Skip to Main Content
Skip Nav Destination

Sequential formation of natrolite-group zeolites in amygdules of basaltic lavas

Sevgi Ozen and M. Cemal Goncuoglu
Sequential formation of natrolite-group zeolites in amygdules of basaltic lavas
The Canadian Mineralogist (July 2015) 53 (4): 757-765


Natrolite-group minerals were found in amygdules in Middle Eocene basaltic lavas in northern central Anatolia and have been evaluated in detail by petrographical, mineralogical, and chemical studies. A sequential formation of zeolites, which occurred in response to the interaction of the host rock with heated water, was determined by examination of the mineral assemblage. The compounds necessary for the formation of secondary minerals might have been derived from alteration of volcanic glass and Ca-rich pyroxenes in the host rock as well as from the associated marine sediments. Formation of fibrous zeolites on the walls of the amygdules began with a Na-rich zeolite, followed by a progressive increase in Ca content, and ended with a Ca-rich zeolite. The growth of natrolite as the earliest phase starts around an unidentified nucleus. It is followed by mesolite, which forms epitaxial overgrowths with natrolite. Scolecite is the last zeolite in the crystallization sequence. A continuous increase of the Si/Al ratio is observed from the earlier phase towards the later ones. The latest phase occupying the cavities within the amygdules is calcite.

ISSN: 0008-4476
EISSN: 1499-1276
Coden: CAMIA6
Serial Title: The Canadian Mineralogist
Serial Volume: 53
Serial Issue: 4
Title: Sequential formation of natrolite-group zeolites in amygdules of basaltic lavas
Affiliation: Recep Tayyip Erdogan University, Industrial Design Engineering, Rize, Turkey
Pages: 757-765
Published: 201507
Text Language: English
Publisher: Mineralogical Association of Canada, Ottawa, ON, Canada
References: 30
Accession Number: 2016-076576
Categories: Mineralogy of silicatesIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
N39°30'00" - N40°00'00", E35°00'00" - E35°30'00"
Secondary Affiliation: Middle East Technical University, TUR, Turkey
Country of Publication: Canada
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Association of Canada. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201637
Close Modal

or Create an Account

Close Modal
Close Modal