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Controls of P-T path and element mobility on the formation of corundum pseudomorphs in Paleoproterozoic high-pressure anorthosite from Sittampundi, Tamil Nadu, India

  • Priyadarshi Chowdhury , Moumita Talukdar , Pulak Sengupta EMAIL logo , Sanjoy Sanyal and Dhruba Mukhopadhyay
Published/Copyright: March 7, 2015
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American Mineralogist
From the journal American Mineralogist Volume 98 Issue 10

Abstract

The Archaean Sittampundi Layered Magmatic Complex (SLC) of south India is interpreted as a part of the oceanic crust that formed in a suprasubduction zone setting. The assemblage corundum + anorthite + amphibole (magnesiohornblende to tschermakite to pargasite) + clinozoisite (C1PACz) developed in highly calcic anorthosite of the SLC at the culmination of a ca. 2.46 Ga tectonothermal event. Changing physicochemical conditions during this early Paleoproterozoic (Siderian) event produced spinel + anorthite + second generation amphibole through destabilization of corundum + first generation amphibole. Spinel retains the shape of the corundum that it replaces (spinel pseudomorphing corundum, SCP) and is surrounded by a rind of plagioclase that separates spinel from the matrix amphibole. Development of the assemblage chlorite + clinozoisite + secondary corundum after spinel + anorthite + amphibole marks the terminal metamorphic event in this area. Mass-balance calculations on pseudomorphs and modeling of preserved reaction textures show that Na, Mg, Ca, and silica were mobile during the formation of the SCP. Al and Fe were mobile at the grain scale but remained immobile in the scale of a thin section. Activity adjusted partial petrogenetic grid in the systems Na2O-CaO-Al2O3-SiO2-H2O (NCASH) and Na2O-CaO-MgO-Al2O3-SiO2-H2O (NCMASH) along with the mineralogy of the rocks that were co-metamorphosed with the anorthosite show that (1) the assemblage C1PACz was formed during high-pressure metamorphism (11 ± 1 kbar and 725 ± 25 °C), (2) SCP and the plagioclase rind around it were formed during exhumation of these higher pressure rocks to lower pressure (7 ± 1 kbar, 675 ± 50 °C) along a steeply decompressive retrograde P-T path, and (3) post decompression cooling and hydration at near isobaric condition triggered the formation of the chlorite-clinozoisite-secondary corundum assemblage (6-8 kbar, <620 °C). The inferred P-T path is consistent with the view that the studied area that represents Archaean oceanic crust of SSZ affinity was subducted and subsequently exhumed during the early Paleoproterozoic orogeny.

Keywords : Sittampundi; anorthosite; corundum pseudomorph; oceanic crust; subduction zone
Received: 2012-9-15
Accepted: 2013-5-7
Published Online: 2015-3-7
Published in Print: 2013-10-1

© 2015 by Walter de Gruyter Berlin/Boston

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  2. Versatile monazite: Resolving geological records and solving challenges in materials science. Petrogenesis of the Kulyk Lake monazite-apatite-Fe(Ti)-oxide occurrence revealed using in-situ LA-(MC)-ICP-MS trace element mapping, U-Pb dating, and Sm-Nd isotope systematics on monazite
  3. Amorphous Materials: Properties, structure, and durability. Analysis of H2O in silicate glass using attenuated total reflectance (ATR) micro-FTIR spectroscopy
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https://doi.org/10.2138/am.2013.4350
Keywords for this article
Sittampundi; anorthosite; corundum pseudomorph; oceanic crust; subduction zone

Articles in the same Issue

  1. Review article. The crystal structure and vibrational spectroscopy of jarosite and alunite minerals
  2. Versatile monazite: Resolving geological records and solving challenges in materials science. Petrogenesis of the Kulyk Lake monazite-apatite-Fe(Ti)-oxide occurrence revealed using in-situ LA-(MC)-ICP-MS trace element mapping, U-Pb dating, and Sm-Nd isotope systematics on monazite
  3. Amorphous Materials: Properties, structure, and durability. Analysis of H2O in silicate glass using attenuated total reflectance (ATR) micro-FTIR spectroscopy
  4. Unlocking the secrets of Al-tobermorite in Roman seawater concrete
  5. The determination of hydrogen positions in superhydrous phase B
  6. Carlfrancisite: Mn3 2+(Mn2+,Mg,Fe3+,Al)42(As3+O3)2(As5+O4)4[(Si,As5+)O4]6[(As5+,Si)O4]2(OH)42, a new arseno-silicate mineral from the Kombat mine, Otavi Valley, Namibia
  7. Petrology and geochemistry of lunar granite 12032,366-19 and implications for lunar granite petrogenesis
  8. Extreme fractionation from zircon to hafnon in the Koktokay No. 1 granitic pegmatite, Altai, northwestern China
  9. Controls of P-T path and element mobility on the formation of corundum pseudomorphs in Paleoproterozoic high-pressure anorthosite from Sittampundi, Tamil Nadu, India
  10. Aluminum speeds up the hydrothermal alteration of olivine
  11. Iron pairs in beryl: New insights from electron paramagnetic resonance, synchrotron X-ray absorption spectroscopy, and ab initio calculations
  12. Effects of fluid and melt density and structure on high-pressure and high-temperature experimental studies of hydrogen isotope partitioning between coexisting melt and aqueous fluid
  13. DFT simulation of the occurrences and correlation of gold and arsenic in pyrite
  14. Crystal structure and hydration/dehydration behavior of Na2Mg(SO4)2·16H2O: A new hydrate phase observed under Mars-relevant conditions
  15. The diffusion behavior of hydrogen in plagioclase feldspar at 800–1000 °C: Implications for re-equilibration of hydroxyl in volcanic phenocrysts
  16. Quantification of dissolved CO2 in silicate glasses using micro-Raman spectroscopy
  17. Spin transition of Fe2+ in ringwoodite (Mg,Fe)SiO4 at high pressures
  18. P-V-T relations of γ-Ca3(PO4)2 tuite determined by in situ X-ray diffraction in a large-volume high-pressure apparatus
  19. Bonding and electronic changes in rhodochrosite at high pressure
  20. Growth of calcium carbonate in the presence of Se(VI) in silica hydrogel
  21. Thermodynamic properties of saponite, nontronite, and vermiculite derived from calorimetric measurements
  22. Far-infrared spectra of synthetic dioctahedral muscovite and muscovite–tobelite series micas: Characterization and assignment of the interlayer I–Oinner and I–Oouter stretching bands
  23. Phosphorus partitioning between olivine and melt: An experimental study in the system Mg2SiO4-Ca2Al2Si2O9-NaAlSi3O8-Mg3(PO4)2
  24. Olivine from spinel peridotite xenoliths: Hydroxyl incorporation and mineral composition
  25. Determination of the melting temperature of kaolinite by means of the Z-method
  26. Darrellhenryite, Na(LiAl2)Al6(BO3)3Si6O18(OH)3O, a new mineral from the tourmaline supergroup
  27. Nizamoffite, Mn2+Zn2(PO4)2(H2O)4, the Mn analogue of hopeite from the Palermo No. 1 pegmatite, North Groton, New Hampshire
  28. Mcalpineite from the Gambatesa mine, Italy, and redefinition of the species
  29. Rossiantonite, Al3(PO4)(SO4)2(OH)2(H2O)10·4H2O, a new hydrated aluminum phosphatesulfate mineral from Chimanta massif, Venezuela: Description and crystal structure
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