Mineralogy, petrography and origin of hydrothermal alteration in Eocene magmatites in Central Anatolia (Sivas-Turkey)

Three different types of hydrothermal alterations have occurred in the Eocene magmatics of the northern part of Sivas-Turkey which include propylitic phyllic / sericitic and argillic. Hydrothermal alteration affected both Karataş volcanites and Kösedağ syenite. The clay formations are concentrated in two major zones; extending in NE-SW direction and intersecting both plutonic and volcanic rocks with circular opening cracks within the volcanics parallel to the plutonic-volcanic contact. Hypogene and supergene hydrothermal alteration products occurring on surface and/or near surface conditions represent the primary and secondary minerals that develop directly and mostly from feldspars with the mechanisms of neoformation and/or degradation. The hypogene minerals are formed in two stages of early (kaolinite, pyrophyllite, illite, I-S (illite-smectite), smectite, quartz and opal-CT) and late (barite, ore minerals, alunite, goyazite, jarosite, chlorite and C-S). Tourmaline, epidote and carbonates (calcite, dolomite, azurite and malachite) are considered as metasomatic and supergeneous minerals, respectively. The most common mineral paragenesis are kaolinite + quartz + goethite + goyazite or alunite, kaolinite + quartz + jarosite + feldspar ± goethite and/or goyazite in the argillic alteration zone, I-S + quartz + jarosite ± goethite ± feldspar as well as I-S + quartz + feldspar minerals in the sericitic alteration zone. Kaolinite (T) is mostly in the form of pseudohexagonal platies, I-S (R1, R3 as argillic alteration origins, 1Md, 2M1, 1M and R3 as sericitic alteration origins) forming fi ber-acicular bundles parallel to each other.

Keywords:

plutonic, volcanic, XRD SEM, Alteration zone and type,

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ISSN: 0026-4563
Yayın Aralığı: Yılda 3 Sayı
Başlangıç: 1950
Yayıncı: Cahit DÖNMEZ

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