Genesis of the low sulfide-high-grade PGE mineralization in the W Horizon, Coldwell Complex, Canada: quantitative modeling for PGE reef-style mineralization in syn-magmatic sills
发布时间：2021-12-17
点击次数：
影响因子：5.109
发表刊物：Mineralium Deposita
关键字：Midcontinent Rift . Coldwell Complex . Syn-magmatic sill . PGEmineralization . Marathon deposit
摘要：The W Horizon is a thin continuous zone of low sulfide-high-grade platinum group element (PGE) mineralization in the Two Duck Lake gabbro at theMarathon Cu-PGE deposit, Coldwell Complex, Canada, that resembles reef-type PGE deposits found in much larger intrusions. The Marathon deposit was previously shown to have grown by accretion of syn-magmatic, sulfide- bearing sill-like intrusions that formed each of the W Horizon, Main Zone, and Lower Zone mineralization. Each zone can be distinguished by features such as sulfide mineral or platinum group mineral assemblages, or by Cu/Pd, Pd/Se, and Pd/Au values. For example, the WHorizon is defined by the presence ofbornite, very high PGE values, low Cu/Pd (< 1000), and high Pd/Au (34 ± 32), whereas the Main Zone and Lower Zone types are characterized by mantle-like Cu/Pd (1000 to 10,000), and Pd/Au of 10.3 ± 4.7. Model calculations based onKerr-Leitch multistage dissolution upgrading show that PGE enrichment and decoupling ofPGE from Au and chalcophile elements in the W Horizon can be related to progressive upgrading and recycling of sulfide liquid by successive pulses ofsilicate magma. For the WHorizon, extreme PGE enrichment can be explained by the interaction ofa sulfide liquid with up to 25 pulses ofmagma and simultaneous sulfide liquid dissolution resulting in a loss of> 95% ofthe original sulfide liquid. In some samples, metal and S abundances indicate that PGEwere transported as TABS-PGE phases. This work describes an example of thin PGE-rich sill-like injections that could be ofimportance to PGE exploration elsewhere.
合写作者：Iain Samson, Robert Linnen, David Good
第一作者：Yonghua Cao
论文类型：期刊论文
学科门类：理学
一级学科：地质学
文献类型：J
卷号：56
期号：6
页面范围：1151-1176
是否译文：否
发表时间：2021-01-05
收录刊物：SCI
发布期刊链接：https://doi.org/10.1007/s00126-020-01033-0
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