Dmitry L. Konopelko

St Petersburg University

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Reimar Seltmann

Natural History Museum

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С. А. Сергеев

A.P. Karpinsky Russian Geological Research Institute

Reiner Klemd

Friedrich-Alexander-Universität Erlangen-Nürnberg

Rustam Mirkamalov

Interstate Commission for Water Coordination of Central Asia

Farid Divaev

Interstate Commission for Water Coordination of Central Asia

Stijn Glorie

University of Adelaide

Yu. S. Biske

St Petersburg University

Olav Eklund

Åbo Akademi University

Georgy Biske

St Petersburg University

Gilby Jepson

University of Arizona

Cooperative Institutions

Russian Academy of Sciences

St Petersburg University

A.P. Karpinsky Russian Geological Research Institute

Geological Institute

Institute of Precambrian Geology and Geochronology

University of Adelaide

Novosibirsk State University

Siberian Branch of the Russian Academy of Sciences

Institute of the Earth’s Crust

Curtin University

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The low-temperature thermo-tectonic evolution of the western Tian Shan, Uzbekistan

Gondwana Research (2018)

Gilby Jepson Stijn Glorie Dmitry L. Konopelko Rustam Mirkamalov Martin Danišík

Paleogene

Thermochronology

Fission track dating

Basement

10.1016/j.gr.2018.08.003

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Citations (31)

Precambrian gold mineralization at Djamgyr in the Kyrgyz Tien Shan: Tectonic and metallogenic implications

Ore Geology Reviews (2017)

Dmitry L. Konopelko Reiner Klemd С. В. Петров F. Apayarov B. Nazaraliev

Metallogeny

Mesothermal

Basement

10.1016/j.oregeorev.2017.03.007

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Citations (18)

Subduction and exhumation mechanisms of ultra‐high and high‐pressure oceanic and continental crust at Makbal (Tianshan, Kazakhstan and Kyrgyzstan)

Journal of Metamorphic Geology (2014)

Melanie Meyer Reiner Klemd E. Hegner Dmitry L. Konopelko

Abstract The Makbal Complex in the northern Tianshan of Kazakhstan and Kyrgyzstan consists of metasedimentary rocks, which host high‐ P ( HP ) mafic blocks and ultra‐HP Grt‐Cld‐Tlc schists ( UHP as indicated by coesite relicts in garnet). Whole rock major and trace element signatures of the Grt‐Cld‐Tlc schist suggest a metasomatized protolith from either hydrothermally altered oceanic crust in a back‐arc basin or arc‐related volcaniclastics. Peak metamorphic conditions of the Grt‐Cld‐Tlc schist reached ~580 °C and 2.85 GPa corresponding to a maximum burial depth of ~95 km. A Sm‐Nd garnet age of 475 ± 4 Ma is interpreted as an average growth age of garnet during prograde‐to‐peak metamorphism; the low initial εΝd value of −11 indicates a protolith with an ancient crustal component. The petrological evidence for deep subduction of oceanic crust poses questions with respect to an effective exhumation mechanism. Field relationships and the metamorphic evolution of other HP mafic oceanic rocks embedded in continentally derived metasedimentary rocks at the central Makbal Complex suggest that fragments of oceanic crust and clastic sedimentary rocks were exhumed from different depths in a subduction channel during ongoing subduction and are now exposed as a tectonic mélange. Furthermore, channel flow cannot only explain a tectonic mélange consisting of various rock types with different subduction histories as present at the central Makbal Complex, but also the presence of a structural ‘dome’ with UHP rocks in the core (central Makbal) surrounded by lower pressure nappes (including mafic dykes in continental crust) and voluminous metasedimentary rocks, mainly derived from the accretionary wedge.

Protolith

Metamorphic core complex

10.1111/jmg.12097

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Citations (33)

Possible source dichotomy of contemporaneous post-collisional barren I-type versus tin-bearing A-type granites, lying on opposite sides of the South Tien Shan suture

Ore Geology Reviews (2009)

Dmitry L. Konopelko Reimar Seltmann Georgy Biske E. N. Lepekhina С. А. Сергеев

Geochronology

Collision zone

10.1016/j.oregeorev.2009.01.002

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Citations (93)

Hercynian post-collisional magmatism in the context of Paleozoic magmatic evolution of the Tien Shan orogenic belt

Journal of Asian Earth Sciences (2010)

Reimar Seltmann Dmitry L. Konopelko Georgy Biske Farid Divaev С. А. Сергеев

Batholith

10.1016/j.jseaes.2010.08.016

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Citations (279)

Nd isotope variation across the Archaean-Proterozoic boundary in the North Ladoga Area, Russian Karelia

GFF (2005)

Dmitry L. Konopelko В. М. Саватенков Viktor Glebovitsky Alexander Kotov С. А. Сергеев

Abstract In order to investigate the boundary between Archaean crust of the Karelian Craton and Paleoproterozoic crust of the Svecofennian Orogen in the area north and west of the lake Ladoga (the North Ladoga Area) 24 samples of mostly granitoid rocks, collected along the 100 km long profile across the inferred suture, were analysed for their Nd isotopic composition. Ten previously published Nd data were incorporated in the dataset. It was established that gneisses from so-called "mantled domes" north of the suture have very low ∊Nd values and represent reworked Archaean basement. North of the Kirjavalahti Dome, the presence of Archaean basement under Kalevian sedimentary cover is registered by abundant Archaean cores in zircons, revealed by a SHRIMP study, and by low ∊Nd values in the rocks of the 1874±13 Ma-old Alattu dyke complex. The transition from Archaean to Proterozoic crust is registered by a shift from very low to Bulk-Earth-type ∊Nd values and occurs within a 10-20 km-wide zone north of the inferred suture. The rocks of the Svecofennian Orogen south of the suture are characterized by relatively uniform initial Nd isotopic composition (average ∊Nd value at 1880-1860 Ma +0.7, n = 17). In terms of Nd isotopic composition, this domain, the Lahdenpohja Domain, is comparable to the Svecofennian terranes to the west: the Central Finland Granitoid Complex and the Accretionary Arc Complex of Southern Finland. The Primitive Arc Complex of Central Finland has, in contrast, significantly more juvenile Nd isotopic composition.

Accretionary wedge

Basement

10.1080/11035890501272115

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Citations (10)

A geotraverse across two paleo-subduction zones in Tien Shan, Tajikistan

Gondwana Research (2016)

Dmitry L. Konopelko Reimar Seltmann Yunus Mamadjanov Rolf L. Romer Yamirka Rojas‐Agramonte

Batholith

Devonian

Back-arc basin

10.1016/j.gr.2016.09.010

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Citations (61)

Timing and geochemistry of potassic magmatism in the eastern part of the Svecofennian domain, NW Ladoga Lake Region, Russian Karelia

EGS - AGU - EUG Joint Assembly (2003)

Dmitry L. Konopelko Olav Eklund

The Puutsaari intrusion is a potassium-rich magmatic complex in the eastern part of the Svecofennian domain close to the Archaean border. The intrusion is generally undeformed in contrast to 1880 /1875 Ma-old country rock tonalitic migmatites and diatectites. The main rock types are: (1) mafic rocks of a gabbro /norite /diorite /quartz monzodiorite series; (2) quartz diorite /tonalite /granodiorite; and (3) coarse-grained microcline granite. The three rock-types intruded coevally forming a peculiar three-component mingling system. The mafic rocks, enriched in K, P, Ba, Sr and LREE, have marked shoshonitic affinities (K2O /1.97 /5.40, K2O/Na2O /0.6 /2.37). On a regional scale they demonstrate transitional geochemistry between less enriched syn-orogenic 1880 Ma-old gabbro /tonalite complexes and strongly enriched 1800 Ma post-collisional shoshonitic intrusions. The microcline granite as well as the tonalite / granodiorite rocks are geochemically similar to crustal anatectic granitoids of the NW Ladoga Lake area. The three rock groups do not form a single trend on Harker-type diagrams and are unlikely to be related by fractional crystallisation or mixing. Zircons from the Puutsaari microcline granite and from the mafic rock series have been dated by ion-microprobe (NORDSIM) at 1868.29/5.9 and 18699/7.7 Ma, respectively. Most zircons recovered from a granite sample had zoned or homogeneous cores and unzoned fractured rims. No statistically significant variation of zircon core and rim ages from the granite was established in the course of this study. Zircons from the mafic rock are unzoned. It is suggested that the mafic rocks at Puutsaari were derived from an enriched mantle shortly after the main Svecofennian collisional event and the roughly 1.88 Ga regional metamorphic culmination. The emplacement of the mafic melt caused anatectic melting of various crustal protoliths and produced coeval granitic and tonalitic compositions. # 2002 Elsevier Science B.V. All rights reserved.

Diorite

Quartz monzonite

Titanite

Microcline

Source

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The U-Pb geochronology of the Mukhal alkaline massif (western Transbaikalia)

Russian Geology and Geophysics (2012)

А. G. Doroshkevich G. S. Ripp С. А. Сергеев Dmitry L. Konopelko

Massif

Geochronology