

Role:

author

Name:

Brueckmann, W.

Affiliation:

Ocean Drilling Program, United States

Role:

author

Name:

Henry, P.

Affiliation:

Woods Hole Oceanographic Institution, United States

Role:

author

Name:

Ashi, J.

Affiliation:

University of Minnesota at Minneapolis, United States

Role:

author

Name:

Blum, P.

Affiliation:

Scripps Institution of Oceanography, United States

Role:

author

Name:

Meyer, A.

Affiliation:

Geological Survey of Denmark, Denmark

Role:

author

Name:

Housen, B.

Affiliation:

Sydney University of Technology, Australia

Role:

author

Name:

Kastner, M.

Affiliation:

University of Wales at Aberystwyth, United Kingdom

Role:

author

Name:

Labaume, P.

Affiliation:

University of Birmingham, United Kingdom

Role:

author

Name:

Laier, T.

Affiliation:

Institute for Paleontology and History of Geology, Munich, Federal Republic of Germany

Role:

author

Name:

Leitch, E. C.

Affiliation:

University of California at Santa Cruz, United States

Role:

author

Name:

Maltman, A. J.

Affiliation:

University of Missouri at Columbia, United States

Role:

author

Name:

Peacock, S.

Affiliation:

Florida State University, United States

Role:

author

Name:

Steiger, T. H.

Affiliation:

Role:

author

Name:

Tobin, H. J.

Affiliation:

Role:

author

Name:

Underwood, M. B.

Affiliation:

Role:

author

Name:

Xu, Y.

Affiliation:

Role:

author

Name:

Zheng, Y.

Affiliation:

Role:

author

Identification: Title:

Abnormal fluid pressures and fault-zone dilation in the Barbados accretionary prism; evidence from logging while drilling

Year:

1995

Source:

Geology (Boulder)

Publisher:

Geological Society of America (GSA), Boulder, CO, United States

Volume:

Issue:

Pages:

605-608

Abstract:

Logs collected while drilling measured density in situ, through the accretionary prism and decollement zone of the northern Barbados Ridge. Consolidation tests relate void ratio (derived from density) to effective stress and predict a fluid pressure profile, assuming that the upper 100 m of the prism is at a hydrostatic pressure gradient. The calculated fluid pressure curve rises to >90% of lithostatic below thrusts in the prism, presumably due to the increase in overburden and lateral tectonic loading. Thin (0.5-2.0 m) intervals of anomalously low density and resistivity in the logs through the basal decollement zone suggest dilation and perhaps hydrofracturing. A peak in hydraulic head in the upper half of the decollement zone requires lateral influx of fluid, a conclusion consistent with previous geochemical studies. Although the calculated fluid-pressure profile is model dependent, its inherent character ties to major structural features.

Language:

English

Genre:

Serial

Rights:

URL:

Coverage:Geographic coordinates:

	North:15.3133
West:-58.4357		East: -58.4357
	South:15.3133

Keywords:

Oceanography; Solid-earth geophysics; Applied geophysics; accretionary wedges; Atlantic Ocean; Barbados Ridge; consolidation; decollement; density; diagenesis; dilation; drilling; fault zones; faults; fluid pressure; geopressure; Leg 110; Leg 156; marine sediments; North Atlantic; Ocean Drilling Program; ODP Site 671; ODP Site 948; porosity; sediments; testing; well logs; well-logging;

SEDIS - Publications

Moore, J. C. et al. (1995): Abnormal fluid pressures and fault-zone dilation in the Barbados accretionary prism; evidence from logging while drilling