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The Coupling of Orbulina universa< Diameter with the Warming and Cooling Events in the Arabian Sea Over the Past 40,000 Years


Affiliations
1 Paleo-Environment Research Group, Department of Applied Geology, School of Earth and Atmospheric Sciences, University of Madras, Chennai 600 025, India
2 Institute for Ocean Management, Anna University, Chennai 600 025, India
3 Department of Geology, University of Madras, Chennai 600 025, India
4 Petroleum Engineering Department, Chandigarh University, Mohali 140 413, India
 

A 40 ky record of variations in the average diameter of Orbulina universa from a 5.4 m core (SK-322) in the Arabian Sea, off Goa, India has been analysed in this study. The chronology of the upper 1.00 m of the core was documented by AMS radiocarbon dates. Fifty specimens of O. universa were hand-picked from each of the 50 subsamples. In all, 2500 specimens were measured for their diameter. Downcore variations in the average diameter of O. universa were in excellent agreement with the curve representing the Iberian Margin temperature index, with the peak representing the Bølling–Allerød transition and the troughs reflecting Heinrich Event I and Younger Dryas. The lower part of the core examined in this study (between 58 and 100 cm), which is the equivalent of 30,000–40,000 years BP, is marked by closely spaced peaks and troughs that are interpreted as representing the Dansgaard– Oeschger cycles that were dominant in the Northern Hemisphere between 60,000 and 30,000 years BP.

Keywords

Average Diameter, Orbulina universa, Palaeoclimate, Planktic Foraminifera.
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  • The Coupling of Orbulina universa< Diameter with the Warming and Cooling Events in the Arabian Sea Over the Past 40,000 Years

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Authors

P. M. Nimmy
Paleo-Environment Research Group, Department of Applied Geology, School of Earth and Atmospheric Sciences, University of Madras, Chennai 600 025, India
N. Rajeshwara Rao
Paleo-Environment Research Group, Department of Applied Geology, School of Earth and Atmospheric Sciences, University of Madras, Chennai 600 025, India
K. Neelavannan
Institute for Ocean Management, Anna University, Chennai 600 025, India
S. M. Hussain
Department of Geology, University of Madras, Chennai 600 025, India
S. R. Mahapatra
Petroleum Engineering Department, Chandigarh University, Mohali 140 413, India

Abstract


A 40 ky record of variations in the average diameter of Orbulina universa from a 5.4 m core (SK-322) in the Arabian Sea, off Goa, India has been analysed in this study. The chronology of the upper 1.00 m of the core was documented by AMS radiocarbon dates. Fifty specimens of O. universa were hand-picked from each of the 50 subsamples. In all, 2500 specimens were measured for their diameter. Downcore variations in the average diameter of O. universa were in excellent agreement with the curve representing the Iberian Margin temperature index, with the peak representing the Bølling–Allerød transition and the troughs reflecting Heinrich Event I and Younger Dryas. The lower part of the core examined in this study (between 58 and 100 cm), which is the equivalent of 30,000–40,000 years BP, is marked by closely spaced peaks and troughs that are interpreted as representing the Dansgaard– Oeschger cycles that were dominant in the Northern Hemisphere between 60,000 and 30,000 years BP.

Keywords


Average Diameter, Orbulina universa, Palaeoclimate, Planktic Foraminifera.

References





DOI: https://doi.org/10.18520/cs%2Fv120%2Fi4%2F694-698