Courtier, Anna M. et al. (2006): Seismic properties of Leg 195 serpentinites and their geophysical implications

Leg/Site/Hole:
ODP 195
Identifier:
2006-066611
georefid
10.2973/odp.proc.sr.195.104.2004
doi
Creator:
Courtier, Anna M.
University of Wisconsin at Madison, Department of Geology and Geophysics, Madison, WI, United States
author
Hart, David J.
Geological Survey of Canada, Canada
author
Christensen, Nikolas I.
Ocean Drilling Program, United States
author
Identification:
Seismic properties of Leg 195 serpentinites and their geophysical implications
2006
In: Shinohara, Masanao (editor), Salisbury, Matthew H. (editor), Richter, Carl (editor), Araki, Eiichiro, Barr, Samantha R., D'Antonio, Massimo, Dean, Simon M., Diekmann, Bernhard, Edwards, K. Michelle, Fryer, Patricia B., Gaillot, Philippe J., Hammon, William S., III, Hart, David, Januszczak, Nicole, Komor, Stephen C., Kristensen, Mette B., Lockwood, John P., Mottl, Michael J., Moyer, Craig L., Nakahigashi, Kazuo, Savov, Ivan P., Su Xin, Wei, Kuo-Yen, Yamada, Tomoaki, Proceedings of the Ocean Drilling Program; scientific results; seafloor observatories and the Kuroshio Current; covering Leg 195 of the cruises of the drilling vessel JOIDES Resolution; Apra Harbor, Guam, to Keelung, Taiwan; Sites 1200-1202; 2 March-2 May 2001
Texas A&M University, Ocean Drilling Program, College Station, TX, United States
195
Knowledge of seismic velocities is necessary to constrain the lithologies encountered in seismic studies. We measured the seismic velocities, both compressional and shear wave, of clasts recovered during Ocean Drilling Program Leg 195 from a serpentine mud volcano, the South Chamorro Seamount. The compressional wave velocities of these clasts vary from a lower value of 5.5 km/s to an upper value of 6.1 km/s at a confining stress of 200 MPa. The shear wave velocities vary from a lower value of 2.8 km/s to an upper value of 3.3 km/s at a confining stress of 200 MPa. The densities of the samples vary from 2548 to 2701 kg/m (super 3) . These velocities and densities are representative of the highly serpentinized harzburgite and dunite mineralogy of the clasts. Velocities from a seismic study of the Izu-Bonin forearc wedge were used to calculate the degree of serpentinization in the forearc wedge. The seismic velocities of the forearc wedge are higher than the velocities of the clasts recovered from the South Chamorro Seamount, suggesting that the clasts are more serpentinized than the forearc wedge.
English
Serial
Coverage:Geographic coordinates:
North:25.0000
West:122.0000East: 147.0000
South:13.0000
Igneous and metamorphic petrology; Applied geophysics; density; elastic waves; geophysical methods; geophysical surveys; Izu-Bonin Arc; Leg 195; Mariana Trench; metaigneous rocks; metamorphic rocks; metasomatic rocks; mud volcanoes; North Pacific; Northwest Pacific; Ocean Drilling Program; Pacific Ocean; seismic methods; seismic waves; serpentinite; South Chamorro Seamount; stress; surveys; velocity; West Pacific;
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