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Zeolitic alteration in the Tertiary Feres volcano-sedimentary basin, Thrace, NE Greece

Christidis Georgios, T. Markopoulos, T. Marantos

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URIhttp://purl.tuc.gr/dl/dias/8C4DE11E-6080-4DCF-97BA-F3794F06D9AF-
Αναγνωριστικόhttps://doi.org/10.1180/minmag.2007.071.3.327-
Γλώσσαen-
Μέγεθος19 pagesen
ΤίτλοςZeolitic alteration in the Tertiary Feres volcano-sedimentary basin, Thrace, NE Greeceen
ΔημιουργόςChristidis Georgiosen
ΔημιουργόςΧρηστιδης Γεωργιοςel
ΔημιουργόςT. Markopoulosen
ΔημιουργόςT. Marantosen
ΠερίληψηThe Tertiary volcano-sedimentary sequence of the Feres basin (Thrace, NE Greece), includes lavas of andesitic–rhyolitic composition as well as volcaniclastic rocks, pyroclastic flows and pyroclastic fall deposits principally of dacitic–rhyodacitic composition. The pyroclastic flow deposits frequently show intense devitrification, vapour-phase crystallization and evidence of fumarolic activity, which involves deposition of scapolite in pore spaces. The Feres basin can be subdivided on the basis of mineral alteration assemblages: (1) the Pefka region; characterized by intense hydrothermal alteration of the volcanic rocks and mineral zoning (silicic, arg illic, sericitic and propylitic zones) with polymetallic mineralization, and (2) the remainder of the basin; where the volcaniclastic rocks are characterized by the alteration of volcanic glass to zeolites (clinoptilolite, heulandite, mordenite, analcime), clay minerals (smectite, illite, celadonite, chlorite), SiO2 polymorphs (cristobalite, opal-CT, quartz), K-feldspar and calcite. Laumontite is also present as an alteration product of plagioclase, with stilbite sporadically occurring in veinlets. Locally, rhyolites are also altered to zeolites (clinoptilolite and/or mordenite). The zeolitization process has occurred rapidly with the depositional environment, temperature, rate of cooling (of the volcanic rocks), nature and temperature of the mineral-forming fluids and composition of the parent material controlling the formation of zeolites. en
ΤύποςPeer-Reviewed Journal Publicationen
ΤύποςΔημοσίευση σε Περιοδικό με Κριτέςel
Άδεια Χρήσηςhttp://creativecommons.org/licenses/by/4.0/en
Ημερομηνία2015-10-01-
Ημερομηνία Δημοσίευσης2007-
Βιβλιογραφική ΑναφοράI. Marantos, T. Markopoulos , G. E. Christidis ,"Zeolitic alteration in the Tertiary Feres volcano-sedimentary basin, Thrace, NE Greece ",Min.Mag. ,vol.71, no.3 , pp.327-345 ,2007. doi :10.1180/minmag.2007.071.3.327en

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