加拿大不列颠哥伦比亚Rock Canyon Creek REE-F-Ba矿床地球化学的矿物控制

IF 1 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Geochemistry-Exploration Environment Analysis Pub Date : 2021-02-15 DOI:10.1144/geochem2020-010

G. Simandl, S. Paradis, Johnathan Savard, D. Miller, R. D'Souza, D. Araoka, C. Akam, M. Hoshino, Y. Kon

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引用次数: 1

摘要

Rock Canyon Creek碳酸盐岩型REE-F-Ba矿床在构造、地层和结构上与落基山脉东南部的密西西比河谷型和亮镁矿矿床相似。主要的REE萤石带是一个陡峭的倾斜体，延伸1100 沿走向m，50 m宽，100 m深。它在空间上与碳酸盐岩中预先存在的裂纹角砾岩一致，由白云石、萤石、重晶石、黄铁矿、石英、钾长石、方解石、多孔磷灰石、REE氟碳酸盐和REE磷酸盐组成。含氟碳酸盐岩主要有氟碳铈矿、绿柱石和正长辉石。独居石、裂隙岩组矿物和磷灰石是主要的磷酸盐。萤石含量从小于1%到13.5%不等（按重量计），∑REE + Y的浓度从微量到1.95%（按重量计）不等。矿化带在矿床规模上是不均匀的，如三维地球化学建模和基于89个矿化样品的地球化学评估以及关键钻孔的详细井下矿物和地球化学剖面所示。强烈的矿物学控制解释了化学不均匀性和关键元素共变异，并对该类型矿床的勘探和开发计划的设计产生了影响。矿化带样品的球粒陨石归一化REE模式显示LREE富集，类似于典型的碳酸盐岩相关矿化；但附近无碳酸盐岩出露。

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Mineral control on the geochemistry of the Rock Canyon Creek REE-F-Ba deposit, British Columbia, Canada

The Rock Canyon Creek carbonate-hosted REE-F-Ba deposit has tectonic, stratigraphic and structural similarities with Mississippi Valley-type and sparry magnesite deposits in the SE Rocky Mountains. The main REE-fluorite zone is a steeply dipping body, extending 1100 m along-strike, 50 m wide and 100 m deep. It spatially coincides with pre-existing crackle breccias in carbonate rocks, and consists of dolomite, fluorite, barite, pyrite, quartz, K-feldspar, calcite, porous apatite, REE-fluorocarbonates and REE-phosphates. The main fluorocarbonates are bastnaesite, parisite and synchysite. Monazite, crandallite group minerals and apatite are the main phosphates. Fluorite content varies from less than 1 to 13.5% (by weight) and ∑REE + Y concentrations vary from trace to 1.95% (by weight). The mineralized zone is heterogeneous on the deposit scale, as indicated by three-dimensional geochemical modelling combined with a geochemical assessment based on 89 mineralized samples and detailed downhole mineral and geochemical profiles of a key borehole. Chemical heterogeneity and key elemental co-variations are explained by strong mineralogical control and have implications for the design of exploration and development programmes for this type of deposit. The chondrite-normalized REE pattern of samples from the mineralized zone shows enrichment in LREE, similar to typical carbonatite-related mineralization; however, no carbonatite is exposed nearby.

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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.