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Electron spin resonance characterization of calcretes from Thar desert for dating applications

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Title Electron spin resonance characterization of calcretes from Thar desert for dating applications
 
Creator KAILATH, AJ
RAO, TKG
DHIR, RP
NAMBI, KSV
GOGTE, VD
SINGHVI, AK
 
Subject paramagnetic resonance
esr
calcite
 
Description Results of a study to characterize electron spin resonance (ESR) signals from naturally occurring carbonates from Thar desert are reported. Three radiation induced signals at g = 2.0071 (signal A, very weak), g = 2.0012 (signal B) and g = 2.0003 (signal C) with linewidths ranging from 0.5-2 G are seen. A broad signal (BL) with linewidth 7 G is also seen at 2,0038, Detailed ESR experiments involving (1) sensitivity of ESR signals to ionizing radiation, (2) intensity variation of ESR signals with microwave power at different temperatures, (3) analysis of acid insoluble residue to estimate the interference from ESR signals of silicate fraction, and (4) X-ray diffraction analysis (to study possible phase changes on heating), led to the choice of signal BL for dating. Experiments on acid insoluble residue revealed that signal C has a contribution from the E-1' centre of quartz and signal B is the parallel component (g(parallel to)) of the E-1' centre, Paleodose estimates based on signal BL are stratigraphically consistent. (. .
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2011-08-24T06:20:21Z
2011-12-26T12:56:46Z
2011-12-27T05:45:59Z
2011-08-24T06:20:21Z
2011-12-26T12:56:46Z
2011-12-27T05:45:59Z
2000
 
Type Article
 
Identifier RADIATION MEASUREMENTS, 32(4), 371-383
1350-4487
http://dx.doi.org/10.1016/S1350-4487(99)00282-6
http://dspace.library.iitb.ac.in/xmlui/handle/10054/10785
http://hdl.handle.net/10054/10785
 
Language en