STUDI FASIES GUNUNG API PURBA BERDASARKAN ANALISIS GEOMOROFOLOGI, ASOSIASI LITOLOGI, DAN STRUKTUR GEOLOGI SERTA IMPLIKASINYA (STUDI KASUS: DAERAH PRIPIH, KECAMATAN KOKAP, KABUPATEN KULON PROGO, DAERAH ISTIMEWA YOGYAKARTA)

Singkapan Intrusi Andesit Gunung Ijo Kulon Progo.

Topan Ramadhan1, Faisal Sangaji1, Nenden Lestari Sidik1

1Jurusan Teknik Geologi, Fakultas Teknologi Mineral – Institut Sains & Teknologi AKPRIND Yogyakarta

ABSTRAK
Berdasarkan kondisi suatu gunungapi purba saat ini sulit dikenali secara langsung suatu kenampakannya, seperti dalam kompleks pegunungan Kulon Progo. Berdasarkan aktivitas gunungapi menghasilkan material seperti lava, lahar, material piroklastik, dll. Selain itu proses magmatisme menghasilkan banyak potensi seperti potensi mineralisasi. Untuk identifikasi suatu gunung api purba dan fasisesnya dapat menggunakan pendekatan analisis geomorfologi, asosiasi litologi gunungapi, struktur-struktur geologi pada batuan formasi Andesit Tua (Rahardjo, dkk, 1977). Penyelidikan yang dilakukan dengan metode pemetaan geologi, analisis petrografi batuan gunungapi, analisis stratigrafi, pola struktur-struktur vulkanik, serta arus purba sehingga didapatkan hasil fasies gunungapi daerah sekitar, arah aliran purba material gunungapi. Daerah Pripih, Kecamatan Kokap, Kabupaten Kulon Progo, Daerah Istimewa Yogyakarta diidentifikasikan merupakan daerah fasies pusat hingga proksimal dari gunungapi purba, dan berdasarkan Bronto,S (2013) termasuk dalam kompleks gunung api purba Ijo. Sehingga data tersebut juga dapat berimplikasi terhadap sumberdaya geologi seperti potensi mineralisasi dan bahan galian.
Kata kunci : fasies gunungapi purba, Gunung Ijo, Kulon Progo  

Study About Environmental Geology In Framework Of Flood Disaster Mitigation As Developing Region Of Buntok, South Barito District, Central Kalimantan Province

Geomorphology of Barito River

Topan Ramadhan1,Shandy H.W1, Eka Fajar.N.S1, Nico Okto W.H1

1Geological Engineering, Faculty of Mineral Technology – Institut Sains & Teknologi AKPRIND Yogyakarta

ABSTRAK

The study area is located in the Buntok town which is administratively a capital Dusun Selatan district as well the capital of South Barito regency, Central Kalimantan Province. Flooding always being yearly problematic disaster significantly happens, this has an impact on social aspects, but particularly impact on infrastructure development problems. Geological investigations should be conducted by means of geological mapping with analysis of geomorphology and hydrology as well. Based on the investigation it was found that the Buntok town is situated by young sediment fraction predominantly fine grain. In addition, from the manual analysis of coring obtained multiple layers that show the ancient flood sediment. Geomorphological analysis shows the city area Buntok is situated in the Flood Plain landform unit on Barito drainage basin (DAS) with an average elevation of 1-2 meters above sea level. As well as on the analysis of aerial photographs shows the presence of ancient Barito river flow patterns that head to giving area. Based on a series of investigations it is known that the study area is currently included in the flood-prone area with high intensity that the relocation of the urban area to a safer area is assumedly needed.
Keyword: study environmental geology, flood disaster mitigation, buntok town, barito drainage basin