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TitleParameterization of the Fe=Mg exchange coefficient (Kd) between clinopyroxene and silicate melts
AuthorBédard, J H
SourceChemical Geology vol. 274, no. 3-4, 2010 p. 169-176,
Alt SeriesEarth Sciences Sector, Contribution Series 20100040
PublisherElsevier BV
Mediapaper; on-line; digital
File formatpdf
Subjectsigneous and metamorphic petrology; mineralogy; clinopyroxene; iron; magnesium; equilibrium; pressure-temperature conditions; mineral associations; mineralogical analyses; silica
Illustrationsplots; tables; photomicrographs; graphs
ProgramGEM: Geo-mapping for Energy and Minerals, PGE/Base Metals - Victoria Island (NWT and Nunavut)
AbstractCompilations of experimental data allow the clinopyroxene Fe=Mg exchange equilibrium constant (Kd = (XFe /XMg)Clinopyroxene/(XFe /XMg)Melt) to be parameterized. Values of Kd increase with increasing pressure, temperature, Log fO2, melt CaO, NBO/TO, LnMgO, MgO# ; and with decreasing melt SiO2, and Na2O+K2O. Multiple regression analysis yields improved fits, including some based solely on mineral compositional data. These parameterizations allow improved petrogenetic hypothesis testing for clinopyroxene-bearing assemblages.

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