Repeated reactivation of clogged permeable pathways in epithermal gold deposits: Kestanelik epithermal vein system, NW Turkey

Nilay Gülyuz, Zoe K. Shipton, Ilkay Kuşcu, Richard A. Lord, Nuretdin Kaymakcı, Ethan Gülyüz, David R. Gladwell

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This study presents a detailed study of the dimensions, geometry, textures and breccias of a well-exposed epithermal vein system, the Kestanelik gold deposit in the Biga Peninsula, NW Turkey and investigates the permeability enhancement mechanisms in epithermal gold deposits. Here mineralisation is associated with quartz veins up to 13.6 m thick. Vein textures and breccia components indicate repeated sealing and subsequent brecciation of wall rock and pre-existing vein infill. Field and petrographic analyses characterize E-W trending veins as left lateral faults, whilst NE- SW trending veins are extensional (Mode I) fractures. Cataclasite and tectonic breccia of wall rocks and early quartz, hydrothermal crackle breccias, and matrix supported chaotic breccias of pre- existing vein infill, all of which are cemented by late iron-oxide-bearing quartz, indicate that co- seismic rupturing and hydraulic fracturing are two major permeability enhancement mechanisms. In addition, transient variations in local stress direction, caused by syn-mineralisation dyke intrusion, may have enhanced permeability on mis-oriented surfaces and at locations where the dip changes. This study emphasizes the importance of understanding structural geology and kinematics as controls on the location of boiling and mineralisation mechanisms in epithermal gold deposits.
LanguageEnglish
Number of pages16
JournalJournal of the Geological Society
Early online date17 Jan 2018
DOIs
Publication statusE-pub ahead of print - 17 Jan 2018

Fingerprint

epithermal deposit
reactivation
gold
permeability
infill
mineralization
wall rock
breccia
texture
quartz
cataclasite
structural geology
quartz vein
sealing
iron oxide
dike
dip
kinematics
geometry
tectonics

Keywords

  • epithermal
  • veins
  • kinematics
  • gold deposits
  • earthquakes

Cite this

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title = "Repeated reactivation of clogged permeable pathways in epithermal gold deposits: Kestanelik epithermal vein system, NW Turkey",
abstract = "This study presents a detailed study of the dimensions, geometry, textures and breccias of a well-exposed epithermal vein system, the Kestanelik gold deposit in the Biga Peninsula, NW Turkey and investigates the permeability enhancement mechanisms in epithermal gold deposits. Here mineralisation is associated with quartz veins up to 13.6 m thick. Vein textures and breccia components indicate repeated sealing and subsequent brecciation of wall rock and pre-existing vein infill. Field and petrographic analyses characterize E-W trending veins as left lateral faults, whilst NE- SW trending veins are extensional (Mode I) fractures. Cataclasite and tectonic breccia of wall rocks and early quartz, hydrothermal crackle breccias, and matrix supported chaotic breccias of pre- existing vein infill, all of which are cemented by late iron-oxide-bearing quartz, indicate that co- seismic rupturing and hydraulic fracturing are two major permeability enhancement mechanisms. In addition, transient variations in local stress direction, caused by syn-mineralisation dyke intrusion, may have enhanced permeability on mis-oriented surfaces and at locations where the dip changes. This study emphasizes the importance of understanding structural geology and kinematics as controls on the location of boiling and mineralisation mechanisms in epithermal gold deposits.",
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Repeated reactivation of clogged permeable pathways in epithermal gold deposits : Kestanelik epithermal vein system, NW Turkey. / Gülyuz, Nilay; Shipton, Zoe K.; Kuşcu, Ilkay; Lord, Richard A.; Kaymakcı, Nuretdin; Gülyüz, Ethan; Gladwell, David R.

In: Journal of the Geological Society, 17.01.2018.

Research output: Contribution to journalArticle

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AU - Gülyuz, Nilay

AU - Shipton, Zoe K.

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AU - Lord, Richard A.

AU - Kaymakcı, Nuretdin

AU - Gülyüz, Ethan

AU - Gladwell, David R.

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