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Title: GEOTHERMOBAROMETRIE Author: Alain ABREAL Last modified by: Alain ABREAL Created Date: 1/28/2005 7:04:04 PM Document presentation format: Affichage l' cran
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Geothermobarometry Partioning of Fe, Mg with Temperature: The Garnet-Biotite Geothermometer Fe, Mg have similar ionic radii, therefore volume change small The Garnet ...
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P-T-t Paths and Their Significance Metamorphic Field Gradient Trend of Thermal Maxima Across Metamorphic Facies Clockwise P-T-t Path P-T-t Path Reflecting Crustal ...
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Chapter 25. Metamorphic Facies and Metamorphosed Mafic Rocks V.M. Goldschmidt (1911, 1912a), contact metamorphosed pelitic, calcareous, and psammitic hornfelses in ...
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Thermodynamics Begin with a brief review of Chapter 5 Natural systems tend toward states of minimum energy Figure 27.13. P-T pseudosection calculated by THERMOCALC ...
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... petrogenetic grid for metamorphosed mafic rocks showing the location of several determined univariant reactions in the CaO-MgO-Al2O3-SiO2-H2O-(Na2O) system ...
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More Ca-rich plagioclases become progressively unstable as T lowered ... pressure-temperature-time paths based on a crustal thickening heat-flow model. ...
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Geothermobarometry How do we know P and T? Geothermobarometry Need min. at equilibrium Good barometer rxn vs. good thermometer rxn Which has large DV and which has ...
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GEOS 444 Lecture Topics 32805
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T-X phase diagram of the system albite-orthoclase at ... of several determined univariant reactions in the CaO-MgO-Al2O3-SiO2-H2O-(Na2O) system ( C(N)MASH ...
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Consider a plane of unit area oriented at an angle Q to the principal stress ... Plastic strength of rocks Continuum Mechanics: Brittle Failure Continuum ...
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0 deg C for surface; 1300 deg C for base of lithosphere (100 km before thickening) ... Delamination of thickened lithosphere * Result of convective mantle flow ...
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Yet they are not accurate, because they do not hit the bulls-eye. b. ... but they are accurate, because the average of the shots is near the bulls-eye. c. ...
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Thus, if we had a rock with clinopyroxene and olivine which we can assume were ... This calibration can be written in the alternative form: ...
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... between olivine and melt is strongly dependent on the MgO content of the olivine ... kh is a proportionality constant called the Henry's law constant ...
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