Cambrian Orogenic Belt in East Antarctica and Sri Lanka: Implications for Gondwana Assembly

Shiraishi, Kazuyuki; Ellis, David J.; Hiroi, Yoshikuni; Fanning, C. Mark; Motoyoshi, Yoichi; Nakai, Yutaka

doi:10.1086/629647

Cited by 245 publications

(127 citation statements)

References 16 publications

Supporting

Mentioning

120

Contrasting

Unclassified

Order By: Relevance

“…Because of less data of Archean to Mesoproterozoic detrital zircon ages from the SW terrane, the detrital provenance of these zircons is unclear. Minor detrital zircons showing Archean to Paleoproterozoic ages have been identified in metamorphic rocks from neighboring Gondwana terranes with dominant late Mesoproterozoic to Neoproterozoic ages such as the Yamato-Belgica Complex (Shiraishi et al, 1994(Shiraishi et al, , 2003 in East Antarctica, Alto Benfica Group and Molócuè Group (Macey et al, 2010) in Nampula Complex, all of which had been affected by the Pan-African metamorphism. Additionally, Jacobs et al (2015) expected the existence of a crustal block at the southern end of the TOAST according to the aeromagnetic signature.…”

Section: Discussionmentioning

confidence: 99%

Detrital zircon provenances for metamorphic rocks from southern Sør Rondane Mountains, East Antarctica: A new report of Archean to Mesoproterozoic zircons

Kitano

Osanai

Nakano

et al. 2016

Journal of Mineralogical and Petrological Sciences

View full text Add to dashboard Cite

The Sør Rondane Mountains in East Antarctica consist of the various metamorphic rocks and several plutonic rocks, which are related to formation of Gondwana supercontinent. In order to understand the detrital provenances, LA-ICP-MS zircon U-Pb dating were conducted from metamorphosed sedimentary rocks in southern Sør Rondane Mountains. Detrital cores with~990-730 Ma ages were recognized from zircons in the pelitic gneisses and calc-silicate rocks from Menipa, Imingfjella, Mefjell and Arden, while the pelitic gneiss from Tvihøgda exhibited the Archean to Mesoproterozoic ages of~2630-1060 Ma. The Neoproterozoic zircon ages are recognized not only from metamorphosed sedimentary rocks but also from metamorphosed igneous rocks distributed in the central and southern parts of the mountains. However, the Archean to Mesoproterozoic zircon ages are rare in these areas. The results imply the detrital zircons with the Neoproterozoic ages were probably derived from neighbouring igneous rocks (present metamorphosed igneous rocks), while those with Archean to Mesoproterozoic ages have clearly different provenances because of the lack in the Neoproterozoic components. This study suggests the possibility that southern Sør Rondane Mountains can be considered to be juvenile late Mesoproterozoic to Neoproterozoic terrane partly mixed with the Archean to Mesoproterozoic components.

show abstract

Section: Discussionmentioning

confidence: 99%

Detrital zircon provenances for metamorphic rocks from southern Sør Rondane Mountains, East Antarctica: A new report of Archean to Mesoproterozoic zircons

Kitano

Osanai

Nakano

et al. 2016

Journal of Mineralogical and Petrological Sciences

View full text Add to dashboard Cite

show abstract

“…The LHC is a Cambrian orogenic belt bounded by the Late Proterozoic to Cambrian Rayner Complex to the east and by the Late Proterozoic to Early Palaeozoic YamatoBelgica Complex to the west (Shiraishi et al, 1992(Shiraishi et al, , 1994(Shiraishi et al, , 2003 (Fig. 1).…”

Section: Geology Of Lützow-holm Complex (Lhc) At Skallevikshalsenmentioning

confidence: 99%

Linking P-T path with development of discontinuous phosphorus zoning in garnet during high-temperature metamorphism — an example from Lützow-Holm Complex, East Antarctica

Kawakami

Hokada

2010

Journal of Mineralogical and Petrological Sciences

View full text Add to dashboard Cite

Garnet porphyroblasts contained in the garnet -sillimanite gneiss from the Lützow -Holm Complex at Skallevikshalsen, East Antarctica, have a phosphorus -poor core and phosphorus -rich rim. The core/rim boundary of the phosphorus zoning is discontinuous. The irregular shape of this core/rim boundary together with the pressure difference between the core and the rim inferred from the difference in aluminosilicate inclusions (kyanite in the core and sillimanite in the rim) suggests that this is the resorption/reprecipitation boundary. The difference between phosphorus concentrations in the garnet core and rim is accompanied by a change in phosphate inclusions in the garnet. Apatite and monazite are included in the phosphorus -poor garnet core, whereas monazite alone is included in the phosphorus -rich garnet rim. Utilizing the core/rim boundary as a contemporaneous surface when comparing different garnet grains, the timing of the discontinuous phosphorus -zoning formation (and thus, the garnet resorption) and change in the phosphate assemblage can be correlated to the pressure -temperature path of the garnet -sillimanite gneiss. The phosphorus -poor core of the garnet mainly formed during the prograde stage in the kyanite to sillimanite stability fields under which apatite probably buffered the phosphorus -content of garnet, and the phosphorus -rich garnet rim possibly crystallized from the melt at the retrograde stage near the vapor saturated solidus under which monazite alone (without apatite) probably did not buffer the phosphorus -content of garnet. Garnet resorption occurred during the decompression stage between these two garnet growth stages.

show abstract

“…Several recent geochronological studies of the high-grade metamorphic rocks of the Lützow-Holm Complex suggest that the timing of metamorphism was at~520-560 Ma (Shiraishi et al, 1994;Hokada and Motoyoshi, 2006;Shiraishi et al, 2008). Fraser et al (2000) reported 517 Ma as the melt crystallization age.…”

Section: Geochronological Constraints From Other Gondwana Fragmentsmentioning

confidence: 99%

“…However, this model does not agree with the some of the geochronological or geological evidence (e.g., Shiraishi et al, 1997;Dunkley et al, 2014), such as the type and timing of metamorphism (Neoproterozoic UHT metamorphism) and province/protolith ages (~2.5 Ga). The Highland Complex of Sri Lanka can be petrologically and geochronologically correlated to the high-grade side of the Rundvågshetta and Skallevikshalsen regions of the Lützow-Holm Complex (Skallen Group) in East Antarctica (e.g., Shiraishi et al, 1994Shiraishi et al, , 1997Shiraishi et al, , 2008. Hence, based on the present results and a compilation of available geochronological and petrological datasets, the boundary between the Highland and Wanni Complexes must be an extension of the northern part of the Madurai Block and the boundary between the Skallen and Ongul Groups in East Antarctica (Fig.…”

Section: Tectonic Implicationsmentioning

confidence: 99%

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

View full text Add to dashboard Cite

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.

show abstract

Cambrian Orogenic Belt in East Antarctica and Sri Lanka: Implications for Gondwana Assembly

Cited by 245 publications

References 16 publications

Detrital zircon provenances for metamorphic rocks from southern Sør Rondane Mountains, East Antarctica: A new report of Archean to Mesoproterozoic zircons

Detrital zircon provenances for metamorphic rocks from southern Sør Rondane Mountains, East Antarctica: A new report of Archean to Mesoproterozoic zircons

Linking P-T path with development of discontinuous phosphorus zoning in garnet during high-temperature metamorphism — an example from Lützow-Holm Complex, East Antarctica

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

Contact Info

Product

Resources

About