Rao, D. Gopala and Krishna, K. S. (2005): Compressional wave velocity and index properties of the gabbroic rocks drilled at Hole 1105A of the Atlantis Bank, Southwest Indian Ridge
Leg/Site/Hole:
Related Expeditions:
ODP 179
Identifier:
ID:
2006-060398
Type:
georefid
Creator:
Name:
Rao, D. Gopala
Affiliation:
Osmania University, Department of Geology, Hyderabad, India
Role:
author
Name:
Krishna, K. S.
Affiliation:
National Institute of Oceanography, India
Role:
author
Identification:
Title:
Compressional wave velocity and index properties of the gabbroic rocks drilled at Hole 1105A of the Atlantis Bank, Southwest Indian Ridge
Year:
2005
Source:
Journal of the Geological Society of India
Publisher:
Geological Society of India, Bangalore, India
Volume:
65
Issue:
5
Pages:
609-617
Abstract:
Compressional wave velocities (Vp) and index properties of 70 mini-gabbroic rock-core samples of 2.5 cm diameterX2.1 cm long from 157.1 m below seafloor in Hole 1105A of the Atlantis Bank, Southwest Indian Ridge, were measured in the laboratory. Comparison of the Vps and onboard lithostratigraphy revealed that the Vps of the gabbros and olivine gabbros are very close and have the values 6.74+ or -0.04 and 6.7+ or -0.07 km/s, respectively. Oxides and oxide olivine gabbros have markedly lower Vps (6.53+ or -0.076 and 6.59+ or -0.077 km/s) respectively as abundance of Fe-Ti oxide minerals vary as a result of alteration processes. They are also consistent with well-log results of Hole 1105A and Hole 735 B from the bank. The mean bulk density of the rocks is 2.93+ or -0.15 gm/c (super 3) . The other index properties-porosity, void ratio and grain density and their means are consistent with model populations of the rock minerals.
Language:
English
Genre:
Serial
Rights:
URL:
Coverage: Geographic coordinates: North:-32.4300 West:57.1700 East:
57.1700 South:-32.4300
Keywords: General geophysics; alteration; Atlantis Bank; body waves; bulk density; cores; density; elastic waves; gabbros; geophysical methods; grain density; igneous rocks; Indian Ocean; laboratory studies; Leg 179; lithostratigraphy; Ocean Drilling Program; olivine gabbro; P-waves; physical properties; plutonic rocks; porosity; seismic methods; seismic waves; Southwest Indian Ridge; velocity;
.