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Ediacaran mafic magmatism recorded in Cambrian eclogites of the Ross orogen, Antarctica: Implications for the Neoproterozoic rifting episodes along the Pacific­Gondwana margin

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Title
Ediacaran mafic magmatism recorded in Cambrian eclogites of the Ross orogen, Antarctica: Implications for the Neoproterozoic rifting episodes along the Pacific­Gondwana margin
Other Titles
남극 로스 조산대의 캄브리아기 에클로자이트에 기록된 에디아카라기 고철질 화성활동: 태평양-곤드와나 주변부의 신원생대 열곡활동에의 의의
Authors
김태환
김윤섭
정원석
조문섭
Lee, Jong Ik
Keywords
Antarctic Ross orogenNeoproterozoic rift tectonicsPacific-Gondwana margin
Issue Date
2023
Citation
김태환, et al. 2023. "Ediacaran mafic magmatism recorded in Cambrian eclogites of the Ross orogen, Antarctica: Implications for the Neoproterozoic rifting episodes along the Pacific­Gondwana margin". TERRA NOVA, 35(1): 32-40.
Abstract
We report the first finding of Ediacaran mafic magmatism in northern Victoria Land of the Ross orogen, Antarctica, based on ca. 600-590 Ma magmatic zircon cores in Cambrian eclogites. The mafic magmatism could be either linked to ca. 615-590 Ma incipient convergent margin magmatism in central segment of the Ross orogen, or ca. 600-580 Ma continental rift-related volcanism widespread in eastern Australia. The latter is preferred based on the trace-element compositions distinctive from those of arc-related basalts and the depleted mantle-like Hf isotopic compositions of zircon. Our results suggest dual rifting episodes during both the Ediacaran and Cryogenian (ca. 670-650 Ma) in the East Antarctic margin, correlative with those in eastern Australia. A spatial distribution of coeval rifting and subduction along the Ediacaran margin of East Antarctica is readily accounted for by rift inheritance; the upper-and lower-plate geometry resulting from detachment and transform faulting.
URI
https://repository.kopri.re.kr/handle/201206/14301
DOI
http://dx.doi.org/10.1111/ter.12626
Type
Article
Station
Jang Bogo Station
Indexed
SCIE
Appears in Collections  
2022-2022, Mantle dynamics and tectonic evolutions of Zealandia-Antarctic domain (22-22) / Park, Sung Hyun (PE22050)
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