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Abstract
Gulf Coast Association of Geological Societies Transactions
Volume 54 (2004)
EXTENDED ABSTRACT: Distribution
of Surface Sediments from the Southern California Continental Borderland
Conner, Lori S.1,2and
Dunn, Dean A.1
ABSTRACT
Based on sedimentary parameters a delineation
of the geographic distribution of sediment types and provinces was determined
for the Southern California Continental Borderland. Data were analyzed for
272 seafloor sediment samples taken from 44 gravity cores. Surface sediments
in the Borderland are silty clays, with only minor deposits of sand-silt-clay
and clayey silt. One core, taken off the western end of Santa Cruz Island,
contained 74.9% sand-sized grains. Cores with higher (10-50%) sand content
were found near offshore islands (Santa Cruz, San Nicholas, Santa Barbara,
and Santa Catalina) and atop seamounts (Lasuen Knoll) in the Borderland.
Cores with low-clay (<50%) content were taken in Santa Monica and Santa
Catalina basins. Similar cores with higher-sand content were obtained from
nearshore areas and atop shallow-water sub-marine ridges that separate northwest-southeast
trending basins within the Borderland. Low-silt (<30%) cores were found
in a NE-SW trend that extends from Newport Canyon across the southern Santa
Catalina Basin to San Clemente Island, and in deeper-water basins (San Nicholas
and Tanner) distal from the coastline. There is no apparent relationship
between sediment percentages and water depth; sediment type appears to be
influenced by proximity to shore, and by reworking of deposits atop shallow-water
submarine ridges between basins.
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