Phanerozoic tectonic evolution of the circum-north Pacific: by W. J. Nokleberg, J. W. Parfenov, et al.

By W. J. Nokleberg, J. W. Parfenov, et al.

The us Geological Survey (USGS) is a systematic association created in 1879, and is a part of the U.S. govt. Their scientists discover the environment and ecosystems, to figure out the usual risks we face. The service provider has over 10,000 staff that acquire, computer screen, and learn info in order that they have a greater figuring out of our difficulties. The USGS is devoted to supply trustworthy, investigated info to augment and defend our caliber of existence. this is often one in every of their stories.

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Extra resources for Phanerozoic tectonic evolution of the circum-north Pacific: USGS Open-File Report 98-754

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The Khabarovsk terrane (KB) (younger, Cretaceous part; too small to show in figs. 1, 3) consists of a melange with various-size fault-bounded lenses and slices of Triassic chert, Early to Middle Jurassic siliceous shale, hemipelagic sedimentary rocks, mafic volcanic rocks, and gabbro, Late Carboniferous, Permian, and Late Triassic limestone, and schist and metasandstone of unknown age (Shevelev, 1987; Natal’in and Alekseenko, 1989; Natal’in and Zyabrev, 1989). The late Paleozoic limestone, which locally contains volcanic-rock layers and a Tethyan fauna, is interpreted as reef caps on seamounts.

This tectonic pairing is based mainly on the occurrence of the South Anyui terrane outboard of, and parallel to, the newly formed continental margin of Northeast Asia and parallel to the Oloy and Svyatov Nos volcanic belts (fig. 3). Subduction is generally interpreted as occurring during the Late Jurassic and Early Cretaceous, when the arcs were active (Parfenov, 1984, 1991, 1995b; Parfenov and others, 1993a, b). Late Paleozoic to Early Jurassic Alazeya Arc in the Russian Northeast Remnants of the mainly Late Triassic and Early Jurassic and possibly middle and late Paleozoic Alazeya island arc are preserved in the Alazeya (AL) and Khetachan (KH) island-arc terranes (fig.

The South Anyui subduction-zone terrane (Natal’in, 1984; Savostin and Drachev, 1988a, b; Dudko and Spektor, 1989; Lychagin and others, Phanerozoic Tectonic Evolution of the Circum-North Pacific 1991; Drachev and Savostin, 1992) consists of thrust slices of (1) tectonic sheets of serpentinized peridotite and Permian to Triassic turbidite deposits; (2) highly deformed, Carboniferous (in part) midoceanic-ridge-type pillow lavas; (3) interlayered midoceanic-ridge-type pillow basalt and Middle and Late Jurassic graywacke, slate, and chert; and (4) local glaucophane schist and Berriasian through Hauterivian turbidites.

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