Chamov, N. P. and Kurnosov, V. B. (2001): Epigenesis of sediments in the Cascadia accretionary prism, western continental margin of United States

Leg/Site/Hole:
ODP 146
ODP 146 888
ODP 146 889
ODP 146 890
ODP 146 891
ODP 146 892
Identifier:
2002-025557
georefid
Creator:
Chamov, N. P.
Russian Academy of Sciences, Geological Institute, Moscow, Russian Federation
author
Kurnosov, V. B.
author
Identification:
Epigenesis of sediments in the Cascadia accretionary prism, western continental margin of United States
2001
Lithology and Mineral Resources
MAIK Nauka/Interperiodica Publishing, Birmingham, AL, United States
36
5
445-459
Upper Miocene to Holocene sediments from the Cascadia accretionary prism and its oceanic surroundings drilled during ODP Leg 146 are studied in order to reveal their alteration during the accretion. The conclusion is made that methane-bearing solutions play a leading role in the transportation of material and the formation of mineralogical-geochemical zonality within the prism. A considerable intensity and high rates of epigenetic alteration are noted. It is shown that low heat flow, absence of progressive subsidence of the accretionary prism, open character of the system relative to water circulation, and heterogeneity of the sedimentary sequence hindered the successive development of epigenesis.
English
Serial
Coverage:Geographic coordinates:
North:48.4159
West:-126.5253East: -125.0705
South:44.3838
Sedimentary petrology; Oceanography; accretionary wedges; aliphatic hydrocarbons; alkanes; alteration; Cascadia Basin; Cenozoic; chemical composition; clastic sediments; clay minerals; compression tectonics; concentration; continental margin; East Pacific; faults; fracture zones; geochemistry; Holocene; hydrocarbons; Leg 146; marine sediments; methane; mineral composition; Miocene; Neogene; North Pacific; Northeast Pacific; ocean circulation; Ocean Drilling Program; ODP Site 888; ODP Site 889; ODP Site 890; ODP Site 891; ODP Site 892; organic compounds; Pacific Ocean; petrography; petrology; provenance; Quaternary; sand; sedimentary rocks; sediments; sheet silicates; silicates; silt; solutions; subduction zones; tectonics; Tertiary; transformations; United States; upper Miocene;
.