含金石英脉形成过程中的氧化钛活性：封闭系统行为的证据

IF 1.1 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Journal of Geosciences Pub Date : 2022-05-22 DOI:10.3190/jgeosci.340

K. Pacak, J. Zacharias, M. Němec

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引用次数: 0

摘要

使用五个具有已知P–T历史的波西米亚金矿床的脉石英和岩浆石英的钛含量来计算/讨论在250–550°C和0.1–4 kbar下，在没有Ti缓冲相的情况下形成的天然石英的氧化钛活性（TiO2）。数据表明，在脉石英形成过程中，由于P、T和生长速率的变化，TiO2发生了显著变化。对于与侵入有关的金矿床，TiO2和石英形成温度之间存在负相关性，这意味着石英在封闭系统条件下沉淀（即上升流体与围岩没有实质平衡）。我们提出了一种量化不平衡石英形成的关系，该关系可以很容易地应用于具有已知P–T历史的石英。这种关系在表现出快速和慢速的自然样本上进行了测试

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

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 (a TiO 2 ) 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 a TiO 2 during vein quartz formation, due to variation of P, T and growth rate. Negative correlation between a TiO 2 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

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来源期刊

Journal of Geosciences GEOSCIENCES, MULTIDISCIPLINARY-MINERALOGY

CiteScore

2.30

自引率

7.10%

发文量

审稿时长

>12 weeks

期刊介绍： The Journal of Geosciences is an international peer-reviewed journal published by the Czech Geological Society with support from the Czech Geological Survey. It accepts high-quality original research or review papers dealing with all aspects of the nature and origin of igneous and metamorphic rocks. The Journal focuses, mainly but not exclusively, on: -Process-oriented regional studies of igneous and metamorphic complexes- Research in structural geology and tectonics- Igneous and metamorphic petrology- Mineral chemistry and mineralogy- Major- and trace-element geochemistry, isotope geochemistry- Dating igneous activity and metamorphic events- Experimental petrology and mineralogy- Theoretical models of igneous and metamorphic processes- Mineralizing processes and mineral deposits. All the papers are written in English, even though they may be accompanied by an additional Czech abstract. Each contribution is a subject to peer review by at least two independent reviewers, typically at least one from abroad. The Journal appears 2 to 4 times a year. Formally it is divided in annual volumes, each of them including 4 issues.