Identifikasi Erupsi Vulkanik menggunakan Vulkanostratigrafi pada Formasi Semilir Studi Kasus Desa Srimulyo, Kecamatan Piyungan, Kabupaten Bantul, Provinsi Daerah Istimewa Yogyakarta

Abstrak

In Java, volcaniclastic rocks and thick volcaniclastic sequences were produced by volcanic activity that has occurred since the Eocene. The study conducted at the Srimulyo volcaniclastic rock outcrop, Piyungan, Bantul, Yogyakarta, enabled the identification of geometric and architectural elements of the rock structure, depositional system, and environment. This study quantifies the distribution and variation of lithofacies, sedimentation dynamics, rock properties, and rock origin using stratigraphic measurements and petrographic analysis. The study area consists of 6 facies of volcaniclastic rocks that have stratigraphic relationships with siliciclastic and mixed siliciclastic rocks. In addition, the results show that the study area experienced two periods of explosive eruptions of the Plinian eruption type, which produced primary and secondary pyroclastic flows.