Abstract
The Miocene magmatic intrusion in the Tavşanlı zone of the Kütahya-Bolkardağ Belt (KBB) in the northwestern region of Turkey is represented by the Eğrigöz granitoids. This paper studies the petrology and geochemistry of hydrothermal alterations associated with the vein-type Cu-Pb-Zn mineralization hosted by this pluton, focusing on the determination of the mass gains and losses of chemical components, which reflect the chemical exchanges between the host rocks and hydrothermal fluids. Vein-type Cu-Pb-Zn mineralization is closely associated with intense hydrothermal alterations within the brecciation, quartz stockwork veining, and brittle fracture zones that are controlled by NW-SE trending faults cutting through the Eğrigöz granitoids. Paragenetic relationships reveal three stages of mineralization: pre-ore, ore, and supergene. The ore mineralogy typically includes hypogene chalcopyrite, sphalerite, galena, and pyrite, with locally supergene covellite, malachite, and azurite. Wall-rock hypogene hydrothermal alterations include pervasive silicification, sulfidation, sericitization, and selective carbonatization and albitization. These are distributed in three main alteration zones (zone 1: silicified/iron carbonatized alterations ± albite, zone 2: argillic-silicic alterations, and zone 3: phyllic alterations). Based on the gains and losses of mass and volume (calculated by the GEOISO-Windows™ program), zone 1 has a higher mass and volume gain than zones 2 and 3. Non-systematic zonal distributions of alterations are observed in which the silicic-carbonate alterations +/− albitization appeared in zone 1 in the center and the phyllic-argillic alterations appeared in zones 2 and 3, with an increase in base metals (Cu-Pb-Zn) in the zone from Cu, Cu-Pb, to Cu-Pb-Zn moving outwards.
Highlights
Introductionthe largerTethyan-Eurasian metallogenic belt (TEMB) was formed during Mesozoic and Early Cenozoic times [1]
The metallogenic belt in Turkey lies within the Anatolian tectonic belt which is a part of the largerTethyan-Eurasian metallogenic belt (TEMB)
This paper focuses on the vein-type Cu-Pb-Zn mineralization in Eğrigöz granitoids with special reference to the petrology and geochemistry of different hydrothermal alteration zones around the mineralized veins in the mine area by applying the mass and volume gains and losses of chemical components during the alteration process, which reflect chemical exchanges between wall rocks and hydrothermal fluids [15,16,17,18,19]
Summary
TEMB was formed during Mesozoic and Early Cenozoic times [1]. In the western part of this belt, mineralization was controlled by extensional events that took place after the closure of the NeoTethys [1]. It is linked with the subduction of Neothyan oceanic crust remnants beneath the Anatolian plate along the Aegean-Cyprean Arc. It is linked with the subduction of Neothyan oceanic crust remnants beneath the Anatolian plate along the Aegean-Cyprean Arc This mineralization is related to the Oligocene-Miocene/Pliocene calc-alkaline magmatic activity during post-collision continent-continent setting and includes Pb-Zn, Sb, As, and Au-Cu deposits [1]. Kuşcu et al [2]
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