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The Significance of Multiple Saturation Points in the Context of Polybaric Near-fractional
 

Summary: The Significance of Multiple Saturation Points
in the Context of Polybaric Near-fractional
Melting
PAUL D. ASIMOW1
* AND JOHN LONGHI2
1
DIVISION OF GEOLOGICAL AND PLANETARY SCIENCES 170-25, CALIFORNIA INSTITUTE OF TECHNOLOGY,
PASADENA, CA 91125, USA
2
LAMONT­DOHERTY EARTH OBSERVATORY, PALISADES, NY 10964, USA
RECEIVED JULY 2, 2003; ACCEPTED APRIL 6, 2004
Experimental petrologists have successfully located basaltic liquid
compositions parental to mid-ocean ridge basalt that are, within
experimental resolution, multiply saturated with three-phase harz-
burgite or four-phase lherzolite assemblages on their liquidus at some
elevated pressure. Such an experimental result is a necessary conse-
quence of any paradigm in which erupted basalts derive from single-
batch primary liquids that equilibrate with a mantle residue and
undergo no subsequent magma mixing before differentiation and
eruption. Here we investigate whether, conversely, such evidence of

  

Source: Asimow, Paul D. - Division of Geological and Planetary Sciences, California Institute of Technology,

 

Collections: Geosciences