Petrography And Field Study Of Andesitic Ignimbrite In Temangan, Kelantan

Nur Shafiqah Shahman, Department of Geoscience, Universiti Teknologi PETRONAS (UTP),32610, Seri Iskandar, Perak, Malaysia, Elvaene James, Arham Muchtar Achmad Bahar, Muhammad Irfan Hadhi, Norazif Anuar, Faculty of Earth Science, Universiti Malaysia Kelantan Kampus Jeli, Locked Bag 100, 17600 Jeli, Kelantan, Malaysia, Faculty of Earth Science, Universiti Malaysia Kelantan Kampus Jeli, Locked Bag 100, 17600 Jeli, Kelantan, Malaysia, Faculty of Earth Science, Universiti Malaysia Kelantan Kampus Jeli, Locked Bag 100, 17600 Jeli, Kelantan, Malaysia, Department of Geoscience, Universiti Teknologi PETRONAS (UTP),32610, Seri Iskandar, Perak, Malaysia
2021 Bulletin of the Geological Society of Malaysia  
The volcanic rocks in Temangan, Kelantan consist of felsic to intermediate volcanic rocks, that is mainly of pyroclastic with rhyolitic, dacitic, and andesitic tuff. A geological review has been carried out in Kampung Bukit Besi, Temangan, in Kelantan, Malaysia, which is composed of schist, shale, andesite, and ignimbrite. In Temangan, andesite and ignimbrite show an intimate relationship, as the ignimbrite exists as the fragments and andesite as the matrix. The methodology used in this study
more » ... e petrography and X-ray Diffraction (XRD) analyses, to determine the mineralogical composition of andesitic ignimbrite. Andesite shows aphenitic and porphyritic textures and consist of pyroxene, plagioclase, alkali feldspar, quartz, biotite and iron oxides. A range of plagioclase textures indicate imperfect equilibrium condition from andesite, reflecting plagioclase dissolution and regrowth. The structural analysis suggest that thrust fault occurred in the study area. Andesite and ignimbrite of the two stages are suggested to have derived from the andesite magma eruption which produced pyroclastic flow eruptions in small amount in most caldera volcanoes at high temperature gradient.
doi:10.7186/bgsm72202118 fatcat:ivtkqz5tbjd7nb6wptb4lhzsxq