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Title: Early cretaceous platform-margin configuration and evolution in the central Oman mountains, Arabian peninsula

Abstract

The Hajar Supergroup (Middle Permian-Lower Cretaceous) of northeastern Oman records rifting and development of a passive margin along the edge of the Arabian platform facing Neo-Tethys. The Jurassic and Lower Cretaceous part, comprising the Sahtan, Kahmah, and Wasia groups, was deposited during the maximum extent of the broad epicontinental sea landward of this margin. These limestone units reach a total of 1500 m in thickness and correlate with the hydrocarbon reservoirs of the Arabian Peninsula. The trace of the Jurassic and Cretaceous margin in northeastern Oman followed a zigzag series of rift segments, resulting in promontories and reentrants that changed in position through time in response to the configuration and differential motion of underlying rift blocks. Synsedimentary normal faulting occurred locally in the Middle Jurassic, whereas in the Late Jurassic, the margin was eroded from variable uplift of up to 300 m before subsiding to below storm wave base. This uplift may have been caused by compression from oceanic crust that obducted along the southeastern side of the platform. The Lower Cretaceous succession in the central Oman Mountains and adjacent subsurface began with regional drowning around the Jurassic-Cretaceous boundary. The succession in the east (Saih Hatat) records a single regressivemore » sequence, ending in the progradation of the shallow-water carbonate platform by the Cenomanian. However, the succession in the west (Jebel Akhdar and interior) is dominated by shallow-water carbonate facies, but punctuated by a second regional drowning in the late Aptian. A third, Late Cretaceous drowning terminated deposition of the Wasia Group in the Turonian and was caused by convergence of oceanic crust and foreland basic formation. The record of tectonic behavior of carbonate platforms has important implications for the development of hydrocarbon source rocks and porosity. 68 refs., 11 figs., 1 tab.« less

Authors:
 [1];  [2]
  1. (Univ. of Saskatchewan, Saskatoon (Canada))
  2. (Univ. Innovation Centre, Swansea (United Kingdom))
Publication Date:
OSTI Identifier:
6106701
Alternate Identifier(s):
OSTI ID: 6106701
Resource Type:
Journal Article
Journal Name:
AAPG Bulletin (American Association of Petroleum Geologists); (United States)
Additional Journal Information:
Journal Volume: 77:2; Journal ID: ISSN 0149-1423
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 58 GEOSCIENCES; HYDROCARBONS; DEPOSITION; LIMESTONE; ORIGIN; OMAN; GEOLOGIC HISTORY; BASEMENT ROCK; CONTINENTAL MARGIN; CRETACEOUS PERIOD; GEOLOGIC FAULTS; GEOLOGIC STRUCTURES; MOUNTAINS; OCEANIC CRUST; PLATE TECTONICS; RESERVOIR ROCK; RIFT ZONES; ARAB COUNTRIES; ASIA; CARBONATE ROCKS; DEVELOPING COUNTRIES; EARTH CRUST; GEOLOGIC AGES; GEOLOGIC FRACTURES; MESOZOIC ERA; MIDDLE EAST; ORGANIC COMPOUNDS; ROCKS; SEDIMENTARY ROCKS; TECTONICS 020200* -- Petroleum-- Reserves, Geology, & Exploration; 580000 -- Geosciences

Citation Formats

Pratt, B.R., and Smewing, J.D. Early cretaceous platform-margin configuration and evolution in the central Oman mountains, Arabian peninsula. United States: N. p., 1993. Web.
Pratt, B.R., & Smewing, J.D. Early cretaceous platform-margin configuration and evolution in the central Oman mountains, Arabian peninsula. United States.
Pratt, B.R., and Smewing, J.D. Mon . "Early cretaceous platform-margin configuration and evolution in the central Oman mountains, Arabian peninsula". United States.
@article{osti_6106701,
title = {Early cretaceous platform-margin configuration and evolution in the central Oman mountains, Arabian peninsula},
author = {Pratt, B.R. and Smewing, J.D.},
abstractNote = {The Hajar Supergroup (Middle Permian-Lower Cretaceous) of northeastern Oman records rifting and development of a passive margin along the edge of the Arabian platform facing Neo-Tethys. The Jurassic and Lower Cretaceous part, comprising the Sahtan, Kahmah, and Wasia groups, was deposited during the maximum extent of the broad epicontinental sea landward of this margin. These limestone units reach a total of 1500 m in thickness and correlate with the hydrocarbon reservoirs of the Arabian Peninsula. The trace of the Jurassic and Cretaceous margin in northeastern Oman followed a zigzag series of rift segments, resulting in promontories and reentrants that changed in position through time in response to the configuration and differential motion of underlying rift blocks. Synsedimentary normal faulting occurred locally in the Middle Jurassic, whereas in the Late Jurassic, the margin was eroded from variable uplift of up to 300 m before subsiding to below storm wave base. This uplift may have been caused by compression from oceanic crust that obducted along the southeastern side of the platform. The Lower Cretaceous succession in the central Oman Mountains and adjacent subsurface began with regional drowning around the Jurassic-Cretaceous boundary. The succession in the east (Saih Hatat) records a single regressive sequence, ending in the progradation of the shallow-water carbonate platform by the Cenomanian. However, the succession in the west (Jebel Akhdar and interior) is dominated by shallow-water carbonate facies, but punctuated by a second regional drowning in the late Aptian. A third, Late Cretaceous drowning terminated deposition of the Wasia Group in the Turonian and was caused by convergence of oceanic crust and foreland basic formation. The record of tectonic behavior of carbonate platforms has important implications for the development of hydrocarbon source rocks and porosity. 68 refs., 11 figs., 1 tab.},
doi = {},
journal = {AAPG Bulletin (American Association of Petroleum Geologists); (United States)},
issn = {0149-1423},
number = ,
volume = 77:2,
place = {United States},
year = {1993},
month = {2}
}