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GEOREF RECORD

New occurrences of diagenetic faujasite in the Quaternary tuffs of north-east Jordan

Khalil Ibrahim and Anthony Hall
New occurrences of diagenetic faujasite in the Quaternary tuffs of north-east Jordan
European Journal of Mineralogy (October 1995) 7 (5): 1129-1135

Abstract

Three new localities for diagenetic faujasite (with phillipsite and chabazite) have been discovered in Quaternary tuffs in NE Jordan. The distribution of these zeolites shows a vertical zonation in which a phillipsite-chabazite zone is underlain by a faujasite-phillipsite zone, corresponding with the crystallization sequence faujasite-phillipsite-chabazite. The faujasite constitutes up to 30% of the rock in the lower zone, and occurs as octahedral crystals 50-300 mu m in size. A first generation of faujasite occurs lining cavities and is characterized by a lower K content (K (sub 2) O 0.20-0.55 wt.%), whereas the second generation occupies the centre of the cavities and has a higher K content (K (sub 2) O 2.42-2.93 wt.%); the Si/(Si + Al + Fe) ratio is 0.695-0.718. The formation of faujasite and other zeolites is attributed to the alteration and leaching of sideromelane in an open hydrological system by percolating meteoric water. EPMA results are reported for sideromelane, palagonite and faujasites (8).


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 7
Serial Issue: 5
Title: New occurrences of diagenetic faujasite in the Quaternary tuffs of north-east Jordan
Affiliation: University of London, Geology Department, Surrey, United Kingdom
Pages: 1129-1135
Published: 199510
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 15
Accession Number: 1996-001703
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, geol. sketch maps
N29°00'00" - N33°30'00", E34°30'00" - E39°00'00"
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199601
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