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Berita Sedimentologi
Published by Forum Sedimentologiwan Indonesia
ISSN : 08539413     EISSN : 2807274X     DOI : https://doi.org/10.51835/bsed
Core Subject : Science,
Earth & Planetary Sciences
BERITA SEDIMENTOLOGI aims to disseminate knowledge on the field of sedimentary geology to its readers. The journal welcomes contributions in the form of original research articles, review articles, short communications and discussions and replies. Occasionally, Berita Sedimentologi also includes field trip reports and book reviews, which are published only after going through peer-review processes. The main geographical areas of interest are Indonesia and SE Asia, however contribution from the rest of the world is also welcome. Berita Sedimentologi covers broad topics within sedimentary geology, particularly on depositional processes and their records in the rocks, petrology, sedimentology and stratigraphy of both siliciclastic and carbonate rocks; sequence stratigraphy, paleontology, biostratigraphy and sedimentary geochemistry. The journal also accepts articles on interdisciplinary research in sedimentary basin analysis, including large-scale basin geodynamics processes, mechanism of sedimentary basin formation, earth surface processes, sediment routing systems, petroleum geoscience and applied sedimentary geology analysis for mining and engineering geology.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Geologi
Articles 5 Documents
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Search results for , issue "vol. 52 no. 1 (2026)" : 5 Documents clear
Paleogene Development of Sundaland R. P. Koesoemadinata
Berita Sedimentologi Vol. 52 No. 1 (2026)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51835/bsed.2026.52.1.518

Abstract

The Paleogene tectonostratigraphy of Sundaland can be subdivided into Pre-rift (Pre- Cenozoic and Paleocene) and Syn-rift (Eocene and Oligocene) megasequences. The Pre-rift Paleogene, represented mainly by Paleocene, was the time of non-deposition and denudation practically over the whole Sundaland, except at a few places along its peripheries, where arc volcanism took place. These volcanics are the Jatibarang and the Cikotok Volcanics in western Java, with its respective associated subduction zones at Loh Ulo and Ciletuh. In Sumatra, they are the Kikim Tuffs (South Sumatra) and the Brueh Volcanics (North Sumatra) and its associated back-arc and shelf basins (carbonate platform). At this time, the Sundaland was tectonically stable. The Syn-rift Paleogene consists of Eocene and Oligocene deposits, mainly of terrestrial facies (fluviatile and lacustrine), partly with marine incursions, such as in the North Sumatra and South Sumatra. Sedimentation was restricted to narrow rift-valleys grabens and half-grabens surrounding the core of the Sunda Shield in SW Kalimantan. The bounding faults show a definite pattern, anti-clock-wise from N Sumatra-NW Java, NW-SE and N-S; Eastern Java E-W and NNE-SSW; SE Kalimantan WNW-ESE; E. Kalimantan NNW-SSE, and Natuna basin: NE-SW and NW-SE. Tectonically, Sundaland was in an extensional regime during most of the Paleogene. In its western part, Sundaland is characterized by trans-tensional tectonics: the NW-SE trending right-lateral Mentawai Trans-current Fault (transform fault) formed a plate-boundary with corresponding Padang Island Fault forming a couple to form the N-S and NW-SE trending grabens.  In the east, the West Sulawesi micro-continent rifted away to form the Makassar Strait basins, initiating NNE-SSW trending grabens and half-grabens with syn-rift deposition. To the south, the presence of a subduction is questionable, as no volcanic rocks of either Eocene and Oligocene age has been radiometrically identified. At the continental edge, however, at least in western Java, a prograding depositional sequence of deltaic to shallow marine deposits overlain by reefal limestones have been identified similar to a passive margin depositional sequence. To the north in west central Kalimantan arc volcanism indicates the presence of fore-arc basins.
Geotourism Sites in Ciwidey Area, West Java: Kawah Putih and Situ Patengan (Patenggang) Junida R. Purba; Herman Darman
Berita Sedimentologi Vol. 52 No. 1 (2026)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51835/bsed.2026.52.1.528

Abstract

Ciwidey's Patuha volcanic highland hosts world-class geotourism sites—Kawah Putih and Situ Patengan—that combine active volcanic processes, high-altitude lacustrine systems, and cultural significance. This study develops geotourism strategies integrating geological education with visitor experiences through interpretive frameworks, fostering both geological literacy and sustainable local economic development. Methods are site observation, literature review, and satellite imagery analysis. Kawah Putih's extremely acidic crater lake (pH <2) exhibits a characteristic whitish-green color from dissolved volcanic gases, primarily sulfur and chlorine compounds rising from subsurface magma. Situ Patengan, a mature caldera lake at 1600 masl with emergent basaltic lava exposures, represents Early Pleistocene volcanic evolution.
Late Neogene Inversion and Subduction Initiation in the SE Sundaland: Insights from Seismic Observation of Regional Reverse and Back-thrust Faults from East Java to Wetar, Indonesia RM Iman Argakoesoemah
Berita Sedimentologi Vol. 52 No. 1 (2026)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51835/bsed.2026.52.1.529

Abstract

The Late Neogene tectonics in East Java region have led to significant geological deformations. For example, the regional structures of the Cepu-to-Central High inversion and Baribis-to-Wetar back-thrust fault are the result of the Australian Oceanic Plate subducting beneath southeast of the Cretaceous Sundaland in an orthogonal direction. These inversion structures and back-thrust faults are prominent and continuously active in onshore East Java in the west and further east. The west-east regional structure of the Cepu-to-Central High inverted graben remains attractive for hydrocarbon exploration and development in Indonesia. The region has been one of the focal points in the East Java Basin and has two well-known proven petroleum systems. Oil and gas fields have been continuously discovered until very recently in both the Eocene-to-Miocene thermogenic and Pliocene-to-Pleistocene biogenic plays. Hydrocarbon plays in the region have been significantly improved and added since the first oil was discovered by the Dutch in pre-World War II in-line with the use of new exploration concepts and techniques, as well as drilling technology. The extent of the Baribis-to-Wetar back-thrust fault was seismically defined in onshore East Java towards offshore Wetar. The 2D seismic interpretation indicated that the segment of the Kendeng-Bali back-thrust fault has a low-angle blind-thrust fault system. Towards the east, in the Lombok-Flores-Wetar segment, the blind-thrust fault has developed its thrust style, and the fault thrust-tip line has broken all the way to the sea floor. At this point, the beginning of Flores intra-oceanic subduction initiation might have occurred in the post-Early Pleistocene to form a Flores nascent trench. Along this back-thrust segment, the central to east Sunda Arc is seismically very active and devastating.
Elements of Paleogene Geology of Indonesia – Part 1. History of Discovery and Biostratigraphy J.T. (Han) van Gorsel
Berita Sedimentologi Vol. 52 No. 1 (2026)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51835/bsed.2026.52.1.532

Abstract

This introductory paper provides a comprehensive overview of the Paleogene sediments and fossils of Indonesia, synthesizing over 170 years of geological research to guide future stratigraphic studies. While less extensively studied than Neogene sequences due to fewer outcrops, fewer well penetrations, and lower economic hydrocarbon discoveries, Paleogene successions (66–23 Ma) offer critical insights into distinct paleoclimatic and paleotectonic regimes. The paper focuses on the history of discovery, biostratigraphic concepts, and the distinct characteristics of three regional paleotectonic domains (Eurasian, Gondwanan, and SW Pacific) that amalgamated into a complex mosaic of sedimentary basins. This paper discusses first discoveries of Paleogene deposits in Indonesia, Paleogene biostratigraphy and the terrestrial world of Paleogene sequence.
Rethinking the Paleogene Tectonostratigraphy and Petroleum Systems of Indonesia: Moving Beyond Simplistic Basin Models Ian Longley
Berita Sedimentologi Vol. 52 No. 1 (2026)
Publisher : Ikatan Ahli Geologi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51835/bsed.2026.52.1.540

Abstract

A pervasive paradigm in Southeast Asian geosciences posits a uniform, synchronous tripartite sequence for Paleogene basin evolution: regional rifting, thermal sag, and middle-to-late Miocene structural inversion. However, critical evaluation of hard chronostratigraphic and structural data reveals this rigid model is overly simplistic and frequently inaccurate. Instead, the Paleogene basins of Indonesia exhibit highly localized, diachronous, and episodic tectonic events that cannot be explained by regional generalizations like the rigid "Tapponnier Extrusion Model." This paper deconstructs these generalized assumptions by analysing three distinct tectonostratigraphic settings: non-marine syn-rifts (e.g., Central and South Sumatra) characterized by episodic extension and poor palynological age control; marine syn-rifts (e.g., East Java) where early marine incursions provide high-confidence biostratigraphic dating and robust seals; and mixed syn-rift/sag non-marine sections (e.g., West Natuna and Malay Basins) where a massive post-rift lacustrine sag sequence hosts the primary petroleum systems. Regional data demonstrates that tectonic initiation was highly diachronous, spanning from the Middle Eocene to the Miocene, while structural records preserve multiple, independent compressional phases dating back to the Early Oligocene. Ultimately, true chronostratigraphic control remains weak across non-marine Paleogene intervals in Western Indonesia due to a reliance on long-range data. To reduce exploration risk and accurately assess petroleum systems, geoscientists must abandon generic, synchronized structural templates. Instead, exploration strategies must adopt rigorous, data-driven frameworks supported by localized mapping of distinct rifts, sags, and multi-phase structural inversions.

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