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All Journal BULLETIN OF THE MARINE GEOLOGY Jurnal Geologi Kelautan: Media Hasil Penelitian Geologi Kelautan
Albab, Ali
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Earth & Planetary Sciences

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IDENTIFIKASI PIPA BAWAH LAUT MENGGUNAKAN DATA GEOMAGNET, PERAIRAN BALIKPAPAN, KALIMANTAN TIMUR Subarsyah, ⠀; Albab, Ali
JURNAL GEOLOGI KELAUTAN Vol 20, No 2 (2022)
Publisher : Pusat Penelitian dan Pengembangan Geologi Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/jgk.20.2.2022.768

Abstract

Transmisi gas dari sumur produksi melalui pipa bawah laut menuju titik distribusi merupakan hal yang sangat penting. Kebutuhan akan gas alam yang sangat tinggi seringkali mendorong pemasangan jaringan pipa gas baru begitupun ketika terjadi gangguan terhadap jaringan pipa yang lama. Pemasangan jaringan pipa baru membutuhkan informasi mengenai lokasi jaringan pipa terpasang. Identifkasi jaringan pipa bawah laut dapat dilakukan dengan survei magnetometer dan menerapkan pengolahan data yang dapat mempermudah identifikasi, tahapan pengolahan data akan dilakukan pada rute pipa bawah laut di Perairan Balikpapan untuk mengidentifikasi keberadaan pipa bawah laut yang sudah terpasang. Metode pengolahan data dilakukan dengan analisis signal sehingga jalur pipa gas bawah laut dapat teridentifikasi dengan lebih baik. Data magnet di Perairan Balikpapan dapat mengidentifikasi setidaknya 4 (empat) jalur pipa gas bawah laut terpasang. Penggunaan metode analisis sinyal memberikan gambaran yang lebih jelas keberadaan pipa gas bawah laut.
GEOCHEMISTRY OF SEABED AND COASTAL SEDIMENTS IN LIMAU WATERS AREA Zulfikar, Muhammad; Saputro, Eko; Albab, Ali; Rahardiawan, Riza
BULLETIN OF THE MARINE GEOLOGY Vol 40, No 2 (2025)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/bomg.40.2.2025.953

Abstract

Sediment provenance and weathering history are used to understand sedimentary processes and to explore mineral potential in coastal–marine systems in the Limau Waters. Therefore, the characteristics of seabed and coastal sediments need to be determined. This study aims to identify the source rocks, paleoweathering signatures, and sediment maturity of both seabed and coastal sediments through a geochemical approach. A geochemical approach that integrates major oxide and rare earth element (REE) analyses, the paleoweathering, and sediment maturity indices, is used to identify the source rocks of these sediments. Major oxides elements were measured using X-ray fluorescence (XRF) and REE concentrations were determined using inductively coupled plasma - optical emission spectrometry (ICP-OES) and inductively coupled plasma optical - mass spectrometry (ICP-MS). Geochemical discrimination diagrams indicate that seabed sediments are mainly derived from intermediate to felsic igneous rocks with higher compositional maturity, whereas coastal sediments are influenced by mafic volcanic rocks and are comparatively immature in composition. Both sediment types exhibit weak chemical weathering (CIA < 70), suggesting limited alteration of young volcanic sources. The CIA–ICV relationships portray contrast sediment transport and depositional processes between the coastal and marine environments. This study is expected to provide a geochemical-based framework for provenance analysis and to support the development of insights for future marine mineral exploration in the Limau Waters area.
ACOUSTIC FACIES AROUND THE INTRUSIVE COMPLEX OF SALAHNAMA AND PANDANG ISLANDS, MALACCA STRAIT , S.Si., MT., Subarsyah; Albab, Ali; Zulivandama, Shaska Ramdhan; Saputro, Eko; Ali, Arif; Setiadi, Imam; Zulfikar, Muhammad; Nauval, Faris; Rahardiawan, Riza
BULLETIN OF THE MARINE GEOLOGY Vol 40, No 2 (2025)
Publisher : Marine Geological Institute of Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/bomg.40.2.2025.938

Abstract

Salahnama and Pandang Islands lie on the main range of the granite province; both islands are located in the Sunda Shelf, Malacca Straits. These islands are composed of intrusive rocks from Berhala. The rock’s existence will offer a significant contribution to the distribution of surface sediments in the surroundings. The sea dynamics and the geometry of the Malacca Strait will also have an impact on the seabed. Apart from that, global factors such as sea level changes will lead to transformation of the depositional environment and subsurface geology in the strait. Geological conditions of the seabed surface and subsurface can be understood and interpreted based on the acoustic characteristics and reflector patterns of a seismic section. Then, based on the acoustic character and reflector pattern, an acoustic facies can be defined. Seismic data measurements have been carried out around Salahnama and Pandang Islands in 2024. Based on the results of the seismic section, the acoustic facies in the study area are classified into 6 (six), which include AF I – AF VI. Seabed morphological features in the form of sand dunes were identified in the first acoustic facies (AF I); this feature is formed due to geometric aspects, surface currents, and bottom current's which may or may not be triggered by tidal vortices. Acoustic Facies II (AF II) is characterized by sandwave or ripple marks formed by strong seabed currents. AF III was formed after the Last Glacial Maximum (LGM) ended and the depositional environment returned to a shallow marine environment, characterized by a transparent pattern in the seismic section. The erosional truncation at the upper boundary of AF IV indicates a change in the depositional environment from shallow marine to coastal or terrestrial environments during the Last Glacial Maximum period. AF V is acoustic bedrock, and AF VI is characterized by a chaotic pattern, which is interpreted as granitic intrusive rocks.
Co-Authors , S.Si., MT., Subarsyah arif ali, arif Eko Saputro, Eko Imam Setiadi, Imam Muhammad Zulfikar Nauval, Faris Riza Rahardiawan Subarsyah, ⠀ Zulivandama, Shaska Ramdhan