scholarly journals Geological Mapping of Gunungbatu and Surrounding Areas, Bodeh District, Pemalang Regency, Central Java

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Fajar Rizki Widiatmoko ◽  
Mochammad Aziz ◽  
Irwan Firmansyah
Keyword(s):  
Middle Miocene ◽  
Research Area ◽  
Geological Mapping ◽  
Geological History ◽  
River Sand ◽  
Central Java ◽  
Tectonic History ◽  
Geomorphological Units ◽  
History Of ◽  
Surrounding Areas

Mapping is the activity of collecting data from an area to be mapped, in the context of geology mapping means collecting data that includes descriptions of rocks, rock structures, rock positions, structure measurements (plunge/trend, pitch, microfold), rock thickness measurements, rock sampling and sketches. landscape, covering an area to be mapped. Research in the area of Gunungbatu and its surroundings, Bodeh District, Pemalang Regency, Central Java Province with the aim of knowing and knowing that it is in the research area by reconstructing the history of formation or geomorphological history, merely tectonic history in space and time, reconstructing geological history based on micropaleontological analysis. Based on the analysis carried out, it was found that the geomorphological units of the study area were divided into 5, namely the Gunungbatu Syncline Hills Unit, the Kali Bodas Anticline Valley Unit, the Girimulya Syncline Hills Unit, the Cenggiri Homocline Hills Unit and the Kebubung Homocline Valley Unit. The geology of the study area consists of two unofficial rock units in order from oldest to youngest, namely the claystone-sandstone unit and the sandstone-claystone unit. The geological structures of the pinpoint folds and faults are Mount Ketos Syncline, Kali Bodas Anticline, Gapura Syncline, Pertapan Igir Syncline, Cenggiri River Rising Fault, Kebubung Dextral Fault, and Girimulya Dextral Fault. The geological history of the research area begins with the book Unit of Claystone in the Middle Miocene Environment in Upper Bathyal. Furthermore, after the claystone-sandstone units were deposited, during the Middle Miocene – Late Miocene in the Deep Neritic Environment, the sandstone-claystone units were deposited with a turbidite mechanism. As well as the geological resource potential of the research area in the form of river utilization in the form of chunks of igneous rock, river sand deposits and gold seepage. Meanwhile, the potential for geological disasters in the form of landslides.

scholarly journals Geological Mapping of the Longkeyang and Surrounding Regions, Bodeh District, Pemalang Regency, Central Java

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Irwan Firmansyah ◽  
Adi Candra ◽  
Fajar Rizki Widiatmoko
Keyword(s):  
Middle Miocene ◽  
Research Area ◽  
Geological Structure ◽  
Geological Mapping ◽  
Research Activity ◽  
River Sand ◽  
Geological Disasters ◽  
Central Java ◽  
Geological Conditions ◽  
River Deposits

Geological mapping is one of the important things as part of a field study to obtain geological knowledge. This is due to the need for a geologist who is required to be able to understand the geological conditions of an area, one of which is by conducting mapping activities in the field. In conducting this research activity, it is divided into two stages, namely the field stage and the laboratory stage. The purpose of this research is to determine the characteristics and geological conditions, identify resource potentials and potential geological disasters in the research area. Based on the analysis, it was found that the geomorphological units of the study area were divided into 4 (four), namely the Mount Ketos Homocline Hills Unit, the Polaga River Anticline Valley Unit, the Sarangkadu Cycline Hills Unit, and the Mount Lanji Intrusion Hills Unit. The geology of the study area consists of three rock units in order from oldest to youngest, namely the claystone-sandstone unit and the sandstone-claystone unit and the diorite intrusion unit. The geological structure of the pinnacle area is in the form of folds and faults, namely, Polaga River Anticlines, Sarangkadu Synclines, Polaga River Right Shear Fault, Polaga River Left Shear Fault. The geological history of the study area begins with the deposition of claystone-sandstone units during the Middle Miocene in the Upper Bathyal environment. Furthermore, after the claystone-sandstone units were deposited, during the Middle Miocene – Late Miocene in the Deep Neuritic environment, sandstone-claystone units were deposited with a turbidity deposition mechanism. As well as the geological resource potential of the research area in the form of utilization of river deposits in the form of chunks of igneous rock, river sand deposits and indications of the presence of gold. Meanwhile, the potential for geological disasters in the form of landslides.

The Deep Roots of Geology: Tectonic History of Australia Preserved as Mantle Anisotropy

2021 ◽  
Author(s):  
Caroline Eakin
Keyword(s):  
Seismic Anisotropy ◽  
Small Scale ◽  
Continental Margins ◽  
Geological History ◽  
Deep Roots ◽  
Geographical Patterns ◽  
Tectonic History ◽  
History Of ◽  
Mantle Anisotropy ◽  
Continental Interior

Abstract Australia is an old stable continent with a rich geological history. Limitations in sub-surface imaging below the Moho, however, mean that is unclear to what extent, and to what depth, this rich geological history is expressed in the mantle. Scattering of surface waves at ~150km depth by lateral gradients or boundaries in seismic anisotropy, termed Quasi-Love waves, offer potential new insights. The first such analysis for Australia and Zealandia shown here detects over 300 new scatterers that display striking geographical patterns. Around two-thirds of the scatterers are coincident with either the continental margins, or major crustal boundaries within Australia, suggesting deep mantle roots to such features. Within the continental interior such lateral anisotropic gradients imply pervasive fossilized lithospheric anisotropy, on a scale that mirrors the crustal geology at the surface, and a strong lithosphere that preserves this signal over billions of years. Along the continental margins, lateral anisotropic gradients may indicate either the edge of the thick continental lithosphere, or small-scale dynamic processes in the asthenosphere, such as edge-drive convection, tied to the transition from oceanic to continental crust/lithosphere.

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 Stratigraphy of Kendeng Zone in Miyono Village and Surrounding, Sekar District, Bojonegoro Regency, East Java, Indonesia

2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Mutawif Ilmi Muwaffiqih ◽  
Wahyu Ardiansyah Nugraha ◽  
Irvan Fatarwin Lubis ◽  
Mochammad Indra Novian
Keyword(s):  
Benthic Foraminifera ◽  
Depositional Environment ◽  
Planktonic Foraminifera ◽  
Research Area ◽  
Geological Mapping ◽  
Laboratory Analysis ◽  
Petrographic Analysis ◽  
Accurate Data ◽  
Geological Structures ◽  
Surrounding Areas

This paper will comprehensively discuss the stratigraphy of the Kendeng Zone by using geological field mapping and laboratory analysis. The research area located in the Miyono Village and surrounding areas, Sekar District, Bojonegoro Regency, East Java with an area of 4x5 km2. Based on the geological mapping results obtained 160 points station with a variety of results in the form of tracking map of the research area. Laboratory analysis uses Embry and Klovan classification (1971), Pettijohn et al. (1987), and Mount (1985) for petrographic analysis, while paleontological analysis using Manual of Planktonic Foraminifera (Postuma, 1971) and Atlas of Benthic Foraminifera (Holbourn et al., 2013). This paper will show the differences between regional stratigraphy and the result, depositional environment, and its mechanism. Lithology units found grouping into nine units. The research area epoch ranged between N18-N23 (early Pliocene - Holocene) and the depositional environment from the lower bathyal to the terrestrial. The geological structures of the research area must be considered in the stratigraphic arrangement determination. Based on the analysis, the Kendeng Zone stratigraphic column was obtained and expected to provide accurate data of Kendeng Zone specifically around Miyono area.

scholarly journals Crustal Deformations and Geomorphological Units of Arabian Plate Foreland Region, North and Northeast of Iraq

2019 ◽  
Vol 54 (5) ◽  
Author(s):  
Ahmed Abbas Hasan ◽  
Mohammed Lateef Hussien ◽  
Linaz Anis Fadhil ◽  
Mariam Isam Hasan ◽  
Cristina Dallos Mosquera
Keyword(s):  
Cross Sections ◽  
Fault System ◽  
Arabian Plate ◽  
Alluvial Fans ◽  
Zagros Mountains ◽  
Flood Plains ◽  
Tectonic History ◽  
Geomorphological Units ◽  
History Of ◽  
Geologic Factor

The crustal shortening in the foreland of Arabian Plate (the Taurus and Zagros Mountains system) in N and NE of Iraq is accommodated in two principal ways: folding and thrusting. The fold and thrust patterns have evolved as an expression of shortening which was approximately NE-SW directed and subparallel to the bedding. In this area, observations of deformations along different cross sections were made using balancing cross sections for the estimation of the total shortening on five cross sections. The authors showed that shortening deformations were irregular and non-identical, which date back to the same age and the same location. This suggests that defects in this region are not homogeneous due to irregular bottom of the sedimentary basin, fault system and the form of the collision zone between the Arabian Plate and Iranian Plate or between the Arabian Plate and the Anatolian Plate. According to these magnitudes, the foreland region of Arabian Plate is affected by inhomogeneous deformations that are related rather to where these structures were developed, than to when they were formed. This study demonstrates the significant influence of geologic factor (especially structure) in forming and developing geomorphological features with a structural origin. These features are associated with tectonic history of the study area, such as units of structural origin. Another features related to the denudational factors, like glacis and badland, in addition to the features of fluvial origin which are alluvial fans, terraces and flood plains.

Tectonic History of Australia Preserved by Mantle Anisotropic Boundaries

2021 ◽  
Author(s):  
Caroline Eakin
Keyword(s):  
Seismic Anisotropy ◽  
Small Scale ◽  
Continental Margins ◽  
Surface Imaging ◽  
Geological History ◽  
Continental Lithosphere ◽  
Geographical Patterns ◽  
Tectonic History ◽  
History Of ◽  
Continental Interior

<p>Australia is an old stable continent with a rich geological history. Limitations in sub-surface imaging below the Moho, however, mean that is unclear to what extent, and to what depth, this rich geological history is expressed in the mantle. Scattering of surface waves at ~150km depth by lateral gradients or boundaries in seismic anisotropy, termed Quasi-Love waves, offer potential new insights. The first such analysis for Australia and Zealandia is performed with over 300 new scatterers detected that display striking geographical patterns. Around two-thirds of the scatterers are coincident with either the continental margins, or major crustal boundaries within Australia, suggesting deep mantle roots to such features. Within the continental interior such lateral anisotropic gradients imply pervasive fossilized lithospheric anisotropy, on a scale that mirrors the crustal geology at the surface, and a strong lithosphere that preserves this signal over billions of years. Along the continental margins, lateral anisotropic gradients may indicate either the edge of the thick continental lithosphere, or small-scale dynamic processes in the asthenosphere, such as edge-drive convection, tied to the transition from oceanic to continental crust/lithosphere.</p>

scholarly journals Engineering Geological Characteristics Based on Rock Mass Rating (RMR) and Geological Strength Index (GSI) in Jlantah Dam Intake Tunnel, Karanganyar District, Central Java Province

2021 ◽  
Vol 325 ◽  
pp. 08003
Author(s):  
Doni Apriadi Putera ◽  
Heru Hendrayana ◽  
I Gde Budi Indrawan
Keyword(s):  
Rock Mass ◽  
Research Area ◽  
Geological Mapping ◽  
Geological Strength Index ◽  
Rock Mass Rating ◽  
Strength Index ◽  
Tunnel Support ◽  
Weak Rocks ◽  
Rock Mass Characterization ◽  
Central Java

This paper presents the results of a geological engineering investigation in the form of rock mass characterization at the Jlantah Dam Intake Tunnel. The study was carried out through technical geological mapping, core drill evaluation and supported by laboratory test data. The determination of rock mass classification at the research site has been carried out using the Rock Mass Rating (RMR) method, but it is necessary to use another method that is more suitable based on rock mass for weak rocks, namely using the Geological Strength Index (GSI) method.The rock mass quality will be used as a parameter in determining the excavation method and tunnel support system that will be used in the Jlantah Dam intake tunnel. The results showed that the research area consisted of lithology in volcanic breccias and tuff lapilli. GSI rock mass value at the research location ranged from 15 - 65, while the RMR value ranged from 24 - 70. The correlation between RMR and GSI in the study area is different when compared to Hoek and Brown (1997) but has similarities with Zhang et al (2019).

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