Startseite Compositional characteristics and paragenetic relations of magnesiohögbomite in aluminous amphibolites from the Belomorian complex, Baltic Shield, Russia
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Compositional characteristics and paragenetic relations of magnesiohögbomite in aluminous amphibolites from the Belomorian complex, Baltic Shield, Russia

  • Pulak Sengupta , Michael M. Raith EMAIL logo und Valeri I. Levitsky
Veröffentlicht/Copyright: 28. März 2015
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 89 Heft 5-6

Abstract

This study investigates the compositional characteristics, parageneses, and stability relations of some högbomite-bearing assemblages in coarse-grained corundum-garnet amphibolites from a blackwall zone that separates troctolitic metagabbro from kyanite-bearing paragneiss at Diadina Mountain, Belomorian Belt, Russia. The blackwall zone presumably was formed through infiltration driven metasomatism during the Svecofennian metamorphic event at ~1.9 Ga. Euhedral högbomite grains (up to 15 mm in size) occur in domains of coarse tschermakitic amphibole, biotite, and spinel with minor rutile and ilmenite in the two blackwall varieties having contrasting bulk compositions. The other minerals in the two associations include corundum + garnet ± cordierite + chlorite + plagioclase + carbonate and spinel ± gedrite + sapphirine + chlorite + carbonate.

The studied högbomite belongs to the magnesiohögbomite-2N3S polysome type [P3̅m1 with a = 5.721(1) Å, c = 23.045(1) Å] and exhibits compositions that are poor in Zn (0.05-0.42 wt% ZnO) and Ni (0.20-0.50 wt% NiO) [(Fe2+ 2.7−3.1Mn0.01Ni0.04-0.1Zn0.01-0.1)Mg4.8-3.7(Al18.1-18.8Cr0.1-0.2Fe3+0.4-0.9)Ti1.6-1.2O38(OH)2]. Compositional variation is controlled by the substitution Ti4+ + R2+ ↔ 2R3+. Systematic partitioning data for Fe2+, Mg, and Zn indicate attainment of chemical equilibrium between magnesiohögbomite and the associated minerals (Spl, Hbl, Ged, Grt, Spr, Bt) on the thin section scale. Textural relations suggest growth of magnesiohögbomite under amphibolite-facies conditions (6 ± 1 kbar, 600 ± 50 °C) through complex mineral-fluid equilibria involving oxide (Crn, Spl, Rt, Ilm), silicate (Am, Bt, Spr), and carbonate (Cal, Dol, Mgs) phases. A partial logfO₂-logfS2 diagram for the system FeO-Al2O3-TiO2-O2-S2-H2O shows that growth of magnesiohögbomite from Crn + Ilm and Spl + Rt is restricted to a narrow fO₂-window and low fS2. The topological constraints, together with petrological data, suggest that magnesiohögbomite is formed in titanian and aluminous protoliths under greenschist-to amphibolite-facies conditions if fH2O is high, fS2 low, and fO₂ is defined by the paragenesis ilmenite + rutile + magnetite

Received: 2003-8-3
Accepted: 2004-1-19
Published Online: 2015-3-28
Published in Print: 2004-5-1

© 2015 by Walter de Gruyter Berlin/Boston

Artikel in diesem Heft

  1. Raman spectroscopy of Fe-Ti-Cr-oxides, case study: Martian meteorite EETA79001
  2. Evidence for exclusively inorganic formation of magnetite in Martian meteorite ALH84001
  3. Structural reinvestigation of getchellite As0.98Sb1.02S3.00
  4. Mineral distribution in contact-metamorphosed siliceous dolomite at Ubehebe Peak, California, based on airborne imaging spectrometer data
  5. Morphological consequences of differential Mg2+incorporation at structurally distinct steps on calcite
  6. Coutinhoite, a new thorium uranyl silicate hydrate, from Urucum mine, Galiléia, Minas Gerais, Brazil
  7. Nature and origin of lamellar magnetism in the hematite-ilmenite series
  8. Reaction rim growth on olivine in silicic melts: Implications for magma mixing
  9. Magmatic srilankite (Ti2ZrO6) in gabbroic vein cutting oceanic peridotites: An unusual product of peridotite-melt interactions beneath slow-spreading ridges
  10. The atomic structure of bakerite and its relationship to datolite
  11. Ca-Mg and K-Mg mixing around non-bridging O atoms in silicate glasses: An investigation using 17O MAS and 3QMAS NMR
  12. The fate of structure-bound Mn2+during the decomposition of dolomite and in the resulting conversion products: An EPR study
  13. A XANES determination of the oxidation state of chromium in silicate glasses
  14. Diffusion of C and O in calcite from 0.1 to 200 MPa
  15. The flux growth of magnesium silicate perovskite single crystals
  16. Anomalous rheology of peraluminous melts
  17. Compositional characteristics and paragenetic relations of magnesiohögbomite in aluminous amphibolites from the Belomorian complex, Baltic Shield, Russia
  18. The behavior of Li and B during planetary basalt crystallization
  19. Anorogenic Gross Spitzkoppe granite stock in central western Namibia: Part I. Petrology and geochemistry
  20. Anorogenic Gross Spitzkoppe granite stock in central western Namibia: Part II. Structures and textures indicating crystallization from undercooled melt
  21. Aluminian low-Ca pyroxene in a Ca-Al-rich chondrule from the Semarkona meteorite
  22. A low-load, high-temperature deformation apparatus for volcanological studies
  23. Minimum XPS core-level line widths of insulators, including silicate minerals
  24. Ferri-ottoliniite and ferriwhittakerite, two new end-members of the new Group 5 for monoclinic amphiboles
https://doi.org/10.2138/am-2004-5-617

Artikel in diesem Heft

  1. Raman spectroscopy of Fe-Ti-Cr-oxides, case study: Martian meteorite EETA79001
  2. Evidence for exclusively inorganic formation of magnetite in Martian meteorite ALH84001
  3. Structural reinvestigation of getchellite As0.98Sb1.02S3.00
  4. Mineral distribution in contact-metamorphosed siliceous dolomite at Ubehebe Peak, California, based on airborne imaging spectrometer data
  5. Morphological consequences of differential Mg2+incorporation at structurally distinct steps on calcite
  6. Coutinhoite, a new thorium uranyl silicate hydrate, from Urucum mine, Galiléia, Minas Gerais, Brazil
  7. Nature and origin of lamellar magnetism in the hematite-ilmenite series
  8. Reaction rim growth on olivine in silicic melts: Implications for magma mixing
  9. Magmatic srilankite (Ti2ZrO6) in gabbroic vein cutting oceanic peridotites: An unusual product of peridotite-melt interactions beneath slow-spreading ridges
  10. The atomic structure of bakerite and its relationship to datolite
  11. Ca-Mg and K-Mg mixing around non-bridging O atoms in silicate glasses: An investigation using 17O MAS and 3QMAS NMR
  12. The fate of structure-bound Mn2+during the decomposition of dolomite and in the resulting conversion products: An EPR study
  13. A XANES determination of the oxidation state of chromium in silicate glasses
  14. Diffusion of C and O in calcite from 0.1 to 200 MPa
  15. The flux growth of magnesium silicate perovskite single crystals
  16. Anomalous rheology of peraluminous melts
  17. Compositional characteristics and paragenetic relations of magnesiohögbomite in aluminous amphibolites from the Belomorian complex, Baltic Shield, Russia
  18. The behavior of Li and B during planetary basalt crystallization
  19. Anorogenic Gross Spitzkoppe granite stock in central western Namibia: Part I. Petrology and geochemistry
  20. Anorogenic Gross Spitzkoppe granite stock in central western Namibia: Part II. Structures and textures indicating crystallization from undercooled melt
  21. Aluminian low-Ca pyroxene in a Ca-Al-rich chondrule from the Semarkona meteorite
  22. A low-load, high-temperature deformation apparatus for volcanological studies
  23. Minimum XPS core-level line widths of insulators, including silicate minerals
  24. Ferri-ottoliniite and ferriwhittakerite, two new end-members of the new Group 5 for monoclinic amphiboles
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