Miocene Warm Tropical Climate: Evidence Based On Oxygen Isotope In Central Java, Indonesia

• Main Authors: Akmaluddin, Watanabe, Koichiro, Kano, Akihiro, Wartono Rahardjo
• Format: Text
• Language: English
• Published: Zenodo 2010
• Subjects: Oxygen isotope; Foraminifera; Miocene; Paleoclimate; Indonesian.; Davidson; Fang; Harcourt; Hayes; Hudson; Indian; Metcalfe; New Zealand; Pacific; Shackleton; Sinha; Smyth; Ice Sheet
• Online Access: https://dx.doi.org/10.5281/zenodo.1063224; https://zenodo.org/record/1063224

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 δ18O 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 δ18O 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. 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