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All Journal Jurnal Geologi dan Sumberdaya Mineral (Journal of Geology and Mineral Resources) BULLETIN OF THE MARINE GEOLOGY Jurnal Geologi Kelautan: Media Hasil Penelitian Geologi Kelautan
arif ali, arif
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Earth & Planetary Sciences Education Energy Engineering Environmental Science

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INITIAL STUDIES OF THE MARINE GEOPHYSICAL SURVEY IN THE OFFSHORE WAIGEO, WEST PAPUA Kusnida, Dida; Subarsyah, Subarsyah; Saputro, Eko; ali, arif
Jurnal Geologi dan Sumberdaya Mineral Vol 17, No 3 (2016): Jurnal Geologi dan Sumberdaya Mineral
Publisher : Pusat Survei Geologi

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (8053.425 KB)

Abstract

The offshore northern Waigeo situated and evolved within the obliquely converging of the Australian and Pacific plates boundary zone and  bound by an active left-lateral transform fault of the Sorong Fault Zone (SFZ) in the southern part. In general the Waigeo waters characterized by +200 nT to -150 nT of total magnetic intensities which indicate that the study area possibly overlain by a homogenous rock of oceanic origin in the form of highs (terranes) and lows (basins).  Seismic data indicate that the morphology of the study area relatively steep due to the tectonic contact boundary between island-terranes of Waigeo and between Ayu islands and Pacific Oceanic crust. This tectonic contact boundaries characterized by the present of Waigeo Trough that extends southeast-northwest direction. Seismic data reveal about 1000 meters thick of acoustically chaotic to laminated, indicate fine-grained sediments of slumps at Waigeo Trough slope and trough floor, and about 1500 meters thick of pelagic sediments at the Ayu Trough.
ANALISIS GEOKIMIA SEDIMEN DASAR LAUT PERAIRAN TELUK BONE BAGIAN UTARA, SULAWESI Saputro, Eko; Ali, Arif; Yulianah, Yuli
JURNAL GEOLOGI KELAUTAN Vol 21, No 2 (2023)
Publisher : Pusat Penelitian dan Pengembangan Geologi Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32693/jgk.21.2.2023.821

Abstract

Analisis geokimia sedimen dasar laut perairan Teluk Bone bagian utara dilakukan untuk mengetahui rona awal sebaran dan kandungan geokimia pada sedimen dasar laut perairan ini. Analisis granulometri yang dilakukan pada sedimen dasar laut menunjukkan dominasi lanau dan lanau pasiran. Hasil analisis geokimia unsur utama menunjukkan bahwa SiO2 (38,13%), Al2O3 (14,25%) dan CaO (11,80%) merupakan senyawa utama yang paling tinggi kandungannya. Secara umum, prosentase sebaran senyawa utama tersebut semakin berkurang seiring bertambahnya kedalaman batimetri, serta penyebarannya sangat dipengaruhi oleh banyak-sedikitnya sedimen fraksi halus. Unsur logam tertinggi pada perairan Teluk Bone ini yaitu Fe, Pb dan Zn dengan komposisi rata-rata ketiganya bernilai 46.134,35 ppm, 90 ppm dan 80,13 ppm. Pada umumnya sebaran kandungan unsur logam berasal dari daerah dekat darat, dan berkurang kandungannya seiring bertambahnya kedalaman batimetri. Diagram hubungan antara unsur logam dengan ukuran rata-rata butir sedimen menunjukkan bahwa semakin halus nilai ukuran butir maka semakin tinggi kandungan unsur logam di dalamnya.
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 Albab, Ali Dida Kusnida Eko Saputro, Eko Imam Setiadi, Imam Muhammad Zulfikar Nauval, Faris Riza Rahardiawan Subarsyah Subarsyah Yulianah, Yuli Zulivandama, Shaska Ramdhan