Hydrogeochemistry of porphyry-related solutes in ground and surface waters; an example from the Casino Cu–Au–Mo deposit, Yukon, Canada

IF 1 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Geochemistry-Exploration Environment Analysis Pub Date : 2022-01-10 DOI:10.1144/geochem2021-058

J. Kidder, M. McClenaghan, M. Leybourne, M. McCurdy, P. Pelchat, D. Layton-Matthews, A. Voinot

{"title":"Hydrogeochemistry of porphyry-related solutes in ground and surface waters; an example from the Casino Cu–Au–Mo deposit, Yukon, Canada","authors":"J. Kidder, M. McClenaghan, M. Leybourne, M. McCurdy, P. Pelchat, D. Layton-Matthews, A. Voinot","doi":"10.1144/geochem2021-058","DOIUrl":null,"url":null,"abstract":"The Casino Cu–Au–Mo deposit is one of the largest and highest-grade porphyries of its kind in Canada, residing in an unglaciated region of west-central Yukon. A batch of 22 stream water samples and eight groundwater samples were collected proximal to the deposit for the purpose of identifying the most diagnostic trace element and isotopic pathfinders associated with the hydrothermal mineralization, as well as establishing natural hydrogeochemical baselines for the area. Water chemistry around this deposit was investigated because: (i) the deposit has not yet been disturbed by mining; (ii) the deposit was known to have metal-rich waters in local streams; and (iii) the deposit has atypically preserved ore zones. Surface and ground waters around the Casino deposit are anomalous with respect to Cd (up to 5.4 µg l–1), Co (up to 64 µg l–1), Cu (up to 1657 µg l–1), Mo (up to 25 µg l–1), As (up to 17 µg l–1), Re (up to 0.7 µg l–1) and Zn (up to 354 µg l–1) concentrations. Sulfur and Sr isotopes are consistent with proximal waters interacting with the Casino rocks and mineralization; a sulfide-rich bedrock sample from the deposit has δ34S = −1.2‰ and proximal groundwaters are only slightly heavier (−0.3 to 3.1‰). These geochemical and isotopic results indicate interaction and dispersion of porphyry-related solutes in ground and surface waters and point to the suitability of hydrogeochemistry as a medium for mineral exploration for porphyry-style mineralization in the Yukon, and elsewhere in Canada. Supplementary material: Dissolved concentration data for major and trace elements for the ground and stream water samples from Casino are available at https://doi.org/10.6084/m9.figshare.c.5778911 Thematic collection: This article is part of the Hydrochemistry related to exploration and environmental issues collection available at: https://www.lyellcollection.org/cc/hydrochemistry-related-to-exploration-and-environmental-issues","PeriodicalId":55114,"journal":{"name":"Geochemistry-Exploration Environment Analysis","volume":" ","pages":""},"PeriodicalIF":1.0000,"publicationDate":"2022-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Geochemistry-Exploration Environment Analysis","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1144/geochem2021-058","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"GEOCHEMISTRY & GEOPHYSICS","Score":null,"Total":0}

引用次数: 2

Abstract

The Casino Cu–Au–Mo deposit is one of the largest and highest-grade porphyries of its kind in Canada, residing in an unglaciated region of west-central Yukon. A batch of 22 stream water samples and eight groundwater samples were collected proximal to the deposit for the purpose of identifying the most diagnostic trace element and isotopic pathfinders associated with the hydrothermal mineralization, as well as establishing natural hydrogeochemical baselines for the area. Water chemistry around this deposit was investigated because: (i) the deposit has not yet been disturbed by mining; (ii) the deposit was known to have metal-rich waters in local streams; and (iii) the deposit has atypically preserved ore zones. Surface and ground waters around the Casino deposit are anomalous with respect to Cd (up to 5.4 µg l–1), Co (up to 64 µg l–1), Cu (up to 1657 µg l–1), Mo (up to 25 µg l–1), As (up to 17 µg l–1), Re (up to 0.7 µg l–1) and Zn (up to 354 µg l–1) concentrations. Sulfur and Sr isotopes are consistent with proximal waters interacting with the Casino rocks and mineralization; a sulfide-rich bedrock sample from the deposit has δ34S = −1.2‰ and proximal groundwaters are only slightly heavier (−0.3 to 3.1‰). These geochemical and isotopic results indicate interaction and dispersion of porphyry-related solutes in ground and surface waters and point to the suitability of hydrogeochemistry as a medium for mineral exploration for porphyry-style mineralization in the Yukon, and elsewhere in Canada. Supplementary material: Dissolved concentration data for major and trace elements for the ground and stream water samples from Casino are available at https://doi.org/10.6084/m9.figshare.c.5778911 Thematic collection: This article is part of the Hydrochemistry related to exploration and environmental issues collection available at: https://www.lyellcollection.org/cc/hydrochemistry-related-to-exploration-and-environmental-issues

查看原文本刊更多论文

地下水和地表水中斑岩相关溶质的水文地球化学研究以加拿大育空地区的卡西诺铜金钼矿为例

卡西诺铜金钼矿是加拿大同类中最大、品位最高的斑岩之一，位于育空中西部的无冰川地区。在矿床附近采集了22个水样和8个地下水样品，以确定与热液成矿有关的最具诊断意义的微量元素和同位素探路者，并建立了该地区的天然水文地球化学基线。对该矿床周围的水化学进行了调查，因为:(1)该矿床尚未受到采矿的干扰;(ii)已知该矿床在本地溪流中有富金属的水;(三)矿床具有典型的保存矿带。Casino矿床周围的地表水和地下水在Cd(高达5.4µg l-1)、Co(高达64µg l-1)、Cu(高达1657µg l-1)、Mo(高达25µg l-1)、As(高达17µg l-1)、Re(高达0.7µg l-1)和Zn(高达354µg l-1)浓度方面都是异常的。硫、锶同位素与近端水体与卡西诺岩体相互作用及成矿作用一致;富硫化物基岩样品δ34S =−1.2‰，近端地下水仅略重(−0.3 ~ 3.1‰)。这些地球化学和同位素结果表明，与斑岩有关的溶质在地下水和地表水中相互作用和分散，并指出水文地球化学适合作为育空地区和加拿大其他地区斑岩型矿化的矿物勘探媒介。补充资料:卡西诺地表水和溪流样品中主要元素和微量元素的溶解浓度数据可在https://doi.org/10.6084/m9.figshare.c.5778911上获得主题集:这篇文章是与勘探和环境问题相关的水化学集的一部分，可在https://www.lyellcollection.org/cc/hydrochemistry-related-to-exploration-and-environmental-issues上获得

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

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.