Newly found Tonian metamorphism in Akebono Rock, eastern Dronning Maud Land, East Antarctica

Baba, Sotaro; Horie, Kenji; Hokada, Tomokazu; Takehara, Mami; Kamei, Atsushi; Kitano, Ippei; Motoyoshi, Yoichi; Nantasin, Prayath; Setiawan, Nugroho Imam; Dashbaatar, Davaa-ochir

doi:10.1016/j.gr.2021.09.009

Cited by 9 publications

(6 citation statements)

References 79 publications

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“…the Lützow-Holm Complex, has previously attracted attention due to its exotic nature (Shiraishi et al, 2003(Shiraishi et al, , 2008Dunkley et al, 2014Dunkley et al, , 2020. Recently, Baba et al (2022) discovered new occurrence of Tonian-aged rocks from the Akebono Rock, neighboring the Hinode Block. Following this finding, Kitano et al (2023 in this issue) conducted a detailed U-Pb zircon dating on several rock units surrounding Hinode Block, and successfully obtained Tonian metamorphic ages from Akebono Rock and Niban Rock, which are located on the west and east sides of Hinode Block, expanding the regional distribution of Tonian-aged rocks in the region Mori et al (2023 in this issue), who have investigated the detailed metamorphic P-T conditions and metamorphic monazite ages of Niban-nishi Rock, summarize the P-T-t evolution of this particular locality, suggesting a possible overprint by Cambrian metamorphism.…”

Section: A C C E P T E D I N J M P S P R E -P R O O Fmentioning

confidence: 99%

Recent advances in mineralogy, petrology, geochemistry, and geochronology in East Antarctica

HOKADA,

SATISH-KUMAR,

KAWAKAMI

2024

Journal of Mineralogical and Petrological Sciences

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A prolonged crustal history from Archean through Proterozoic to Cambrian, spanning more than half of the Earth's evolution through time is preserved in the rock record in East Antarctica. Geological field studies have been conducted in Dronning Maud Land and Enderby Land of East Antarctica as part of the scientific program of Japanese Antarctic Research Expedition (JARE). Late Neoproterozoic to Cambrian (>600-520 Ma) high-grade metamorphic terranes, developed as major orogenic belts during the Gondwana supercontinent formation, are recognized in central Dronning Maud Land, Sør Rondane Mountains, Belgica and Yamato Mountains (Yamato-Belgica Complex), Lützow-Holm Bay-Prince Olav Coast region (Lützow-Holm Complex) to western Enderby Land (Western Rayner Complex) over 2000 km from west to east along the coast-inland of the Antarctic continent. Relatively narrow and sporadic Meso-Neoproterozoic (1000-900 Ma) high-grade blocks (Hinode Block and Nibannishi Rockgranulite-facies; Akebono Rockamphibolite-facies) are identified in Prince Olav Coast geographically within the Lützow-Holm Complex. Archean high-grade -UHT granulites and gneisses of the Napier Complex represent the largest regional terrain covering 400 x 200 km 2 area in Enderby Land, along with widespread Meso-Neoproterozoic granulite-facies zone of Rayner Complex from Enderby Land through Kemp Land, McRobertson Land toward east to Prydz Bay region. Thus, the continental crustal domain investigated by the Japanese Antarctic expeditions is key in understanding the Archean-Proterozoic-Cambrian deep crustal history and processes. In this special issue we summarize the recent progress in theA c c e p t e d i n J M P S P r e -p r o o f

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Section: A C C E P T E D I N J M P S P R E -P R O O Fmentioning

confidence: 99%

Recent advances in mineralogy, petrology, geochemistry, and geochronology in East Antarctica

HOKADA,

SATISH-KUMAR,

KAWAKAMI

2024

Journal of Mineralogical and Petrological Sciences

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“…This finding contrasts with the previous thought proposed by Hiroi et al (1991). In addition, a recent U-Pb zircon study by Baba et al (2022) suggests that the central Prince Olav coastal area experienced a Tonian (937Ma)-aged, amphibolite-facies metamorphic event. These recent studies indicate to us that the previously accepted view of a progressive increase in metamorphic grade across this region needs to be reconsidered and that the metamorphic history of the LHC is almost certainly more complex than previously assumed.…”

Section: A C C E P T E D I N J M P S P R E -P R O O Fmentioning

confidence: 99%

“…Instrument operating conditions of XRF spectrometers are given in Kimura and Yamada (1996). Detailed procedures of these analyses were described in Baba et al (2022).…”

Section: A C C E P T E D I N J M P S P R E -P R O O Fmentioning

confidence: 99%

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Counter-clockwise <i>P-T</i> history deduced from kyanite-bearing pelitic gneiss in Tenmondai Rock, Lützow-Holm Complex, East Antarctica

Baba

Nantasin

Kamei

et al. 2023

Journal of Mineralogical and Petrological Sciences

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This paper first reports the counter-clockwise pressure-temperature (P-T) path for the Lützow-Holm Complex in East Antarctica. The metamorphic textures of kyanite-bearing pelitic gneisses from Tenmondai Rock including earlier spinel and ilmenite inclusions, geothermobarometric data, and pseudosection modeling indicate that the pressure increases prior to the peak metamorphic conditions at around 9 ± 0.5 kbar and 770-820 °C, followed by cooling to kyanitestability field. We conclude that these gneisses, underwent granulite-facies metamorphism with a counter-clockwise P-T path, but this contrasts with the widely recognized clockwise P-T path of the Lützow-Holm Complex basement rocks in general. One plausible hypothesis we proposed could be that this counter-clockwise P-T path originated from magmatism with late compression and the rocks of the different structural levels are juxtaposed, while acknowledging that this hypothesis conflicts with previous studies and that further work is needed to clarify these issues.

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“…The age of peak metamorphism in the Lützow-Holm Complex is between 553 ± 6 Ma and 521 ± 9 Ma, as inferred from SHRIMP U-Pb zircon data (Shiraishi et al, 1994(Shiraishi et al, , 2008Mori et al, 2023). However, electron microprobe monazite geochronology and LA-ICP-MS U-Pb zircon dating also provided evidence for an older population of ages around ~ 650-580 Ma (Hokada and Motoyoshi, 2006;Kawakami et al, 2006), whereas recent studies also report sporadic occurrences of Tonian metamorphic event without Cambrian overprints in LHC (Baba et al, 2022;Kitano et al, 2023).…”

Section: Geological Background Of Lützow Holm Complexmentioning

confidence: 99%

Carbon isotopic composition of graphite in metamorphic rocks from Lützow-Holm Complex, East Antarctica: Implications for carbon geodynamic cycle in continental crust

SATISH-KUMAR

2023

Journal of Mineralogical and Petrological Sciences

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type graphite. Thus, carbon is recycled and retained as graphite in the continental crust during high-grade metamorphism and anatexis, though its isotopic composition can be considerably modified during orogenesis. In summary, a comprehensive study of carbon isotopic composition of graphite occurrences in the Lützow-Holm Complex, East Antarctica has thus revealed that prograde metamorphism, anatexis and interaction between carbonate lithologies with silicate rocks can modify carbon isotopic composition of graphite in the continental crust.Recycling of carbon within the continental crust during orogenesis where graphite act as "longterm sinks" of carbon has to be considered for envisaging realistic models on Earth's carbon cycle.

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Newly found Tonian metamorphism in Akebono Rock, eastern Dronning Maud Land, East Antarctica

Cited by 9 publications

References 79 publications

Recent advances in mineralogy, petrology, geochemistry, and geochronology in East Antarctica

Recent advances in mineralogy, petrology, geochemistry, and geochronology in East Antarctica

Counter-clockwise <i>P-T</i> history deduced from kyanite-bearing pelitic gneiss in Tenmondai Rock, Lützow-Holm Complex, East Antarctica

Carbon isotopic composition of graphite in metamorphic rocks from Lützow-Holm Complex, East Antarctica: Implications for carbon geodynamic cycle in continental crust

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