The oldest mid-oceanic carbonate buildup complex: Setting and lithofacies of the Vendian (Late Neoproterozoic) Baratal limestone in the Gorny Altai Mountains, Siberia

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概要

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• The Baratal limestone in the Gorny Altai Mountains, southern Siberia, occurs as large allochthonous blocks within a Cambrian accretionary complex that developed around the Siberia craton. Before the final accretion to Siberia in the Cambrian, the terrigenous clastic-free Baratal limestone was deposited directly upon a basaltic basement with a geochemical signature identical to that of modern oceanic plateau. The Baratal limestone with 598±25 Ma (Early Vendian) Pb-Pb isochron age consists of three distinct facies; 1) massive lime mudstone with ooids and stromatolites, 2) bedded lime mudstone, and 3) limestone conglomerate/breccia dominated by ooid-bearing lime mudstone clasts. The first represents a shallow marine environment on top of an ancient oceanic plateau, while the latter two represent the deeper slope to bottom-of-slope facies of a plateau. The Vendian Baratal limestone provides the oldest example of a reconstructed shallow marine carbonate buildup complex developed on a plateau/seamount in a mid-ocean. (Communicated by Tatsuro MATSUMOTO, M.J.A.)

• 日本学士院の論文

著者

• Isozaki Yukio

  Dept. Earth Science & Astronomy Univ.

• Maruyama Shigenori

  Dept. Earth and Planetary Sciences, Tokyo Institute of Technology

• UCHIO Yuko

  Dept. Earth and Planetary Science, Tokyo Institute of Technology

• OTA Tsutomu

  Dept. Earth and Planetary Science, Tokyo Institute of Technology

• UTSUNOMIYA Atsushi

  Dept. Earth and Planetary Science, Tokyo Institute of Technology

• BUSLOV Mikhail

  United Institute of Geology, Geophysics and Mineralogy, Siberian Branch of Russian Academy of Scienc

• BUSLOV Mikhail

  United Institute of Geology, Geophysics and Mineralogy, Siberian Branch of Russian Academy of Science

• ISOZAKI Yukio

  Dept. Earth Science and Astronomy, University of Tokyo

• MARUYAMA Shigenori

  Dept. Earth and Planetary Science, Tokyo Institute of Technology

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• The oldest mid-oceanic carbonate buildup complex: Setting and lithofacies of the Vendian (Late Neoproterozoic) Baratal limestone in the Gorny Altai Mountains, Siberia

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