Mineralization, textural and alteration characteristics of the Şahinli (Sırakayalar and Karatepe) low-sulfidation epithermal deposit (Lapseki, NW Turkey)

2022-5-06
Dilekler, Gülnur
The Şahinli Au-Ag deposit is located in Lapseki (Çanakkale), within the NW part of the Biga Peninsula. Mineralized veins are hosted in Permo-Triassic Çamlıca metamorphics and dacite porphyries of middle Eocene Beyçayır volcanics. Au-Ag mineralization occurs in two distinct zones, the Sırakayalar and Karatepe sectors, which occupy eastern and western flanks of a NW-trending steeply-incised valley, respectively. Karatepe comprises a series of structurally-controlled NNW- and E–W-trending, steeply-dipping quartz veins hosted within dacite porphyry and mica schist. Mineralized veins in Sırakayalar, however, have been largely disrupted and displaced except for locally-preserved rootless veins. These veins are preserved as blocks within an intensely oxidized clay-cemented talus separated from the underlying metamorphic basement by a damage zone. Unoxidized mineralized veins were also observed within upper levels of the schists. Karatepe and Sırakayalar orebodies show many similarities in terms of ore/gangue mineralogy, alteration styles, vein paragenesis, and textural characteristics. Periodic hydrothermal activity in both areas resulted in development of a variety of vein textures from early massive silica to later bladed, crustiform-colloform, and cockade textures, most of which have been later brecciated episodically. Massive gray quartz veins with Au°, electrum, pyrite, and arsenopyrite yield highest Au-Ag grades. Wall-rock alteration is characterized by an inner zone of silicification enveloped by quartz-sericite ±kaolinite ±chlorite ±adularia alteration. The Şahinli mineralization exhibits characteristics of low-sulfidation epithermal deposits worldwide and in Biga Peninsula, including the adjacent Lapseki Au deposit as well as Madendağ and Küçükdere deposits. Disrupted veins at Sırakayalar represent the first example of a buried epithermal system in Biga Peninsula and suggests potential for similar epithermal Au-Ag mineralization in the region under younger cover.

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Citation Formats
G. Dilekler, “Mineralization, textural and alteration characteristics of the Şahinli (Sırakayalar and Karatepe) low-sulfidation epithermal deposit (Lapseki, NW Turkey),” M.S. - Master of Science, Middle East Technical University, 2022.