Eocene submarine fan sedimentation in Southwest Java

Schiller, David; Garrard, R. A.; Prasetyo, Ludi

doi:10.29118/ipa.1403.125.181

Cited by 16 publications

(31 citation statements)

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“…Little is known about the ages of these rocks. Schiller et al (1991) reported that radiometric dating using the K-Ar method yielded very few conclusive results due to alteration. A pebble of basalt from a conglomerate of the Ciletuh Formation yielded a Late Cretaceous age, whereas plagioclase and whole-rock ages from a gabbro gave Paleocene to Middle Eocene ages.…”

Section: Ciletuh-bayahmentioning

confidence: 97%

“…The 'Pre-Tertiary' of Ciletuh Bay was reported by van Bemmelen (1949) to consist of 'metamorphic basic and ultra-basic rocks (gabbro, peridotite, serpentine) with chloritic schists and phyllites'. Schiller et al (1991) described an ophiolitic assemblage of peridotites, gabbros, pillow lava basalts and serpentinites associated with greenschists, mica-schists, amphibolite schists and quartzites, which has often been interpreted as a tectonic melange (e.g. Endang Thayyib 1977;Martodjojo et al 1978;Parkinson et al 1998).…”

Section: Ciletuh-bayahmentioning

confidence: 97%

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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: Ciletuh-bayahmentioning

confidence: 97%

Section: Ciletuh-bayahmentioning

confidence: 97%

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

Clements

Hall

Smyth

et al. 2009

View full text Add to dashboard Cite

show abstract

“…K-Ar dating provided few results due to alteration (Schiller et al 1991). A basalt pebble yielded a Late Cretaceous age, and a gabbro gave Paleocene to Middle Eocene ages.…”

Section: Volcanic Activitymentioning

confidence: 97%

“…These rocks are probably overlain, although subsequently juxtaposed tectonically (Clements & Hall 2007), by the Middle Eocene Ciletuh Formation, which includes angular volcaniclastic material, ophiolitic and chert debris, rare amphibolites, blocks of nummulitic limestones, and some volcaniclastic sandstones, incorporated when incompletely lithified. They are interpreted as deposits of a deep-marine forearc setting (Schiller et al 1991;Clements & Hall 2007). In East Java there are a few, very small, exposures of basement greenschists and marbles (Smyth et al 2007).…”

Section: Volcanic Activitymentioning

confidence: 99%