The volcanic rocks of the Chae Hom area in Lampang, northern Thailand were investigated. Petrographic and
geochemical analyses were performed to comprehend the alterations. The volcanic rocks in this study were co-magmatic and
chemically transitional rhyolite to trachyandesite with calc-alkalic affinity. Their colors were highly variable due to two main
alteration processes that included silicification and sericitization. The silicification process yields abundant quartz, whereas the
sericitization yields abundant sericite and clay minerals. The sericite and clay minerals are most likely to be illite. The silicafication
process occurred after the sericitization process. Based on our petrochemical analysis, the Chae Hom volcanic rocks are
considered to be of calc-alkaline affinity and post-collisional magmatic suite.
Keywords
Chae Hom volcanics, transitional rhyolite to trachyandesite, calc-alkalic rocks, silicification, sericitization, illite
SONGKLANAKARIN JOURNAL OF SCIENCE & TECHNOLOGY
Published by : Prince of Songkla University Contributions welcome at : http://rdo.psu.ac.th
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