Инд. авторы:	Likhanov I.I., Regnier J.L., Santosh M.
Заглавие:	Blueschist facies fault tectonites from the western margin of the Siberian Craton: Implications for subduction and exhumation associated with early stages of the Paleo-Asian Ocean
Библ. ссылка:	Likhanov I.I., Regnier J.L., Santosh M. Blueschist facies fault tectonites from the western margin of the Siberian Craton: Implications for subduction and exhumation associated with early stages of the Paleo-Asian Ocean // Lithos. - 2018. - Vol.304. - P.468-488. - ISSN 0024-4937. - EISSN 1872-6143.
Идентиф-ры:	DOI: 10.1016/j.lithos.2018.02.021; РИНЦ: 35069319; SCOPUS: 2-s2.0-85042746931; WoS: 000430029800028;
Реферат:	eng: The tectonic evolution of the Siberian Cratonic margins offers important clues for global paleogeographic reconstructions, particularly with regard to the complex geological history of Central Asia. The Yenisey Ridge fold-and-thrust belt at the western margin of the Siberian Craton forms part of the Central Asian Orogenic Belt (CAOB) and is a key to understand the Precambrian tectonic evolution of the Siberian Craton and crustal growth in the CAOB, the world's largest Phanerozoic accretionary orogenic belt. Here we report for the first time, the occurrence of glaucophane schist relics in tectonites within the Yenisey shear zone which provides insights on Chilean-type convergent boundary. We present results from isotope geochronology (SHRIMP zircon analysis and mica Ar-40/Ar-39 dating), coupled with P-T calculations derived from conventional geothermobarometry and pseudosections in the system NCKFMASH that suggest two superimposed metamorphic events. During the first stage, glaucophane schists formed at around 640-620 Ma at P-T conditions of 8-10 kbar and 400-450 degrees C. In the second stage, the rocks experienced dynamic metamorphism (c. 600 Ma) at 11-15 kbar/550-640 degrees C. The differences in P-T parameters between weakly deformed rocks and intensely deformed tectonites and P-T paths suggest distinct tectonic processes. Geochemical features of the mafic tectonites suggest N-MORB and E-MORB affinity, and the zircon U-Pb ages suggest formation of the protoliths at 701.6 +/- 8.4. The sequence of spreading, subduction and shear deformation identified in our study correlate with the early stages of development of the Paleo-Asian Ocean at the western margin of the Siberian Craton and supports the spatial proximity of Siberia and Laurentia at 700-600 Ma, as proposed for the Late Neoproterozoic paleogeographic reconstructions and as robustly constrained from large igneous province (LIP) record. (C) 2018 Elsevier B.V. All rights reserved.
Ключевые слова:	EMPIRICAL CALIBRATION; BARROVIAN METAMORPHISM; TRANSANGARIAN REGION; COLLISIONAL METAMORPHISM; FE-RICH; P-T PATHS; ULTRA-HIGH PRESSURE; AL-RICH METAPELITES; Siberian Craton; Paleo-Asian Ocean; Ar-40/Ar-39 ages; Zircon U-Pb SHRIMP geochronology; Pseudosections; Geothermobarometry; SOUTH YENISEI RIDGE; PRECAMBRIAN COMPLEXES;
Издано:	2018
Физ. хар-ка:	с.468-488
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