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Titolo:
FACIES SEQUENCES OF THE MIDDLE-UPPER JURASSIC CARBONATE PLATFORM (AMRAN GROUP) IN THE SANAA REGION, REPUBLIC-OF-YEMEN
Autore:
ALTHOUR KA;
Indirizzi:
SANAA UNIV,DEPT GEOL,POB 2027 SANAA YEMEN
Titolo Testata:
Marine and petroleum geology
fascicolo: 6, volume: 14, anno: 1997,
pagine: 643 - 660
SICI:
0264-8172(1997)14:6<643:FSOTMJ>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Keywords:
FACIES; JURASSIC; AMRAN GROUP; YEMEN;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
36
Recensione:
Indirizzi per estratti:
Citazione:
K.A. Althour, "FACIES SEQUENCES OF THE MIDDLE-UPPER JURASSIC CARBONATE PLATFORM (AMRAN GROUP) IN THE SANAA REGION, REPUBLIC-OF-YEMEN", Marine and petroleum geology, 14(6), 1997, pp. 643-660

Abstract

Rocks of the Amran Group in the Sana'a region of Yemen disconformablyoverlie the Kohlan Formation and unconformably underlie the Tawilah Group. Sea-level rises have produced landward migration of facies beltsand the development of deeper water facies over shallow ones. The geometry of the depositional environments identified has enabled the passage of relatively short-lived transgressive-regressive cycles of sedimentation to be recognized. Three facies associations are introduced: (1) Carbonate platform facies, (2) Carbonate-marl alternation facies, and (3) Shallow water coral and stromatoporoid build-up facies. These facies are widely distributed and the whole sequence reflects deposition on a broad platform upon which shoals separated platform carbonates from basin sedimentation and an open marine environment. The repetition and interfingering of both fining-and shallowing-upward cycles within the study areas suggest that deposition occurred within the same basin with slightly different conditions in different places. The main factors controlling their deposition are sea-level changes and tectonics. (C) 1997 Elsevier Science Ltd.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 13/07/20 alle ore 07:40:48