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Cited by 264

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A Simple Thermodynamic Model for Melting of Peridotite in the System NCFMASOCr

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Jennings, Eleanor S., Holland, Tim J. B.·2015·Journal of Petrology

Abstract

A new thermodynamic model is presented for calculating phase relations in peridotite, from 0Á001 to 60 kbar and from 800 C to liquidus temperatures, in the system NCFMASOCr.This model system is large enough to simulate phase relations and melting of natural peridotite and basaltic liquids.Calculations in the program THERMOCALC illustrate mantle phase relationships and melting conditions, specifically for the peridotite composition KLB-1.The garnet-spinel transition zone intersects the solidus at 21Á4-21Á7 kbar, where both Fe 3þ and Cr increase spinel stability, expanding the width of the transition.Orthopyroxene is lost at the solidus at 42 kbar in KLB-1, although this pressure is very sensitive to bulk composition.Calculated oxidation states are in excellent agreement with measured log f O 2 for xenolith suites with mantle Fe 2 O 3 contents in the range 0Á1-0Á3 wt %.It appears that mantle oxidation state is not just a simple function of P and T, but depends on phase assemblage, and may vary in a complex way within a single assemblage.The liquid model performs well, such that calculated solidus, melt productivity and liquid compositions compare favourably with those of experimental studies, permitting its use in interpolating between, and extrapolating from, experimental P-T conditions.Experimentally challenging but geologically useful regimes can be explored, such as subsolidus samples and very low melt fractions, with application to both mantle xenoliths and the origin of basalt.

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Metadata

Authors
Jennings, E. S., & Holland, T. J. B.
Venue
Journal of Petrology
Published
2015-05
Volume
56
Issue
5
Pages
869-892
ISSN
  • 0022-3530 (ISSN-L)
  • 1460-2415
OpenAlex
W2301704396
Cited by
264
References
77
FWCI
13.53
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: A Simple Thermodynamic Model for Melting of Peridotite in the System NCFMASOCr. https://app.cochat.ai/papers/10.1093/petrology/egv020
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Jennings, E. S., & Holland, T. J. B. (2015). A Simple Thermodynamic Model for Melting of Peridotite in the System NCFMASOCr. Journal of Petrology. https://doi.org/10.1093/petrology/egv020

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