Sulfide evolution in high-temperature to ultrahigh-temperature metamorphic rocks from Lützow-Holm Complex, East Antarctica

Kawakami, T., Ellis, D. J. and Christy, A. G. (2006) Sulfide evolution in high-temperature to ultrahigh-temperature metamorphic rocks from Lützow-Holm Complex, East Antarctica. Lithos, 92 3-4: 431-446. doi:10.1016/j.lithos.2006.03.057


Author Kawakami, T.
Ellis, D. J.
Christy, A. G.
Title Sulfide evolution in high-temperature to ultrahigh-temperature metamorphic rocks from Lützow-Holm Complex, East Antarctica
Journal name Lithos   Check publisher's open access policy
ISSN 0024-4937
1872-6143
Publication date 2006-12-01
Sub-type Article (original research)
DOI 10.1016/j.lithos.2006.03.057
Open Access Status Not yet assessed
Volume 92
Issue 3-4
Start page 431
End page 446
Total pages 16
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Abstract The high-temperature (HT) to ultrahigh-temperature (UHT) metamorphic rocks from Lützow-Holm Complex, East Antarctica show a systematic difference between sulfide assemblages in the rock matrix and those found as inclusions in the silicates stable in high-temperatures. Matrix sulfides are commonly pyrite with or without pentlandite and chalcopyrite. On the other hand, inclusion sulfides are pyrrhotite with or without pentlandite and chalcopyrite lamellae. When recalculated into integrated single-phase sulfide compositions, inclusion sulfides from the UHT region showed a wider range of solid-solution composition than the inclusion sulfides from the HT region. The host minerals of the sulfides with extreme solid-solution compositions are those stable at the peak of metamorphism such as orthopyroxene and garnet. One of the most extreme ones is included in orthopyroxene coexisting with sillimanite ± quartz, which is the diagnostic mineral assemblage of UHT metamorphism. These observations suggest that sulfide inclusions preserve their peak metamorphic compositions. Pyrrhotite did not revert to pyrite because of the closed system behavior of sulfur in inclusion sulfides. On the other hand, in the rock matrix where the open system behavior of sulfur is permitted, original sulfides were partly to completely altered by the later fluid activity.
Keyword Fluid
Inclusion
P-T path
Pyrrhotite
Sulfide
UHT metamorphism
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Earth and Environmental Sciences
 
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