Petrology and Geochemical Features of Semporna Volcanic Rocks, South-east Sabah, Malaysia

The volcanic rocks in Semporna Peninsula, Sabah, Malaysia forms parts of the Miocene subjected slab during Miocene-Pliocene orogeny. This study presents new petrographic and geochemical data area. range composition from basaltic andesite, dacite to rhyolite, with most shows calc-alkaline affinity a minor tholeiitic feature. trace elements enrichment large-ion lithophile (LILE) light rare earth (LREE) suggesting that have similar patterns might come magma source. petrochemical suggests characteristic subduction zone (negative Nb, Ta, Ti). Decreasing magnitude Europium anomalies intermediate acid lavas an important role plagioclase fractional crystallization. Negative Ce anomaly part suggest those may related emergence oxygenated deep-sea environment. Tectonic diagrams showed were formed island arc setting.