The first data on syn-accretionary medium-pressure metamorphism on the western margin of the Siberian Craton (Yenisei Ridge)
DOI:
https://doi.org/10.17308/geology.2020.1/2516Keywords:
metamorphism geothermobarometry, in situ U-Th-Pb monazite geochronology, Garevka complex, Siberian CratonAbstract
Introduction. 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 Yenisei Ridge, an ancient fold-and-thrust orogenic on 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. Accretionary–collisional processes during the Neoproterozoic history of this region are genetically and spatially associated with the formation of the Paleo-Asian Ocean (PAO). The questions of how Yenisei Ridge terranes are related to the PAO evolution and their subsequent accretion to the Siberian Craton are in many aspects still far from being answered, which raises interest in the features of the development of accretionary–subduction structures in paleoocean–continent transitional zones. The article discusses the genetic relationship of tectonics and metamorphism with accretion-collision processes at the convergent plate boundary at the western margin of the Siberian Craton. Methodology. The petrological, geochemical and geochronological studies of the garnet-staurolite-kyanite blastomylonites of the Garevka metamorphic complex of the Yenisei Ridge were performed. Results and discussion. At an early stage (630–610 Ma), metamorphic complexes were formed with a composition close to those of paired metamorphic belts. These complexes were characterized by a conjugate manifestation of the blueschist facies HP/LT metamorphism at 8–10 kbar/400–450oС and the zonal low-pressure LP/HT metamorphism of the andalusite-sillimanite (low-pressure) type at 3.4–3.6 kbar/435-450oС. During the subsequent (610–590 Ma) accretion–collision deformation processes, the latter rocks underwent dynamic metamorphism at 6.3–6.6 kbar/570–600 oС with the formation of high- pressure tectonites in the suture zone. Conclusion. The polycyclic development of the processes of formation of these rocks at the convergent boundary of "paleocontinent-paleocean" in the time interval of 630-590 Ma was established.
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