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  • 1
    Online Resource
    Online Resource
    UIR Press ; 2019
    In:  Journal of Geoscience, Engineering, Environment, and Technology Vol. 4, No. 2 ( 2019-06-30), p. 104-
    In: Journal of Geoscience, Engineering, Environment, and Technology, UIR Press, Vol. 4, No. 2 ( 2019-06-30), p. 104-
    Abstract: This research aimed to reveal the petrogenesis of granitic rocks of Bayah Complex starting from magma differentiation to exposing event, this research also intended to determine the tectonic environment. The methods carried out in this research include field observation, petrographic analysis using polarized light microscopy, and geochemical analysis using X-Ray Fluorescence (XRF) and Inductively Coupled Mass Spectrometry (ICP-MS). Petrographic analysis shows that Bayah granitic rocks are composed of quartz, plagioclase, and K-feldspar while the rest are amphibole, biotite, sericite, chlorite, epidote, and opaque. Based on its major oxide concentrations, Bayah granitic rocks classified as granite and diorite-quartz which have high-K calc-alkaline magma. 4 samples of granitic rocks showed the A/N+K+C 〉 1 molar ratios belonging to the peraluminous S-type granite index while the remaining 1 sample showed a molar ratio of A/N+ K+C 〈 1 and A/N+K 〉 1 which classified as metaluminous I-type granite. Accordingly, Bayah granitic rocks are S-type granite which crystallized from sediment-derived magma, the sediments itself estimated sourced from continental especially Malay Peninsula, Indonesian Tin Island, and Schwaner Mountains. During differentiation, the magma undergone crustal contamination reflected by the increase in both SiO2 0.51 wt% and Al2O3 1.95 wt%, and decrease in Fe2O3 + MgO 0.61 wt% from the pure composition of sediment-derived magma. Furthermore, the occurrence of crustal contamination also recognized from high concentrations of Rb and Ba which indicate the interaction of magma with the materials of continental crust. Regard to the exposing event, Bayah granitic rocks approximated to be exposed due to regional tectonic activity which caused Orogenesa I in the Early Oligocene to the Late Oligocene. Moreover, based on the plot of trace elements especially Rb, Y, Nb, Ta, and Yb on Harker and tectonic discriminant diagrams, Bayah granitic rocks are formed on volcanic-arc active continental margins in accordance with regional tectonic setting.           
    Type of Medium: Online Resource
    ISSN: 2541-5794 , 2503-216X
    URL: Issue
    Language: Unknown
    Publisher: UIR Press
    Publication Date: 2019
    detail.hit.zdb_id: 3069706-2
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  • 2
    Online Resource
    Online Resource
    Marine Geological Institute ; 2016
    In:  BULLETIN OF THE MARINE GEOLOGY Vol. 23, No. 1 ( 2016-02-15), p. 1-
    In: BULLETIN OF THE MARINE GEOLOGY, Marine Geological Institute, Vol. 23, No. 1 ( 2016-02-15), p. 1-
    Abstract: The new bathymetry and seismic data were acquired during the PreTI-Gap marine survey (February 15 to March 6, 2008). The survey was carried out along the NE margin of Mentawai Island using multi-beam swath bathymetry equipment, and 28-channels seismic streamer and four-airgun source. The first target was the Mega Island region near the epicenter of the 2007 great earthquake. The shallow bathymetry is characterized as a flat coral platform suggesting that 200 km elongated plateau is slowly subsiding without any active faults. Further north, from South Pagai to North of Siberut Islands, the seafloor morphology changes significantly. The deep and wide canyons or valleys produce very rough seafloor morphology between 50 and 1100 m water. In general, the submarine topography shows two break slopes at different depths. Between slope breaks, the undulating, hilly and circular features dominate, possibly caused by landslides. A push-up ridge is observed that dams the sediments eroded within a steep slope northeastward side. The seismic reflection data acquired along 14 dip seismic lines at the NE flank of Mentawai Islands, from Siberut to the South of Pagai Islands. We observed a set of southwestward dipping back thrust bounding the NE margin of the Mentawai Island. Keywords: submarine landslide, tsunami, Mentawai basin, Sumatra. Data batimetri dan seismik baru telah dihasilkan selama survey kelautan PreTi-Gap (15 Februari hingga 6 Maret 2008). Survei dilaksanakan sepanjang tepian timurlaut P. Mentawai menggunakan peralatan multibeam, seismic saluran ganda 28 kanal dengan sumber energi airgun. Sasaran pertama adalah memetakan kawasan pulau dekat pusat gempa tahun 2007. Kenampakan batimetri dangkal dicirikan dengan adanya dataran terumbu karang yang secara perlahan mengalami penurunan tanpa aktifitas sesar. Lebih jauh ke Utar, dari Pagai Selatan ke utara P. Siberut, morfologi dasar laut memperlihatkan perubahan secara signifikan, dimana lembah dasar laut memiliki lebar dan beda kedalaman antara 50 hingga 1100 meter. Secara umum, topografi dasar laut memperlihatkan dua kemiringan pada kedalaman yang berbeda dengan dicirikan adanya kenampakan perlipatan, perbukitan dan bentuk yang melingkar diperkirakan sebagai hasil gelinciran. Sebanyak 14 line data seismik refleksi pada sayap bagian timurlaut P. Mentawai, dari Siberut hingga ke selatan P. Pagai memperlihatkan adanya bukti sesar naik yang miring ke arah baratdaya yang masih satu set dengan tepian timurlaut P. Mentawai. Kata kunci: longsoran bawah laut, tsunami, Cekungan Mentawai, Sumatra.
    Type of Medium: Online Resource
    ISSN: 2527-8843 , 1410-6175
    Language: Unknown
    Publisher: Marine Geological Institute
    Publication Date: 2016
    detail.hit.zdb_id: 3070436-4
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  • 3
    Online Resource
    Online Resource
    Marine Geological Institute ; 2016
    In:  BULLETIN OF THE MARINE GEOLOGY Vol. 25, No. 2 ( 2016-02-15), p. 53-
    In: BULLETIN OF THE MARINE GEOLOGY, Marine Geological Institute, Vol. 25, No. 2 ( 2016-02-15), p. 53-
    Abstract: The new bathymetry and seismic data were acquired during the PreTI-Gap marine survey (February 15 to March 6, 2008). The survey was carried out along the NE margin of Mentawai Island using multi-beam swath bathymetry equipment, and 28-channels seismic streamer and four-airgun source. The first target was the Mega Island region near the epicenter of the 2007 great earthquake. The shallow bathymetry is characterized as a flat coral platform suggesting that 200 km elongated plateau is slowly subsiding without any active faults. Further north, from South Pagai to North of Siberut Islands, the seafloor morphology changes significantly. The deep and wide canyons or valleys produce very rough seafloor morphology between 50 and 1100 m water depth. In general, the submarine topography shows two break slopes at different depths. Between slope breaks, the undulating, hilly and circular features dominate, possibly caused by mass movement. A push-up ridge is observed that dams the sediments eroded within a steep slope northeastward side. The seismic reflection data acquired along 14 dip seismic lines at the NE flank of Mentawai Islands, from Siberut to the South of Pagai Islands. We observed a set of southwestward dipping back thrust bounding the NE margin of the Mentawai Island and the push-up ridge observed on bathymetric image, which suggest that Mentawai fault is not pure a strike slip fault, but consists of a set of back thrusts. Such kind of back thrust movement at the flank of Mentawai basin can trigger mass movement or landslide that can produce localized tsunami causing damages to Sumatera mainland such as Padang, Painan or northern Bengkulu provinces and Mentawai Islands. Therefore, it is important to re-design the tsunami warning system, especially in this region, in order to mitigate tsunami risk to coastal region of western Sumatera. Keywords: multi-beam swath bathymetry, 28-channels seismic streamer, seismic reflection, back thrust, mass movement or landslide, tsunami warning system, mitigate tsunami risk Data batimetri dan seismik baru telah didapatkan selama survey kelautan PreTi-Gap (15 Februari hingga 6 Maret 2008). Survei dilaksanakan sepanjang tepian timurlaut Kepulauan. Mentawai menggunakan peralatan multibeam batimetri, seismik saluran ganda 28 kanal dengan 4 sumber energi airgun. Sasaran pertama adalah memetakan kawasan perairan P. Mega dekat pusat gempa besar tahun 2007. Kenampakan batimetri dangkal dicirikan dengan adanya dataran paparan terumbu karang sepanjang 200km yang secara perlahan mengalami penurunan tanpa akifitas sesar. Lebih jauh ke utara dari P. Pagai Selatan sampai di utara P. Siberut, morfologi dasar laut memperlihatkan perubahan secara signifikan yaitu lembah dalam dan lebar membentuk morfologi dasarlaut yang kasar dengan beda kedalaman antara 50 hingga 1100 meter. Secara umum, topografi dasar laut memperlihatkan perhentian dua lereng pada kedalaman yang berbeda. Diantara batas lereng yang dicirikan adanya kenampakan perlipatan, perbukitan dan bentuk melingkar diperkirakan sebagai hasil gelinciran batuan/tanah. Punggungan terangkat yang teramati merupakan penahan endapan yang melongsor pada lereng curam pada sisi sebelah timurlaut. Sebanyak 14 lintasan sismik refleksi pada sayap bagian timurlaut Kepulauan Mentawai, dari P. Siberut hingga ke selatan P. Pagai. Patahan anjak belakang yang teramati dengan sudut kemiringan ke arah baratdaya memotong bagian tepian timurlaut dari Kepulauan Mentawai dan punggungan terangkat yang terekam pada peta batimetri menegaskan bahwa Patahan Mentawai bukan murni sebagai patahan geser mengkanan akan tetapi juga memiliki komponen patahan anjak belakang. Setiap pergerakan sesar anjak di sisi Cekungan Mentawai dapat memicu gerakan tanah atau longsoran bawah laut dapat membangkitkan tsunami lokal yang mengakibatkan kerusakan di daratan Sumatera seperti di Padang, Painan atau Propinsi Bengkulu bagian utara dan Kepulauan Mentawai. Oleh karena itu adalah sangat penting untuk merencanakan sistim peringatan tsunami khususnya di kawasan tersebut dengan tujuan untuk melakukan mitigasi resiko bencana tsunami di kawasan pantai barat Sumatera. Kata Kunci: multibeam batimetri, seismik saluran ganda 28 kanal, sismik refleksi, sesar anjak belakang, gerakan tanah atau longsoran, peringatan dini tsunami, mitigasi resiko tsunami
    Type of Medium: Online Resource
    ISSN: 2527-8843 , 1410-6175
    Language: Unknown
    Publisher: Marine Geological Institute
    Publication Date: 2016
    detail.hit.zdb_id: 3070436-4
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  • 4
    In: Jurnal Teknologi, Penerbit UTM Press, Vol. 83, No. 1 ( 2020-12-07), p. 117-125
    Abstract: Soil is the most diverse environment that can cause metal corrosion. Many researchers claim that soil is a corrosive environment that has complexity compared to other environments. With a background knowledge of soil engineering properties in a specific area and their effects on the metal corrosion process then corrosion problems can be prevented. This paper presents the relationship between andesitic volcanic soil engineering properties with an average corrosion rate based on geotechnical and statistical methods. In this paper, we propose a new average corrosion rate per year on that soil. The study area took place on the Sekincau-Way Tenong Transect Road, West Lampung, Sumatra, Indonesia. This area was composed of silty clay to clayey silt soils which weathering products from andesitic-basaltic volcanic breccia. This soil can store water that is moderate to high and has high plastic properties. Based on the statistical approach, it can be concluded that the corrosion rate in andesitic volcanic soils is 1.132 mm/yr. Soil engineering properties (water content, index plasticity, and clay content) simultaneously affect the average corrosion rate. The effective contribution of each independent variable (soil engineering properties) to the corrosion rate is a plasticity index of 39.5%, the water content of 24.79%, and clay content of 26.04%. Index plasticity and water content were found to raise the average corrosion rate at the soil samples, while clay content was on the side that lowered the average corrosion rate.
    Type of Medium: Online Resource
    ISSN: 2180-3722 , 0127-9696
    Language: Unknown
    Publisher: Penerbit UTM Press
    Publication Date: 2020
    detail.hit.zdb_id: 2780014-3
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  • 5
    Online Resource
    Online Resource
    Elsevier BV ; 2000
    In:  Comptes Rendus de l'Académie des Sciences - Series IIA - Earth and Planetary Science Vol. 331, No. 11 ( 2000-12), p. 691-699
    In: Comptes Rendus de l'Académie des Sciences - Series IIA - Earth and Planetary Science, Elsevier BV, Vol. 331, No. 11 ( 2000-12), p. 691-699
    Type of Medium: Online Resource
    ISSN: 1251-8050
    Language: French
    Publisher: Elsevier BV
    Publication Date: 2000
    SSG: 11
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  • 6
    Online Resource
    Online Resource
    National Research and Innovation Agency ; 2014
    In:  Jurnal RISET Geologi dan Pertambangan Vol. 24, No. 2 ( 2014-11-19), p. 115-
    In: Jurnal RISET Geologi dan Pertambangan, National Research and Innovation Agency, Vol. 24, No. 2 ( 2014-11-19), p. 115-
    Type of Medium: Online Resource
    ISSN: 2354-6638 , 0125-9849
    Language: Unknown
    Publisher: National Research and Innovation Agency
    Publication Date: 2014
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  • 7
    Online Resource
    Online Resource
    Faculty of Mining, Geology and Petroleum Engineering ; 2021
    In:  Rudarsko-geološko-naftni zbornik Vol. 36, No. 4 ( 2021), p. 85-105
    In: Rudarsko-geološko-naftni zbornik, Faculty of Mining, Geology and Petroleum Engineering, Vol. 36, No. 4 ( 2021), p. 85-105
    Abstract: Karangsambung, located in Central Java, Indonesia has complex geological conditions of the tectonic evolution of Java Island due to the subduction process of the India-Australia plate with the Eurasian plate in the Cretaceous-Paleocene. The tectonic movements in the subduction zone have resulted in diverse geological structures and rock types and impact the morphological shape of the study area. The level of tectonic activity in the study area can be determined using a tectonic geomorphological approach. A digital elevation model and geographic information systems are used for geomorphic data processing. Geological data observations were also carried out in the form of river terraces. Seven geomorphic index parameters have been calculated to determine the youngest tectonic activity through the relative tectonic activity index (IAT) of the study area: the ratio of the valley floor width to the valley height, the drainage basin asymmetry, the river gradient-length index, the basin shape index, mountain front sinuosity, drainage density, and the hypsometric integral/hypsometric curve. The IAT score is divided into four classes which are class 1 (0%) very highly, class 2 (13%) highly, class 3 (56%) moderately, and class 4 (31%) low. The IAT shows that the research area is categorized as an active tectonic area so that the morphology formed is more influenced by tectonic activity than erosion. Geological data analysis on uplifted and deformed river terrace outcrops shows that the study area is affected by neotectonic activity.
    Type of Medium: Online Resource
    ISSN: 1849-0409
    Uniform Title: TECTONIC GEOMORPHOLOGY OF THE KARANGSAMBUNG AREA, CENTRAL JAVA, INDONESIA
    URL: Issue
    Language: Unknown
    Publisher: Faculty of Mining, Geology and Petroleum Engineering
    Publication Date: 2021
    SSG: 19,1
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  • 8
    In: Environmental & Socio-economic Studies, Walter de Gruyter GmbH, Vol. 8, No. 4 ( 2020-12-01), p. 1-10
    Abstract: Swelling potential characterization of clay-silt soil is an essential issue in stabilization, settlement, consolidation, and land suitability studies. This article attempts to explain the swelling characteristics of soils around the area of West Lampung, Lampung Province, Sumatra, Indonesia, in relation to environmental issues. An investigation in relation to the soil swelling potential was carried out using 15 disturbed soil samples collectd in the study area. The methods used were analyses of clay mineral geochemistry, physical characteristics, and the free swell ratio. These results showed that the soil in the study area was Quaternary tropical volcanic residual soil. These soils were formed in a proximal volcanic hydrothermal alteration environment. The soils of the study area have characteristics of high plasticity, a reddish-brown colour, and are clayey silt grained (MH) (USCS). The soils had loose physical characteristics in dry conditions; however, these soils tends to be plastic and sticky in wet conditions. Evidence of groove erosion was found at the soil surface. Based on XRD analysis, kaolinite, halloysite, and montmorillonite were types of clay minerals found in the soil. The soil had a clay content of 11.05–78.9%, a liquid limit value 〉 50%, a plasticity index value of 16.7–36.9%, a shrinkage value of 14.24–36.89%, a soil activity of 0.38–2.47; and an FSR value of 0.69–0.95. These characteristics have implications for swelling soil potential. The results showed that the soils in the study area had medium to very high swelling potential. These results suggest a risk of erosion in the area, which could cause soil degradation and a change in water quality. These soils are likely to affect land productivity and aquifer replenishment and will cause negative environmental and economic impacts. Thus, soil improvement techniques are needed. It is important to maintaining vegetative cover these soils and revegetation may be required.
    Type of Medium: Online Resource
    ISSN: 2354-0079
    Language: English
    Publisher: Walter de Gruyter GmbH
    Publication Date: 2020
    detail.hit.zdb_id: 2828382-X
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  • 9
    Online Resource
    Online Resource
    Elsevier BV ; 2021
    In:  Petroleum Exploration and Development Vol. 48, No. 3 ( 2021-06), p. 683-692
    In: Petroleum Exploration and Development, Elsevier BV, Vol. 48, No. 3 ( 2021-06), p. 683-692
    Type of Medium: Online Resource
    ISSN: 1876-3804
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2021
    detail.hit.zdb_id: 2471051-9
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  • 10
    Online Resource
    Online Resource
    Japan Agency for Marine-Earth Science and Technology ; 2012
    In:  JAMSTEC Report of Research and Development Vol. 15, No. 0 ( 2012), p. 1-11
    In: JAMSTEC Report of Research and Development, Japan Agency for Marine-Earth Science and Technology, Vol. 15, No. 0 ( 2012), p. 1-11
    Type of Medium: Online Resource
    ISSN: 1880-1153 , 2186-358X
    Language: English
    Publisher: Japan Agency for Marine-Earth Science and Technology
    Publication Date: 2012
    detail.hit.zdb_id: 2901958-8
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