Contribution to the Geological Knowledge of South West Java

Baumann, Paul; Genevraye, Patrick De; Samuel, Luki; Mudjito,; Sajekti, Sri

doi:10.29118/ipa.143.105.108

Cited by 7 publications

(7 citation statements)

References 2 publications

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“…The Rajamandala Formation includes shallow-marine algal, reefal and reworked reefal limestones with abundant shell, coral and foraminiferal material of Late Oligocene to Early Miocene age (Baumann et al 1973;M. BouDagher-Fadel, pers.…”

Section: Rajamandala Ridgementioning

confidence: 99%

Thrusting of a volcanic arc: a new structural model for Java

Clements

Hall

Smyth

et al. 2009

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Java is part of a volcanic island arc situated in the Indonesian archipelago at the southern margin of the Eurasian Plate. Sundaland continental crust, accreted to Eurasia by the Early Mesozoic, now underlies the shallow seas to the north of Java where there has been considerable petroleum exploration. Java has an apparently simple structure in which the east-west physiographic zones identified by van Bemmelen broadly correspond to structural zones. In the north there is the margin of the Sunda Shelf and, in southern Java, there are Cenozoic volcanic arc rocks produced by spatially and temporally discrete episodes of subduction-related volcanism. Between the Sunda Shelf and the volcanic rocks are Cenozoic depocentres of different ages containing sedimentary and volcanic material derived from north and south. This simplicity is complicated by structures inherited from the oldest period of subduction identified beneath Java, in the Cretaceous, by extension related to development of the volcanic arcs, by extension related to development of the Makassar Straits, by late Cenozoic contraction, and by cross-arc extensional faults which are active today. Based on field observations in different parts of Java, we suggest that major thrusting in southern Java has been overlooked. The thrusting has displaced some of the Early Cenozoic volcanic arc rocks northwards by 50 km or more. We suggest Java can be separated into three distinct structural sectors that broadly correspond to the regions of West, Central and East Java. Central Java displays the deepest structural levels of a series of north-directed thrusts, and Cretaceous basement is exposed; the overthrust volcanic arc has been largely removed by erosion. In West and East Java the overthrust volcanic arc is still preserved. In West Java the arc is now thrust onto the shelf sequences that formed on the Sundaland continental margin. In East Java the volcanic arc is thrust onto a thick volcanic/sedimentary sequence formed north of the arc in a flexural basin due largely to volcanic arc loading. All the components required for a petroleum system are present. This hypothesis is yet to be tested by seismic studies and drilling, but, if correct, there may be unexplored petroleum systems in south Java that are worth investigating.

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Section: Rajamandala Ridgementioning

confidence: 99%

Thrusting of a volcanic arc: a new structural model for Java

Clements

Hall

Smyth

et al. 2009

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“…The belt of active calc-alkalic volcanoes is superimposed upon older volcanic and volcaniclastic rocks, which are intercalated with Oligocene and Neogene sediments and are intruded by small plutonic masses of similar composition (Baumann, de Genevraye, and others, 1973;Baumann, Oesterle, and others, 1973;de Genevraye and Samuel, 1973;Mulhadiyono, 1973;Rutten, 1926). The main magmatic belt lay in about its present position during most of Miocene and Pliocene time, but during the late Oligocene and early Miocene it lay closer to what is now the south coast.…”

Section: Late Cenozoic Volcanoesmentioning

confidence: 99%

Tectonics of the Indonesian region

Hamilton¹

1979

Professional Paper

1,267

586

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“…The thickness of the outcrop at this location is approximately 5.5 m. Oostingh [7] suggested this outcrop is included in the Sondian stage of upper Pliocene and is referred to as Tjimanceuri layers. Name of Cimanceuri Formation has been used in these rock units by Baumann, et al [3], and placed this formation into the Upper Miocene -Pliocene. Sudjatmiko and Santosa [12] separated the existing rock units into two formations, namely the Bojongmanik Formation and Cimanceuri Formation, where Bojongmanik Formation occupies the upper Miocene -Lower Pliocene, whilst Cimanceuri Formation of Middle Pliocene.…”

Section: Bayah (Byh) and Lithologymentioning

confidence: 99%

Granulometric Models of Zaria Bantamensis Beds at Bojong and Bayah Area, in Banten Province

Pandita

2019

Journal Technology of Civil, Electrical, Mechanical, Geology, M

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Several research on mollusk fossils have been done in Indonesia. So far research was focused in the identification of species. Although thestudy ofrelationshipsbetween mollusks fossilsand their environment is important, only a few studies have been carried out it in Indonesia. The present study is aimed to reveal the relationships of genus Zaria appearance and sedimentation mechanism and expected to provide an overview of environmental model of Zaria. The methods used are field surveys, laboratory analysis and identification of morphological character of Zaria. Field surveys were conducted in two sites of discovery of Zaria bantamensis fossil in Bayah and Bojong areas. Laboratory work composes of granulometricand statistical analysis of biometric Zaria.The results showed that Zaria bantamensis appeareancewas associated with the rocks of poor sorting characteristics, with medium to fine sand grain sizes. Based on Visher curve the sedimentation mechanism of Bojong samples was dominated by saltation and in Bayah samples was thesuspensions. The results also indicate a possible relationship between shell length and sedimentation mechanism conditions.

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Contribution to the Geological Knowledge of South West Java

Cited by 7 publications

References 2 publications

Thrusting of a volcanic arc: a new structural model for Java

Thrusting of a volcanic arc: a new structural model for Java

Tectonics of the Indonesian region

Granulometric Models of Zaria Bantamensis Beds at Bojong and Bayah Area, in Banten Province

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