What make the mafic volcanics of bulyanhulu to have significant gold mineralization while not in felsic volcanics?
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The significant gold mineralization in mafic volcanics of Bulyanhulu compared to felsic volcanics can be attributed to various factors observed in different studies. In the Bulyanhulu region, the mafic magma's addition enriched in Cu may contribute to ore-forming elements, enhancing mineralization potential in coeval felsic rocks . Additionally, the presence of gold alloys formed through silicate-metal liquid immiscibility in iron oxide deposits indicates a possible link to explosive volcanism, suggesting a precursor for high-grade epithermal gold mineralization . Furthermore, the interaction of hydrothermal aureoles with highly permeable volcanic rocks, such as dacites and pyroclastic rocks, in other regions has led to voluminous alteration zones with potential precious metal enrichments, highlighting the importance of specific rock types in gold mineralization .
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