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Origin of clinopyroxene-ilmenite symplectites in mafic granulites from eastern parts of the Chotanagpur granite gneissic complex, East Indian shield

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Published/Copyright: November 30, 2023
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American Mineralogist
From the journal American Mineralogist Volume 108 Issue 12

Abstract

In this manuscript, we report a rare occurrence of rod-like intergrowths of clinopyroxene-ilmenite that variably replace titanite in a suite of high-pressure mafic granulites from the Chotanagpur Granite Gneissic Complex, Eastern Indian Shield. Garnet proximal to the clinopyroxene-ilmenite intergrowth is invariably replaced with symplectic clinopyroxene-plagioclase or a rind of plagioclase. Textural modeling of the reaction textures and mineral compositions suggests that the garnet-titanite became unstable and the ilmenite-clinopyroxene preferentially develop after titanite. The presence and texture of halogen rich apatites within the ilmenite-clinopyroxene symplectite are consistent with a fluid mediated process. Thermodynamic modeling in the NCFMAST (+H2O) system, demonstrates that the clinopyroxene-ilmenite symplectite was formed along a steeply decompressive retrograde P-T path (from ~13 to ~7 kbar, at ~800 °C), in the presence of partial melts. The study demonstrates that relative to Fe, Mg, and Ca, Ti was less mobile and that the mobility of Ti was restricted within the confines of titanite being replaced by the clinopyroxene-ilmenite symplectite. This study implies that besides the ligand activity, the fluid/rock ratio exerts a strong control on the length scale of Ti transport in natural rocks.

Keywords: Clinopyroxene-ilmenite symplectite; high-pressure metamorphisim; CGGC; textural modeling; CSpace; XmapTools; Ti mobility

Funding statement: S.C. acknowledges the financial support from the Council of Scientific and Industrial Research (CSIR fellowship scheme at Department of Geology, Jadavpur University, Kolkata). S.M. acknowledges the grant received from Department of Science and Technology under DST-INSPIRE Faculty scheme at Department of Geology, University of Delhi. P.S. and S.S. are thankful to DST-PURSE, DST-FIST, and CAS-Phase-VI, obtained by Department of Geological Sciences, Jadavpur University. P.S. acknowledges the AvH Foundation for a fellowship during which the final manuscript was prepared.

Acknowledgments

We express our sincere gratitude to the two anonymous reviewers for their constructive comments, which immensely helped us improve the manuscript. We also thank Don Baker for his editorial work.

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Received: 2022-07-17
Accepted: 2022-12-22
Published Online: 2023-11-30
Published in Print: 2023-12-15

© 2023 by Mineralogical Society of America

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  2. Electrical properties of iron sulfide-bearing dunite under pressure: Effect of temperature, composition, and annealing time
  3. Gas-mediated trace element incorporation into rhyolite-hosted topaz: A synchrotron microbeam XAS study
  4. 10.2138/am-2023-8927
  5. A dunite fragment in meteorite Northwest Africa (NWA) 11421: A piece of the Moon’s mantle
  6. 10.2138/am-2023-9054
  7. Hydrogen bond symmetrization and high-spin to low-spin transition of ε-FeOOH at the pressure of Earth’s lower mantle
  8. CURIES: Compendium of uranium Raman and infrared experimental spectra
  9. S 2 − and S 3 − radicals and the S 4 2 − polysulfide ion in lazurite, haüyne, and synthetic ultramarine blue revealed by resonance Raman spectroscopy
  10. Efect of faceting on olivine wetting properties
  11. The obscuring efect of magma recharge on the connection of volcanic-plutonic rocks
  12. In-situ study of microstructures induced by the olivine to wadsleyite transformation at conditions of the 410 km depth discontinuity
  13. Effect of pre-existing crystals and melt homogeneity on the decompression-induced crystallization of hydrous rhyodacite magma
  14. Origin of clinopyroxene-ilmenite symplectites in mafic granulites from eastern parts of the Chotanagpur granite gneissic complex, East Indian shield
  15. Single-crystal analysis of La-doped pyromorphite [Pb5(PO4)3Cl]
  16. Crystal structure of calcium-ferrite type NaAlSiO4 up to 45 GPa
  17. Revision of the CaMgSi2O6-CO2 P-T phase diagram at 3–6 GPa
https://doi.org/10.2138/am-2022-8715
Keywords for this article
Clinopyroxene-ilmenite symplectite; high-pressure metamorphisim; CGGC; textural modeling; CSpace; XmapTools; Ti mobility

Articles in the same Issue

  1. Evidence for abundant organic matter in a Neoarchean banded iron formation
  2. Electrical properties of iron sulfide-bearing dunite under pressure: Effect of temperature, composition, and annealing time
  3. Gas-mediated trace element incorporation into rhyolite-hosted topaz: A synchrotron microbeam XAS study
  4. 10.2138/am-2023-8927
  5. A dunite fragment in meteorite Northwest Africa (NWA) 11421: A piece of the Moon’s mantle
  6. 10.2138/am-2023-9054
  7. Hydrogen bond symmetrization and high-spin to low-spin transition of ε-FeOOH at the pressure of Earth’s lower mantle
  8. CURIES: Compendium of uranium Raman and infrared experimental spectra
  9. S 2 − and S 3 − radicals and the S 4 2 − polysulfide ion in lazurite, haüyne, and synthetic ultramarine blue revealed by resonance Raman spectroscopy
  10. Efect of faceting on olivine wetting properties
  11. The obscuring efect of magma recharge on the connection of volcanic-plutonic rocks
  12. In-situ study of microstructures induced by the olivine to wadsleyite transformation at conditions of the 410 km depth discontinuity
  13. Effect of pre-existing crystals and melt homogeneity on the decompression-induced crystallization of hydrous rhyodacite magma
  14. Origin of clinopyroxene-ilmenite symplectites in mafic granulites from eastern parts of the Chotanagpur granite gneissic complex, East Indian shield
  15. Single-crystal analysis of La-doped pyromorphite [Pb5(PO4)3Cl]
  16. Crystal structure of calcium-ferrite type NaAlSiO4 up to 45 GPa
  17. Revision of the CaMgSi2O6-CO2 P-T phase diagram at 3–6 GPa
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