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All Journal POSITRON JGE (Jurnal Geofisika Eksplorasi) Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir Journal of Geoscience, Engineering, Environment, and Technology Journal of Science and Applicative Technology
Natalia, Happy Christin
Engineering Geology, Institut Teknologi Sumatera, Jl. Terusah Ryacudu, Way Huwi,, Kabupaten Lampung Selatan, Lampung 35365, Indonesia.
Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Energy Engineering Environmental Science Materials Science & Nanotechnology Mechanical Engineering Physics Social Sciences

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Karakteristik Geokimia Basal Alkali Formasi Manamas di Sungai Bihati, Baun, Pulau Timor Angga Jati Widiatama; Lauti Dwita Santy; Happy Christin Natalia; Joko Wahyudiono; Rinaldi Ikhram
EKSPLORIUM Vol 42, No 1 (2021): Mei 2021
Publisher : Pusat Teknologi Bahan Galian Nuklir - BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2021.42.1.6205

Abstract

ABSTRAK Batuan beku Formasi Manamas di Sungai Bihati, Baun merupakan salah satu singkapan batuan beku di Pulau Timor yang belum banyak diteliti berdasarkan karakter geokimia. Penelitian ini bertujuan untuk mengetahui genesa dan proses yang terjadi pada batuan beku Formasi Manamas dalam kerangka tektonik yang terjadi di Pulau Timor berdasarkan analisis petrografi dan geokimia. Analisis geokimia dilakukan dengan menggunakan X-ray Fluorescence (XRF) dan Inductively Coupled Plasma-mass Spectrometery (ICP-MS) untuk mengetahui senyawa utama, unsur jejak, dan unsur tanah jarang. Batuan beku Formasi Manamas berupa intrusi basal dengan afinitas alkali yang menunjukkan pola pengayaan unsur tanah jarang yang identik dengan Ocean Island Basalt (OIB). Penelitian ini membuktikan adanya dua mekanisme pengayaan unsur yang berbeda yaitu fluid related enrichment yang berkaitan dengan aktifitas subduksi lempeng Samudra Hindia di bawah Busur Banda dan melt related enrichment yang diperkirakan berasal dari sisa lempeng Samudra Hindia yang patah yang masuk kedalam zona reservoir OIB. Kedua magma lalu bercampur dan mengalami underplating di bawah Busur Banda. ABSTRACT The igneous rock of Manamas Formation in the Bihati River, Baun is one of the igneous rock outcrops in Timor Island that has not been widely studied based on its geochemical characteristic. This study aims to determine the genesis and processes that occur in the igneous rocks of the Manamas Formation within tectonic framework of Timor Island based on petrographic and geochemical analysis. X-ray Fluorescence (XRF) and Inductively Coupled Plasma-mass Spectrometery (ICP-MS) were used to determine the major elements, trace elements, and rare earth elements. The igneous rock of the Manamas Formation is a basalt intrusion with an alkaline affinity which shown an enrichment pattern of rare earth elements identical to Ocean Island Basalt (OIB). This study proves the existence of two different mechanisms of elemental enrichment, fluid related enrichment which related to the subduction activity of the Indian Ocean plate under the Banda Arc and also melt related enrichment which originated from the broken Indian Ocean plate which enters the OIB reservoir zone. The two different magmas then mix and underplating beneath the Banda Arc.
Identifikasi Keberadaan Intrusi Air Laut pada Kawasan Pemukiman di Sekitar Pesisir Pantai Daerah Desa Sukajaya Lempasing Kecamatan Teluk Pandan Daniel Radityo; Alviyanda Alviyanda; Happy Christin Natalia; Ahmad Hamdani; Angga Ahya Huseina; Anjar Dwi Asterina Denhi; Rifqi Andi Naufal; Zayadah Zayadah
Journal of Science and Applicative Technology Vol 4 No 2 (2020): Journal of Science and Applicative Technology December Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v4i2.366

Abstract

Sukajaya Lempasing is one of the villages located in Teluk Pandan District, Pesawaran Regency, Lampung Province. Sukajaya Lempasing Village was chosen as a place for research because of its position on the east coast which is directly adjacent to Lampung Bay, of which its groundwater is suspected to be contaminated by seawater, causing the water to be brackish. Field observation, data collection, as well as lithology and air control are needed to see the geological and hydrogeological conditions of this area. Based on the physical and chemical parameters, the well of Hamlet 7 has groundwater and there is no indication of sea water intrusion because the area is very close to hills which may become a catchment area so that groundwater flows out to sea with high pressure. Based on the salinity, TDS, and conductivity values ​​obtained, the well that experienced seawater intrusion was the AJR3 well because it is located closest to the coastline and is supported by an alluvial sediment aquifer that has moderate to high aquifer productivity. The quality of water based on physical parameter data from wells in Hamlet 1, Hamlet 7 and sample AJR4 Hamlet 3 is classified as clean and suitable for daily use. The lithology in the form of alluvial deposits allows seawater intrusion, especially in areas close to the shoreline such as the AJR3 well.
Potensi Geodiversity di Sekitar Kawasan Anak Krakatau-Way Kambas, Provinsi Lampung, Sebagai Kandidat Geopark Indonesia Happy Christin Natalia; Danni Gathot Harbowo; Rinaldi Ikhram
Journal of Science and Applicative Technology Vol 5 No 1 (2021): Journal of Science and Applicative Technology June Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v5i1.318

Abstract

The global significance of Krakatau Volcanic Complex and Way Kambas National Park is the best potential areas to be developed as part of a world heritage, particularly as UNESCO Global Geopark. Both of these objects are in the Lampung Province, Indonesia. Soon, it is necessary to identify and make an inventory of key sites that could become the theme of the area. The study of geodiversity and scientific valuation was carried out which referred to the Technical Guidelines for the Assessment of Indonesia Geological Heritage Resources, 2019. Based on these studies and assessments, there are 14 key sites to represent for Geopark Krakatau-Way Kambas themes. These sites are closely related to the evolution of tectonic activity in the Southern Sumatera as well as the dynamics of magmatism and paleovolcanism that have occurred since the Mesozoic which has signification in human history as world heritage.
EVOLUSI TUBUH GUNUNGAPI DAN IMPLIKASI STRUKTUR GEOLOGI DI GUNUNG PESAWARAN-BETUNG, LAMPUNG Happy Christin Natalia; Anjar Dwi Asterina Denhi
JGE (Jurnal Geofisika Eksplorasi) Vol 9, No 1 (2023)
Publisher : Engineering Faculty Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jge.v9i1.253

Abstract

Provinsi Lampung didominasi oleh produk vulkanik yang membentuk berbagai pola morfologi, baik itu morfologi dataran, perbukitan, hingga kaldera. Aktivitas vulkanik di Provinsi Lampung erat kaitannya dengan aktivitas tektonik yang berkembang sejak Miosen. Namun, belum ada penelitian terperinci terkait aktivitas vulkanisme tersebut. Tujuan penelitian ini adalah untuk menentukan evolusi tubuh gunungapi strato di Gunung Pesawaran dan Betung serta menentukan implikasi struktur yang mempengaruhi sebaran produk gunungapi. Penelitian ini menggabungkan data analisis morfologi areal dan linear berdasarkan Digital Elevation Model (DEM) untuk menentukan evolusi tubuh gunungapi. Data area dan linear daerah penelitian dianalisis menggunakan peta topografi, hillshade, data kemiringan lereng, dan kelurusan yang diolah menggunakan perangkat lunak ArcGIS 10.5. Berdasarkan analisis area dan analisis linear terdapat empat domain area dan dua pola kelurusan yang ditunjukkan oleh perbedaan tekstur, morfologi, and produk vulkanik. Daerah penelitian memiliki morfologi kaldera purba yang dikenal dengan Kaldera Gebang, bagian dari domain 1, di bagian timur daerah penelitian, dataran vulkanik di bagian utara dan merupakan bagian dari domain 2, dan tubuh gunungapi strato tipe C, yaitu Gunung Pesawaran (domain 3) dan Gunung Betung (domain 4) yang menempati bagian tengah daerah penelitian. Dua pola kelurusan menunjukkan arah baratlaut-tenggara dan baratdaya-timurlaut. Kedua pola kelurusan ini menunjukkan bahwa perkembangan patahan dan morfologi gunungapi daerah penelitian dipengaruhi oleh aktivitas tektonik dan vulkanisme sejak umur Miosen.
Basaltic Lava Characteristic in Goa Pandan Area, Sukadana, East Lampung: Inferences from Stratigraphy and Petrography Analysis Happy Christin Natalia Sirait; Bilal Al Farishi; Nono Agus Santoso; Andreas Maruli Pakpahan; Hissy Ijitiha Sari; Angga Jati Widiyatama; Risky Martin Antosia
Journal of Geoscience, Engineering, Environment, and Technology Vol. 8 No. 2 (2023): JGEET Vol 08 No 02 : June (2023)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2023.8.2.12118

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.
Petrology and Mineralogy of Metamorphic Rocks in The Pringsewu District, Lampung Province, Indonesia Happy Christin Natalia Sirait; Veni Dewinta
Journal of Geoscience, Engineering, Environment, and Technology Vol. 8 No. 3 (2023): JGEET Vol 08 No 03 : September (2023)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2023.8.3.11347

Abstract

The origin of metamorphic rock is greatly influenced by the temperature and pressure changes in every tectonic setting, especially in active subduction margins. One of the wide outcrops of metamorphic rock occurs in the Pringsewu District, Lampung, and it is a part of the Palaeozoic Gunung Kasih Complex. The presence of metamorphic rocks in Pringsewu has raised several questions and debates for some time due to the lack of research and field evidence found in this area, especially, since the origin of metamorphic rock in Lampung has been rarely studied. This research aims to determine the metamorphic rock facies and the tectonic setting underlying the formation of metamorphic rocks in the study area. Petrographic analysis on 19 thin-section samples shows that metamorphic rock in the research area can be divided into two regions i.e., western and eastern regions. The Eastern part is characterized by muscovite-epidote schist and greenschist which consist of quartz, muscovite, actinolite, epidote, and garnet as index minerals. Whereas the western part is characterized by quartzite and biotite-epidote schist that consist of quartz, biotite, and muscovite. Based on the mineral index, metamorphic rock’s protoliths are pelitic rock, mafic rock, and quartz-feldspathic sandstone. The metamorphic rock zonation shows the created temperature is from 280-550oC. The foliation structure such as schistose and porphyroblastic texture in the whole rocks sample indicated that metamorphic rocks are created in medium-grade metamorphism and are characterized by the greenschist facies to epidote-amphibolite facies. The abundance of quartz, k-feldspar, and labradorite minerals show that metamorphic rocks came from the microcontinent which was caused by a collision between the intra-oceanic Woyla plate and West Sumatra microcontinent in the Cretaceous. Indications of tectonic activity that create the lithology in Lampung Province need more geological study, especially to determine the absolute age of the metamorphic rock.
Beneath the Surface: Identifying Subsurface Caves in "Gua Pandan" Using Integrated Electrical Profiling Method Antosia, Risky Martin; Akbar, Hendra Hidayat; Santoso, Nono Agus; Putri, Intan Andriani; Farishi, Bilal Al; Natalia, Happy Christin
POSITRON Vol 13, No 1 (2023): Vol. 13 No. 1 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/positron.v13i1.63558

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.
Co-Authors Ahmad Hamdani Akbar, Hendra Hidayat Alviyanda Alviyanda Andreas Maruli Pakpahan Angga Ahya Huseina Angga Jati Widiatama Angga Jati Widiyatama Anjar Dwi Asterina Denhi Anjar Dwi Asterina Denhi Antosia, Risky Martin Bilal Al Farishi Daniel Radityo Danni Gathot Harbowo Farishi, Bilal Al Hissy Ijitiha Sari Joko Wahyudiono Lauti Dwita Santy Nono Agus Santoso Putri, Intan Andriani Rifqi Andi Naufal Rinaldi Ikhram Rinaldi Ikhram Santoso, Nono Agus Veni Dewinta Zayadah Zayadah