Fragments of the early Paleozoic orogenic belt from Tokyo Metropolis, Japan:

Ordovician Japan formed a mature arc-trench system developed along the Paleo-Pacific (Panthalassa) margin of the Greater South China (GSC) continental block. GSC consists of South China, East China Sea, SW-NE Japan, and Khanka-Jiamusi-Bureya megablock in the Far East; thus in total twice as large as the South China components by itself (Yangtze and Cathaysia). The Ordovician crust of Proto-Japan comprised coeval arc-related rocks, such as granitoids, supra-subduction zone ophiolite, and fore-arc basin strata, although most of them were considerably fragmented. The Ordovician and middle-late Paleozoic fossils from Japan are highly limited but suggest that Proto-Japan was positioned in the low-latitude domains probably of the Paleo-Pacific Ocean in connection to Paleo-Tethys. GSC became separated from Rodinia in the Neoproterozoic, and its Proto-Japan segment evolved as a collision-free subduction margin for nearly 500 Myr since the mid-Cambrian. The GSC framework provides critical constraints to paleogeographical reconstruction of circum-Pacific continental blocks. First, the Cambro-Ordovician GSC should have been isolated from Australia/India/East Antarctica of East Gondwana, by a relatively wide ocean domain for keeping “subduction potential”. Second, the Cathaysian margin of GSC should have faced to an extensive ocean without major continents since the Cambrian. The Paleo-Pacific is the only possible candidate for this.

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Fragments of the early Paleozoic orogenic belt from Tokyo Metropolis, Japan:

Cited by 6 publications

References 33 publications

Tectonic evolution of the Early Paleozoic proto-East Asian continental margin: Inference from Paleozoic metamorphic rocks in the South Kitakami belt, northeast Japan

Tectonic evolution of the Early Paleozoic proto-East Asian continental margin: Inference from Paleozoic metamorphic rocks in the South Kitakami belt, northeast Japan

Tectonic evolution of Southwest Japan at the Cretaceous time inferred from the zircon U–Pb geochronology along the Maana Belt, western Shikoku, Japan

Ordovician Japan: geotectonic setting and palaeogeography

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