磁铁矿作为斑岩铜勘探指示矿物的评价——以加拿大育空Casino斑岩铜-金-钼矿床的基岩和溪流沉积物为例

IF 1 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Geochemistry-Exploration Environment Analysis Pub Date : 2022-03-17 DOI:10.1144/geochem2021-072

M. McCurdy, J. Peter, M. Beth McClenaghan, M. Gadd, D. Layton-Matthews, M. Leybourne, R. Garrett, D. Petts, S. Jackson, Scott Casselman

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引用次数: 2

摘要

将育空中西部Casino高级斑岩Cu–Au–Mo矿床周围六条当地溪流中回收的碎屑磁铁矿颗粒的微量元素组成与矿床矿化和未矿化主岩中回收的火成岩和岩浆热液磁铁矿进行了比较。12种元素（Mg、Al、Ti、V、Mn、Co、Cr、Ni、Cu、Zn、Ga和Ge）的线性判别分析和Ti V.Ni/Cr图用于区分钾质蚀变带的岩浆热液磁铁矿和矿床所在的花岗闪长岩和石英二长岩的火成磁铁矿。在排出矿床的溪流沉积物中可识别出微量元素组成与Casino钾蚀变带相似的岩浆热液磁铁矿。岩浆热液磁铁矿中的铜，以黄铜矿等硫化物矿物的微小包裹体形式存在，或在磁铁矿晶格中被取代，是铜矿化的有力指标。我们表明，从河流沉积物中回收的磁铁矿的化学成分可以用于勘探斑岩系统。专题汇编：本文是地球化学数据分析创新应用汇编的一部分，可在以下网站获取：https://www.lyellcollection.org/cc/applications-of-innovations-in-geochemical-data-analysis补充材料：Casino基岩和河流沉积物样品中磁铁矿中主要、次要和微量元素的激光烧蚀数据可在https://doi.org/10.6084/m9.figshare.c.5896900

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Evaluation of magnetite as an indicator mineral for porphyry Cu exploration: a case study using bedrock and stream sediments at the Casino porphyry Cu–Au–Mo deposit, Yukon, Canada

The trace element composition of detrital magnetite grains recovered from six local streams around the Casino high-grade porphyry Cu–Au–Mo deposit, west-central Yukon, is compared with igneous and magmatic-hydrothermal magnetite recovered from mineralized and unmineralized host rocks at the deposit. Linear discriminant analysis of 12 elements (Mg, Al, Ti, V, Mn, Co, Cr, Ni, Cu, Zn, Ga and Ge) and plots of Ti v. Ni/Cr are used to discriminate between magmatic-hydrothermal magnetite from the potassic alteration zone and igneous magnetite from granodiorite and quartz monzonite hosting the deposit. Magmatic-hydrothermal magnetite with a trace element composition similar to that from the potassic alteration zone at Casino is identifiable in stream sediments draining the deposit. Copper in magmatic-hydrothermal magnetite, present as minute inclusions of sulfide minerals such as chalcopyrite or substituted within the magnetite crystal lattice, is a strong indicator of Cu mineralization. We show that the chemical compositions of magnetite recovered from stream sediments can be used to explore for porphyry systems. Thematic collection: This article is part of the Applications of Innovations in Geochemical Data Analysis collection available at: https://www.lyellcollection.org/cc/applications-of-innovations-in-geochemical-data-analysis Supplementary material: Laser ablation data for major, minor and trace elements in magnetite from bedrock and stream sediment samples from Casino are available at https://doi.org/10.6084/m9.figshare.c.5896900

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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.