TY - JOUR
T1 - Origin of galena and sphalerite mineralization in the Koru Volcanics, Biga Peninsula, Turkey
T2 - Insights from MELTS modelling and SUPCRT calculations
AU - Yildirim, Demet Kiran
AU - Kilinc, Attila
AU - Suner, Fikret
AU - Kumral, Mustafa
AU - Ustunisik, Gokce K.
AU - Budakoglu, Murat
PY - 2013/5/1
Y1 - 2013/5/1
N2 - Tertiary volcanism (34.3 ± 1.2 Ma and 0.4 ± 0.7 Ma) in NW Turkey produced lead + zinc bearing trachyte, latite, dacite and rhyodacite tuffs, and agglomerates, as well as basaltic andesite, andesite, dacite, and rhyolite lavas. The primary objective of this study is to develop quantitative models for the evolution of magmas that produced these rocks and for the dissolution, transport, and deposition of disseminated ore as sphalerite and galena vein deposits. Our petrogenetic modelling using the MELTS algorithm (Ghiorso, M.S., and Sack, R.O., 1995, Chemical mass transfer in magmatic processes IV: a revised and internally consistent thermodynamic model for the interpolation and extrapolation of liquid-solid equilibria in magmatic systems at elevated temperatures and pressures: Contributions to Mineralogy and Petrology, v. 119, p. 197-212) indicates that the ore-bearing volcanic rocks reflect mixing of a basaltic andesite parental magma with a rhyolite magma. In addition, our aqueous geochemistry modelling using the SUPCRT indicates that controlling parameters of the vein deposits were pH = 5.3-9.2, fO2 = 10 -55-10-46 at 150°C and + S = 10-3 molal. At 250°C, compared with 150°C, the mineral stability field is more oxidized, yet the pH range is not significantly different (pH = 5.8-9.8, fO2 = 10-34-10-43).
AB - Tertiary volcanism (34.3 ± 1.2 Ma and 0.4 ± 0.7 Ma) in NW Turkey produced lead + zinc bearing trachyte, latite, dacite and rhyodacite tuffs, and agglomerates, as well as basaltic andesite, andesite, dacite, and rhyolite lavas. The primary objective of this study is to develop quantitative models for the evolution of magmas that produced these rocks and for the dissolution, transport, and deposition of disseminated ore as sphalerite and galena vein deposits. Our petrogenetic modelling using the MELTS algorithm (Ghiorso, M.S., and Sack, R.O., 1995, Chemical mass transfer in magmatic processes IV: a revised and internally consistent thermodynamic model for the interpolation and extrapolation of liquid-solid equilibria in magmatic systems at elevated temperatures and pressures: Contributions to Mineralogy and Petrology, v. 119, p. 197-212) indicates that the ore-bearing volcanic rocks reflect mixing of a basaltic andesite parental magma with a rhyolite magma. In addition, our aqueous geochemistry modelling using the SUPCRT indicates that controlling parameters of the vein deposits were pH = 5.3-9.2, fO2 = 10 -55-10-46 at 150°C and + S = 10-3 molal. At 250°C, compared with 150°C, the mineral stability field is more oxidized, yet the pH range is not significantly different (pH = 5.8-9.8, fO2 = 10-34-10-43).
KW - fractional crystallization
KW - galena
KW - Koru Volcanics
KW - magma mixing
KW - MELTS algorithm
KW - sphalerite
KW - SUPCRT algorithm
UR - http://www.scopus.com/inward/record.url?scp=84877117095&partnerID=8YFLogxK
U2 - 10.1080/00206814.2012.744441
DO - 10.1080/00206814.2012.744441
M3 - Article
AN - SCOPUS:84877117095
SN - 0020-6814
VL - 55
SP - 830
EP - 841
JO - International Geology Review
JF - International Geology Review
IS - 7
ER -