THE EVOLUTION OF RANGKASBITUNG BASIN IN THE MIDDLE TO LATE MIOCENE
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Date
2021-07-13
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Abstract
The Rangkasbitung Basin is part of the Banten basin which is bounded by Tinggian
Bayah in the South and Platfom Seribu in the North. The existence of the
Bojongmanik Formation as a typical deposit of the Rangkasbitung Basin still has
confusion in the nomenclature so that it needs to be studied in depth. The aim of
this research is to reveal the geological characteristics of the Rangkasbitung Basin,
to distinguish the characteristics of the lithostratigraphy and biostratigraphic of
the constituent rocks, also to describe the correlation and study of the sedimentation
succession of the Rangkasbitung Basin. The methods are mapping and measuring
surface geology and microfossil analysis. The results of the analysis of the
distribution of bentonic fossils found paleogeometric shapes showing two
geometrical forms of basins and two high geometric shapes in the Rangkasbitung
Basin, namely, the Jasinga Basin and the Leuwiliang Basin and the Cigudeg Height
and the Muncang Height. The paleogeometric form that occurs is thought to be a
control of the faulting block which results in the form of valley and high depression.
Based on different lithostratigraphic and biostratigraphic characteristics, the
Bojongmanik Formation is separated into two formations referred to as the
"Jasinga Formation" and the Bojongmanik Formation. The fossil content of the
"Jasinga Formation" has 6 genus 30 plankton species and 21 genus, 11 benthic
species. The Bojongmanik Formation has 9 genus, 33 plankton species with 19
genus and 6 benthic species. The presence of “Amphistegina” and “Rotalia
becarii” is a parameter for the depositional environment of the Jasinga Basin and
the presence of “Spaeroidinella and Spaerodinellopsis” which characterizes the
age of the Bojongmanik Formation. The evolution of the Rangkasbitung Basin
began in the Early Middle Miocene (N9-N12), filled with the Jasinga Basin by
sedimentation of the "Jasinga Formation", the Cigudeg Height is filled by
sedimentation of the Bojongmanik Formation which extends to the edges of the
Jasinga Basin. In the Late Middle Miocene (N13 - N14) a regression process
occurred, resulting in the southern part of the Jasinga Basin becoming land, and
the Bojongmanik Formation starting to fill the Leuwiliang Basin simultaneously by
sedimentation material of the Cibulakan Formation which was sourced from the
Continent Shelf Sedimentation Mandala that covered each other. In the Late
Miocene (N15-N17), the Jasinga Basin and the Leuwiliang Basin were lifted to
land, in the northern part the deposition of the Bojongmanik Formation still took
place in the periphery Neritic environment until the transition.
Keywords : Evolution, Rangkasbitung Basin, Middle to Late Miocen
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Keywords
EVOLUTION, RANGKASBITUNG BASIN, MIDDLE to LATE MIOCENE