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Quantitative 3D measurement of ilmenite abundance in Alpe Arami olivine by confocal microscopy: Confirmation of high-pressure origin

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Published/Copyright: March 31, 2015
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American Mineralogist
From the journal American Mineralogist Volume 88 Issue 4

Abstract

A critical aspect of the debate about the origin and conditions of metamorphism of the Alpe Arami (AA) peridotite is the disagreement over how much ilmenite is contained in the older generation of olivine and therefore how much TiO2 might have been dissolved at high pressure and temperature. We have now determined quantitatively the 3-dimensional distribution of ilmenite in AA olivine by confocal laser scanning microscopy (CLSM). The CLSM measurements show an average concentration of 0.31 vol% of ilmenite in olivine, with individual grains containing up to 1.2 vol%. This translates into average and maximum concentrations of 0.23 and 0.9 wt% TiO2 in olivine, respectively, and confirms the original estimation of maximum concentration of ~1 vol% TiO2. The vast majority of ilmenite in AA olivine is distributed randomly (although topotactically oriented) and, in all cases, is accompanied by chromite in a ratio of ~4:1. These observations are consistent with an origin of the ilmenite (and chromite) by exsolution from an olivine solid solution at P = 9- 12 GPa and temperatures above the stability field of titanian clinohumite, but are not consistent with suggested breakdown of titanian clinohumite. Combining these results with other recent findings suggests that exsolution followed deformation under relatively high fugacity of H2O, and that the high solubility of TiO2 is probably explained by pressure-induced accommodation of Ti in the tetrahedral site of silicates.

Received: 2002-4-2
Accepted: 2002-12-2
Published Online: 2015-3-31
Published in Print: 2003-4-1

© 2015 by Walter de Gruyter Berlin/Boston

Articles in the same Issue

  1. Electronic structure of Fe-bearing lazulites
  2. An FTIR study of tetrahedrally coordinated ferrous iron in the spinel-hercynite solid solution
  3. O atom sites in natural kaolinite and muscovite: 17O MAS and 3QMAS NMR study
  4. The basic copper arsenate minerals olivenite, cornubite, cornwallite, and clinoclase: An infrared emission and Raman spectroscopic study
  5. Occurrence of Zn/Al hydrotalcite in smelter-impacted soils from northern France: Evidence from EXAFS spectroscopy and chemical extractions
  6. Stepwise dehydration of Sr-exchanged heulandite: A single-crystal X-ray study
  7. Spontaneous strain variations through the low temperature phase transitions of deuterated lawsonite
  8. Elastic strain enthalpies of exsolution: HF solution calorimetric experiments on alkali aluminosilicate and aluminogermanate feldspars
  9. Topology of the pyroxenes as a function of temperature, pressure, and composition as determined from the procrystal electron density
  10. The effect of pressure upon hydrogen bonding in chlorite: A Raman spectroscopic study of clinochlore to 26.5 GPa
  11. The effect of transformation twins on the seismic-frequency mechanical properties of polycrystalline Ca1–xSrxTiO3 perovskite
  12. Hydrogen deficiency in Ti-rich biotite from anatectic metapelites (El Joyazo, SE Spain): Crystal-chemical aspects and implications for high-temperature petrogenesis
  13. Quantitative 3D measurement of ilmenite abundance in Alpe Arami olivine by confocal microscopy: Confirmation of high-pressure origin
  14. Chromian dissakisite-(Ce) in a garnet lherzolite from the Chinese Su-Lu UHP metamorphic terrane: Implications for Cr incorporation in epidote-group minerals and recycling of REE into the Earth’s mantle
  15. Mass transfer and reaction paths in alteration zones around carbonate veins in the Nishisonogi Metamorphic Rocks, southwest Japan
  16. Low–pressure subsolidus and suprasolidus phase equilibria in the MnNCKFMASH system: Constraints on conditions of regional metamorphism in western Maine, northern Appalachians
  17. Trace-element partitioning between apatite and carbonatite melt
  18. Biomimetic control of crystal assembly by growth in an organic hydrogel network
  19. Model pyroxenes I: Ideal pyroxene topologies
  20. Crystal chemistry of the 1M mica polytype: The octahedral sheet
  21. Contribution to the mineralogy of acid drainage of Uranium minerals: Marecottite and the zippeite-group
  22. Cejkaite, the triclinic polymorph of Na4(UO2)(CO3)3—a new mineral from Jáchymov, Czech Republic
  23. Continuous Cauchy wavelet transform analyses of EXAFS spectra: A qualitative approach
  24. A filler-rod technique for controlling redox conditions in cold-seal pressure vessels
https://doi.org/10.2138/am-2003-0413

Articles in the same Issue

  1. Electronic structure of Fe-bearing lazulites
  2. An FTIR study of tetrahedrally coordinated ferrous iron in the spinel-hercynite solid solution
  3. O atom sites in natural kaolinite and muscovite: 17O MAS and 3QMAS NMR study
  4. The basic copper arsenate minerals olivenite, cornubite, cornwallite, and clinoclase: An infrared emission and Raman spectroscopic study
  5. Occurrence of Zn/Al hydrotalcite in smelter-impacted soils from northern France: Evidence from EXAFS spectroscopy and chemical extractions
  6. Stepwise dehydration of Sr-exchanged heulandite: A single-crystal X-ray study
  7. Spontaneous strain variations through the low temperature phase transitions of deuterated lawsonite
  8. Elastic strain enthalpies of exsolution: HF solution calorimetric experiments on alkali aluminosilicate and aluminogermanate feldspars
  9. Topology of the pyroxenes as a function of temperature, pressure, and composition as determined from the procrystal electron density
  10. The effect of pressure upon hydrogen bonding in chlorite: A Raman spectroscopic study of clinochlore to 26.5 GPa
  11. The effect of transformation twins on the seismic-frequency mechanical properties of polycrystalline Ca1–xSrxTiO3 perovskite
  12. Hydrogen deficiency in Ti-rich biotite from anatectic metapelites (El Joyazo, SE Spain): Crystal-chemical aspects and implications for high-temperature petrogenesis
  13. Quantitative 3D measurement of ilmenite abundance in Alpe Arami olivine by confocal microscopy: Confirmation of high-pressure origin
  14. Chromian dissakisite-(Ce) in a garnet lherzolite from the Chinese Su-Lu UHP metamorphic terrane: Implications for Cr incorporation in epidote-group minerals and recycling of REE into the Earth’s mantle
  15. Mass transfer and reaction paths in alteration zones around carbonate veins in the Nishisonogi Metamorphic Rocks, southwest Japan
  16. Low–pressure subsolidus and suprasolidus phase equilibria in the MnNCKFMASH system: Constraints on conditions of regional metamorphism in western Maine, northern Appalachians
  17. Trace-element partitioning between apatite and carbonatite melt
  18. Biomimetic control of crystal assembly by growth in an organic hydrogel network
  19. Model pyroxenes I: Ideal pyroxene topologies
  20. Crystal chemistry of the 1M mica polytype: The octahedral sheet
  21. Contribution to the mineralogy of acid drainage of Uranium minerals: Marecottite and the zippeite-group
  22. Cejkaite, the triclinic polymorph of Na4(UO2)(CO3)3—a new mineral from Jáchymov, Czech Republic
  23. Continuous Cauchy wavelet transform analyses of EXAFS spectra: A qualitative approach
  24. A filler-rod technique for controlling redox conditions in cold-seal pressure vessels
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