KONDISI PAELOSALINITAS PADA MIOSEN AKHIR–PLEISTOSEN DI CEKUNGAN JAWA TIMUR UTARA, INDONESIA, BERDASARKAN PERUBAHAN POPULASI NANOPLANKTON

Wahyu Dwijo Santoso; Halmi Insani; Rubiyanto Kapid

doi:10.14203/risetgeotam2014.v24.77

KONDISI PAELOSALINITAS PADA MIOSEN AKHIR–PLEISTOSEN DI CEKUNGAN JAWA TIMUR UTARA, INDONESIA, BERDASARKAN PERUBAHAN POPULASI NANOPLANKTON

Wahyu Dwijo Santoso, Halmi Insani, Rubiyanto Kapid

Abstract

Abstract Quantitative biostratigraphy analysis by observing Sphenolithus abies and Helicosphaera carteri could predict paleosalinity changes at a sedimentary basin diachronically. Hyposaline conditions can be investigated from the abundance changes of Helicosphaera carteri and Calcidiscus leptoporus counts. Along this line, the increasing number of Sphenolithus abies demonstrates particular states of normal saline. Paleosalinity changes in the North East Java Basin, from Late Miocene to Pleistocene were identified from the top of Wonocolo Formation to bottom of Ledok Formation. Paleosalinity along this episode was interpreted as hyposaline condition. While at the top of Ledok Formation to Mundu Formation; paleosalinity had changed to normal saline. Furthermore, environmental conditions return to hyposaline when Selorejo Formation sediment was deposited. And during the deposition of Lidah Formation, deposition environment had returned to the normal saline.

Keywords

paleosalinity, quantitative biostratigraphy, Helicosphaera carteri, Sphenolithus abies

Full Text:

PDF

References

Bour, I., Mattioli, E., Pittet., B., 2007. Nannofacies analysis as a tool to resconstruct palaeoenvironmental changes during the Early Toarcian anoxic event. Palaeogeography, Palaeoclimatology, Palaeoecology 249, 58–79.

De Genevraye, P., D., Samuel, L., 1972. Geology of the Kendeng zone (Central and East Java). Proceeding of Indonesian Petroleum Association First Annual Convention.

Insani, H. 2011. Geologi dan Analisis Biostratigrafi Nannoplankton Darah Gunungpanti dan Sekitarnya, Kabupaten Pati, Jawa Tengah. Bachelor Thesis, Institut Teknologi Bandung, Unpublished.

Melinte, C.M., 2004. Calcareous Nannoplankton, A Tool to Assign Enviromental Changes, Geo Eco Marina, Bucharest.

Kadar, D., and Sudijono, 1993. Geological map of Rembang sheet with scale 1:100.000. Bandung Geological Research and Development Center , Bandung.

Pringgoprawiro, H., 1983. Biostratigrafi dan Paleogeografi Cekungan Jawa Timur Utara Suatu Pendekatan Baru. PhD Dissertation, Geology Department, Institut Teknologi Bandung.

Sribudiyani, I., Muchsin, N., Sapiie, B., Ryacudu, R., Asikin, S., Kunto, T., Harsolumakso, A., Astono, P., Yulianto, I., 2003. The Collision of East Java Microplate and Its Implication for Hydrocarbon Occurence in The East Java Basin, Proceeding Indonesian Petroleum Association 30th Annual Conventin & Exhibition. Soft file: IPA03-G-085.

Van Bemmelen, R.W., 1949. The Geology of Indonesia, Netherland: Martinus Nyhoff, The Haque.

Wade, S.B. and Brown, R.P., 2006. Calcareous Nannofossils in Extreme Environments: The Messinian Salinity Crisis, Polemi Basin, Cyprus. Jurnal of Palaeogeography, Palaeoclimatology. Palaeoecology 233, 271– 286.

Young, J.R., Bown, P.R., Lees, J., 2011. Nannotax Enabling Nannofossil Research, International Nannoplankton Association. Http://www.nannotax.org, accessed 2 December 2013.

DOI: http://dx.doi.org/10.14203/risetgeotam2014.v24.77