Cambrian/Ordovician boundary as a milestone in the sedimentation history of the southern Siberian craton: Evidence from U-Pb dating of detrital zircons

Гладкочуб, Д. П.; Motova, Z.L.; Donskaya, T. V.; Хубанов, В. Б.; Sizov, Alexander V.

doi:10.1016/j.jaesx.2022.100107

Cited by 6 publications

(1 citation statement)

References 31 publications

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“…The thrusting of Neoproterozoic ophiolites and deposition of arc-related sediments have been observed in many places along the southern margin of the Siberian Craton (Gladkochub et al, 2022(Gladkochub et al, , 2013Glorie et al, 2014;Khain et al, 2002;Powerman et al, 2015;Sklyarov, Lavrenchuk, Fedorovsky, Pushkarev, et al, 2020); these geological records were traditionally interpreted to reflect an early Paleozoic collision between the Siberian Craton and its peripheral continental fragments to the south (Zorin et al, 2009). Such a collision has been taken as a hallmark of an early event (namely the Baikal orogenic event), which shaped the initial evolution of the CAOB (Khain et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Metamorphic and chronological constraints on the early Paleozoic tectono‐thermal evolution of the Olkhon Terrane, southern Siberia

Jiang

Collett

et al. 2023

Journal Metamorphic Geology

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Terranes accreted to the southeastern margin of the Siberian Craton record an important early Paleozoic tectono-thermal event (known as the Baikal orogenic cycle) in the evolution of the Central Asian Orogenic Belt (CAOB). However, the precise metamorphic conditions and relative timing of this event and its linkage to the wider CAOB remain far poorly constrained. The best exposed of these terranes is the Olkhon Terrane on the western bank of Lake Baikal.Here, late Neoproterozoic through early Paleozoic island arc and back-arc assemblages were metamorphosed to form a thin granulite facies belt cropping out adjacent to the Siberian Craton and lower temperature/pressure paragneiss and migmatite towards the southeast. Phase equilibria modelling suggests that the granulite facies belt preserved moderate pressure (c. 0.80 GPa) and high temperature (up to 900 C) conditions while the paragneiss and migmatites in the southeast have peak metamorphic conditions around 700-770 C at 0.60-0.80 GPa. New geochronological data (zircon U-Pb in granulite and monazite U-Pb in paragneiss/migmatite) in combination with phase equilibria modelling and petro-structural analysis suggest that the tectono-metamorphic evolution of the Olkhon Terrane was controlled by a long-lasting (535-450 Ma) and pervasive thermal anomaly. Discrete maxima in the zircon and monazite U-Pb ages at c. 535, 500, and 450 Ma are linked to different stages of a semi-continuous high-temperature metamorphic evolution. Based on existing geological data of the region, a generalized geodynamic model for the Baikal orogenic cycle involving switching between compressional and extensional regimes during the early Paleozoic accretion of 'exotic' CAOB-derived material to the southern margin of Siberia is proposed. The tectono-metamorphic evolution of the Olkhon Terrane may represent a worldclass example of polyphase shortening of a long-lived hot intra-continental arc-back-arc system during its collision with cratonic blocks.

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Section: Introductionmentioning

confidence: 99%

Metamorphic and chronological constraints on the early Paleozoic tectono‐thermal evolution of the Olkhon Terrane, southern Siberia

Jiang

Collett

et al. 2023

Journal Metamorphic Geology

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The First Detrital Zircon Data on the Northwestern Precambrian Yenisei Ridge: Identification of the Continental–Arc Kiselikha Terrane

Kuzmichev,

Storozhenko,

Danukalova

et al. 2023

Stratigr. Geol. Correl.

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Kimiltei Is a New Late Cambrian Lagerstätte with the Faunistic Complex of Arthropods (Euthycarcinoidae, Synziphosurina, and Chasmataspidida) in the Irkutsk Region

2023

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A new locality Kimiltei, Irkutsk oblast, where unmineralized remains of arthropods were buried en masse, is described. The U–Pb zircon dating yielded a Cambrian age with the youngest values of 492 ± 4 Ma. Kimiltei arthropods are represented by Chasmataspidida, Synziphosurina, and Euthycarcinoidea. The last two groups have not been known in the Siberian Platform, and the first one has been described in this area only from Devonian rocks. The Irkutsk findings are the most ancient representatives of their groups, and their distribution areas turn out to be wider than previously known. Their co-burial is noteworthy, because the representatives of these groups have never been found together before. Taking into account the fact that the descendants of all three groups gave rise to the terrestrial lines of chelicerates and insects, the Kimiltei assemblage is the entire fauna of the land arthropod ancestors. Their cohabitation is indicative of the fact that they started their expansion on land from some close ecological niches in the intertidal zone.

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Cambrian/Ordovician boundary as a milestone in the sedimentation history of the southern Siberian craton: Evidence from U-Pb dating of detrital zircons

Cited by 6 publications

References 31 publications

Metamorphic and chronological constraints on the early Paleozoic tectono‐thermal evolution of the Olkhon Terrane, southern Siberia

Metamorphic and chronological constraints on the early Paleozoic tectono‐thermal evolution of the Olkhon Terrane, southern Siberia

The First Detrital Zircon Data on the Northwestern Precambrian Yenisei Ridge: Identification of the Continental–Arc Kiselikha Terrane

Kimiltei Is a New Late Cambrian Lagerstätte with the Faunistic Complex of Arthropods (Euthycarcinoidae, Synziphosurina, and Chasmataspidida) in the Irkutsk Region

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