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GEO3BCN&UB Seminars | Regional to nanoscale ore deposit metallogeny 

Sep 10 2024

Regional to nanoscale ore deposit metallogeny

This seminar is organized by Geosciences Barcelona & the Faculty of Earth Sciences of the University of Barcelona in collaboration with the Geosciences CSIC-Hub.

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Abstract

The potential endowment of metals in continental crust is enormous, with a large proportion of their resources confined in a variety of ore deposits hosted in either (peri)-cratonic and convergent margins, clustered in either provinces or metallogenic belts. In these settings, several types of ore deposits enriched in precious metals, with a wide range of sizes, usually develop in different restricted epochs. It is currently debated whether a given metal deposits has a unique mode of formation, or it represent a case within a spectrum of mineralization style, formed by an optimum convergence of common geological processes. The traditional notion of metal endowment in a given metallogenic province is that metal accumulated by highly efficient magmatic-hydrothermal enrichment processes operating in a chemically “average” crust. However, many recent frontline studies suggest that metal endowment requires the possible existence of anomalously enriched sources and/or magmas. It is now under debate whether these metal-rich reservoirs exist in the mantle, the mantle-crust transition or the crust. In this scenario, our research efforts must be tailored to determine the fundamental regional to nanoscale factors that control metal transfer from a deep mantle or lower crustal source to the shallow crust where the ore deposits accessible to mining are found. In this communication I will provide key evidence about how metals are transferred from the lower shallowest domains of the continental lithosphere where metal-rich magmas parental of magmatic-hydrothermal deposits are formed. This unprecedented information on the source, distribution and enrichment mechanisms of metals is a valuable tools allowing more efficient exploration and beneficiation metals.

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