Isotopic structure and evolution of the continental crust in the East Transbaikalian segment of the Central Asian Foldbelt

Rytsk, E. Yu.; Ковач, В. П.; Yarmolyuk, V. V.; Коваленко, В. И.; Богомолов, Е. С.; Котов, А. Б.

doi:10.1134/s0016852111050037

Cited by 90 publications

(28 citation statements)

References 17 publications

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“…Other possible records of the circum‐Rodinia subduction‐accretion system include the ca. 1000–620 Ma Baikalian Fold Belt in southern Siberia [e.g., Rytsk et al ., ], the ca. 1300–780 Ma arc‐related (?)…”

Section: Discussionmentioning

confidence: 99%

“…This provides a new clue for the interpretation of the global tectonic setting of these regional events. Particularly, the broad comparability of the long‐lived accretionary orogen proposed here in the northern Tarim and the tectonothermal records in the southern Siberia [e.g., Rytsk et al ., ] and the Kokchetav‐North Tianshan belt [e.g., Kröner et al ., ] suggest that the early evolution of the CAOB probably initiated as part of the circum‐Rodinia subduction‐accretionary system and that the so‐called Paleo‐Asian Oceanic is not a “static” ocean intervening between Siberia, Baltic, Tarim, and North China but just a remnant of the Panthalassa‐like Mirovoi Ocean [ Ge et al ., ]. This provides an innovative and testable model for future studies of the CAOB.…”

Section: Discussionmentioning

confidence: 99%

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Mid-Neoproterozoic (ca. 830-800 Ma) metamorphicP-Tpaths link Tarim to the circum-Rodinia subduction-accretion system

Zhu

Wilde

2016

Tectonics

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Long‐lived exterior accretionary orogeny shapes tectonothermal evolution of the peripheral building blocks of supercontinents and leads to considerable crustal growth. However, such accretionary orogeny has only been locally recognized for the Rodinia supercontinent. Here a suite of newly discovered mid‐Neoproterozoic high‐grade metamorphic rocks in the northern Tarim Craton, NW China, are used to test the exterior accretion hypothesis for Rodinia. These rocks occur as dark‐colored mafic and calc‐silicate boudins in impure marbles and mica schists. Geochemical data suggest a protolith of arc‐related basalts metasomatized by Ca‐rich fluids. Mineral assemblages, phase diagram modeling, and mineral compositions for a garnet pyroxenite and a garnet clinopyroxene gneiss reveal upper amphibolite to high‐pressure granulite facies peak metamorphism (660–700°C, 11–12 kbar) following a counterclockwise P‐T path, which is characterized by prograde burial and heating, followed by near‐isothermal burial and retrograde exhumation and cooling. This P‐T path is interpreted to have recorded crustal thickening of an earlier magmatic arc transformed to a fore arc by subduction erosion and subsequent burial along bent isotherms near the subduction channel. All studied samples record ca. 830–800 Ma metamorphic zircon U‐Pb ages, which probably date the early exhumation and cooling according to Ti‐in‐zircon temperatures, zircon rare earth element patterns, and Hf isotopes. This is the first mid‐Neoproterozoic P‐T‐t path in Tarim, and it provides metamorphic evidence for a mid‐Neoproterozoic advancing‐type accretionary orogeny, which is coeval with the initial breakup events of Rodinia and thus links Tarim to the circum‐Rodinia accretion system, supporting the peripheral subduction model.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Mid-Neoproterozoic (ca. 830-800 Ma) metamorphicP-Tpaths link Tarim to the circum-Rodinia subduction-accretion system

Zhu

Wilde

2016

Tectonics

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“…These have been widely recognised in both the Mongolian (Badarch et al, 2002;Rojas-Agramonte et al, 2011;Kröner et al, 2014) and Russian (Buslov et al, 2002;Kozakov et al, 2007;Turkina et al, 2007;Rytsk et al, 2011) segments of the CAOB, so it is perhaps surprising that they appear to be generally lacking in China. Previous workers have suggested that the Erguna, Xing'an, Songliao, Jiamusi and Khanka blocks are themselves microcontinents (Wu et al, 2002).…”

Section: Introductionmentioning

confidence: 95%

The late Paleozoic to Mesozoic evolution of the eastern margin of the Central Asian Orogenic Belt in China

Wilde

Zhou

2015

Journal of Asian Earth Sciences

129

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“…Northeast China lies along the eastern edge of the Central Asian Orogenic Belt (CAOB) (Sengör, Natal'In, & Burtman, ; Windley, Alexeiev, Xiao, Kröner, & Badarch, ), which is an important area for researching the processes of Phanerozoic continental growth, accretionary orogenesis, and tectonic transformation (Figure a; Dobretsov, Buslov, & Yu, ; Kozakov et al, ; Rytsk et al, ). This region records the Phanerozoic amalgamation of micro‐continental fragments, namely, the Jiamusi–Khanka Block (JKB), Songnen Block (SB), Xing'an Block (XB), and Erguna Block (EB) (from southeast to northwest) (Figure b; Jahn, Windley, Natal'in, & Dobretsov, ; Wilde, Wu, & Zhang, ; Wilde, Zhang, & Wu, ).…”

Section: Introductionmentioning

confidence: 99%

Geochronology, petrogenesis, and tectonic setting of Late Triassic volcanic rocks of the Hadataolegai Formation, central Great Xing'an Range, Northeast China

et al. 2018

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In this study, new geochemical, zircon U–Pb, and Lu–Hf isotopic data are presented for volcanics from the Hadataolegai Formation of the central Great Xing'an Range (GXR) in Northeast China. These new data offer insights into the petrogenesis of the volcanics of the Hadataolegai Formation and the tectonic evolution of the Paleo–Asian Ocean (PAO) and Mongol–Okhotsk Ocean (MOO). These volcanics of the Hadataolegai Formation are divided into andesite‐trachyandesites and dacite‐trachydacites. Zircon U–Pb ages show that the volcanics of the Hadataolegai Formation erupted between 230 Ma and 228 Ma during the Late Triassic, which agrees with recently obtained data. The volcanic rocks in this study have low Y (9.9–21.1 ppm) and Yb (0.78–2.02 ppm) contents, high Sr (444–954 ppm) contents, and slight Eu anomalies (δEu = 0.82 to 0.94), similar to ‘adakite‐like’ rocks. The dacites were formed by fractional crystallization of coeval andesitic magmas. The zircons within the andesite and trachyandesite yield higher positive εHf(t) values (+6.3 to +12.0) and model ages (TDM2) between 860 Ma and 453 Ma, which indicates that the magmas were generated by a newly accreted continental crustal source. Moreover, some of the volcanics are relatively high in MgO contents. These characteristics indicate that the volcanic magmas were derived from the partial melting of delaminated lower crust and mixing with mantle materials. Combining these data with previous studies, we suggest that the magmatism in the central GXR was governed by extension due to the closure of the PAO and the back‐arc extension associated with the southward subduction of the MOO plate (western GXR, near the Erguna Block).

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Isotopic structure and evolution of the continental crust in the East Transbaikalian segment of the Central Asian Foldbelt

Cited by 90 publications

References 17 publications

Mid-Neoproterozoic (ca. 830-800 Ma) metamorphicP-Tpaths link Tarim to the circum-Rodinia subduction-accretion system

Mid-Neoproterozoic (ca. 830-800 Ma) metamorphicP-Tpaths link Tarim to the circum-Rodinia subduction-accretion system

The late Paleozoic to Mesozoic evolution of the eastern margin of the Central Asian Orogenic Belt in China

Geochronology, petrogenesis, and tectonic setting of Late Triassic volcanic rocks of the Hadataolegai Formation, central Great Xing'an Range, Northeast China

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