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A magnetic and geochemical characterization of red dune sands (teri sands) of Tamil Nadu coast

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Title A magnetic and geochemical characterization of red dune sands (teri sands) of Tamil Nadu coast
 
Creator Anburaj, Vidyasakar
Sant’Ovaia, Helena
Gomes, Celeste
Lourenço, Ana
Seshachalam, Srinivasalu
 
Subject Magnetic parameters
Geochemistry
Teri sands
Hematite
Magnetite
India
 
Description 1382-1392
Teri sands from the southeast coast of Tamil Nadu were examined by magnetic methods, including magnetic susceptibility measurements, acquisition of isothermal remanent magnetization, and geochemistry. Four sections were excavated up to 5-7m with three inland deposits (KCV, SKM and TPV) and one near coastal (THOP). Magnetic parameters show the important contribution of hematite structures to the studied sands, namely in SKM and KCV samples. In TPV and THOP samples, magnetic parameters indicate the presence of multidomain magnetite or mixed mineral contents of magnetite and antiferromagnetic minerals. SKM samples present the highest quantity of hematite and smallest quantity of magnetite, as is shown by the highest values of HIRM% and smallest of S-300 and SIRM. The positive correlation between  with clay in TPV, THOP and KCV sections indicates that the clay matrix carries magnetic susceptibility. In SKM, magnetic susceptibility is due to the silt fraction. Presence of magnetite in THOP and TPV sections is probably of oceanic origin carried by strong offshore winds. In SKM the wet environments due to cultivation (associated with a arid climate) may contribute to the prevalence of the necessary conditions for the dominant presence of hematite.
 
Date 2016-07-21T08:38:12Z
2016-07-21T08:38:12Z
2015-09
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://nopr.niscair.res.in/jspui/handle/123456789/34926
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.44(09) [September 2015]