Sr and Nd isotopic evidence in metacarbonate rocks for an extinct island arc-ocean system in East Antarctica

Naho Otsuji, M. Satish-Kumar, Atsushi Kamei, Eiichi Takazawa, Noriyoshi Tsuchiya, G. H. Grantham, Tetsuo Kawakami, Masahiro Ishikawa, Yasuhito Osanai

研究成果: ジャーナルへの寄稿記事

3 引用 (Scopus)

抄録

Chemically precipitated carbonate sediments directly record seawater composition that helps to decode the Earth's paleo-environment, the existence of paleo-oceans, and provide valuable clues on the paleo-tectonic position of continents through Earth's history. In addition, the geochemical and isotopic composition of carbonate rocks have a strong dependence on the depositional tectonic setting and surrounding source rock composition. This was particularly important in the Precambrian, during which biological activity was less prominent and vegetation was virtually absent. Here we present evidence for the existence of an extinct East Antarctic Ocean and its peripheral oceanic island arc system that preceded the formation of the East Antarctic continent in the Neoproterozoic before the final assembly of Gondwana. Applying a multi-element isotope geochemical approach on chemostratigraphically well-constrained metacarbonate rocks collected from the remote Sør Rondane Mountains in East Antarctica, we present a model on carbonate deposition surrounding an island arc system, mid-ocean volcanic islands and a shallow marine continental shelf of a yet unidentified interior Antarctic continent, all of which accreted in the late Neoproterozoic to early Paleozoic to form the present day East Antarctic continent prior to the final amalgamation of Gondwana supercontinent. Our results support the presence of an oceanic island arc system that might have separated the Mozambique ocean and East Antarctic ocean.

元の言語英語
ページ(範囲)170-180
ページ数11
ジャーナルJournal of Mineralogical and Petrological Sciences
111
発行部数3
DOI
出版物ステータス出版済み - 7 22 2016

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island arcs
Antarctic regions
continents
island arc
Antarctic Ocean
oceans
rocks
carbonates
ocean
Gondwana
rock
tectonics
Mozambique
Earth environment
volcanic island
carbonate sediment
supercontinent
continental shelves
activity (biology)
vegetation

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geology

これを引用

Sr and Nd isotopic evidence in metacarbonate rocks for an extinct island arc-ocean system in East Antarctica. / Otsuji, Naho; Satish-Kumar, M.; Kamei, Atsushi; Takazawa, Eiichi; Tsuchiya, Noriyoshi; Grantham, G. H.; Kawakami, Tetsuo; Ishikawa, Masahiro; Osanai, Yasuhito.

:: Journal of Mineralogical and Petrological Sciences, 巻 111, 番号 3, 22.07.2016, p. 170-180.

研究成果: ジャーナルへの寄稿記事

Otsuji, N, Satish-Kumar, M, Kamei, A, Takazawa, E, Tsuchiya, N, Grantham, GH, Kawakami, T, Ishikawa, M & Osanai, Y 2016, 'Sr and Nd isotopic evidence in metacarbonate rocks for an extinct island arc-ocean system in East Antarctica', Journal of Mineralogical and Petrological Sciences, 巻. 111, 番号 3, pp. 170-180. https://doi.org/10.2465/jmps.151029a
Otsuji, Naho ; Satish-Kumar, M. ; Kamei, Atsushi ; Takazawa, Eiichi ; Tsuchiya, Noriyoshi ; Grantham, G. H. ; Kawakami, Tetsuo ; Ishikawa, Masahiro ; Osanai, Yasuhito. / Sr and Nd isotopic evidence in metacarbonate rocks for an extinct island arc-ocean system in East Antarctica. :: Journal of Mineralogical and Petrological Sciences. 2016 ; 巻 111, 番号 3. pp. 170-180.
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