Miocene warm tropical climate: Evidence based on oxygen isotope in central java, Indonesia

Akmaluddin, Koichiro Watanabe, Akihiro Kano, Wartono Rahardjo

Research output: Contribution to journalArticlepeer-review

Abstract

Oxygen and carbon isotopes records of multi-species planktonic, benthic foraminifera and bulk carbonate sample from Central Java Indonesia demonstrate that warm sea surface temperature occurred during the Miocene. Planktonic δ 18O values from this study consistently lighter (-4 to -3 ‰PDB) than previous studies that indicate sea surface temperature during Miocene in this area was warm than tropical/equatorial localities. A surprising decrease of oxygen isotopic composition was recorded at ±14 Ma where the maximum of δ 18O values is -4.87 ‰PDB for Orbulina universa, -5.02 ‰PDB for Globigerinoides sacculifer and -4.30 ‰PDB for Globoquadrina dehiscens, this event we predict as Middle Miocene Optimum. Warming of sea surface temperature we interpret as related to the development of Western Pacific Warm Pool where warm water from Pacific Ocean through the Indonesian seaway appears to remain during Miocene. Our result also show increasing suddenly of oxygen isotope values of planktic, benthic and bulk carbonate sample from ± 12 Ma, the increasing cooled surface water relatively high degree with Late Miocene global cooling climate or we predict that due to closing of Indonesian Gateway.

Original languageEnglish
Pages (from-to)66-70
Number of pages5
JournalWorld Academy of Science, Engineering and Technology
Volume71
Publication statusPublished - Nov 1 2010

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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