Update Artikelilmiah: 19824

MUHAMMAD EVAL JUNI WIJAYA

NIM

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Abstrak (Bhs. Indonesia)

Studi penyebaran litofasies batugamping formasi wonosari ini berada di daerah
Jerukwudel dan sekitarnya, Kecamatan Girisubo, Kabupaten Gunung Kidul, Provinsi
D.I. Yogyakarta. Studi ini menggunakan metode analisis petrografi sayatan tipis
batugamping untuk mengetahui mikrofasiesnya dengan mengacu kepada standard
microfacies types (SMF) menurut Wilson (1975). Satuan geomorfologi daerah
penelitian terdiri dari Satuan Dataran Karst Sumberagung, Satuan Lembah Kering
Karst Girisubo dan Satuan Perbukitan Kerucut Karst Jerukwudel. Satuan geologi
daerah penelitian terdiri dari Satuan Batugamping Bioklastik dan Satuan
Batugamping Fragmental yang diindikasikan terbentuk pada miosen akhir.
Lingkungan pengendapan kedua satuan ini berada pada lingkungan restricted-marine
- open-marine dan saling menjemari. Mikrofasies batugamping di daerah penelitian
terdiri dari SMF 10 : Bioclastic packstones and grainstones with coated and abraded
skeletal grains, SMF 18 : Bioclastic grainstones or packstones with abundant benthic
foraminifera or calcareous green algae dan SMF 23 : Non-laminated homogeneous
micrite and microsparite without fossils. Mikrofasies ini diinterpretasikan
terendapkan pada Facies Zones (FZ) 8 : Restricted-marine platform (Platform
interior-restricted/lagoon) dan Facies Zones (FZ) 7 : Open-marine platform
(Platform interior-normal marine). Asosiasi litofasies batugamping di daerah
penelitian terdiri dari litofasies Packestone, litofasies Wackestone, litofasies Lower
Mudstone, litofasies Packestone-Grainstone dan litofasies Upper Mudstone.

Abtrak (Bhs. Inggris)

Study of limestone lithofacies distribution at Wonosari Formation in Jerukwudel Area and the surrounding, Girisubo District, Gunung Kidul Regency, Special Region of Yogyakarta Province. This study using petrographic analysis method of limestone thin section to determine the microfacies by referring to standard microfacies types (SMF) by Wilson (1975). Geomorphology unit of research area consists of Karst Plain Unit of Sumberagung, Karst Dry Valleys Unit of Girisubo and Karst Cone Hills Unit of Jerukwudel. Geological unit of research area consists of bioclastic limestone unit and fragmental limestones unit formed in late Miocene. Depositional environments of these two units are in restricted marine environment - open-marine environment and interfingering each other. Limestones microfacies in the research area consist of SMF 10 (Bioclastic packstones and grainstones with coated and abraded skeletal grains), SMF 18 (Bioclastic grainstones or packstones with abundant benthic foraminifera or calcareous green algae) and SMF 23 (Non-laminated homogeneous micrite and microsparite without fossils). These facies interpreted deposited on Facies Zones (FZ) 8 : Restricted-marine platform (Platform interior-restricted/lagoon) and Facies Zones (FZ) 7 : Open-marine platform FZ 7 (Platform interior - normal marine). Limestones lithofacies association of research area limestones Packestone lithofacies, Wackestone lithofacies, Lower Mudstone lithofacies, Packestone-Grainstone lithofacies and Upper Mudstone lithofacies.

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