Submitted on: 24 February 2003.
Revised on: 02 June 2003.
Accepted on: 26 June 2003.
___________________Acta Geochimica---SPRINGER INT PUBL AG
Submitted on: 04 April 2013.
Revised on: 02 May 2013.
Accepted on: 15 May 2013.
___________________Acta Geochimica---SPRINGER INT PUBL AG
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Submitted on: 19 June 2011.
Revised on: 19 July 2011.
Accepted on: 05 August 2011.
___________________Acta Geochimica---SPRINGER INT PUBL AG
Submitted on: 15 August 2009.
Revised on: 01 October 2009.
Accepted on: 23 October 2009.
___________________Acta Geochimica---SPRINGER INT PUBL AG
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