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EVIDENCE OF PERMO‐CARBONIFEROS GLACIATION IN THE BASAL MURBAT SANDSTONE FORMATION, SOUTHERN REGION, SULTANATE OF OMAN
Author(s) -
Qidwai H.A.,
Khalifa M.I.,
Bamkhalif Khalid A.
Publication year - 1988
Publication title -
journal of petroleum geology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.725
H-Index - 42
eISSN - 1747-5457
pISSN - 0141-6421
DOI - 10.1111/j.1747-5457.1988.tb00802.x
Subject(s) - diamictite , geology , clastic rock , sedimentary rock , carboniferous , paleontology , basement , sedimentary structures , tournaisian , geochemistry , red beds , dike , ordovician , facies , structural basin , archaeology , history
The most massive basal diamictite of the Murbat Sandstone Formation exhibits many sedimentary features which indicate its subglacial deposition. Some of the most important features are: (1)straited and grooved sandstone slivers within the diamictete;(2)striated and faceted clasts; (3)small stratified sandstone lenses within the diamictite; (4)“dropstones” or “out‐of‐size clasts” in the shale; and (5) the large lateraal and vertical extent of the diamictite. The overlying sequence of the Murbat Sandstone Formation consits of an alternating succession of conglaomerate and sandstone followed by silstone and shale, whose sedimentary structures, however, suggest their deposition in deeper‐water basins. The Murbat Sandstone Formation has been assigned to various ages ranging from Infra‐Cambrian to Ordovician by different workers, in view of its isolated occurence and the absence of flora and fauna. The Metal Mining Agency of Japan, however, has dated the Murbat Sandstone Formation as Permo‐Carboniferous, as it uncomfomably overlies Lower Carboniferous dikes of the crystalline Basement. The dikes have been dated by the K‐Ar method.