Stephan Mueller Special Publication Series www.stephan-mueller-spec-publ-ser.net 1868-4556 1868-4564 4 Geology, geophysics and tectonics of Northeastern Russia: a tribute to Leonid Parfenov 2009 10.5194/smsps-4-71-2009 http://www.stephan-mueller-spec-publ-ser.net/4/71/2009/ http://www.stephan-mueller-spec-publ-ser.net/4/71/2009/smsps-4-71-2009.html http://www.stephan-mueller-spec-publ-ser.net/4/71/2009/smsps-4-71-2009.pdf 71 84 2009-09-17 Middle Paleozoic-Mesozoic boundary of the North Asian craton and the Okhotsk terrane: new geochemical and geochronological data and their geodynamic interpretation A. V. Prokopiev J. Toro jtoro@wvu.edu J. K. Hourigan A. G. Bakharev E. L. Miller Diamond and Precious Metal Geology Institute, Siberian Branch, Russian Academy of Sciences, Yakutsk 677980, Russia Department of Geology and Geography, West Virginia University, Morgantown, WV 26506, USA Department of Earth Sciences, University of California, Santa Cruz, CA 95064, USA Department of Geological and Environmental Sciences, Stanford University, Stanford, CA 94305, USA The Okhotsk terrane, located east of the South Verkhoyansk sector of the Verkhoyansk fold-and-thrust belt, has Archean crystalline basement and Riphean to Early Paleozoic sedimentary cover similar to that of the adjacent the North Asian craton. However, 2.6 Ga biotite orthogneisses of the Upper Maya uplift of the Okhotsk terrane yielded Early Devonian ⁴⁰Ar/³⁹Ar cooling ages, evidence of a Mid-Paleozoic metamorphic event not previously known. These gneisses are also intruded by 375&plusmn;2 Ma (Late Devonian) calc-alkaline granodiorite plutons that we interpret as part of a continental margin volcanic arc. Therefore, Late Devonian rifting, which affected the entire eastern margin of North Asia separating the Okhotsk terrane from the North Asian craton, was probably a back-arc event. <br><br> Our limited ⁴⁰Ar/³⁹Ar data from the South Verkhoyansk metamorphic belt suggests that low grade metamorphism and deformation started in the Late Jurassic due to accretion of the Okhotsk terrane to the North Asia margin along the Bilyakchan fault. Shortening and ductile strain continued in the core of the South Verkhoyansk metamorphic belt until about 120 Ma due to paleo-Pacific subduction along the Uda-Murgal continental margin arc. Andriyanov, N. 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