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Quartz cement of meteoric origin in silcrete and nonsilcrete sandstones, Lower Carboniferous, western Sinai, Egypt by Antar Abdel-Wahab; Alaa M.K. Salem; Earle F. Mcbride is a Earth and Planetary Sciences article available to read on EtoBox.

What is Quartz cement of meteoric origin in silcrete and nonsilcrete sandstones, Lower Carboniferous, western Sinai, Egypt about?

Sandstones from western Sinai which are entirely or partly of Carboniferous age were not buried more than 1.5 km until the Late Cretaceous and younger, when the lowermost rocks reached a depth of 2.5 kmo The first diagenetic event was cementation by a trace to 4% of normal quartz overgrowths. Petrographic and O isotope data of the overgrowths are compatible with their precipitation from meteoric water at the surface to depths of a few hundred metres. These nonsilcrete sandstones lack the strong silicification typical of pedogenic or groundwater silcretes. Three anomalous beds are strongly cemented either by megaquartz and cryptocrystalline quartz (15-36%) or by microcrystalline quartz (8%); these beds have characteristics of silcretes. The silcretes, from 1-4 m thick, occur at the top of the Naqus Formation (Early Carboniferous?) and at or near the top of the Abu Thora and Abu Durba Formations (Early Carboniferous). Other formations contain incipient silcretes characterised by discontinuous pore spaces (between detrital grains and syntaxial cement) inferred to represent dissolved opal rinds, Oxygen isotope data for quartz cement in silcretes is compatible with the quartz precipitat

Who reads Quartz cement of meteoric origin in silcrete and nonsilcrete sandstones, Lower Carboniferous, western Sinai, Egypt?

Author

Antar Abdel-Wahab; Alaa M.K. Salem; Earle F. Mcbride

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 1464-343X)

Published

1998

Language

LA

Field

Earth and Planetary Sciences (Physical Sciences)