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

Mineral control on the geochemistry of the Rock Canyon Creek REE-F-Ba deposit, British Columbia, Canada
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加拿大不列颠哥伦比亚省 Rock Canyon Creek REE-F-Ba 矿床地球化学的矿物控制

DOI:
10.1144/geochem2020-010
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发表时间:
2021
期刊:
Geochemistry: Exploration, Environment, Analysis
影响因子:
--
通讯作者:
Kon Yoshiaki
Kon Yoshiaki
中科院分区:
--
文献类型:
--
作者:
Simandl George J.;Paradis Suzanne;Savard Johnathan;Miller Deanna;D'Souza Rameses;Araoka Daisuke;Akam Carlee;Hoshino Mihoko;Kon Yoshiaki

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岩石峡谷溪碳酸盐岩型REE-F-Ba矿床与落基山脉东南部的密西西比河谷型和亮晶菱镁矿矿床具有构造、地层和构造上的相似性。稀土萤石主带为急倾体,沿走向长1100 m,宽50 m,深100 m。在空间上与碳酸盐岩中已存在的裂纹角砾岩重合,由白云岩、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。氟碳化物主要有氟碳石、parisite和synchyite。独居石、辉长石群矿物和磷灰石是主要的磷酸盐。萤石含量从不足1%到13.5%不等(重量计),∑REE+ Y浓度从微量到1.95%不等(重量计)。三维地球化学模拟结合89个矿化样品的地球化学评价和一个关键钻孔的详细井下矿物和地球化学剖面表明,矿化带在矿床规模上具有非均质性。化学非均质性和关键元素的共同变化可以用强有力的矿物学控制来解释,并对这类矿床的勘探和开发方案的设计产生影响。矿化带样品的球粒陨石归一化稀土模式显示轻稀土富集,与典型碳酸盐岩相关矿化特征相似;然而,附近没有暴露出碳酸盐岩。
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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