Thallium isotopes as indicators of ore mineralization at the Zn-rich sediment-hosted massive sulfide TL Deposit, British Columbia, Canada

IF 1 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Geochemistry-Exploration Environment Analysis Pub Date : 2023-01-09 DOI:10.1144/geochem2022-042

D. Knaack, K. Sullivan, M. Leybourne, C. Dunn, D. Layton-Matthews

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引用次数: 0

Abstract

Few studies have focused on the application of the Tl isotopic system for geochemical exploration. We report ε 205 Tl values of rock samples from the TL Deposit, British Columbia, Canada - a sediment-hosted massive sulfide (SHMS) deposit with characteristics of a Broken Hill-type deposit - and investigate relationships with major and trace element geochemistry. Maps generated using Tl isotope and trace element data indicate that ε 205 Tl values can potentially be used to fingerprint ore mineralization at the TL Deposit. The sources of Tl and other metals (Ag, Pb, Zn) are assessed using Tl isotope data. Measured ε 205 Tl values exhibit positive correlations with Pb, sedimentary exhalative (SEDEX) metal index (Zn+100*Pb+100*Tl), and the redox proxy, U/Th, and negative correlations with Be, Cd, Ce, La, Ni, and Th. Individual lithologies have distinct Tl isotopic compositions. Metal-rich heavily altered samples have relatively high ε 205 Tl values (-5.0 to -2.5 ε -units) reflecting the euxinic conditions of the global Paleoproterozoic ocean and hydrothermal influence. Samples with lower ε 205 Tl values (-15 to -7.6 ε -units) reflect a combination of their mineralogy (phyllosilicate minerals such as biotite and clinochlore), Tl from sediments reflecting the Tl isotopic composition of modern seawater, and possible low-temperature alteration processes. Samples with high Pb and Ag contents have high ε 205 Tl values, indicating a hydrothermal origin of these metals, whereas Zn is highest in samples with low ε 205 Tl values, indicating a low-temperature or sedimentary origin. Thallium isotopes, paired with conventional geochemical data, show promise as a useful tool for exploration of SHMS deposits with Broken Hill-type characteristics. Thematic collection: This article is part of the Geochemical processes related to mined, milled, or natural metal deposits collection available at: https://www.lyellcollection.org/topic/collections/geochemical-processes-related-to-mined-milled-or-natural-metal-deposits Supplementary material: https://doi.org/10.6084/m9.figshare.c.6370671

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加拿大不列颠哥伦比亚省富含锌沉积物的块状硫化物TL矿床中铊同位素作为成矿指标

在地球化学勘探中应用Tl同位素系统的研究很少。本文报道了加拿大不列颠哥伦比亚省Tl矿床岩石样品的ε 205 Tl值，并研究了其与主微量元素地球化学的关系。Tl矿床是一个具有破碎山型矿床特征的沉积型块状硫化物矿床。利用Tl同位素和微量元素数据生成的图表明，ε 205 Tl值有可能用于Tl矿床的矿化指纹。利用Tl同位素资料评估了Tl和其他金属(Ag、Pb、Zn)的来源。实测ε 205 Tl值与Pb、沉积呼气(SEDEX)金属指数(Zn+100*Pb+100*Tl)和氧化还原代理U/Th呈正相关，与Be、Cd、Ce、La、Ni、Th呈负相关。个别岩性具有不同的Tl同位素组成。富金属重蚀变样品具有较高的ε 205 Tl值(-5.0 ~ -2.5 ε -单位)，反映了全球古元古代海洋的缺氧条件和热液影响。ε 205 Tl值较低的样品(-15至-7.6 ε -单位)反映了它们的矿物学(黑云母和斜长石等层状硅酸盐矿物)，沉积物中的Tl反映了现代海水的Tl同位素组成，以及可能的低温蚀变过程。Pb和Ag含量高的样品ε 205 Tl值高，表明这些金属的热液成因;而Zn含量低的样品ε 205 Tl值最高，表明这些金属的低温或沉积成因。铊同位素与常规地球化学数据相结合，有望成为寻找具有破碎山型特征的SHMS矿床的有效工具。专题收集:本文是与开采、研磨或天然金属矿床收集相关的地球化学过程的一部分，可在:https://www.lyellcollection.org/topic/collections/geochemical-processes-related-to-mined-milled-or-natural-metal-deposits补充材料:https://doi.org/10.6084/m9.figshare.c.6370671

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来源期刊

Geochemistry-Exploration Environment Analysis 地学-地球化学与地球物理

CiteScore

3.60

自引率

16.70%

发文量

审稿时长

1 months

期刊介绍： Geochemistry: Exploration, Environment, Analysis (GEEA) is a co-owned journal of the Geological Society of London and the Association of Applied Geochemists (AAG). GEEA focuses on mineral exploration using geochemistry; related fields also covered include geoanalysis, the development of methods and techniques used to analyse geochemical materials such as rocks, soils, sediments, waters and vegetation, and environmental issues associated with mining and source apportionment. GEEA is well-known for its thematic sets on hot topics and regularly publishes papers from the biennial International Applied Geochemistry Symposium (IAGS). Papers that seek to integrate geological, geochemical and geophysical methods of exploration are particularly welcome, as are those that concern geochemical mapping and those that comprise case histories. Given the many links between exploration and environmental geochemistry, the journal encourages the exchange of concepts and data; in particular, to differentiate various sources of elements. GEEA publishes research articles; discussion papers; book reviews; editorial content and thematic sets.