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ID 117707
Title Alternative
Izanami Plateau : Japan's Triassic low latitude carbonates
Author
Hirsch, Francis Geological Survey of Israel
Keywords
Triassic
Izanami plateau
Japan
pelagic carbonates
seamount
hot-spot
accretionary complexes
conodonts
Content Type
Journal Article
Description
The Izanami plateau is the oceanic origin of Triassic pelagic limestones in Jurassic and Early Cretaceous accretionary complexes (AC) of Japan.
Well dated by conodonts and radiolarians, the Triassic ocean type carbonate plateau, from where blocks, in the Mino-Tamba (Ashio), Mikabu and Chichibu belts, are derived, has a characteristic history of deposition related to seamount, hot-spot and plate-motion. The Izanami plateau is characterized by the changing nature of its substrate, from Paleozoic platform carbonates in more internal areas, to pillow basalts in more external zones, and by the younging of the base of the Triassic carbonates covering that substrate. In the more internal zones, depositional hiatuses relate to post - Aegean and Early Carnian emersions. Lower - Middle Norian condensation preceded the drowning of the platform in the more external zones, where Late Norian and Rhaetian strata consist of bedded chert only.
Faunistically, the realm of the Izanami plateau has more Tethyan than Pacific conodont affinities with some specific endemism.
The low latitude Izanami plateau extended over a large area, off the Yangtse block, prior to its inclusion in Jurassic to Early Cretaceous AC.
Journal Title
Eclogae Geologicae Helvetiae
ISSN
00129402
NCID
AA00631302
Volume
95
Issue
1
Start Page
43
End Page
55
Published Date
2002
Remark
ETH Zürich, www.e-periodica.ch
EDB ID
DOI (Published Version)
URL ( Publisher's Version )
FullText File
language
eng
TextVersion
Publisher
departments
Science and Technology