Journal
GONDWANA RESEARCH
Volume 19, Issue 1, Pages 291-309Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.gr.2010.05.014
Keywords
Chemostratigraphy; Barremian-Danian; Cauvery Basin; India
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Funding
- Alexander von Humboldt Foundation, Germany
- Council of Scientific and Industrial Research, New Delhi, India
- Department of Science and Technology, New Delhi
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Chemostratigraphic concepts postulate that distinct chemozones could be recognized from rock records to help correlate geographically separated strata. Many studies have upheld this view, but were limited to classic boundaries such as Cenomanian-Turonian or Cretaceous-Tertiary. Only a few elements and isotopic compositions were made use in such studies. An attempt to recognize chemozones of Barremian-Danian strata of the Cauvery Basin, South India through whole-rock chemistry had revealed many complex signals and depositional events as expressed by bulk geochemical profiles. The signals indicate major shift in sedimentation pattern from dynamic depocenter to stable depositional conditions during Santonian. Varying sensitivities of different elements towards prevalent depositional conditions are also inferred. Trends of geochemical composition indicated domination of single depositional control all through the depositional history, basinal configuration that limited terrestrial sediment source and episodic influx of detrital materials. Presence of distinct change in whole-rock geochemistry across geochronological and lithostratigraphic boundaries is deciphered through a statistical tool ANOVA. These results demonstrate that visual delineation of chemozones in a long ranging rock record would be tenuous and has to be exercised with caution. (C) 2010 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved.
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