scholarly journals Investigation of Aquifer Zone in Tambakromo Village, Ponjong Subdistrict, Gunung Kidul Regency, Yogyakarta, Indonesia

2021 ◽  
Vol 6 (3) ◽  
pp. 216
Author(s):  
Al Hussein Flowers Rizqi ◽  
Oky Sugarbo
Keyword(s):  
Research Area ◽  
Unconfined Aquifer ◽  
Groundwater Exploration ◽  
Geological Mapping ◽  
Petrographic Analysis ◽  
Stratigraphic Correlation ◽  
Geological Conditions ◽  
Drought Disaster ◽  
Limestone Rock ◽  
Geoelectrical Resistivity

The presence of surface water is always being a primary issue in Gunung Kidul regency. An aquifer investigation would support groundwater exploration. The research area is located in Tambakromo village, Ponjong subdistrict, Gunung Kidul Regency, Daerah Istimewa Yogyakarta Province. The aim of this research is about geological and subsurface conditions based on geological data and geoelectrical resistivity methods. By resistivity value interpretation, the position, depth, and thickness of aquifer could be determined. The purpose of this research is to identification of geological conditions that supported being aquifer rock. The method in this research is used geological mapping combined with petrographic analysis. The geophysics method is used to identification of aquifer in research area. Three locations were selected to acquisition geoelectrical resistivity survey. In Grogol village, there is no aquifer based on resistivity values of more than 10000 ohmmeters (andesitic breccia). An akuifuge is interpreted there in andesitic breccia instead of the presence of aquifer. The tuffaceous is interpreted as lapillistone that contained the glass with resistivity value of 43.63 and 340.11 ohmmeters. The Garon and Sumberejo village have aquifer at depth of 50 to 80 meters with a thickness of 13 to 70 meters. The type of aquifer in both area is included an unconfined aquifer, specifically located in between the limestone rock layer and andesitic breccia. By regional stratigraphic correlation, tuffaceous lapillistone is interpreted as derived from Semilir Formation. In addition, the presence of aquifer in research area could recommend for local people and government to reduce the drought disaster.

scholarly journals Groundwater quality in Ponjong Karst, Gunungkidul Regency, Special Region of Yogyakarta

2020 ◽  
Vol 1 (1) ◽  
pp. 7-11
Author(s):  
Avellyn Shintya Sari ◽  
Sari Bahagiarti K ◽  
Suharsono Suharsono ◽  
C Prasetyadi
Keyword(s):  
Volcanic Rocks ◽  
Active Volcano ◽  
Research Area ◽  
Geological Structure ◽  
Groundwater Exploration ◽  
Geological Mapping ◽  
Karst Area ◽  
Aquifer System ◽  
Aquifer Systems ◽  
Geological Conditions

The hydrogeological condition of a region is determined by the type of lithology, morphology, and subsurface conditions where the condition is very helpful in the study of groundwater exploration. Especially when we encounter interesting geological conditions when the groundwater exploration in the karst area in which volcanic rocks are resulting from the activities of the active volcano in the past. Groundwater exploration at Ponjong area and surrounding does have its special characteristics, because it has 2 different rock characteristics where the northern part of the research area in the form of a karst area (limestone of Wonosari Formation) while the southern part is an area of ancient volcanoes with dominant volcanic rocks from Wuni Formation, As for the research on the above and subsurface research area where the research is conducted based on surface geology mapping, geoelectric data collection, and groundwater sampling. Geological mapping includes geomorphological data, stratigraphy, and geological structure. The aquifer system of the research area can be divided into two systems, inter-grain aquifer systems, and fracture aquifer systems. Overall quality groundwater in the research area is quite good. Ponjong District there are mining activities that have resulted in changes in the land use system in the area. This can cause changes in the water surplus in the area due to the changing catchment area.

scholarly journals Engineering Geology of Sidosari Area, Magelang, Central Java, Indonesia

2017 ◽  
Vol 2 (1) ◽  
pp. 15
Author(s):  
Diyaning Ratri ◽  
I Gde Budi Indrawan
Keyword(s):  
Surface Engineering ◽  
Research Area ◽  
Geological Structure ◽  
Geological Mapping ◽  
Controlling Factor ◽  
Susceptibility Map ◽  
Residual Soils ◽  
Engineering Geological Mapping ◽  
Groundwater Seepage ◽  
Geological Conditions

Development of settlement area in Sidosari area and the surroundings requires complete understanding of the engineering geological conditions, including susceptibility to landslides, to prevent damaged properties and loss of lives. Surface engineering geological mapping at a 1:25000 scale was conducted to develop a detailed landslide susceptibility map for spatial planning and to identify most controlling factor of landslides in the research area based on conditions of geomorphology, rock and soil, geological structure, groundwater seepage, and land use. The engineering geological mapping showed that landslides commonly occurred in the moderate slopes of the denudational hill landform having slope inclination ranging from 9 to 17°, in the areas covered by residual soils of the vitric tuff 2 unit, in the areas of no groundwater seepage, and in the settlement areas, including in Kranjang Lor area where soil creeping occurred. The high susceptibility zone covered 55.5 % of the research area and was characterized by having slope inclinations ranging from 9 to 35°, engineering geological units of vitric tuff 2 and tuff breccia, and land uses of rice and dry fields and settlement. The low cohesion and very high swelling potential of the residual soils of the vitric tuff 2 unit were considered to be the main controlling factor of landslides in the research area.

Rembang Zone Petroleum Play, Stratigraphic and Petrographic Analysis of Ngrayong Formation as Reservoir, Jamprong Area, Tuban, East Java

2020 ◽  
Author(s):  
D., S. Reka
Keyword(s):  
Depositional Environment ◽  
Carbonate Platform ◽  
Research Area ◽  
Geological Mapping ◽  
Coarse Grained ◽  
Petrographic Analysis ◽  
North East ◽  
The North ◽  
Potential Reservoir ◽  
Sandstone Facies

The following research took place in the Jamprong area, Tuban Regency, East Java Province within a study area of 2 km2. Physiographically, the study area is situated in the anticlinorium of the Rembang Zone. This research aims to define the reservoir potential of outcrop samples from the Ngrayong Formation as an analogue for the subsurface. In addition, the depositional environment and the age of the rock in the research area was determined. The Ngrayong Formation is regarded as a potential reservoir in the North East Java Basin. The accumulated data consists of stratigraphy, petrographic analysisand paleontological analysis of rock samples, and geological mapping has been carried out to determine the distribution of rocks. Facies were determined based on outcrop observations and comprise predominantly arkose sandstone facies with fine – coarse grained, moderately sorted and with cross-bedding, herringbone, and lamination, and another facies namely massive carbonate grainstone. Based on these facies, the interpreted depositional environment is the transition of tidal flat to shallow marine carbonate platform with relative biostratigraphic age of Middle Miocene, Langhian to Serravallian (M6-M8 planktonic foraminiferal biozones). Rocks in the study area have porosity >20% or very good and permeability >130 or fair based on petrographic observations, and this supports the interpretation of the Ngrayong Formations as a potential reservoir of hydrocarbons.

scholarly journals Geochemistry Acidic Water of Banyupait River Effect Seepage of Crater Water Ijen Volcano, Asembagus, Situbondo, East Java, Indonesia

2020 ◽  
Author(s):  
Dwi Fitri Yudiantoro ◽  
Bambang Agus Irawan ◽  
Intan Paramita Haty ◽  
Dewi Sri Sayudi ◽  
Arum Suproboriniaru ◽  
...  
Keyword(s):  
River Water ◽  
Water Flow ◽  
River Flow ◽  
Chemical Elements ◽  
Research Area ◽  
Geological Mapping ◽  
Petrographic Analysis ◽  
Acidic Water ◽  
Basaltic Rocks ◽  
Quality Of Water

The Ijen volcano has Pleistocene age (294.00 ± 0.03 Ma), and this stratovolcano was very acidic crater water with a pH of 0-1. The acidic crater water seeps into the Banyupait river flow. Asembagus is a research area located on the northern slope of the Ijen volcano, and the Banyupait River drains this. The acidic river water flows from the Ijen Crater Lake, so the pH of the water river was very acidic. This study used several different analytic methodologies with some previous researchers, namely using the method of geological mapping, pH measurement, spectrophotometry, IRMS (Isotope Ratio Mass Spectrometer), and the technique of Induced Coupled Mass Spectrometry (ICP-MS). Besides, the petrographic analysis is used to determine the composition of rock minerals due to rocks interacting with acidic water. Banyupait River water in the Asembagus area has a pH of river water around 3-7.3, SO4 (220-683 ppm), and the type of water is meteoric water. Also, concentrations of Ca, K, Mg in the west Banyupait river irrigation water flow showed higher levels when compared to the eastern Banyupait River water flow. Likewise, REE elements from the Asembagus region showed lower concentrations compared to Ijen Crater water. This change in the level of chemical elements is caused by the acidity of the Banyupait River being diluted or mixed with water from other water. However, the spring was not affected by acidic water. The process of acidic water interaction with rocks can also be observed from rocks traversed by the Banyupait River flow. Chalcedony and hematite replace the primary minerals of basaltic rocks. This research is expected to improve the quality of water needed by the Asembagus community so that people can live healthily.

scholarly journals Geological mapping and stand-up time estimation based on core drill evaluation using RMR89 on Tunnel 3 Sigli Banda Aceh Toll Road

2021 ◽  
Vol 325 ◽  
pp. 02004
Author(s):  
Hanif Khoirul Latif ◽  
Salahuddin Husein ◽  
I Gde Budi Indrawan
Keyword(s):  
Rock Mass ◽  
Time Estimation ◽  
Research Area ◽  
Geological Mapping ◽  
Drill Core ◽  
Toll Road ◽  
Site Investigations ◽  
Geological Conditions ◽  
Core Evaluation ◽  
Banda Aceh

Tunnel 3 of the Sigli Banda Aceh Toll Road has been designed based on several site investigations. The site investigations have not included surface geological investigations. Subsurface geological investigations have been carried out but with less detailed drill core evaluation. This will cause less accuracy on the assessed tunnel stand-up time. This research aims to evaluate the engineering geological conditions at the tunnel construction site by conducting geological mapping with 1:5,000 scale and re-evaluating drill core using RMR89 method more thoroughly so that it can produce more accurate assessment of the tunnel stand-up time. The geological mapping result shows that the research area has three rock units, namely lapili, tuffaceous sandstones, and interbedded sandstone-siltstones, with moderate to fresh weathering degree. The drill core evaluation shows that research area has poor to good rock mass classes (34 – 67). The drill core evaluation results also indicate possible geological structures that may influence subsurface rock mass strength. The tunnel stand-up time obtained from the lowest RMR89 value for each drill core shows a value of 5 - 90 hours, implying immediate application of support system after tunnel excavation.

scholarly journals The Geology and Lamongan Volcanic Rocks Case Study at Ranu Pakis, Klakah, Lumajang, East Java Province, Indonesia

2019 ◽  
Vol 4 (4) ◽  
pp. 263-270
Author(s):  
Dwi Fitri Yudiantoro ◽  
Ramonada Taruna Perwira ◽  
Muchamad Ocky Bayu Nugroho
Keyword(s):  
Volcanic Rocks ◽  
Volcanic Glass ◽  
Research Area ◽  
Geological Mapping ◽  
Petrographic Analysis ◽  
Basalt Lava ◽  
Pyroclastic Deposits ◽  
Pyroxene Andesite ◽  
Surrounding Areas ◽  
Pyroclastic Fall

Lamongan volcano is one of the unique volcanoes in the Sunda Volcano. This volcano has side eruption centers or on the slopes of the volcano. The morphology of parasitic eruptions in this volcanoes complex includes maars and boccas. There are about 64 parasitic eruption centers consisting of 37 volcanic cones (bocca) and 27 ranu (maar). The purpose of this research is to study the characteristics of lithology and petrogenesis of this volcano complex, especially in Ranu Pakis and surrounding areas. The analytical method used is to do geological mapping and petrographic analysis. The lithology found in this research area consists of magmatic and phreatomagmatic eruption deposits. Genetically this lithology includes pyroclastic flow, pyroclastic fall (scoria fall and phreatomagmatic scoria fall/accretionary lapili), tuff (phreatic) and basaltic lava. In some pyroclastic deposits, especially in maar there are fragments of accretionary lapilli, while in bocca there are basaltic lavas. Other fragments present in pyroclastic deposits are basalt scoria blocks and bombs embedded in the groundmass of volcanic ash. The results of petrographic analysis indicate that the volcanic rocks in the study area are calc alkaline affinity consisting of pyroxene andesite, basalt and pyroxene basalt lava. The pyroxene basalt lava is composed by plagioclase, clinopyroxene and little olivine embedded in the volcanic glass. Lavas are structured scoria and textured porphyritic, intersertal, trachytic, aphyric and pilotaxitic. Trachytic texture is found in the basalt fragments of pyroxene from the pyroclastic fall deposits in Ranu Pakis and Ranu Wurung. While pyroxene andesite lavas composed by plagioclase, clinopyroxene embedded in the volcanic glass. Lavas are structured scoria and textured porphyritic, intergranular, pilotaxitic and aphyric.

scholarly journals Geological Aspect to Enhance Cultural Heritage at Ngempon Temple Geotourism Site, Semarang Regency, Central Java

2021 ◽  
Vol 317 ◽  
pp. 01031
Author(s):  
Mohamad Fajril Falah ◽  
Jenian Marin ◽  
Tri Winarno
Keyword(s):  
Data Collection ◽  
Field Data ◽  
Hot Springs ◽  
Research Area ◽  
Geological Mapping ◽  
Petrographic Analysis ◽  
Central Java ◽  
Field Data Collection ◽  
Lower Pleistocene ◽  
Historical Sites

Ngempon Temple is one of the historical sites around the Mount Ungaran area. Ngempon Temple is the result of Hindu civilization in Indonesia which was built in the VIII-IX century. This research was conducted in the Ngempon area because it is necessary to conserve historical sites associated with geological sites in the study area. This study aims to determine the geological aspects that have the potential to become geotourism sites in the research area. The methods used are geological mapping for field data collection and petrographic analysis to determine rock characteristics. There are several sites including historical sites and geological sites in the vicinity of Ngempon Temple, namely Ngempon Temple, Diwak Waterfall, and Derekan Hot Springs. The lithologies found in the research area are claystone, tuff sandstone, basaltic andesite breccia, and andesite breccia. The volcanic rock in the research area is formed by Mount Ungaran activity during Lower Pleistocene until Holocene.

scholarly journals Groundwater exploration using Vertical Electrical Sounding (VES) Method at Toro Jaya, Langgam, Riau

2018 ◽  
Vol 3 (4) ◽  
pp. 226
Author(s):  
Adi Suryadi ◽  
Dewandra Bagus Eka Putra ◽  
Husnul Kausarian ◽  
Budi Prayitno ◽  
Reza Fahlepi
Keyword(s):  
Data Acquisition ◽  
Research Area ◽  
Unconfined Aquifer ◽  
Groundwater Exploration ◽  
Vertical Electrical Sounding ◽  
Confined Aquifer ◽  
Low Resistivity ◽  
Value Range ◽  
Electrical Sounding ◽  
Clay Layers

Vertical Electrical Sounding (VES) method is one of many methods in geophysics that was conducted in this research at Toro Jaya, Langgam, Riau. The aim of this research is to investigate and locate the depth of groundwater layer (aquifer). Data acquisition of VES was carried out using GEOCIST with Schlumburger configuration of electrode. There are four VES point in this research with various length of cable ranging from 135 m up to 200 m. From four VES point shown two different of resistivity value range. Very low resistivity value with range 0,34 – 0,9 Ωm interpreted as aquifer layer. The aquifer layer of research area divided into two types which are unconfined aquifer and confined aquifer. Meanwhile, another resistivity value ranging from 1,69 – 7  Ωm was interpreted as clay layers.

scholarly journals Depositional Environment Analysis Carbonate Rocks in Montasik District

2020 ◽  
Vol 9 (3) ◽  
pp. 72-77
Author(s):  
Fahri Adrian ◽  
Ariadi Putra ◽  
Akmal Muhni ◽  
Marwan Marwan
Keyword(s):  
Carbonate Rocks ◽  
Depositional Environment ◽  
Research Area ◽  
Geological Mapping ◽  
Environment Analysis ◽  
Reef Facies ◽  
Geological Conditions ◽  
Platform Margin ◽  
Facies Zone ◽  
Direct Data

Kecamatan Montasik terdiri dari 2 formasi yaitu Formasi Gunungapi Lam Teuba berumur Pliosen Akhir sampai Plistosen Akhir dan Formasi Anggota Padangtiji berumur Pliosen Awal sampai Pliosen Tengah. Litologi Formasi Anggota Padangtiji terdiri dari konglomerat, batulanau, batupasir gampingan dan batu gamping. Lingkup penelitian ini meliputi kajian tentang kondisi geologi permukaan dan analisis lingkungan pengendapan sedimen karbonat pada lokasi penelitian. Metode yang digunakan dalam penelitian ini yaitu pengambilan data langsung di lapangan dan menganalisis petrologi dan petrografi pada sampel batuan. Litologi pada lokasi penelitian terdiri dari 7 satuan yaitu guguran lava, lava andesit, lapili jatuhan piroklastik, tuf jatuhan piroklastik, konglomerat, batugamping terumbu dan batupasir gampingan. Lingkungan pengendapan sedimen karbonat yang terdapat pada lokasi penelitian terbentuk di laut dangkal (reef) pada kedalaman 0 m - 200 m di bawah permukaan laut. Zona fasies pengendapan batugamping pada lokasi penelitian terendapkan pada zona platform margin sands  dan organic buildups. Sedangkan zona fasies terumbu pada lokasi penelitian terdapat pada zona reef front. Montasik district consists of two formations, Gunungapi Lam Teuba Formation aged Late Pliocene – Late Pleistocene and Padangtiji Member aged Early Pliocene – Middle Pliocene. Lithology of Padangtiji Member consists of conglomerate, siltstone, carbonate sandstone, and limestone.  The scope of this research includes a study of surface geological conditions and depositional environmental analysis of carbonate sediment. The method used in this study is direct data collection in the field and analyzing petrology and petrography in rock samples. Lithology of the research area consists of lava drop, andesit, lapili pyroclastic, tuff pyroclastic, conglomerate, fosilliferous limestone, and carbonate sandstone. Depositional environment in the research area formed at shallow marine (reef) on 0m-200m depth under sea level. Depositional facies zone in the research area is on the margin sands platform zone and organic buildups, while Reef facies zone contained in reef front zone.Keywords: Geological Mapping, Depositional Environment, Carbonate Rocks, Petrography, Montasik

scholarly journals Geodiversity of Menganti Paleo-Volcano: New Insight to Geotourism Potential in Kebumen, Central Java, Indonesia

2020 ◽  
Vol 5 (1) ◽  
pp. 11-24
Author(s):  
Fadlin ◽  
Gentur Waluyo ◽  
Yohanes Iwan ◽  
Nita Ariyanti ◽  
Nanda Ajeng Nurwantari
Keyword(s):  
Quantitative Assessment ◽  
Economic Value ◽  
Research Area ◽  
Field Investigation ◽  
Point Of View ◽  
Geological Mapping ◽  
Qualitative Assessment ◽  
Landscape Models ◽  
Geological Conditions ◽  
Geological Diversity

Karangbolong is a morphological dome in Kebumen area, that has a high geological diversity and have a lot of tourism potential, but has not been developed optimally as a geotourism potential based on conservative and educative aspects, especially the existence of ancient volcano of Menganti the quite interesting from a geological point of view, so in this case an inventory of a geological diversity is required. This study aims to understand the geological conditions and conduct an assessment of the feasibility of geodiversity in ancient volcano complex of Menganti. The methodology for this research is a direct observation in the field based on the surface geological mapping, rock sampling for petrology study of rocks for supporting the quantitative assessment of genocide in the research area. The research area has 2 (two) landscape models, ie,ex-volcanic landscape, in this case occupying 95% of the research area and then the karst landscape, occupying 5% of the research area. Stratigraphy of the research area can be divided into 5 units from old to young, that is basaltic lava of Menganti, the pyroclastic flow of Menganti which is interfingering with andesitic lava of Karangduwur, andesite-basalt intrusion unit, and limestone of Agropeni. Based on field investigation, the research area has 27 geosite objects that can be developed as geotourism potential, covering 3 geomorphological sites, 7 lithology sites, 9 cave karst sites, 5 beach sites, and 2 waterfall sites. Based on the results of quantitative assessment of geosites in the research area with accessibility, state of preservation, scientific wort, and educational significance parameters, the research area has a geodiversity index from 19 until 24, in this case, the research area has good until very good grade to be developed as a geotourism potential base on educative and conservative, in order to improve the economic value of local communities.   Keywords: Qualitative assessment, geodiversity, geotourism, paleo-volcano, Kebumen.

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