Studi Alterasi Hidrotermal dan Mineralisasi Batuan di Sekitar Mata Air Panas Garara Bukit Kili, Kabupaten Solok, Sumatera Barat
DOI:
https://doi.org/10.25077/jfu.7.3.246-252.2018Abstract
Telah dilakukan penelitian mengenai studi alterasi hidrotermal dan mineralisasi pada batuan di sekitar mata air panas Garara (Bukit Kili), Kabupaten Solok, Sumatera Barat. Sampel batuan diambil pada tiga daerah stratigrafi penyusun daerah Bukit Kili, yaitu Lahar Bukit Bakar (Qulh), Lahar Gunung Talang (QTlh), dan Vulkanik Tua (TTI). Penentuan mineral alterasi yang terbentuk dilakukan dengan melakukan karakterisasi menggunakan X-ray Fluorescence (XRF), X-ray Diffractometer (XRD), dan Scanning Electron Microscopy (SEM). Hasil XRF menunjukkan bahwa batuan pada daerah penelitian merupakan batuan yang terbentuk dari aktivitas magma andesit yang berkaitan dengan zona subduksi pada pinggiran benua aktif dan dikontrol oleh aliran gas pada proses pengkayaan magma. Hasil XRD memperlihatkan adanya mineral albit, kristobalit, tridimit dan diopsid, tipe alterasi yang terbentuk pada daerah penelitian adalah tipe propilitik, dan silifikasi. Mikrotekstur pada batuan Lahar Gunung Talang (QTlh) memiliki tekstur bulat, kubus, dan prismatik yang tidak beraturan
Kata kunci: alterasi, andesit, Garara, propilitik, silifikasi, stratigrafi.
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Copyright (c) 2018 Rahmat Ravvi Qodri, Ardian Putra
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