Identifikasi Karakteristik Batuan Berdasarkan Analisis Petrografi dan Petrologi pada Daerah Lengkiti dan Sekitarnya, Kabupaten Ogan Komering Ulu Selatan, Provinsi Sumatera Selatan
DOI:
https://doi.org/10.58812/jgws.v4i03.3668Kata Kunci:
Litologi, Petrografi, Stratigrafi, Sejarah Geologi, Sumatra SelatanAbstrak
Daerah penelitian tersusun oleh lima satuan batuan yang merekam perkembangan geologi sejak Paleogen hingga Muda, yaitu Satuan Andesit, Satuan Batupasir, Satuan Batugamping, Satuan Batupasir Gampingan, dan Satuan Breksi. Penelitian ini bertujuan untuk mengidentifikasi karakteristik litologi dan petrografi batuan serta menginterpretasikan sejarah geologi daerah penelitian berdasarkan hubungan stratigrafi dan karakter batuan penyusunnya. Metode penelitian meliputi pemetaan geologi lapangan, analisis megaskopis, analisis petrografi sayatan tipis, dan studi literatur regional. Hasil penelitian menunjukkan bahwa daerah penelitian mengalami evolusi geologi yang diawali oleh aktivitas vulkanisme Paleogen yang menghasilkan andesit Formasi Kikim, diikuti sedimentasi silisiklastik Formasi Talang Akar, perkembangan platform karbonat Formasi Baturaja, sedimentasi campuran karbonat-silisiklastik Formasi Gumai, serta aktivitas vulkanisme muda yang menghasilkan breksi vulkanik. Urutan tersebut menunjukkan perubahan lingkungan geologi dari daratan vulkanik menuju lingkungan laut dangkal karbonatan dan kembali dipengaruhi oleh aktivitas vulkanik pada kala yang lebih muda.
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