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All Journal BULLETIN OF THE MARINE GEOLOGY Journal of Engineering and Scientific Research (JESR) Jurnal Riset Fisika Indonesia
Rahmi Mulyasari
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Astronomy Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Physics

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Kajian Potensi Gua Pandan sebagai Objek Geowisata Lampung Timur Rinda Ermana; Rezky Ariya Dwiguna; Hesti Hesti; Rahmi Mulyasari
Jurnal Riset Fisika Indonesia Vol 3 No 1 (2022): Desember 2022
Publisher : Jurusan Fisika, Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/jrfi.v3i1.3639

Abstract

Indonesian tourism has developed in various sectors and regions in Indonesia. Various types of tourism have been presented in modern, traditional and rural forms. One of them is related to the development of geotourism in Indonesia. Geotourism has benefits, namely the welfare of the people who live around it, encouraging local people to participate in maintaining and developing geotourism, realizing sustainable tourism development, giving a distinct impression and experience for every tourist who comes. Pandan Cave is one of the geosites in Giri Mulyo, East Lampung. The Pandan Cave area is included in the Sukadana Lava lithology unit (Qbs). Pandan Cave in geomorphological studies includes structural landforms formed as a result of endogenous processes, in the form of lifting, folding, and faulting. This endogenous force is constructive. Pandan Cave has geotourism potential because of its unique geology, the various rock forms that make up Pandan Cave and its morphology are interesting things for tourists to study geology. In addition, the location of Pandan Cave which is in the plantation of residents close to the village, makes this tourist attraction an interesting place to visit.
GEOLOGICAL INTERPRETATION OF THE OFFSHORE SEDIMENTARY BASIN OF NORTH CENTRAL JAVA BASED ON SPECTRAL ANALYSIS AND 2D GRAVITY MODELING Restu Ningsih; Imam Setiadi; Riza Rahardiawan; Ordas Dewanto; Rahmi Mulyasari
BULLETIN OF THE MARINE GEOLOGY Vol 37, No 2 (2022)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/bomg.37.2.2022.788

Abstract

The offshore sedimentary basin of North Central Java is a marine basin located in the northern part of North Serayu Basin. This basin was formed through the uplift of the southern part of Central Java (Bumiayu) caused by the movement of a pair of horizontal faults. Studies of sub-basin delineation and basement configuration are rarely carried out in this basin. Therefore, the gravity method referring to subsurface-density variations was carried out to obtain this information. This research aims to delineate sedimentary basins and interpret the geological subsurface based on gravity data using spectral analysis, highpass and lowpass filters, also 2D gravity modeling. An average estimation depth to the basement in the study area of about 2.22 km was determined using spectral analysis. Qualitative analysis shows the basement-high pattern, sub-basin, and structure lineament patterns. The 2D model shows three layers consisting of the upper sedimentary layer of Tertiary-Neogene and the middle layer of Tertiary-Paleogene sediment with a density value of 2.3 gr/cc and 2.5 gr/cc, respectively. The lower layer has the highest density of 2.67 gr/cc, assumed as a granitic basement. The results of the Second Vertical Derivative (SVD) analysis on the residual anomaly cross-sectional paths indicate the presence of thrust and normal faults which can be used to assist the interpretation of fault structures in subsurface geological models. Gravity analysis of the offshore North Central Java sedimentary basin indicates the occurrence of sub-basins and geological structure patterns that considered as a potential zone for the development of the petroleum system in this area.
The Initiation Study on the Gold Potential Resources at West Coast Area in Lampung Province, Indonesia Akroma Hidayatika; Suharno; Rahmi Mulyasari; Hesti; Idabagus S Yogi; Arif P Prabowo; Syamsurijal Rasimeng
Journal of Engineering and Scientific Research Vol. 4 No. 1 (2022)
Publisher : Faculty of Engineering, Universitas Lampung Jl. Soemantri Brojonegoro No.1 Bandar Lampung, Indonesia 35141

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (464.216 KB) | DOI: 10.23960/jesr.v4i1.97

Abstract

Gold mineral (Au) is formed due to an increase in the residual solution of magma deposited at high temperature and pressure. This study aims to estimate the potential of gold minerals in the west coast area in Lampung Province. This initiation study was using a geophysical resistivity model. Based on geological data, gold minerals in the West Coast are classified as epithermal hydrothermal deposits in the form of low sulfide quartz veins. The results of the subsurface interpretation were identified as a gold mineralization zone associated with the rock in the form of volcanic rock which has a resistivity value of 400?.m. The source rock volume has been estimated at 130,000 m3 and ?133,000 m3. So that the Au mineral content in the study area is estimated at 0.5-2.09 tons. A future study should be conducted in relation to the development of gold mining industry in Lampung West Coast area, that may integrate more engineering experts.
Co-Authors Akroma Hidayatika Arif P Prabowo Hesti Hesti Hesti Idabagus S Yogi Imam Setiadi Ordas Dewanto Restu Ningsih Rezky Ariya Dwiguna Rinda Ermana Riza Rahardiawan Suharno Syamsurijal Rasimeng