Abstract
The paper presents the results of U-Pb and Lu-Hf isotope studies of detrital zircons from the terrigenous the Lan 410 Ma (Lower Devonian), Terrane in the eastern part of the Mongol-Okhotsk fold belt. The lower age rocks limits are for the Nivakh formation ~ for the Verkholan series ~332 Ma (Mississippian), for the Ugokhan series ~239 Ma (Middle Triassic). The evidences were obtained for the Lower Triassic (or Middle-Late Triassic) age of the sediments assigned to the Ugokhan series previously classified as Upper Paleozoic. These data indicate that the Lower Mesozoic sedimentary complexes in the structure of this belt are developed much wider than is currently believed. The main sources of clastic material for the Devonian, Carboniferous, and Triassic sedimentary rocks of the Lan terrane were mainly igneous and metamorphic complexes of the North Asian craton framing, along with island arcs. The Lan Terrane can be considered as a fragment of the accretionary complex formed in front of the southeastern margin of the North Asian craton.
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