Oxygen isotopic composition of Albian-Turonian foraminifera from Cauvery Basin, India: Evidence of warm sea-surface temperature

The clays of Karai Formation (Uttatur Group) contain well-preserved planktonic and benthic foraminifera of Albian-Turonian age. The pristine tests of planktonic and benthic foraminifera were analyzed for their oxygen isotopic compositions. The delta O-18 values of planktonic foraminifera, comprising...

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Bibliographic Details
Main Authors: DAS GUPTA, K, SARASWATI, PK, KRAMAR, U, RAVINDRAN, CN, STUBEN, D, BERNER, Z
Format: Article in Journal/Newspaper
Language:English
Published: GEOLOGICAL SOC INDIA 2007
Subjects:
Southeastern India
Ocean
Tertiary
Eocene
Record
Palaeotemperature
Stable Isotopes
Foraminifera
Cretaceous
Cauvery Basin
Tamil Nadu
Planktonic foraminifera
Online Access:http://dspace.library.iitb.ac.in/xmlui/handle/10054/7866
http://hdl.handle.net/10054/7866
Description
Summary:The clays of Karai Formation (Uttatur Group) contain well-preserved planktonic and benthic foraminifera of Albian-Turonian age. The pristine tests of planktonic and benthic foraminifera were analyzed for their oxygen isotopic compositions. The delta O-18 values of planktonic foraminifera, comprising Whiteinella archaeocretacea, Marginotruncana sp., Rotalipora reicheli, Praeglobotruncana stephani and Globigerinelloides sp. indicate the maximum near-surface temperatures of 29 degrees C. The bottom water temperature, estimated on benthic foraminiferal species Gyroidinoides sp., Quadrimorphina sp., Gavelinella sp., Lenticulina sp. and Pleurostomella sp., is about 21 degrees C. This is in agreement with the palaeoclimatic conditions inferred on fossil assemblages.

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