Osumilite and a spinel+quartz association in garnet–sillimanite gneiss from Rundvågshetta, Lützow-Holm Complex, East Antarctica

Kawasaki, Toshisuke; Nakano, Nobuhiko; Osanai, Yasuhito

doi:10.1016/j.gr.2010.07.008

Cited by 45 publications

(40 citation statements)

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“…In summary, multiple metamorphic zircon growth and mineral assemblages along with their protolith ages convincingly show the Highland Complex correlates well with the Madurai and Trivandrum Blocks of southern India, extending to high-grade portions of the Lützow-Holm complex (Skallen Group) with metamorphic conditions up to UHT (e.g., Tadokoro et al, 2007;Yoshimura et al, 2008;Brandt et al, 2011;Kawasaki et al, 2011). Based on a compilation of newly available results including those presented here, we propose that the several terranes in southern Madagascar (south of Ranotsara Shear Zone), the Madurai and Trivandrum Blocks of southern India, the Highland Complex of Sri Lanka, and the Skallen group of East Antarctica indicate a unique terrane that metamorphosed by the EdiacaranCambrian regional UHT event during the amalgamation of the Gondwana supercontinent.…”

Section: Tectonic Implicationsmentioning

confidence: 77%

“…Mg-Al Spr + Qz bearing assemblages within garnet porphyroblasts are identified from the Highland Complex of Sri Lanka (Sajeev and Osanai, 2004a;Osanai et al, 2006), the Skallen Group in the Lützow-Holm Complex of East Antarctica (Yoshimura et al, 2008), the Madurai Block of southern India (Tateishi et al, 2004;Brandt et al, 2011), and Andriamena in northwestern Madagascar (Goncalves et al, 2004) and Imanombo in southern Madagascar (Jöns and Schenk, 2011). Another rare assemblage, Spl + Qz, is also reported in most of these terranes (e.g., Kawakami and Motoyoshi, 2004;Morimoto et al, 2004;Sajeev and Osanai 2004b;Tadokoro et al 2007;Kawasaki et al, 2011;Jöns and Schenk, 2011). Although the Spr + Qz assemblage is not identified from the Trivandrum Block of southern India, the Spl + Qz assemblage has been reported in this block (Morimoto et al, 2004;Tadokoro et al, 2007).…”

Section: Tectonic Implicationsmentioning

confidence: 93%

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UHT granulites of the Highland Complex, Sri Lanka II: Geochronological constraints and implications for Gondwana correlation

Osanai

Sajeev²,

Nakano

et al. 2016

Journal of Mineralogical and Petrological Sciences

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The regional ultrahigh-temperature (UHT) metamorphism of the Highland Complex, Sri Lanka is well established and has an important role in our understanding of the tectonic history of the Gondwana supercontinent. U-Pb zircon dating of sapphirine-bearing Mg-Al granulites yielded two major metamorphic age populations at approximately 620-590 and 563-525 Ma with no evidence of older zircon cores. Pelitic granulite samples with a Grt-Sil-Spl-Crd assemblage have similar metamorphic ages with concordant data clusters at~602, 563, and 526 Ma and inherited zircon cores aged from 2040 to 1600 Ma. The pelitic granulites also underwent two stages of metamorphism (565-520 and 622-580 Ma). Some of these pelitic granulite samples have inherited zircon cores ranging from 3060 to 760 Ma. Zircons in mafic granulite samples have age ranges of 566-533 and 620-578 Ma. A calc-silicate granulite sample also has similar age populations at 591, 541, and 524 Ma. Combining these new results with previously published ages from Sri Lanka and formerly adjacent continental fragments of Gondwana, we propose that the terranes in southern Madagascar (south of Ranotsara Shear Zone), Northern and Southern Madurai and the Trivandrum Blocks of southern India, the Highland Complex of Sri Lanka, and the Skallen Group in the Lützow-Holm Complex of East Antarctica represent a unique metamorphic belt that regionally experienced the Ediacaran-Cambrian UHT event during the amalgamation of the Gondwana supercontinent.

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Section: Tectonic Implicationsmentioning

confidence: 77%

Section: Tectonic Implicationsmentioning

confidence: 93%

UHT granulites of the Highland Complex, Sri Lanka II: Geochronological constraints and implications for Gondwana correlation

Osanai

Sajeev²,

Nakano

et al. 2016

Journal of Mineralogical and Petrological Sciences

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“…The geological outline of Rundvågshetta was given by Motoyoshi et al (1986). The diagnostic mineral assemblages of ul-trahigh-temperature metamorphism, including spinel + quartz (Motoyoshi et al, 1985), orthopyroxene + sillimanite + quartz (Kawasaki et al, 1993;Motoyoshi and Ishikawa, 1997), sapphirine + quartz (Yoshimura et al, 2008) and osumilite (Kawasaki et al, 2011), were found from this area.…”

Section: Applications To Ultrahigh-temperature Granulitesmentioning

confidence: 86%

“…We apply the present Ti-in-garnet thermometer to estimate the metamorphic conditions of Antarctic ultrahigh-temperature granulites from Tonagh Island (Harley, 1987(Harley, , 1998a(Harley, , 1998bOsanai et al, 1999;Hokada et al, 1999) and McIntyre Island (Motoyoshi, 1995;Kawasaki and Motoyoshi, 2000;Kawasaki et al, 2002) in the Napier Complex (Harley and Hensen, 1990), and those from Rundvågshetta (Motoyoshi et al, 1985;Kawasaki et al, 1993;Motoyoshi and Ishikawa, 1997;Harley, 1998aHarley, , 1998bKawasaki and Motoyoshi, 2006;Yoshimura et al, 2008;Kawasaki et al, 2011) and Skallevikshalsen (Harley, 1985). Open circle 'Ha87', 980°C and 7 kbar (Harley, 1987).…”

Section: Applications To Ultrahigh-temperature Granulitesmentioning

confidence: 99%

Ti–in–garnet thermometer for ultrahigh–temperature granulites

Kawasaki

Motoyoshi

2016

Journal of Mineralogical and Petrological Sciences

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We propose a Ti-in-garnet thermometer for ultrahigh-temperature granulites calibrated from experimentally reversed data of the TiO 2 solubility in garnet coexisting with orthopyroxene, rutile and quartz at pressures 7-23 kbar and temperatures 850-1300°C. We confirm that the combined substitution Ti where N is the number of cation per formula unit based on a 12-oxygen atom normalisation. Temperature T and pressure P are given in Kelvin and kbar, respectively. The present thermometer is useful to estimate metamorphic conditions. This new thermometer is applied to natural garnet in geologically and petrologically well-characterised Antarctic ultrahigh-temperature granulites. The resultant pressure and temperature estimates are consistent with those reported from granulites of these areas.

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“…the Lützow-Holm Complex, East Antarctica (e.g., Yoshimura et al, 2008;Kawasaki et al, 2011). In the Lützow-Holm Complex, UHT conditions were also obtained from aluminous granulite occurring in the Akarui Point, which yielded 920°C at 0.5 GPa (Iwamura et al, 2013).…”

Section: Uht Metamorphic Conditionsmentioning

confidence: 99%

UHT granulites of the Highland Complex, Sri Lanka I: Geological and petrological background

Osanai

Sajeev²,

Nakano

et al. 2016

Journal of Mineralogical and Petrological Sciences

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The ultrahigh-temperature (UHT) regional metamorphism of Sri Lanka has a significant role in understanding the tectonics and formation of the Gondwana supercontinent. Sri Lanka is specifically important because of its central position in Gondwana, located between southern India, Madagascar and eastern Antarctica. In particular, the Highland Complex has been the focus of several previous studies because of the prominence of metasedimentary rocks that experienced UHT metamorphism. The central Highland Complex of Sri Lanka consists of Spr-bearing Mg-Al rich granulites intercalated with other pelitic, mafic granulites and calc-silicates, which preserve several textural evidences for UHT metamorphism. The calculated peak metamorphic conditions for the Mg-Al rich granulite yielded a temperature range from 910 to 1005°C at 1.0 GPa, and the pressure varies between 0.9 to 1.2 GPa. The estimated metamorphic P-T conditions and evolution path is in good agreement with previous studies and also to that of similar rock-types from southern Madagascar, southern India and East Antarctica.

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Osumilite and a spinel+quartz association in garnet–sillimanite gneiss from Rundvågshetta, Lützow-Holm Complex, East Antarctica

Cited by 45 publications

References 40 publications

UHT granulites of the Highland Complex, Sri Lanka II: Geochronological constraints and implications for Gondwana correlation

UHT granulites of the Highland Complex, Sri Lanka II: Geochronological constraints and implications for Gondwana correlation

Ti–in–garnet thermometer for ultrahigh–temperature granulites

UHT granulites of the Highland Complex, Sri Lanka I: Geological and petrological background

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