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Berita Sedimentologi

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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 282 Documents

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Ophiolite Obduction on Leti Island, as Described By Molengraaff and Brouwer (1915): Implications for Age and Genesis Of Metamorphic Complexes in the Outer Banda Arc, Eastern Indonesia van Gorsel, J.T.
Berita Sedimentologi Vol 24, No 1 (2012)
Publisher : Ikatan Ahli Geologi Indonesia

Geology, rocks and fossils of Leti Island, NE of Timor, were described in great detail by Molengraaff et al. (1915). Folded Early-Middle Permian sediments and basic volcanics in the south of the island gradually become low-grade metamorphics to the North, with further increases in metamorphic grade towards a serpentinite massif in the north of the island. In today's plate tectonic terms this may be characterized as 'ophiolite obduction', i.e. metamorphism of continental crustal material in a subduction zone. The serpentinite massif is overlain by Latest Oligocene shallow marine limestone with reworked clasts and detritus of serpentinite and metamorphic rocks. These observations suggest that the age of the metamorphic-ophiolite complex on Leti island is post-Early Permian (and is therefore not Australian continental crust basement) and younger than latest Oligocene (i.e. too old to represent metamorphism connected with the Late Neogene Banda arc- NW Australian continent collision).Metamorphic complexes on nearby Timor and on small islands to the East may all have a similar origin, despite the wide range of published radiometric ages and proposed tectonic models (from Precambrian Australian continental basement to 'the world's youngest blueschist belt'). Many complexes are associated with ophiolitic rocks, overlie imbricated Permian-Triassic sediments and are overlain by an Upper Cretaceous- Lower Miocene 'Banda Terrane' succession (not always complete) that includes tropical carbonates, arc volcanics and unconformities, very similar to that of the Sundaland margin. These broad similarities suggest all or most of the metamorphic complexes may be parts of a single 'Timor-Tanimbar' metamorphic belt of Cretaceous age.If this interpretation of a single, extensive Cretaceous-age collisional/ subduction zone complex is correct, it follows that (1) this could not have taken place along the NW Australia passive margin, where it is today, and (2) if Permian-Triassic sediments and volcanics are indeed the protoliths of all metamorphic complexes, a microplate carrying these 'Gondwana sequence' sediments must already have separated from the Gondwana margin, probably in Jurassic time. This leads us back to the tectonic scenario that was prevalent around 1980 (Barber (1978, 1981, etc.), which shows most of Timor as a microcontinental sliver that rifted off the Sundaland margin in the Tertiary (should be ~Late Miocene-Pliocene time) during slab rollback/arc splitting that opened the South Banda Sea. It returned microcontinental material that had rifted off the Gondwana margin in the Jurassic ('Gondwana sequence'), then collided with the Sundaland margin in the Cretaceous, after which it developed its overprint of Late Cretaceous- Early Miocene arc volcanics, tropical carbonates, etc.

Application of Neural-network Technology in Analyzing Deep-water Depositional Elements Deddy Aditya Sebayang
Berita Sedimentologi Vol 18, No 1 (2003)
Publisher : Ikatan Ahli Geologi Indonesia

The introduction of neural-network technology in 3D seismic interpretation proves to be a powerful tool in constructing depositional elements in basin plain environment. The most known software that uses neural network technology to classify the seismic facies by imitating the human's brain work is Stratimagic. Its 'magic' requires a reference surface, interval thickness (window) and number of iteration as data inputs to create a facies map.The reference surface(s) is used as a reference to define the interval thickness. Interval thickness acts as a processing window that depends mostly on lithology complexity and the quality of the seismic data while the number of iteration defines how much trial-and-error processes are needed in search of a better correlation to the real traces. The result is a series of signal traces that represents the diversity of the signal shape over the seismic volume. In other word, Neural Network Technology trains itself actual trace shapes within a 3D seismic interval by constructing synthetic seismic traces.

Cover, Table of Contents, and Introduction to Volume Berita Sedimentologi
Berita Sedimentologi Vol 31, No 1 (2014)
Publisher : Ikatan Ahli Geologi Indonesia

Cover, Table of Contents, and Introduction to Volume

Depositional Events and Their Records - An Introduction G. Einsele; S.K. Chough; T. Shiki
Berita Sedimentologi Vol 7, No 1 (1998)
Publisher : Ikatan Ahli Geologi Indonesia

Event deposits of some lateral extent as defined here occur almost in all types of sedimentary basins. They reflect either locals, intra-basinal processes, or they are associated with regional or global mechanisms. Some types of event beds, such as sediment gravity flows, sandy and muddy turbidites, are common and usually well preserved. They make up large proportions of basin fills, whereas others (e.g., tsunami deposits and in-situ earthquake structures) appear to be less frequent or rare in the geological record. Volume, frequency, and facies of event deposits are controlled by several processes: pre-event sediment accumulation, triggering and transport mechanism, and mode of final deposition.

Isotopic reconstruction of Proboscidean habitats and diets on enigmatic island of Sulawesi Puspaningrum, Mika Rizki; Chivas, Allan R.; Kurniawan, Iwan; Wibowo, Unggul P.; Zaim, Yahdi; van den Bergh, Gerrit D.
Berita Sedimentologi Vol 47, No 3 (2021)
Publisher : Ikatan Ahli Geologi Indonesia

Sulawesi is known for its complex geological and biogeographic history, which is reflected in their extinct and extant faunal assemblage. Evidence of oldest terrestrial fauna in Sulawesi was found in the Early Pleistocene sediment and evolved since then. Despite being mostly isolated from the mainland Southeast Asia; four successive Proboscidean taxa have been found from the southern part of the island. The four taxa are: Stegoloxodon celebensis, Stegodon sompoensis, Stegodon sp. B, and cf. Palaeoloxodon namadicus, in which respective taxa are included in successive faunal stages. The aim of this research is to reconstruct the diet and palaeoenvironment of these Proboscidean taxa by incorporating stable isotope analysis with the fossil faunal record, geology, and stratigraphy. Stable carbon (δ13C) and oxygen (δ18O) isotope analysis were especially used in this study. Our result suggests that Stegoloxodon celebensis and Stegodon sompoensis were flexible feeders and were able to adapt to different niches, from closed canopy forest to open vegetation, while the diets of Stegodon sp. B, Celebochoerus heekereni and cf. Palaeoloxodon namadicus suggest that they were more specialized.

Sangatta Delta Evolution with an Updated Miocene Paleogeography Purnama A. Suandhi; A. Bachtiar; Prihatin T. Setyobudi; Endi Nurjadi; Andi Mardianza; B. Dody Harisasmita; M. Arifai; Dwi Hendro H. N
Berita Sedimentologi Vol 39, No 1 (2017)
Publisher : Ikatan Ahli Geologi Indonesia

The Sangatta Delta is one of significant deltas which developed during Miocene in the northern part of Kutai Basin. Significant hydrocarbons and coals have been produced from Middle – Lower Miocene fluvio-deltaic sediments along the onshore – offshore parts of the Lower Kutai Basin since 1970 until present. The Sangatta Delta’s architecture was already published since 1994 based on subsurface data around the Sangatta Field. However, information on stratigraphy and sedimentological model only covered the Middle – Lower Miocene sections and there were no publication of its complete stratigraphy succession for more than 15 years.Recently, many road accesses have been developed, connecting villages and districts around Kutai Timur Regency. Most of the roads cut across perpendicularly to stratigraphy strikes measured from surface outcrops, including Miocene Section. Integrated surface geological study by using continuous measurement sections along the road accesses was used in generating composite, Miocene stratigraphic columns, which display information of stratigraphy, facies succession and paleogeography of Miocene deposits. Evolution of Sangatta Delta was interpreted by using chronostratigraphy built from outcrops observation.The Sangatta Delta development was controlled by Rantau Pulung – Mangkupa paleohigh (Rantau Pulung Island), which is bound by NE-SW and N-S strike slip faults system called Bengalon – Batuampar Slip Faults (NE-SW) and Rantau Pulung – Himba Lestari Slip Faults (N-S). Those faults represent old basement faults that were reactivated several times during Neogene time and they controlled the accommodation space and structural development around the Sangatta Delta.The delta development started in Early Miocene when at least two fluvial deltaic parasequence sets prograded toward east. During that time, the Rantau Pulung island was an exposed area, surrounded by marine environment. The delta continued to develop and became larger during Middle – Late Miocene as regional inversion and uplift took place at Kuching High to the west of the delta. More than ten stacking fluvial deltaic parasequence sets have been identified from stratigraphic composite columns and they all show progradation toward east. The stratigraphy deposited by the Early – Late Miocene progradation cycles could become new exploration targets around the Sangatta area, especially deep Neogene target or deepwater plays related to deltaic environment in distal facies area.

Geology and Nickel-Laterite Weathering Deposit in the Southeast Arm of Sulawesi Suratman Suratman
Berita Sedimentologi Vol 14, No 1 (2000)
Publisher : Ikatan Ahli Geologi Indonesia

Nickel-laterite deposits are derived from ultrabasic bedrock after undergoing prolonged chemical erosion at a greater rate than mechanical erosion. In describing the origin of Ni-laterites, it is logical to proceed from a consideration of the bedrock type and their origin in order to define the occurrence and distribution in space and time, prior to determining favorable weathering environment and detail profiles of its mineralogical and chemical conditions.Principal occurrences of Ni-laterites in Sulawesi coincide with two northwest trending belts of ultrabasic rock and derived sediments. The first trend is the southwest belts from Sua-sua through Pomalaa and Torobulu to the island of Wawoni. The second trend is the northeast belt runs from Malili and Kolonodale at north end of the arm to Lasolo on the east coast.

New Look at the Origin of the Sumba Terrane: Multidisiplinary Approaches Satyana, Awang H.; Purwaningsih, Margaretha E. M.
Berita Sedimentologi Vol 25, No 1 (2012)
Publisher : Ikatan Ahli Geologi Indonesia

Sumba Island belongs to the Lesser Sunda Islands Group. Geologically, the island is located in a forearc setting in front of the Quaternary Sunda-Banda volcanic arcs, which comprise the islands of Bali-Lombok-Sumbawa-Flores-Alor and Wetar. Sumba Island is presently non-volcanic and is tectonically important since it is located at the border of subduction and collision zones. To the west of Sumba, oceanic crust of the Indian Ocean is being subducted beneath the Sunda Arc. To the east of Sumba, there is collision zone where Australian continental crust underthrusts Timor Island.Based on tectonic studies, Sumba has been considered as a micro-continent or continental fragment/ sliver which detached itself from its provenance and was transported to its present position as an exotic terrane. Gravity data show that Sumba has a gravity anomaly of +160 to +200 mgal and is underlain by continental crust with a thickness of 24 km.The pre-Tertiary basement of Sumba reveals faulting with rifted blocks. Overlying this are Late Cretaceous-Paleocene marine turbidites of the Lasipu Formation. This period is accompanied by two major calc-alkaline magmatic episodes, the Santonian-Campanian episode (86-77 Ma) and the Maastrichtian-Thanetian one (71-56 Ma). Overlying these are volcaniclastic and neritic sediments accompanied by volcanic rocks belonging to theLutetian-Rupelian Paumbapa Formation (42-31 Ma). The Neogene rocks are composed of widespread transgressive and turbiditic chalky sediments of the Kananggar/Sumba Formation, which contain reworked volcanic materials. Synsedimentary tectonism with normal faulting and largescale slumping occurred during the Neogene. The Quaternary rocks are coral reefs, uplifted to form terraces.

Ulasan Singkat Buku: Sedimentary Structures (edisi ke-2) Berita Sedimentologi
Berita Sedimentologi Vol 4, No 1 (1997)
Publisher : Ikatan Ahli Geologi Indonesia

Sedimentary Structures (edisi ke-2)Oleh J.D. Collinson and D.B. Thompson.Tahun penerbitan 1993 oleh Chapman and Hall207 halaman, 205 gambar, 24.5 x 18.8 cm, soft cover, index.

August Tobler, the Swiss Pioneer of South Sumatra Geological Mapping, 1900-1912 J.T. (Han) van Gorsel; Bernhard Gunzenhauser
Berita Sedimentologi Vol 47, No 1 (2021)
Publisher : Ikatan Ahli Geologi Indonesia

Dr. August Tobler was a well-known Swiss geologist, who, as one of the very first petroleum field geologists in the Netherlands Indies, did more than ten years of geological mapping in the tiger-infested jungles of South Sumatra. He first worked for the Koninklijke/Royal Dutch and Moeara Enim oil companies in South Sumatra from 1900 to 1904. This was followed by six more years of geological mapping in the Jambi basin, as the first non-Dutch geoscientist at the Dienst van het Mijnwezen (Geological Survey). His thoroughly documented monographs and geologic maps of his geological fieldwork in the Palembang and Jambi basins of South Sumatra, as well as the adjacent Barisan Mountains, set new standards for quality and detail.Much of the personal information on Dr. Tobler is from papers by Kugler (1930, 1963), Oppenoorth (1930), Stehlin (1931) and Hottinger (2013). This paper is one of the chapters from a new book that is being prepared by the first author, entitled Pioneers and Milestones of Indonesian Geology (~1820-1960).

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Editorial Address Forum Sedimentologiwan Indonesia (FOSI) Komisi Sedimentologi Ikatan Ahli Geologi Indonesia (IAGI) Jl. Ciledug Raya Kav. 109 Cipulir, Kebayoran Lama, Jakarta Selatan, Indonesia

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Minarwan

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Forum Sedimentologiwan Indonesia (FOSI) Komisi Sedimentologi Ikatan Ahli Geologi Indonesia (IAGI) Jl. Ciledug Raya Kav. 109 Cipulir, Kebayoran Lama, Jakarta Selatan, Indonesia

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