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Received: 14 April 2020
Accepted: 15 February 2022
Online: 22 May 2022
H. Editor: J. Hora
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Original paper

Karel Pacák, Jiří Zachariáš, Matěj Němec

Titanium-oxide activity during the formation of gold-bearing quartz veins: evidence for closed system behavior

Journal of Geosciences, volume 67 (2022), issue 1, 19 - 32


Titanium contents of both vein and magmatic quartz from five Bohemian gold deposits with known P-T history were used to calculate/discuss the titanium oxide activities ( ) of natural quartz formed in the absence of Ti-buffering phases at 250-550 °C and 0.1-4 kbar.
Data suggest significant variations in during vein quartz formation, due to variation of P, T, growth rate and . Negative correlation between and quartz formation temperature was documented for intrusion-related gold deposits, implying quartz precipitation under closed-system conditions (i.e., without substantial equilibration of the ascending fluid with surrounding rocks). We propose a relationship for quantifying disequilibrium quartz formation that can be readily applied to quartz with known P-T history. The relationship was tested on natural samples exhibiting both rapid and slow crystallization. An example of extreme Ti enrichment (up to ~30 ×) in quartz, associated with its rapid growth, is described and discussed.

Journal of Geosciences, Published by © Czech Geological Society, with support from the Czech Geological Survey.
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ISSN: 1803-1943 (online), 1802-6222 (print)
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SNIP (Scopus, 2022): 0.826

IF (WoS, 2022): 1.4

5 YEAR IF (WoS, 2022): 1.8

Policy: Open Access

ISSN: 1802-6222

E-ISSN: 1803-1943