Rare earth elements distribution in clay zones of sedimentary formation, Pondicherry, south India

Concentrations of five rare earth elements (REE) were measured in clay samples of a deep bore hole comprising major aquifers of Pondicherry region, south India in order to investigate the geochemical variations among various litho-units. Clay samples from Cretaceous formation show distinct gray to b...

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Bibliographic Details
Published in:Journal of radioanalytical and nuclear chemistry 2012-11, Vol.294 (2), p.303-308
Main Authors: Tirumalesh, K., Ramakumar, K. L., Chidambaram, S., Pethaperumal, S., Gursharan Singh
Format: Article
Language:English
Subjects:
Aquifers
Chemistry
Chemistry and Materials Science
Diagnostic Radiology
Hadrons
Heavy Ions
Inorganic Chemistry
Meteorites
Nuclear Chemistry
Nuclear Physics
Physical Chemistry
Rocks, Sedimentary
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Summary:Concentrations of five rare earth elements (REE) were measured in clay samples of a deep bore hole comprising major aquifers of Pondicherry region, south India in order to investigate the geochemical variations among various litho-units. Clay samples from Cretaceous formation show distinct gray to black color whereas Tertiary deposits have clays with color varying from pale yellow to brown to gray. All measured REEs exhibit lower concentrations than Upper Continental Crust (UCC) average values. Large variations in REEs contents were observed in different sedimentary formations (Tertiary and Cretaceous). Chondrite normalized ratio of La/Lu and Eu/Eu* indicate that the clays are derived from weathering of felsic rock and possibly under humid climate. All the samples showed positive Eu anomaly in North American Shale Composite (NASC) normalized plot which shows plagioclase feldspar as the major contributor to these clays. Positive Eu anomaly is also an indication of reduced condition of the formation.
ISSN:0236-5731
1588-2780
DOI:10.1007/s10967-011-1606-9