Journal ArticleDOI
Geothermometry and Oxygen Barometry Using Coexisting Iron-Titanium Oxides: A Reappraisal
TLDR
In this article, an independent iron-titanium oxide geothermometer and oxygen barometer from the experimental data of Buddington and Lindsley (1964) are presented graphically for coexisting ilmenite solid solutions and magnetite solid solution in the system FeO-Fe2O3-TiO2.Abstract:
Equilibrium thermodynamic methods are used to develop an independent iron-titanium oxide geothermometer and oxygen barometer from the experimental data of Buddington and Lindsley (1964). The geothermometer and oxygen barometer are presented graphically for coexisting ilmenite solid solution and magnetite solid solution in the system FeO-Fe2O3-TiO2. Equations are also given for calculating temperature and oxygen activity for natural coexisting iron-titanium oxides containing other components. Large departures in composition from the system FeO-Fe2O3-TiO3 result in large uncertainties in the calculated temperature and activity of oxygen.read more
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A solution model for coexisting iron–titanium oxides
TL;DR: A solution model for coexisting magnetite-ulvcispinel and hematite-ilmenite solid solutions was developed by Spencer and Lindsley as mentioned in this paper and applied to the Buddington-Lindsley (1964) geothermometer and oxygen barometer.
Journal ArticleDOI
The chemistry of hydrothermal magnetite: A review
TL;DR: The most important factors that govern compositional variations in hydrothermal magnetite are (A) temperature, (B) fluid composition, (C) oxygen and sulfur fugacity, (D) silicate and sulfide activity, (E) host rock buffering, (F) reequilibration processes, and (G) intrinsic crystallographic controls such as ionic radius and charge balance as mentioned in this paper.
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Fe-Ti oxide geothermometry: thermodynamic formulation and the estimation of intensive variables in silicic magmas
Mark S. Ghiorso,O. Sack +1 more
TL;DR: In this article, a new thermodynamic formulation of the Fe−Ti oxide geothermometer/oxygen barometer is developed, which is internally consistent with thermodynamic models for (Fe2+,Mg)-olivine and -orthopyroxene solid solutions and end-member thermodynamic properties.
Journal ArticleDOI
ILMAT: an excel worksheet for ilmenite--magnetite geothermometry and geobarometry
Journal ArticleDOI
Investigations of an intrusive contact, northwest Nelson, New Zealand—I. Thermal, chronological and isotopic constraints
T. Mark Harrison,Ian McDougall +1 more
TL;DR: In the Nelson area of New Zealand, intrusion of the Separation Point Batholith 114 Ma ago caused thermal metamorphism in the adjacent Devonian Rameka Gabbro that allowed radiogenic 40Ar to diffuse partially out of hornblendes in the gabbro as mentioned in this paper.