The Russian-Kazakh Altai orogen: An overview and main debatable issues

Safonova, Inna

doi:10.1016/j.gsf.2013.12.003

Cited by 57 publications

(32 citation statements)

References 55 publications

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“…The Chinese Altay and East Junggar Terranes are located between the south Siberian Sayan block to the north and Junggar Basin to the south in the northern Xinjiang Autonomous Region of China (Figure 1; Long et al, 2012;Safonova & Santosh, 2014;Xiao et al, 2014). From north to south, these two blocks are tectonically divided into the Altay, Dulate, and Yemaquan arcs, which are further separated by the Ertix and Zhaheba-Armantai fault zones (Long et al, 2012;Xiao et al, 2008Xiao et al, , 20092014; Figure 1b).…”

Section: Geological Settingmentioning

confidence: 99%

Zircon U–Pb geochronology and geochemistry of Devonian plagiogranites in the Kuerti area of southern Chinese Altay, northwest China: Petrogenesis and tectonic evolution of late Paleozoic ophiolites

et al. 2017

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This study presents zircon U–Pb geochronology with major, trace, rare earth element and Sr–Nd isotope geochemistry for plagiogranite dyke swarms occurring within the gabbro unit of the lower part of the Kuerti ophiolite in southern Chinese Altay, Northwest China. These intrusive plagiogranites cut across the metamorphic zone consisting of amphibolites that are related to hydrothermal alteration and shearing of gabbros. LA‐ICP‐MS zircon U–Pb dating of 2 plagiogranite samples yields approximately 390 Ma age of origin. They are geochemically characterized by relatively high SiO2 and Na2O, low K2O, TiO2, and Al2O3 contents, with marked enrichment in light rare earth elements and depletion in Nb, Ta, and Ti. They have slightly higher initial 87Sr/86Sr ratios (0.7040 to 0.7049), lower εNd(t) values (+3.6 to +6.3), and higher Th contents (2.84–11.9 ppm) than those (0.7034 to 0.7048, +7.2 to +10.3, and 0.04 to 1.79) of closely associated amphibolites. Geological and geochemical attributes suggest that the plagiogranites were generated by the anatexis of hydrated and hydrothermally altered amphibolites and minor sediments from oceanic crust during shearing at low pressure (<0.1 GPa) and temperature (<850 °C) conditions in a suprasubduction zone setting. The ridge subduction at approximately 390 Ma caused the upwelling of the hot asthenosphere and triggered the spreading of the Kuerti back‐arc basin, followed by the formation of the plagiogranites in the Kuerti ophiolite.

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Section: Geological Settingmentioning

confidence: 99%

Zircon U–Pb geochronology and geochemistry of Devonian plagiogranites in the Kuerti area of southern Chinese Altay, northwest China: Petrogenesis and tectonic evolution of late Paleozoic ophiolites

et al. 2017

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“…The Southern Altai Domain is the southernmost tectonic unit of the Chinese Altai, and is represented by schist, para-/ortho-gneiss, amphibolite, migmatite and metaschert of the Irtysh Complex (Qu and Zhang, 1991;Briggs et al, 2007;Li et al, 2015a). The origin of these rocks is considered to be an accretionary complex (O'Hara et al, 1997;Xiao et al, 2009), which can be traced into NE Kazakhstan, termed as the Irtysh-Zaisan Complex (Windley et al, 2007) or the Kalba-Narym terrane (Buslov et al, 2004a;Safonova, 2013).…”

Section: It Mainly Includes Late Devonian To Early Carboniferous Metamentioning

confidence: 99%

“…The exact age of this collision is not well constrained. A number of authors have suggested, based on the occurrence of collision-related magmatic rocks, that the collision initiated in the Late Carboniferous or the latest Early Carboniferous (Buslov et al, 2004a;Glorie et al, 2012;Safonova, 2013;Kuibida et al, 2016). However, some ophiolitic rocks along the collisional zone may be as young as the early Permian, which seems to support a Permian collision (e.g.…”

Section: Structural Interpretation and Strain Partitioningmentioning

confidence: 99%

Transpressional deformation, strain partitioning and fold superimposition in the southern Chinese Altai, Central Asian Orogenic Belt

Sun

Rosenbaum

et al. 2016

Journal of Structural Geology

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Transpressional deformation has played an important role in the late Paleozoic evolution of the western Central Asian Orogenic Belt (CAOB), and understanding the structural evolution of such transpressional zones is crucial for tectonic reconstructions. Here we focus on the transpressional Irtysh Shear Zone with an aim at understanding amalgamation processes between the Chinese Altai and the West/East Junggar. We mapped macroscopic fold structures in the southern Chinese Altai and analyzed their relationships with the development of the adjacent Irtysh Shear Zone. Structural observations from these macroscopic folds show evidence for four generations of folding and associated fabrics. The earlier fabric (S 1), is locally recognized in low strain areas, and is commonly isoclinally folded by F 2 folds that have an axial plane orientation parallel to the dominant fabric (S 2). S 2 is associated with a shallowly plunging stretching lineation (L 2), and defines ~NW-SE tight-close upright macroscopic folds (F 3) with the doubly plunging geometry. F 3 folds are superimposed by ~NNW-SSE gentle F 4 folds. The F 3 and F 4 folds are kinematically compatible with sinistral transpressional deformation along the Irtysh Shear Zone and may represent strain partitioning during deformation. The sub-parallelism of F 3 fold axis with the Irtysh Shear Zone may have resulted from strain partitioning associated with simple shear deformation along narrow mylonite zones and pure shear-dominant deformation (F 3) in fold zones. The strain partitioning may have become less efficient in the later stage of transpressional deformation, so that a fraction of transcurrent components was partitioned into F 4 folds.

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“…The accretionary complexes of Central Asia host OPS units/terranes formed during four major age intervals: late Neoproterozoicearly Paleozoic (Russian-Kazakh-Chinese-Mongolian Altai, East and West Sayan, Transbaikalia), Middle Paleozoic-early Carboniferous (Kazakh-Kyrgyz-Uzbek-Tajik Tienshan, East Kazakhstan, Mongolia); late Carboniferous-Permian (Russian Far East: Sikhote-Alin), Triassic-Neogene (Russian Far East: Sikhote-Alin, Sakhalin, and Kamchatka) (e.g., Buslov et al, 2001;Windley et al, 2007;Sun et al, 2008;Safonova et al, 2011Safonova et al, , 2016aSafonova, 2014;Safonova and Santosh, 2014;Yarmolyuk et al, 2014;Simonov et al, 2015;Alexeiev et al, 2016). The structure and age of OPS units of each age group can be used (1) to identify and classify OPS units (pelagic-hemipelagic-trench-seamount); (2) to reconstruct the size and age of each oceanic plate by the depth of decollement (i.e., by recognizing one of 4 types of OPS: ss, css, bcss, gbcss 1) (Safonova et al, 2016b), 3to estimate the number and length of subduction zones, (4) to estimate the rate of sedimentation, (5) to determine the direction of subduction, (6) to highlight the periods of maximal accretion of oceanic crust (for thickest accretionary complexes) and maximal subduction and tectonic erosion.…”

Section: P-type Belts Of Central Asiamentioning

confidence: 99%

Pacific-type orogenic belts: linking evolution of oceans, active margins and intra-plate magmatism

Safonova¹,

Maruyama²,

Крук³

et al. 2018

Episodes

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Pacific-type orogens (fold belts) hosting accretionary complexes are places keeping records of the evolution of paleo-oceans, and formation and transformation of continental crust at their active convergent margins. Pacific-type orogeny induces destruction of crustal materials, their subduction to the deep mantle, generation of hydrouscarbonated plumes in the mantle transition zone (MTZ) and its related intra-plate magmatism. We propose a new approach for linking paleo-oceans, active margins and intra-plate magmatism in central and eastern Asia. The approach "stands" on three "whales": the model of Ocean Plate Stratigraphy (OPS), the parameters of Pacific-type convergent margins and a model of hydrous-carbonated plumes. The OPS model evolved from extensive studies of accretionary complexes in the western Pacific, in particular, in Japan; it allows differentiating oceanic plates of one paleoocean and evaluating their sizes and ages. An important issue for reconstructing the history of paleo-oceans is to estimate major parameters of the Pacific-type convergent margins: accreting vs. eroding, geometrical length, and life time. For the eroding margins we must define major periods of tectonic erosion and transportation of oceanic and continental materials to the deep mantle and evaluate a possibility of their accumulation in the MTZ. All this would allow us to develop a holistic model linking the evolution of paleooceans, the accretion and erosion of oceanic and continental crust materials at Pacific-type convergent margins, mantle metasomatism and intra-plate magmatism.

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The Russian-Kazakh Altai orogen: An overview and main debatable issues

Cited by 57 publications

References 55 publications

Zircon U–Pb geochronology and geochemistry of Devonian plagiogranites in the Kuerti area of southern Chinese Altay, northwest China: Petrogenesis and tectonic evolution of late Paleozoic ophiolites

Zircon U–Pb geochronology and geochemistry of Devonian plagiogranites in the Kuerti area of southern Chinese Altay, northwest China: Petrogenesis and tectonic evolution of late Paleozoic ophiolites

Transpressional deformation, strain partitioning and fold superimposition in the southern Chinese Altai, Central Asian Orogenic Belt

Pacific-type orogenic belts: linking evolution of oceans, active margins and intra-plate magmatism

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