Phosphatic hardgrounds and hiatus concretions in neogene marine sequences of California coastal ranges

Conference · Tue Mar 01 04:00:00 EST 1988 · AAPG Bull.; (United States)

OSTI ID:6835494

Garrison, R E; Foellmi, K B; Friede, K M; Kastner, M; Ramirez, P C

Distinctive phosphatic intervals mark hiatuses of varying durations at several localities along the central California coast. At Capitola in the La Honda basin, a complex series of carbonate-cemented hardgrounds containing authigenic phosphatic nodules and marine vertebrate bones occurs within 50 cm of the upper Purisima Formation (Pliocene). Paleomagnetic measurements and diatom stratigraphy indicate that this 50-cm interval represents a hiatus of about 1 m.y. (4.5-3.5 Ma). At Naples Beach in the Santa Barbara basin, a severely condensed section of about 7 m of interbedded nodular phosphatic hardgrounds, phosphatic marlstones, and dolomites appears to represent as much as 5 m.y. (14.5-9.5 Ma). In the Lompoc Quarry of the Santa Maria basin, a thin phosphatic hardground at the contact between the Monterey and the Sisquoc Formations represents about 0.5-0.7 m.y. (between 7.0 and 6.0 Ma). At Mussel Rock in the Santa Maria basin, a nodular phosphatic conglomerate occurs at the boundary between the Monterey and Sisquoc Formations; the age of the conglomerate determined from diatom biostratigraphy is approximately 6.2 Ma (Messinian), but no time gap can be recognized given the resolution of diatom age dating. The phosphatic hardgrounds of Capitola, Lompoc Quarry, and Naples Beach appear to correspond to high sea level stands, whereas the conglomerate at Mussel Rock coincides with a sea level lowstand. During high sea level stands, depocenters shifted landward, leading to clastic-sediment starvation possibly accompanied by current-induced erosion and winnowing, which in term led to condensation and early diagenetic carbonate and phosphatic cementation.

• Research Organization: Univ. of California, Santa Cruz (USA)
• OSTI ID: 6835494
• Report Number(s): CONF-8804144-
• Conference Information: Journal Name: AAPG Bull.; (United States) Journal Volume: 72:3
• Country of Publication: United States
• Language: English

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02 PETROLEUM
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58 GEOSCIENCES
580100 -- Geology & Hydrology-- (-1989)
CALIFORNIA
CENOZOIC ERA
CONGLOMERATES
DEPOSITION
DIAGENESIS
FEDERAL REGION IX
GEOLOGIC AGES
GEOLOGIC FORMATIONS
GEOLOGIC HISTORY
NORTH AMERICA
ORIGIN
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SEDIMENTARY ROCKS
TERTIARY PERIOD
USA