Journal of

GEOsciences

  (Formerly Journal of the Czech Geological Society)

< previous | issue | next >
 
Received: 14 April 2020
Accepted: 15 February 2022
Online: 22 May 2022
H. Editor: J. Hora
 
  full text (PDF, 4.42 MB)
 
Export to RIS
Export to BibTeX
Export to Mendeley
 

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

DOI: http://doi.org/10.3190/jgeosci.340



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.
Webdesign inspired by aTeo. Hosted at the server of the Institute of Petrology and Structural Geology, Charles University, Prague.
ISSN: 1803-1943 (online), 1802-6222 (print)
email: jgeosci(at)jgeosci.org
cover_rotated.gif, 15kB

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