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  • 1
    In: Journal of Geoscience, Engineering, Environment, and Technology, UIR Press, Vol. 8, No. 2 ( 2023-06-23), p. 112-122
    Abstract: The presence of extensive basalt formations in East Lampung has its own attractions in the field of geology, particularly the presence of Goa Pandan as a lava cave and tourist attraction in East Lampung. The presence of basalt lava in the southern part of the South Sumatra Basin has drawn attention to the presence of this lava, but detailed research on the characteristics of the lava and its formation process is still very rare. This study aims to determine the eruption period of the basalt lava and magma evolution process based on the correlation between lava stratigraphy and petrography analysis. Field observations show a lava sequence that forms Goa Pandan. Each lava sequence is characterized by autobreccia and vesicular structures on the surface. In addition, the presence of columnar joints, sheeting joints, massive lava, and other additional structures indicate the characteristics of low-viscosity basalt lava. The presence of mineral structures and abundance under the microscope clearly shows the magma formation process when basalt lava flowed on the surface. Resorption-overgrowth of plagioclase and pyroxene minerals indicates an open system when basalt lava flowed on the surface. In addition, the presence of zoning and patching in plagioclase minerals indicates that magma variability is influenced by temperature. The documentation of this lava stratigraphy can serve as a basis for further understanding of magma characteristics and formation processes. There is still much geological work that can be done in the research area to get a detailed picture of the evolution process of magma and the presence of basalt lava in this area.
    Type of Medium: Online Resource
    ISSN: 2541-5794 , 2503-216X
    Language: Unknown
    Publisher: UIR Press
    Publication Date: 2023
    detail.hit.zdb_id: 3069706-2
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  • 2
    Online Resource
    Online Resource
    Institute of Research and Community Services Diponegoro University (LPPM UNDIP) ; 2020
    In:  Elipsoida : Jurnal Geodesi dan Geomatika Vol. 3, No. 01 ( 2020-07-04), p. 30-37
    In: Elipsoida : Jurnal Geodesi dan Geomatika, Institute of Research and Community Services Diponegoro University (LPPM UNDIP), Vol. 3, No. 01 ( 2020-07-04), p. 30-37
    Abstract: Kota Bandar Lampung memiliki topografi yang cukup beragam berupa lembah maupun punggungan bukit, dalam perkembangannya banyak kawasan pemukiman yang tersebar diantara perbukitan. Bencana longsor merupakan salah satu bencana yang sering terjadi di Indonesia. Perlu adanya kajian daerah rawan longsor beserta mitigasi bencana secara spesifik yang menjadi langkah konkrit dalam mengurangi angka korban jiwa maupun materi. Banyak faktor yang mempengaruhi rawan bencana longsor, yaitu: tingkat kemiringan dari kelerengan, tutupan lahan, jenis batuan dan tanah, serta didukung dengan data kejadian sebelumnya. Gambaran permukaan bumi khususnya daerah rawan longsor dapat direpresentasikan dalam peta, diawali dengan disusunnya dataset fundamental berdasarkan parameter yang berpengaruh kejadian longsor. Setiap parameter yang mempengaruhi kejadian longsor yang digunakan memiliki besar bobot yang berbeda dan terangkum dalam metode tumpang susun (Overlay). Meninjau area rawan di Kota Bandar Lampung terdapat sisa endapan gunungapi menghasilkan geomorfologi bukit terjal dimana penyusun batuannya adalah tuff dan breksi, yang kini bisa diamati di Kota Bandar Lampung, diantaranya adalah Bukit Sulah Sukarame, Bukit Koga Kedaton, Bukit Kaliawi dan Bukit Randu Tanjungkarang. Selain itu, terdapatnya banyak sesar yang berarah NW-SW sejajar orientasi Teluk Lampung, beberapa bukit di sekitarnya memiliki morfologi dengan curam. Batuan penyusunnya pun memiliki banyak rekahan, sehingga cenderung menjadikan lereng menjadi tidak stabil. Inilah yang membuat beberapa daerah di Kota Bandar Lampung rawan terjadi longsor.
    Type of Medium: Online Resource
    ISSN: 2621-9883 , 2621-8062
    Language: id
    Publisher: Institute of Research and Community Services Diponegoro University (LPPM UNDIP)
    Publication Date: 2020
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  • 3
    Online Resource
    Online Resource
    Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Lampung ; 2022
    In:  JGE (Jurnal Geofisika Eksplorasi) Vol. 8, No. 2 ( 2022-07-25), p. 127-136
    In: JGE (Jurnal Geofisika Eksplorasi), Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Lampung, Vol. 8, No. 2 ( 2022-07-25), p. 127-136
    Abstract: Batuan granitoid di Provinsi Lampung dapat ditemukan di peta geologi regional lembar Kota Agung dan Lembar Tanjungkarang. Masih sedikitnya penelitian tentang batuan granitoid Formasi Granit Kapur di Lampung mendasari penelitian ini. Tujuan penelitian adalah untuk mengidentifikasi jenis batuan granitoid dan melihat komposisi mineral batuan granitoid Formasi Granit Kapur. Metode yang digunakan adalah observasi lapangan untuk deskripsi petrologi dan pengambilan sampel batuan dan dengan metode pengamatan petrografi. Dari hasil observasi lapangan didapatkan 3 jenis batuan granitoid di lokasi penelitian dengan warna, komposisi mineral dan ukuran kristal yang berbeda, 3 batuan tersebut adalah Tonalit, Granodiorit dan Monzogranit, komposisi mineral utama dari batuan granitoid di lokasi penelitian antara lain, plagioklas, potassium feldspar, kuarsa, hornblende dan biotit, dengan komposisi mineral sekunder antara lain klorit, apatit, muskovit, titanit, turmalin dan opak. Dari hasil penelitian dapat diinterpretasikan jika batuan granitoid di lokasi penelitian berasal dari satu magma yang sama dan hasil proses diferensiasi magma dimana tonalit membeku terlebih dulu dan monzogranit yang memiliki ukuran kristal paling besar dan diinterpretasikan merupakan hasil kristalisasi di tahap akhir dari pembekuan magma. Dari data kelimpahan mineral dapat diklasifikasikan jika batuan granitoid di daerah penelitian merupakan tipe KCG (K-rich and K-feldspar porphyritic Calc-alkaline Granitoids).
    Type of Medium: Online Resource
    ISSN: 2685-6182 , 2356-1599
    Language: Unknown
    Publisher: Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Lampung
    Publication Date: 2022
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  • 4
    Online Resource
    Online Resource
    Universitas Negeri Padang ; 2019
    In:  Jurnal Pendidikan Teknologi Kejuruan Vol. 2, No. 4 ( 2019-11-27), p. 111-116
    In: Jurnal Pendidikan Teknologi Kejuruan, Universitas Negeri Padang, Vol. 2, No. 4 ( 2019-11-27), p. 111-116
    Abstract: Air bersih merupakan kebutuhan manusia dalam suatu komunitas. Kebutuhan air bersih dapat diambil dari air bawah permukaan melalui proses pemompaan. Upaya mendapatkan air bersih yang memiliki keberlanjutan baik dapat dilakukan dengan mengetahui arah aliran akuifer. Arah aliran akuifer dapat diketahui melalui pemodelan bawah permukaan. Penelitian ini menggunakan metode geolistrik dalam memodelkan lapisan di bawah permukaan guna mengetahui posisi akuifer. Berdasarkan model bawah permukaan, kedalaman rata-rata akuifer antara 30-100 meter. Model lapisan bawah permukaan menunjukkan jenis akuifer tertekan dengan lapisan lempung sebagai batas atas dan bawah akuifer. Air bawah permukaan diperkirakan memiliki arah aliran dari Timur ke Barat pada akuifer tertekan.
    Type of Medium: Online Resource
    ISSN: 2621-1548 , 2621-3273
    Language: Unknown
    Publisher: Universitas Negeri Padang
    Publication Date: 2019
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  • 5
    Online Resource
    Online Resource
    IOP Publishing ; 2019
    In:  IOP Conference Series: Earth and Environmental Science Vol. 258 ( 2019-05-10), p. 012022-
    In: IOP Conference Series: Earth and Environmental Science, IOP Publishing, Vol. 258 ( 2019-05-10), p. 012022-
    Type of Medium: Online Resource
    ISSN: 1755-1315
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 2434538-6
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  • 6
    Online Resource
    Online Resource
    Universitas Negeri Padang ; 2019
    In:  JURNAL PENDIDIKAN TEKNOLOGI KEJURUAN Vol. 2, No. 4 ( 2019-11-30), p. 111-116
    In: JURNAL PENDIDIKAN TEKNOLOGI KEJURUAN, Universitas Negeri Padang, Vol. 2, No. 4 ( 2019-11-30), p. 111-116
    Abstract: Cean water is needed in a human community. The need for clean water can be taken from subsurface water through a pumping process. Efforts to get clean water that has sustainability can be done by knowing the direction of the aquifer flow. The direction of the aquifer flow can be known through subsurface modeling. This study uses the geoelectric method in modeling the subsurface layer to determine the position of the aquifer. Based on the subsurface model, the average depth of an aquifer is between 30-100 meters. The subsurface model shows the type of aquifer depressed with a clay layer as the upper and lower limits of the aquifer. The subsurface water is estimated to have a flow direction from East to West in a confined aquifer.
    Type of Medium: Online Resource
    ISSN: 2621-1548 , 2621-3273
    Language: Unknown
    Publisher: Universitas Negeri Padang
    Publication Date: 2019
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  • 7
    Online Resource
    Online Resource
    UIR Press ; 2019
    In:  Journal of Geoscience, Engineering, Environment, and Technology Vol. 4, No. 3 ( 2019-09-30), p. 178-
    In: Journal of Geoscience, Engineering, Environment, and Technology, UIR Press, Vol. 4, No. 3 ( 2019-09-30), p. 178-
    Abstract: Natar Hot Spring is one of the geothermal manifestations that is located in Lampung Province, Indonesia. About 6 km to the east, another hot spring appears with temperature around 40°C with neutral pH called Cisarua Hot Spring. The Natar Hot Spring itself having temperature 47-54°C with 6.23 pH. Based on the geologic map, the appearance of these hot spring is caused by Lampung-Panjang Fault which trending northwest-southeast. Morphology of the research area is showing a flat terrain topography which composed of Quaternary volcanic rock and metamorphic rock in the basement. The nearest volcano that expected to be the heat source of the geothermal system is the Quaternary extinct volcano called Mt. Betung which is located about 15 km to the southwest. The aim of the study is to analyze the geochemistry of the manifestations and calculate the reservoir temperature. Geochemistry analysis result shows both manifestations are bicarbonate which is formed as a steam-heated water or steam condensates. Geothermometer calculation shows that the geothermal reservoir has temperature 150-160°C with approximately 300 m in depth. All manifestations are originated from meteoric water according to stable isotope analysis D and δ18O data and interacting with carbonate-metamorphic rock beneath the surface based on 13C isotope value. A further geophysics study is needed to determine where the heat comes from.
    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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  • 8
    In: POSITRON, Tanjungpura University, Vol. 13, No. 1 ( 2023-05-31), p. 31-
    Abstract: One of the geopark tourism areas in East Lampung Regency, "Gua Pandan," has run into rock subsidence on the surface. As part of the subsidence prevention, indirect electrical methods between resistivity and chargeability profiling were applied to identify the presence of a subsurface cave in the study area. Two measurement lines were carried out with Wenner Alpha and Wenner Schlumberger arrays. Because the depth target is shallow (approximately 10 m) and to obtain a better resolution, each line has a stretch length of 70 m and 2 m electrode spacing. A line was measured over a known underground cave to produce a desired outcome, and the other was in an area with no cavities. Based on the results from each profile of resistivity and chargeability, an air-filled target has a value of over 5,000  and under 6 ms, respectively. Then, integrated processing of both methods generated a metal factor (MF) profile to view the presence and estimated shape of the cave/ cavities. The result represents that an MF value under 1.5 ms/Ωm is a cavity, and solid rock is over 1.5 ms/Ωm. Also, the MF level from both configurations delineates a similar section. However, a modest difference occurs in estimating the cavity shape geometry,  for Wenner Apha and  for Wenner Schlumberger. Furthermore, this study can be an initial step in safety assessment in the area.
    Type of Medium: Online Resource
    ISSN: 2549-936X , 2301-4970
    Language: Unknown
    Publisher: Tanjungpura University
    Publication Date: 2023
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  • 9
    Online Resource
    Online Resource
    IOP Publishing ; 2019
    In:  IOP Conference Series: Earth and Environmental Science Vol. 258 ( 2019-05-10), p. 012036-
    In: IOP Conference Series: Earth and Environmental Science, IOP Publishing, Vol. 258 ( 2019-05-10), p. 012036-
    Type of Medium: Online Resource
    ISSN: 1755-1315
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 2434538-6
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