Papers by Alexander Larionov
Proceedings of the Karelian Research Centre of the Russian Academy of Sciences
Proceedings of the Karelian Research Centre of the Russian Academy of Sciences
Magnetostratigraphic Constraints on the Position of the Tremadocian–Floian Boundary at the Key Section of the Moyero River Valley (Siberian Platform)
Springer Proceedings in Earth and Environmental Sciences, 2022
Late Riphean Alkaline Magmatism in the Western Framework of the Siberian Craton: A Result of Continental Rifting or Accretionary Events?
Doklady Earth Sciences
Age, mineral geochemistry, and conditions of the formation of the Shueretskoe garnet deposit (Belomorian Belt)
Doklady Earth Sciences, 2009
Achaean TTG and high alimunia gneisses on Baltic Shield: Precise U-Pb (ID-TIMS) and SHRIMP-II ages on single zircon
EGUGA, May 1, 2014
Geological Magazine, 2021
A detailed geochronological study was conducted on zircons from a diorite sample of the Posets pl... more A detailed geochronological study was conducted on zircons from a diorite sample of the Posets pluton (Axial Zone, Pyrenees). The extracted igneous zircons constrain the emplacement of the pluton to 302 ± 2 Ma and 301 ± 3 Ma, by means of U–Pb sensitive high-resolution ion microprobe (SHRIMP) and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) analyses, respectively. Considering the syn- to late-tectonic emplacement of the Posets pluton during the main Variscan deformation event (D2), the obtained ages constrain the long-lasting D2, associated with the dextral transpression registered through the Axial Zone of the Pyrenees.
Se ha determinado la presencia de circones ígneos y metamórficos en muestras procedentes del plut... more Se ha determinado la presencia de circones ígneos y metamórficos en muestras procedentes del plutón de Lys-Caillaouas mediante el análisis petrográfico y geoquímico. Los circones ígneos arrojan edades para el emplazamiento del plutón de 300 ± 2 Ma. Por su parte, los circones metamórficos proporcionan una edad ligeramente más antigua que la anterior, 307 ± 3 Ma, que probablemente sea el reflejo del pico térmico del metamorfismo varisco de AT/BP. A la vista de estas dataciones se puede establecer un intervalo de tiempo, de unos 7 m.a., entre el clímax del metamorfismo varisco y el emplazamiento sincinemático (tardi-Carbonífero) de este plutón en la Zona Axial del PirineoIgneous and metamorphic zircons from the Lys-Caillaouas pluton have been identified according to their petrographic and geochemical characteristics. The igneous zircons constraint an age of 300 ± 2 Ma for the emplacement of the pluton. By contrast, the metamorphic zircons yield a slightly older age of 307 ± 3 Ma, which...
Grenvillian basement and a major unconformity within the Caledonides of Nordaustlandet, Svalbard
Precambrian …, 1995
Variously deformed granites and migmatites underlie the Neoproterozoic successions of Nordaustlan... more Variously deformed granites and migmatites underlie the Neoproterozoic successions of Nordaustlandet, Svalbard. New UPb zircon investigations of two types of intrusions from Lapponiahalvøya, northwestern Nordaustlandet, have yielded ages of 939±8 Ma ( ...
Doklady Earth Sciences, 2014
Polish Polar Research, 2012
Neoproterozoic pegmatite from Skoddefjellet, Wedel Jarlsberg Land, Spitsbergen: Additional eviden... more Neoproterozoic pegmatite from Skoddefjellet, Wedel Jarlsberg Land, Spitsbergen: Additional evidence forc. 640 Ma tectonothermal event in the Caledonides of SvalbardNeoproterozoic (c. 640 Ma) amphibolite facies metamorphism and deformation have been shown recently to have affected the Isbjørnhamna and Eimfjellet Complex of Wedel Jarlsberg Land in southwestern Spitsbergen. New SHRIMP zircon U-Pb andin situelectron microprobe monazite and uraninite U-Th-total Pb ages are presented here on a pegmatite occurring within the Isbjørnhamna metasedimentary rocks. Although the dated zircons are full of inclusions, have high-U contents and are metamict and hence have experienced notable Pb-loss, the new Cryogenian ages are consistent with the age of regional metamorphism of the host metasediments, providing additional evidence for a clear distinction of the Southwestern Province from the other parts of the Svalbard Caledonides.
Geologica Carpathica, 2009
SHRIMP U-Th-Pb zircon dating of the granitoid massifs in the Malé Karpaty Mountains (Western Carp... more SHRIMP U-Th-Pb zircon dating of the granitoid massifs in the Malé Karpaty Mountains (Western Carpathians): evidence of Meso-Hercynian successive S- to I-type granitic magmatismRepresentative granitic rock samples from the Malé Karpaty Mountains of the Western Carpathians (Slovakia) were dated by the SHRIMP U-Th-Pb isotope method on zircons. Oscillatory zoned zircons revealed concordant Mississippian magmatic ages: 355±5 Ma in Bratislava granodiorite, and 347±4 Ma in Modra tonalite. The results document nearly synchronous, successive Meso-Hercynian plutonic events from S-type to I-type granites. The Neo-Proterozoic inherited zircon cores (590±13 Ma) were identified in the Bratislava S-type granitic rocks whereas scarce Paleo-Proterozoic inherited zircons (1984±36 Ma) were detected within the Modra I-type tonalites.
Geologica Carpathica, 2012
Permian volcanics in the Northern Gemericum and Bôrka Nappe system: U-Pb zircon dating and the im... more Permian volcanics in the Northern Gemericum and Bôrka Nappe system: U-Pb zircon dating and the implications for geodynamic evolution (Western Carpathians, Slovakia) U-Pb dating (SHRIMP) of magmatic zircon ages from the Northern Gemericum Permian volcanics (Petrová Hora Formation) yielded the Concordia age of 272.4 ± 7.3 Ma for basaltic andesite, as well as the Concordia age of 275.2 ± 4 Ma for rhyodacites. Both zircon ages correspond to the Cisuralian Epoch in the time span of the Kungurian Stage. Acquired 206Pb/238U zircon age data support the nearly contemporaneous origin of the acid and basic volcanogenic members in the Northern Gemericum Permian strata. The bimodal volcanic suite proves the transtension/extension tectonic regime in the North Gemeric sedimentary basin during the Late Cisuralian. The magmatic zircon ages of rhyodacites, occurring in the lower thrust sheet of the Bôrka Nappe (Jasov Formation), gave a younger Concordia age of 266 ± 1.8 Ma proving the Guadalupian Epo...
Nurmes paragneisses in eastern Finland, Karelian craton: Provenance, tectonic setting and implications for Neoarchaean craton correlation
Precambrian …, 2007
The Neoarchaean Nurmes paragneiss belt, situated between the Ilomantsi and Kuhmo granitegreensto... more The Neoarchaean Nurmes paragneiss belt, situated between the Ilomantsi and Kuhmo granitegreenstone terrains in eastern Finland comprises mainly turbidite wacke-derived, migmatised paragneisses with minor amphibolite intercalations and younger granitoid intrusions. The ...
Polarforschung, 2000
Thc Prceambrian basement beneath the Peehora Basin of northern Russia is known from deep (up to a... more Thc Prceambrian basement beneath the Peehora Basin of northern Russia is known from deep (up to approx. 4.5 km) drill holes to be largely composed of Neoproterozoie sueeessions, variously deforrned and metamorphosed and intruded by magmatie suites of Vendian age. Presented here are new single-zircon, Pb-evaporation (Kober method) ages from eight intrusions aeross the Izhrna, Peehora and Bolshezernelskaya Zones, all from below the Lower Ordovieian (loeally Middle Cambrian) uneonformity. The majority ofthe intrusions (six) yield remarkably similar ages of 550-560 Ma, apparently dating a widespread pulse of late-to post-tectonic magmatism. An early Vendian granite (618 Ma) has been identified in the northeasternmost region (Bolshezernelskaya zone) and a Dcvonian granodiorite (380 Ma) in the Peehora Zone, where mid to late Palaeozoie magmatism has bcen prcviously reported. Evidenee of inheritanee in the zireon populations suggests the presenee of Mesoproterozoie erust beneath the Neoproterozoie eomplexcs.
Polarforschung, 1999
A linear, N-S-trending belt of elliptical, positive magnetic anomalies occurs in central Nordaust... more A linear, N-S-trending belt of elliptical, positive magnetic anomalies occurs in central Nordaustlandet, northeast Svalbard. They extend from the Caledonian and older complexes in the vicinity of Duvefjorden, southwards beneath the western margin of Austfonna and the offshore areas covered by Carboniferous and younger strata, to the vicinity of Edgeoya. One of the strangest anomalies occurs in inner Duvefjorden where it coincides with a highly magnetic guartz monzonite-granite pluton at Djupkilsodden. U-Pb and Pb-Pb zircon dating of this post-tectonic pluton defines an age of c. 415 Ma, this being based on the Pb-Pb analyses of three specimens (Pb-Pb ages of 414±10 Ma, 411±10 Ma and 408±10 Ma) and aU-Pb discordia with an upper intercept at 417+18/-7 Ma. Neighbouring felsic plutons in central Nordaustlandet, including the Rijpfjorden and Winsnesbreen granites, lack magnetic signatures in their exposed parts, but have a similar Caledonian age. The central Nordaustlandet magnetic anomalics appcar to be part of a circa 300 km long linear belt of late Silurian or early Devonian post-tectonic plutonism that characterizes the Caledonian basement of eastern Svalbard. Felsic intrusions of similar age further west in Spitsbergen are likewise both highly magnetic (Hornemantoppen batholith) andlargely non-magnetic (Newton toppen batholith 1Chydeniusbreen granitoid suite). They all appear to have been intruded at the end of the main period of Caledonian terrane assembly of the northwestern Barents Shelf. Zusammenfassung: In Zentral-Nordaustlandet, NO-Svalbard befindet sich eine N-S-gerichtete Zone von elliptischen. positiven magnetischen Anomalien. Die Anomalien erstrecken sich von kaledonischen und älteren Komplexen in der Nähe von Duvefjordcn, unter dem westlichen Rand von Austfonna und dem von karbonischen und jüngeren Schichten bedeckten Meeresboden nach SÜden bis in die Nähe von Edgeoya. Eine der stärksten Anomalien befindet sich im inneren Duvcfjorden, wo sie mit einem stark magnetischen Quarzmonzonit-Granit-Pluton bei Djupkilsodden zusammenfällt. U-Pb und Pb-Pb-Zirkondatierungen dieses posttektonischen Plutons ergeben ein Alter von ca. 415 Ma, wobei dieses Alter auf den Pb-Pb-Analysen von drei Proben basiert (Pb-Pb-Alter von 414±10 Ma, 411±10 Ma und408±10 Ma) sowie einer U-Pb-Diskordia mit einem oberen Schnittpunkt bei 417 + 18/-7 Ma. Benachbarte felsische Plutone in Zcntral-Nordaustlandet, einschließlich der Rijpfjorden-und Winsnesbreengranite, weisen in ihren anstehenden Teilen keine magnetischen Signaturen auf. sie haben jedoch ein ähnliches kaledonisches Alter. Die magnetischen Anomalien in Zentral-Nordaustlandet scheinen ein Teil einer ca. 300 km langen Zone von spätsilurischer oder frühdevonischer posttektonischer Intrusionsaktivität zu sein. die charakteristisch für das kaledonische Grundgebirge Ost-Svalbards ist. Felsische Intrusionen ähnlichen Alters weiter westlich auf Spitzbergen sind ebenfalls teils stark magnetisch (Hornemantoppen Batholith), teils unmagnetisch (Newtontoppen-Batholith 1Chydeniusbreen-Granitoid-Suite). Sie scheinen allesamt am Ende der Hauptphase der kaledonischen Orogenese des nordwestlichen Barentsschelfs intrudiert zu sein.
Minerals
We present new structural, petrographic, geochemical and geochronological data for the late Paleo... more We present new structural, petrographic, geochemical and geochronological data for the late Paleozoic–early Mesozoic granites and associated igneous rocks of the Taimyr Peninsula. It is demonstrated that large volumes of granites were formed due to the oblique collision of the Kara microcontinent and the Siberian paleocontinent. Based on U-Th-Pb isotope data for zircons, we identify syncollisional (315–282 Ma) and postcollisional (264–248 Ma) varieties, which differ not only in age but also in petrochemical and geochemical features. It is also shown that as the postcollisional magmatism was coming to an end, Siberian plume magmatism manifested in the Kara orogen and was represented by basalts and dolerites of the trap formation (251–249 Ma), but also by differentiated and individual intrusions of monzonites, quartz monzonites and syenites (Early–Middle Triassic) with a mixed crustal-mantle source. We present a geodynamic model for the formation of the Kara orogen and discuss the rel...
Open Journal of Geology
Genesis of the oldest continental crust retains a marked trace in the Earth's evolution over its ... more Genesis of the oldest continental crust retains a marked trace in the Earth's evolution over its 4.5 Ga history. Despite ample isotope data on the role of the continental crust in the Earth's evolution, there has been much debate on the origin of grey gneisses and tonalite-trondhjemite-granodiorites (TTG). Precise U-Pb (ID-TIMS) and SHRIMP data on single zircon for paragneisses and TTG (3158.2 ± 8.2 Ma) have indicated the Central-Kola and Belomorian (White Sea) megablocks of the Fennoscandian Shield to be 3.16 Ga and 3.70 Ga, respectively. The newly obtained ages of zircon from these megablocks indicate the origin of the discrete continental crust to be 3.16 and 3.70 Ga. It is close to the Nordsim zircon data on the Siurua TTG (Finland), which are 3.45 and 3.73 Ga in the core. The new summarized data on the Earth's oldest rocks (basement and continental crust) indicate the younger age of the rocks in the Fennoscandian Shield as compared to those in Australia (Kronendonk et al., 2019).
Clastic wedge provenance in the Zemplinicum Carboniferous–Permian rocks using the U–Pb zircon age dating (Western Carpathians, Slovakia)
International Journal of Earth Sciences
U–Pb (SHRIMP) detrital zircon ages from the Pennsylvanian–Permian meta-sedimentary rocks of the Z... more U–Pb (SHRIMP) detrital zircon ages from the Pennsylvanian–Permian meta-sedimentary rocks of the Zemplinicum Unit were used to characterise the provenance and the tectono-thermal evolution of the basement. The magmatic zircon ages from the contemporaneous rhyolite pyroclastics, ranging from 308 to 305 Ma, dated the Pennsylvanian sedimentary formations to the Moscovian and Kasimovian Ages. Two brakes in sedimentation within the Pennsylvanian–Permian sequence are presumed, first, flanked by Gzhelian–Asselian and second, intra-Permian. The detrital zircon age spectrum demonstrates two prominent populations: (i) Middle/Late Ordovician (age peak 459 Ma), (ii) Ediacaran–Cryogenian (age peaks 592 and 641 Ma). These, together with minor clusters from ~ 773 to 950 Ma, evidently document the Pan-African multiple magmatic events. The 1.1–1.8 Ga age gap and isolated zircons of Mesoproterozoic ages (1036–1361 Ma) are characteristic. Two populations, 1.8–2.2 Ga and 2.5–2.8 Ga, are presented within the Paleoproterozoic–Neoarchean zircons. The Zemplinicum Neoproterozoic arc crust had been affected by the extensional thermal relaxation and melting during Middle/Late Ordovician. The subsequent reworking had been connected with the Mississippian collision, followed by the Pennsylvanian/Permian extension. The presence of the Neoproterozoic detrital zircon ages including the Tonian ones permit to compare the Zemplinicum basement with the eastern peri-Gondwanan domain, which was situated at the northern margin of the Saharan Metacraton or the Arabian Nubian Shield during Neoproterozoic time.
Detrital zircons from the Hronicum Carboniferous–Permian sandstones (Western Carpathians, Slovakia): depositional age and provenance
International Journal of Earth Sciences
For the assessment of depositional age and provenance of the Hronicum Unit Pennsylvanian to Permi... more For the assessment of depositional age and provenance of the Hronicum Unit Pennsylvanian to Permian siliciclastic sediments, SIMS (SHRIMP) U–Pb analyses have been carried out on detrital zircons. To constrain the presumed provenance of the Hronicum Unit sediments five samples have been taken from two lithostratigraphic units, the Nižná Boca and the Malužiná formations. The detrital-zircon age spectrum demonstrates two prominent populations, the first, Late Pennsylvanian–Early Cisuralian (288–309 Ma) and the second, Famennian—Tournaisian (345–371 Ma). The probability density age peak at 297 Ma permits to estimate the maximum sedimentation age of the Nižná Boca Fm. to younger than Asselian and the beginning of the Malužiná Formation sedimentation has been assessed at least in Sakmarian. The sedimentation persisted, with the exception of a short break in the Wordian/Capitanian, through the Lopingian. Smaller zircon age clusters range within 446–541 Ma, with a dominance of the Cambrian detrital zircons (491–541 Ma). The Precambrian time-span is dominated by the two groups of detrital zircons; Ediacaran in the range of 545–612 Ma and Paleoproterozoic–Neoarchean ranging from 1.8 to 2.8 Ga. The documented zircon ages reflect derivation of the Hronicum sediments from the Variscan Western Carpathian crystalline basement, the Late Devonian/Early Mississippian magmatic arc. These data support close relations of the presumed Hronicum basement with the Armorican terranes and derivation from the Cadomian Belt, associated with the West African Craton during Neoproterozoic and Cambrian time.
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Papers by Alexander Larionov