The crystallization temperature of vein quartz estimated from the concentration of the titanium paramagnetic center in quartz: A case study of the Peschanka porphyry copper–molybdenum–gold deposit, Western Chukchi Peninsula, Russia


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Abstract

The concentration of the Al and Ti paramagnetic impurity centers in pre-ore and ore-stage quartz at the Peschanka porphyry copper–molybdenum–gold deposit in the Western Chukchi Peninsula, Russia were determined using electron paramagnetic resonance spectroscopy (EPR). The [AlO4-/h+]0 concentration in pre-ore and ore-stage quartz varies from 29 to 124 and from 13 to 101 at. ppm, respectively. The contents of the [TiO4-/Li+]0 and [TiO4-/H+]0 centers reach 20 and 6.3 at. ppm, respectively. Pre-ore quartz associated with the formation of biotite–potassium feldspar–quartz alteration and ore-stage quartz associated with the formation of quartz–sericite rocks followed by the ore deposition differ considerably in the Ti center content, especially the [TiO4-/H+]0 center. The [TiO4-/H+]0 concentration is much higher in the pre-ore quartz (>2 at. ppm) than that in the ore-stage quartz related to copper mineralization (<2 at. ppm). The [TiO4-/Li+]0 concentration also decreases from pre-ore to ore-stage quartz. Taking the data we obtained into account, the formation temperature of pre-ore and ore-stage quartz estimated from a titaniumin-quartz geothermometer is 590–470°C (weighted average 520°C) and 510–310°C (weighted average 430°C), respectively. The obtained temperature range of 590 to 310°C is similar to that determined from homogenization of fluid inclusions in quartz.

About the authors

A. D. Prudnikova

Department of Geology

Author for correspondence.
Email: nasemina@gmail.com
Russian Federation, Moscow, 119991

D. G. Koshchug

Department of Geology

Email: nasemina@gmail.com
Russian Federation, Moscow, 119991

S. V. Vyatkin

Department of Geology

Email: nasemina@gmail.com
Russian Federation, Moscow, 119991

I. A. Baksheev

Department of Geology

Email: nasemina@gmail.com
Russian Federation, Moscow, 119991

E. V. Nagornaya

Department of Geology

Email: nasemina@gmail.com
Russian Federation, Moscow, 119991

L. I. Marushchenko

Department of Geology

Email: nasemina@gmail.com
Russian Federation, Moscow, 119991

Yu. N. Nikolaev

Department of Geology

Email: nasemina@gmail.com
Russian Federation, Moscow, 119991

A. F. Chitalin

Institute of Geotechnologies LLC

Email: nasemina@gmail.com
Russian Federation, Moscow, 119234

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