Bibliographic Citation
| Document | For copies of Journal Articles, please contact the Publisher or your local public or university library and refer to the information in the Resource Relation field. For copies of other documents, please see the Availability, Publisher, Research Organization, Resource Relation and/or Author (affiliation information) fields and/or Document Availability. |
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| Title | Sedimentation response to earthquake-related events, Middle Eocene Ventura Basin, California |
| Creator/Author | Clark, M.S. (ARCO Oil and Gas Company, Bakersfield, CA (United States)) |
| Publication Date | 1994 Apr 01 |
| OSTI Identifier | OSTI ID: 6899710 |
| Report Number(s) | CONF-9404149-- |
| Other Number(s) | ISSN0149-1423; CODEN: AABUD2 |
| Resource Type | Conference |
| Specific Type | Journal Article |
| Resource Relation | AAPG Bulletin (American Association of Petroleum Geologists) ; Vol/Issue: 78:4; American Association of Petroleum Geologists (AAPG) Pacific Section meeting; 27-29 Apr 1994; Ventura, CA (United States) |
| Subject | 020200 -- Petroleum-- Reserves, Geology, & Exploration; CALIFORNIA-- GEOLOGIC STRATA;EOCENE EPOCH-- SEISMIC EVENTS;GEOLOGIC STRATA-- DEPOSITION;GEOLOGIC STRATA-- LIQUEFACTION;SEDIMENTARY BASINS-- GROUND SUBSIDENCE; EARTHQUAKES;EXPLORATION;MIGRATION;MOUNTAINS;SEDIMENTATION;SEDIMENTS;STRATIGRAPHY;TECTONICS |
| Related Subject | CENOZOIC ERA;DEVELOPED COUNTRIES;GEOLOGIC AGES;GEOLOGIC STRUCTURES;GEOLOGY;NORTH AMERICA;SEISMIC EVENTS;TERTIARY PERIOD;THERMOCHEMICAL PROCESSES;USA |
| Description/Abstract | Middle Eocene strata in the Topatopa Mountains, northeastern Ventura Basin, California, were deposited as five unconformity-bounded depositional sequences in a seismically-active basin characterized by rapid, episodic subsidence.^Analysis of stratigraphic geometries, detailed facies analysis, and backstripping-derived subsidence rates indicate that tectonically-induced differential subsidence caused basin-wide migrations of the Topatopa depocenter at least every 2 m.y.^Unusually abundant convolute laminations and a slumped interval may record the influence of earthquakes.^The convulate laminations do not grade downward into ripple laminations and are not associated with dewatering dikes and pipes as would be expected if the laminations were formed by shear from an overlying current or by dewatering during rapid burial.^Thus, formation during shock-induced liquefaction is more likely.^Also a 20-m thick slumped interval in the uppermost Cozy Dell Formation underlies a sequence boundary interpreted as a surface across which depocenter migration took place.^Association of this slumped interval with a tectonically-formed surface is consistent with deposition in a seismically-active environment.^Rapid, differential subsidence in the Topatopa depocenter was probably episodic and associated with seismic events.^Rapid, episodic subsidence with attending earthquakes is recorded in Holocene strata of the Humboldt basin, an analog to the Topatopa depocenter.^Also, A Middle Tertiary slumped interval in the southernmost San Joaquin basin is attributed to a seismic event.^Similar earthquake-related events are recorded by sedimentation patterns in the Middle Eocene Ventura Basin and may be evident in the strata of other active-margin basins as well. |
| Country of Publication | United States |
| Language | English |
| Format | Pages: 659 |
| System Entry Date | 2001 May 13 |
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