5:15 PM - 6:45 PM
[SCG45-P08] Geochemical characteristics of igneous rocks in the Sangilo Deposit, Itogon, Philippines: Implications for Ore Genesis
Keywords:Geochemistry, Baguio Mining District, Micro-XRF elemental mapping, ICP-MS
The Sangilo epithermal gold deposit in Itogon, Philippines is part of the widely known Baguio Mining District, and it is situated in an area with a complex geological terrain. Although the geochemical characteristics and origins of the igneous rocks such as diorites have been previously investigated, there is a need to further study the other igneous bodies found within the deposit. This is to understand the regional sources, tectonic settings, temporal evolutions, and magmatic processes involved in ore genesis. This research employed a comprehensive approach to analyze rock samples collected from the surface and underground workings of the Sangilo deposit. The methods used include thin-section petrographic analysis, micro-X-Ray Fluorescence elemental mapping of rock slabs, and trace element analysis using inductively coupled plasma–mass spectrometry (ICP-MS). The elemental mapping results showed other distinct compositions of igneous rocks including granodiorite and two different types of andesites. These compositions were also differentiated by their geochemical characteristics and were correlated with varied mineralization phases. The micro-XRF results further revealed Zr signatures in the elemental maps of the andesites which were also supported by the ICP-MS results for Zr concentrations. Additionally, the ICP-MS results highlighted the difference in concentrations between the two distinct andesites which were indicative from field notes and micro-XRF maps. These findings would contribute to the understanding of geochemical ore genesis and multi-elemental metallogenesis in the Sangilo area and Baguio Mining District which opens more paths for future exploration, mineral utilization, mining, and geochronology and geochemical research.