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U–Pb LA-ICP-MS geochronology of polygenetic zircons from Beshta and Kamenistaya intrusions(the Greater Caucasus)

Acta Geochimica 2022年第6期41卷 1019-1029页

作者： David Shengelia Leonid Shumlyanskyy Giorgi Chichinadze Tamara Tsutsunava Giorgi Beridze Irakli javakhishvili al.janelidze institute of geology of iv.javakhishvili tbilisi state university TbilisiGeorgia School of Earth and Planetary Sciences Curtin UniversityPerthAustralia M.P.Semenenko institute of Geochemistry Mineralogy and Ore FormationKyivUkraine

The Beshta-Kamenistaya intrusions are located in the Main Range structural zone of the Greater *** are composed of tonalitic gneisses that genetically resemble granites of the tholeiitic series of the ophiolitic *** Beshta-Kamenistaya orthogneisses and associated rocks of the nappes differ markedly from those of the Main Range *** of them were overthrust to the Main Range zone during the Bretonian *** age of their protolith and the metamorphism are still not *** the zircon U-Pb LA-ICP-MS dating two age populations of zircons have been distinguished in the rocks of the Beshta-Kamenistaya *** age of the main population of zircons from orthogneisses is 426-300 *** age groups can be distinguished in this *** main group yielded a Concordia age of386.9±1.4 *** are also smaller peaks at 409-405,375-373,and 351 *** oldest ages(426-395 Ma)were detected in the core parts of the complex *** assume that the crystallization of the parental for orthogneisses rocks(tonalities)took place at 410-395 Ma,whereas the Concordia age of 386.9±1.4 Ma and a peak at 375-373 Ma correspond to the metamorphic *** whole metamorphic cycle,including progressive and regressive stages,occurred between 395 and 370 ***,dated in the Beshta-Kamenistaya intrusion at350 Ma and younger,correspond to the Late Variscan *** dated 3102-2769 Ma represent xenocrysts captured by the melts during their formation from the ancient rocks in the crystalline basement.

关键词： The Greater Caucasus Magmatism Metamorphism Orthogneisses U–Pb zircon dating

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Crustal and Mantle Sources at Various Settings of Phanerozoic Geodynamic Development Expressed in Volcanism and Metallogeny of Eurasian Active Margin

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Journal of Environmental Science and Engineering(A) 2018年第9期7卷 361-386页

作者： Vladimir I.Gugushvili Department of Metallogeny Al.Janelidze Institute of GeologyIv.Javakhishvili Tbilisi State UniversityJikia 16Tbilisi 0186Georgia

Phanerozoic geodynamic development of the Tethys ocean revealed at Eurasian active margin is manifested in pre-and post-collision *** Phanerozoic crust was already divided into sialic and basaltic crusts and rigid upper *** precious and nonferrous metals were redistributed between *** the sialic crust,precious metals are concentrated: Au,Ag and Pb,in basaltic crust—zinc,the copper mainly rests in the *** plate-tectonics was manifested in the following settings: island arc,inter/backarc and *** arc setting correlates with steady-state subduction and controlled by calc-alkaline *** this stage,the sialic,basaltic crust and mantle material participate in volcanism,whereas the subducted slab plunged in mantle,the metallogenic indicators are Au,Pb,Zn and *** stage of inter/backarc is related to steepening of subducting slab,because mantle diapir incursion provokes the *** the initial stage and at stage of slackening rifting,when the sialic crust is not yet spread out from zone of volcanic activity,mineralization was represented by subalkaline trachydacites,shoshonite and alkali basaltic volcanism(volcanological indicators)and Au and Pb are participated with Zn and Cu in *** strengthening of steepening with mantle diapir incursion on higher level rifting spread out the sialic crust,volcanism on this stage is tholeiitic and mineralization is represented by zinc-copper-pyrite VMS(Volcanogenic Massive Sulphide)*** minor ocean setting is controlled by the most intensive spreading provoked by incursion mantle diapir at highest level,and spread out the basaltic crust as well,and volcanism belongs to ophiolites with dunite-peridotite magmatic *** mineralization was represented by copper-pyrite ores and single metallogenic indicator is the *** convergence of Eurasian and Afro-Arabian continents and closing of Tethys Ocean resulted in transferring the pre-collision stage in post-colli

关键词： Pre-collision stage volcanologic indicator metallogenic indicator

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Geodynamic Development of Eurasian Active Margin at Pre-collision Subduction and at Post-collision Closing of Tethys Ocean

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Journal of Environmental Science and Engineering(B) 2021年第6期10卷 251-260页

作者： Vladimir I.Gugushvili Department of Metallogeny Al.Janelidze Institute of GeologyIv.Javakhishvili Tbilisi State UniversityJikia 16Tbilisi 0186Georgia

Geodynamic development of Eurasian Active Margin is related to Phanerozoic collision and closure of Tethys Ocean coincided with northvergent movement and stressing of Afro-Arabian continent at the Eurasian *** collision coincided with subduction oceanic Slab under margin of continent at pre-collision stage revealed in formation of island arc,inter-arc backarc and minor ocean settings at pre-collision *** closure of ocean the subduction is terminated and pre-collision stage transferred in post-collision and orogenesis,caused by stressing Afro-Arabian continent at the *** of subduction determined the settings of pre-collision *** island arc setting is related with steady state subduction,interarc-backarc and minor ocean settings are controlled by steepening of subducting slab which caused invasion of mantle diapir extension and spreading the crust revealed in rifting in interarc-backarc and intensive spreading in minor ocean setting,whereas at island arc setting the mantle invasion and spreading did not ***,scale of mantle material participation in various settings determined character of volcanism and *** island arcs are characterized by calc-alkaline rhyo-dacite-andesite-basalt volcanism blocking tectonics,revealed in island uplifting and gold-base metal *** interarc-backarc settings revealed in tholeiite-olivine basaltic volcanism,rifting and Zn-Cu mineralization the minor ocean setting controlled by ophiolite volcanism ultimatic dunite-peridotite-magmatism and the most intensive spreading of lithosphere and copper-pyrite mineralization confirmed by volcano-petrogenic,metallogenic and tectonic indications and geochemical ***,type of volcanism,magmatism and mineralization at precollision development are controlled by scale and influence of crustal-mantle *** post-collision stage of geodynamic development also is characterized by various scales of crustal mantle influence.O

关键词： Geodynamic pre-collision post-collision indicators

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Geodynamic Development of Eurasian Active Margin during Closing of Thetys Ocean, Depending on the Scale of Mantle-Crustal Sources Influence at Pre- and Post-collision Settings, Controlled by Geological and Geochemical Indicators

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Journal of Environmental Science and Engineering(B) 2020年第6期9卷 248-260页

作者： Vladimir I.Gugushvili Department of Metallogeny Al.Janelidze Institute of GeologyIv.Javakhishvili Tbilisi State UniversityJikia 16Tbilisi 0186Georgia

Phanerozoic geodynamic evolution development of Tethys Ocean,its collision and closing,revealed at the Eurasian active margin in pre-and post-collision stages during convergence of Afro-Arabian and Eurasian *** of oceanic slab under continental margin revealed in steady state subduction and steepening of subducting slab provoked the incursion of mantle *** steady state subduction is related with island arc setting whereas steepening provoked incursion of mantle diaper interarc-backarc and minor ocean *** are controlled by geological indicators—volcagenic,petrochemical,geochemical,tectonic and *** of them is determined by scale of mantle-crustal influence,controlled by intensity and level of mantle diapir incursion in the crust rising from interarc-backarc to minor oceanic *** island arc setting is characterized by blocking,which as others by extension of rifting(interarc-backarc)caused spreading out from zone of volcanic activity and mineralization sialic crusts,whereas minor ocean setting caused by spreading out from zone of volcanic activity and mineralization sialic and basaltic *** mantle crustal influence rising from island arc to minor ocean settings controlled type of volcanism and mineralization in pre-collision *** the closing of ocean occurred the precollision setting which is transferred in post-collision revealed in *** is divided in two *** first initial stage occurred in penetration hot fluids from the mantle in sialic crust smelted from in granitoid melt and leached the gold and trace melts Sb,W,Mg and Hg from sialic *** latter are geochemical indicators of post-collision *** second final stage revealed in shoshonite-basalt volcanism activity occurred with penetrated mantle material into deep volcanic chambers and characterized with increasing of mantle influence than initial stage of post-collision activity.

关键词： Pre- and post-collision settings crustal-mantle sources geological indicators

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Relation of Tethys Ocean Subduction, Collision and Closure with Regional Metamorphism, Volcanism and Mineralization Exemplified on the Eurasian Active Margin

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Journal of Environmental Science and Engineering(A) 2019年第6期8卷 257-271页

作者： Vladimir I.Gugushvili Department of Metallogeny Al.Janelidze Institute of Geology.Iv.Javakhishvili Tbilisi State UniversityJikia 16 Tbilisi 0186Georgia

The geodynamic development of Eurasian active margin is related to subduction,collision and closure of Tethys *** is divided on pre-collision and post-collision *** pre-collision development controlled by subduction,whereas post-collision related by orogenesis,granodiorite magmatism gold base and trace metals(Sb,W,Mo and Hg)*** mentioned trace metals association is the geochemical indicator of first stage of post-collision *** second stage revealed in andesite basalt,shoshonite,olivine basalt and tholeiite volcanic ***-collision stage is controlled by steady state subduction related with metamorphism and calc-alkaline volcanic activity in subaqual and island conditions of island arc *** is lately with steepening of subducting slab and incursion of mantle diapir transferred in interarc-backarc and minor ocean setting with shoshonite-trachyandesite and alkali olivine basalt and tholeiite volcanism and later with ophiolite volcanism,dunite-peridotite magmatism and Cu-pyrite mineralization of minor ocean *** pre-collision stage is developed temporally and spacially along dipping of subducted slab in the island arc setting transferring in the backarc-interarc and minor ocean *** similar transferring occurs laterally to dipping of slab and ascending *** alternation of settings shown the cycling along dipping spatial and temporal alternation of island arc,backarc and minor ocean *** to dipping alternation is only spatial,whereas in ascending succession cycling is only temporal,localized *** pre-collision development occurs in subaqual condition,whereas related to orogenesis post-collision development is mainly subaerial.

关键词： Phanerozoic geodynamics Tethys Ocean Eurasian active margin metallogeny

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Volcanogenic Deposits of Non-ferrous Metals in the Lesser Caucasus and Eastern Pontides

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Journal of Geological Research 2021年第4期3卷 1-20页

作者： S.Kekelia N.Gagnidze I.Mshvenieradze G.Kharazishvili Department of mineral deposits and geochemistry Al.Janelidze Institute of Geology of Ivane Javakhishvili Tbilisi State UniversityGeorgiathe U.S.

The paper presents brief characteristics of geological environments of ore deposit occurrences in Turkey,Georgia and *** can be attributed to Kuroko-type deposits,being distinguished by the character of ore *** the west,in Turkey,there are epigenetic and hydrothermal-sedimentary copper-zinc deposits that were formed in deep restricted basinal *** example of the latter is the Chayeli *** the east,in the Caucasus,we have predominantly only epigenetic ***,in the Bolnisi mining district(Georgia)there is the Madneuli deposit which represents an example of polyformational ***,within the restricted territory,have been concentrated:barite,barite-polymetallic,gold-bearing secondary quartzite,large-scale stockworks of copper *** by the 87Sr/86Sr ratios,some volcanites which are spatially associated with ores,might have been products of the“differentiation”of undepleted mantle,or other magmas that were generated in the lower part of the earth *** the alaverdi ore district in Armenia,there are Jurassic volcano-depressions that host copper,copper-zinc and barite-sulfide *** the deposits of the alaverdi district,porphyry copper including,contain economic reserves of *** the basis of available literature material and our own data,there has been created a mental-logical geological-genetic model of volcanogenic deposits.

关键词： Kuroko-type deposits Madneuli Chayeli Paleoisland Undepleted mantle Ore

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Impact of Anthropogenic Factor on Karst Landscape (Zemo Imereti Structural Plateau Case Study), Georgia, Caucasus

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Open Journal of geology 2020年第7期10卷 771-783页

作者： Zaza Lezhava Kukuri Tsikarishvili Lasha Asanidze Nino Chikhradze Guranda Avkopashvili Tamari Tolordava Vakhushti Bagrationi institute of Geography Iv. Javakhishvili Tbilisi State University Tbilisi Georgia School of Natural Sciences and Medicine Ilia State University Tbilisi Georgia Elevter Andronikashvili institute of Physics Iv. Javakhishvili Tbilisi State University Tbilisi Georgia

The Zemo Imereti (Chiatura) Structural Plateau covers the easternmost part of the western Georgia limestone belt and is the only region of the platform karst in the entire Caucasus. Zemo Imereti Plateau’s complex structural studies revealed that the karst landscape has been completely transformed due to human strong economic activities, mainly related to the manganese unplanned, predatory extraction. The ore mining process completely destroyed the soil and vegetation cover thus creating “anthropo-badlands”. Due to manganese open-cast mining, the layers located over limestones are almost totally removed and heavy rains stipulate intense washout of substances from loose rocks. Intense washout of manganese extracted from mines and high contamination of river water streams take place directly in the river beds. Karst sinkholes and wells are common in the plateau, which are often used as waste fills-storages by the local population. Contaminated underground karst waters flowing into the above mentioned landforms are directly related to the karst springs used by the population and occasionally cause their turbidity and contamination, which is also confirmed by our indicator tests. As a laboratory study of the samples showed, mineralization of underground karst waters in the study area is 1.5 - 3 times higher than similar values in neighboring karst areas, which should be explained by the widespread of manganese open pits in the feeding basins of underground karst waters. According to the materials obtained from our surveys and calculations carried out, karst (chemical) denudation (surface 64.2 - 190.6 m3/km2/year, underground 1.5 - 117.0 m3/km2/year) has been increased in the study area than in other karst regions of Georgia, which is also related to technologic factors.

关键词： Karst Anthropogenic Factor Geoecology Georgia

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