Submitted on: 29 November 2010.
Revised on: 05 March 2011.
Accepted on: 11 April 2011.
___________________JOURNAL OF PETROLOGY---OXFORD UNIV PRESS
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Submitted on: 05 June 2002.
Revised on: 23 July 2002.
Accepted on: 27 August 2002.
___________________JOURNAL OF PETROLOGY---OXFORD UNIV PRESS
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Submitted on: 05 August 2004.
Revised on: 07 November 2004.
Accepted on: 23 November 2004.
___________________JOURNAL OF PETROLOGY---OXFORD UNIV PRESS
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