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Title: Depositional sequences and correlation of middle to Upper Miocene reef complexes, Nijar and Las Negras Areas, Southeastern Spain

During the Serravallian through Messinian, reefs fringed topographic highs that rimmed Neogene basins in the western Mediterranean. Detailed studies of middle to upper Miocene carbonate strata in the Nijar and Las Negras areas (southeastern Spain) document the effects of relative sea level change on sedimentation, biotic composition, reef development, and diagenesis. The authors have identified several previously unrecognized, regionally correlatable depositional sequences and erosional breaks that the authors interpret resulted from sea level fluctuations. Limited microfossil dating and correlation of depositional successions with third-order eustatic sea level curves suggest that most carbonate deposition occurred during the Serravallian and Tortonian, not Messinian as formerly thought. Uppermost strata (upper Tortonian> predominately comprise pack-stones and grainstones of distal to proximal reef-foreslope and reef-talus facies that dip 10/sup 0/-30/sup 0/. Reef core, mostly Porites framework, is locally preserved. Field geometries indicate minimum self-to-basin relief of 100 m. The authors' results of studies suggest that detailed field studies coupled with the use of published eustatic sea level curves may provide a powerful tool for correlation of middle to upper Miocene strata not only in Spain, but in the entire western Mediterranean.
Authors:
; ;
Publication Date:
OSTI Identifier:
6469178
Report Number(s):
CONF-880301-
Resource Type:
Conference
Resource Relation:
Conference: Annual meeting of the American Association of Petroleum Geologists, Houston, TX, USA, 20 Mar 1988
Publisher:
American Association of Petroleum Geologists,Tulsa, OK
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 03 NATURAL GAS; NATURAL GAS DEPOSITS; MINERALOGY; PETROLEUM DEPOSITS; REEFS; PETROGENESIS; SPAIN; PETROLEUM GEOLOGY; BIOGEOCHEMISTRY; CARBONATE ROCKS; CATAGENESIS; CORRELATIONS; DEPOSITION; EXPLORATION; GEOPHYSICS; MIOCENE EPOCH; SANDSTONES; SEDIMENTARY BASINS; SEDIMENTATION; CENOZOIC ERA; CHEMISTRY; DEVELOPING COUNTRIES; EUROPE; GEOCHEMISTRY; GEOLOGIC AGES; GEOLOGIC DEPOSITS; GEOLOGIC STRUCTURES; GEOLOGY; MINERAL RESOURCES; RESOURCES; ROCKS; SEDIMENTARY ROCKS; TERTIARY PERIOD; WESTERN EUROPE 020200* -- Petroleum-- Reserves, Geology, & Exploration; 030200 -- Natural Gas-- Reserves, Geology, & Exploration