Update Artikelilmiah: 19896

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Abstrak (Bhs. Indonesia)

Daerah penelitian berada di Desa Banjarejo dan sekitarnya, kecamatan Tanjungsari, kabupaten Gunungkidul, provinsi  Yogyakarta, dengan koordinat 449000mE – 456000mE dan 910000mN – 9108000mN. Memiliki luas penelitian 72 km2 (8x9 km).  Penelitian dilakukan untuk mengetahui tatanan geologi serta penyebaran litofasies batuan karbonat di daerah penelitian. Geomorfologi daerah penelitian terbagi menjadi 3 satuan, yaitu Perbukitan karst Tanjungsari, Dataran karst Kemadang, serta Lembah Karst Baron. Berdasarkan pengamatan secara megaskopis, satuan batuan di daerah penelitian dibagi menjadi satuan batugamping bioklastik, dan satuan batugamping klastik fragmenter yang terendapkan secara menjari pada kala Miosen Tengah – Miosen akhir pada batimetri neritik tengah. Kajian studi khusus litofasies batuan karbonat menggunakan konsep Standard Microfasies Types (SMF) oleh Wilson (1975) menggunakan data sayatan petrografi sampel batuan serta persentase keterdapatan fosil yang terkandung di dalamnya. Berdasarkan konsep tersebut, litofasies daerah penelitian terdiri dari 3 tipe SMF, yaitu SMF 10 (bioclastic packstone/wackestone with worn skeletal grains), SMF 18 (grainstone/packstone with abundant foraminifera or algae), dan SMF 23 (Homogenous, non fosiliferous micrite).. Dari ketiga tipe SMF tersebut, didapatkan asosiasi litofasies berupa litofasies lower packstone, wackestone, upper packstone, dan mudstone. Ketiga asosiasi litofasies tersebut diinterpretasikan terendapkan pada lingkungan pengendapan zona fasies FZ 7 (open marine platform) dan FZ 8 ( Restricted platform).

Abtrak (Bhs. Inggris)

Research area is located in Banjarejo and surroundings area, Tanjungsari district, Gunungkidul regency, Yogyakarta province, by coordinate 449000mE – 456000mE and 910000mN – 9108000mN. It has 72 km2 (8x9 km) research area. This research was conducted to determine geological order and the distribution of lithofacies carbonate rocks in research area. Geomorfology of research area is divided into 3 unit, they are Tanjungsari Karst Hill, Kemadang Karst Plain, and Baron Valley of Karst.  Based on megascopic observation, geological unit of rocks in research area is divided into bioclastic limestones, and clastical fragmenter limestone that is deposited in Middle Miocen  – Late Miocen time on middle neritic zone. Specific study of lithofacies carbonate rockss employed the concept of Standard Microfacies Types (SMF) by Wilson (1975), using thin sections of rock sample and the percentage of fossil contained in it. Based on that concept, lithofacies of this research area consists of 3 SMF type, they are SMF 10  (bioclastic packstone/wackestone with worn skeletal grains), SMF 18 (grainstone/packstone with abundant foraminifera or algae), dan SMF 23 (Homogenous, non fosiliferous micrite). From those 3 SMF type, it is known that lithofacies association of the research area consists of lower packstone, wackestone, upper packstone, and mudstone lithofacies. Those 4 litofacies association is being interpreted deposited in FZ 7 (open marine platform) and FZ 8 ( Restricted platform).

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