Prograde pressure-temperature records from inclusions in zircons from ultrahigh-pressure-high-pressure rocks of the Kokchetav Massif, northern Kazakhstan

I. Katayama, A. A. Zayachkovsky, S. Maruyama

Research output: Contribution to journalArticle

99 Citations (Scopus)

Abstract

In the first extensive, systematic study of inclusions in zircons from ultrahigh-pressure (UHP) and high-pressure (HP) metamorphic rocks of the Kokchetav Massif of Kazakhstan (separated from 232 rock samples from all representative lithologies and geographic regions), we identified graphite, quartz, garnet, phengite, phlogopite, rutile, albite, K-feldspar, amphibole, zoisite, kyanite, calcite, dolomite, apatite, monazite, omphacite and jadeite, as well as the diagnostic UHP metamorphic minerals (i.e. microdiamond and coesite) by laser Raman spectroscopy. In some instances, coesite + quartz and diamond + graphite occur together in a single rock sample, and inclusion aggregates also comprise polycrystalline diamond crystals overgrowing graphite. Secondary electron microscope and cathodoluminescence studies reveal that many zircons display distinct zonation textures, which comprise core and wide mantle, each with distinctive inclusion microassemblages. Pre-UHP metamorphic minerals such as graphite, quartz, phengite and apatite are common in the core, whereas diamond, coesite, garnet and jadeite occupy the mantle. The inclusions in core are irrelevant to the UHP metamorphism. The zircon core is of detrital or relatively low-grade metamorphic origin, whereas the mantle is of HP to UHP metamorphic origin. The zonal arrangement of inclusions and the presence of coesite and diamond without back-reaction imply that aqueous fluids were low to absent within the zircons during both prograde and retrograde metamorphism, and that the zircon preserves a prograde pressure-temperature record of the Kokchetav metamorphism which, elsewhere, has been more or less obliterated in the host rock.

Original languageEnglish
Pages (from-to)417-427
Number of pages11
JournalIsland Arc
Volume9
Issue number3
DOIs
Publication statusPublished - 2000
Externally publishedYes

Fingerprint

coesite
zircon
graphite
diamond
jadeite
phengite
rock
quartz
mantle
temperature
apatite
garnet
zoisite
ultrahigh pressure metamorphism
prograde metamorphism
retrograde metamorphism
omphacite
cathodoluminescence
kyanite
Raman spectroscopy

Keywords

  • Coesite
  • Diamond
  • Kokchetav Massif
  • Prograde pressure-temperature path
  • Ultrahigh-pressure metamorphism
  • Zircon

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

Prograde pressure-temperature records from inclusions in zircons from ultrahigh-pressure-high-pressure rocks of the Kokchetav Massif, northern Kazakhstan. / Katayama, I.; Zayachkovsky, A. A.; Maruyama, S.

In: Island Arc, Vol. 9, No. 3, 2000, p. 417-427.

Research output: Contribution to journalArticle

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