International Journal on Advanced Science, Engineering and Information Technology, Vol. 9 (2019) No. 2, List of accepted papers, DOI:10.18517/ijaseit.9.2.7573

The Mid Miocene Climatic Optimum (MMCO) Indication at Low Latitude Sediment Case Study: The Miocene Cibulakan Formation, Bogor Basin, Indonesia

Rubiyanto Kapid, Wahyu Dwijo Santoso, Ben Ikhsan, Moehammad Ali Jambak, Dasapta Erwin Irawan

Abstract

Middle Miocene Climatic Optimum (MMCO) is widely distributed and associated with increasing temperature and CO2content in the atmosphere. The effect of MMCO is widely identified in the mid-latitude region, with lack of examples from the low latitude areas. In this study, we aim to determine the effect of MMCO at Cibulakan Formation of Bogor Basin, Indonesia, which is situated in lower latitude. We took 58 samples from the Cibulakan Formation, which is exposed along Cileungsi River, for quantitative nannoplankton (the abundance of Helicosphaera carteri) analysis to mark increasing and decreasing salinity event, as they are sensitive to temperature. Temperature relates with salinity of the sea water due to evaporation. From our analysis, we identified sea surface temperature change in Early Miocene which was presumably due to small scale Early Miocene glaciation and active tectonic during the period. Warmer temperature took place on Middle Miocene as the effect of warm and open sea environment during Mid Miocene Climatic Optimum. Afterwards, temperature continued to rise until late Miocene, as it had been triggered by global increasing temperature at Pacific Ocean and widely distributed clean water at North West Java Basin during the depositional period.

Keywords:

Mid Miocene Climatic Optimum (MMCO), nannoplankton, temperature changes, Cibulakan Formation, Bogor basin

Viewed: 9 times (since Sept 4, 2017)

cite this paper