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All Journal Bulletin of Scientific Contribution : Geology Journal of Geosciences and Applied Geology
Adjat Sudradjat
Fakultas Teknik Geologi Universitas Padjadjaran
Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Engineering Environmental Science

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KARAKTERISTIK GEOMORFOLOGI GUNUNG API AKTIF DAN GUNUNG API PADAM: KASUS G. MERAPI & G. GAJAHMUNGKUR, DAERAH ISTIMEWA YOGYAKARTA DAN JAWA TENGAH Hill G. Hartono; Adjat Sudradjat
Bulletin of Scientific Contribution: GEOLOGY Vol 16, No 2 (2018): Bulletin of Scientific Contribution GEOLOGY
Publisher : Fakultas Teknik Geologi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1181.215 KB) | DOI: 10.24198/bsc geology.v16i2.18383

Abstract

The volcanic morphology provides the information about the history of the genesis and activities of an active volcano which is still developing as demonstrated by Merapi strato volcano in Special Provinve of Yogyakarta and Central Java. The purpose of the present study is to reveal the history of the geomorphology of the dormant volcano (such as Gajahmungkur volcano, Wonogiri) based on the comparative study of the active volcano (Merapi volcano, Yogyakarta). The method in this study is the application of geological principle “the present is the key to the past” in the geology of a volcano. In general the volcanological facies concept reflects the ideal morphology of Merapi volcano. The central facies with the slope of 300 to 400 and the smooth surface; medial facies with the slope of 200 to 300 reflecting rough surface and the distal facies manifested in a relatively flat angle between 100 to 200 where the deposition of volcanic materials and lahar takes place. The boundary between the facies is delineated by a break in slope which also reflects the radial drainage pattern and the boundary of vegetation
THE SALT POTENTIALS IN INDONESIA Emi Sukiyah; Vijaya Isnaniawardhani; Adjat Sudradjat; Faisal Muhamadsyah
Journal of Geological Sciences and Applied Geology Vol 2, No 1 (2017): Journal of Geological Sciences and Applied Geology
Publisher : Faculty of Geological Engineering, Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/gsag.v2i1.13419

Abstract

Abstract The salt deposits are unevenly distributed in the world. The most productive countries are China, USA and India. Indonesia experiences the salt deficit, due to the limited number of the deposits. The evaluation of the characteristics of salt deposit in the world reveals the Pre Tertiary association in semi closed marine environmental deposition. The geological condition in Indonesia does not favor such environment, therefore the salt deposits unlikely to occur. The saline solution in mud volcanoes in northern part of Java Island however indicates the possible saline deposits in Tertiary Kalibeng Formation with the thickness of approximatelly 3.000 meters. The saline seepages most probably have continuously been taking place since early Pleistocene or about a million years ago. The saline seepages in northern part of East Java might extend to thebottom of Madura Strait and enrich the salinity of the sea in the strait. The semi closed configuration of the strait contributes to the accumulation of salt. It is therefore suggested to expand the evaporating pools for salt production, among others by the reclamation of the shallow offshore area in the southern part of the island. Keywords: salt deficit, mud volcano, saline solution, enrich the salinity, solar evaporating pools
Co-Authors Emi Sukiyah Faisal Muhamadsyah Hill G. Hartono Vijaya Isnaniawardhani