Geochemistry and ore formation最新文献

{"title":"Potassium Bearing Rocks of Ukrainian Shield: Mass Balance","authors":"L.М. Stepanyik, S. Kurylo, I.М. Kotvytska, O. Hrinchenko","doi":"10.15407/gof.2019.40.058","DOIUrl":"https://doi.org/10.15407/gof.2019.40.058","url":null,"abstract":"","PeriodicalId":408258,"journal":{"name":"Geochemistry and ore formation","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116369979","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Zircon age of metarhyodacite of the aleksandrovsk suite of the mykhailivka series (megablock KMA)","authors":"G. Artemenko, L. Shumlyanskyy, A. Bekker, A. Hoffmann","doi":"10.15407/gof.2022.43.003","DOIUrl":"https://doi.org/10.15407/gof.2022.43.003","url":null,"abstract":"The LA-ICP-MS U-Pb method has been used to define the Palaeoarchaean (3264 ± 7 Ma) age of zircon from metarhyodacite of the Aleksandrovsk Suite of the Mykhailivka Series (the southeastern part of the Tim-Yastrebov structure of the Kursk Magnetic Anomaly (KMA)). According to the geochemical data, the primary melt probably developed in a crustal magmatic source due to melting of older felsic rocks. The metarhyodacite closely resemble in composition the felsic, igneous A-type granites, formed in continental rift or hot spot settings. The studied metarhyodacite of the Aleksandrovsk Suite was probably formed in association with plume emplacement into the tonalitic basement during the initial stage in the development of greenstone belts in the KMA megablock. It has high potassium content (up to 6.20 weight %), high XFe ratio (up to 0.67), low Sr content, and high content of HFSE and REEs. They are enriched in light REEs, while heavy REEs are undifferentiated. The metarhyolite shows a highly negative Eu anomaly (Eu/Eu* = 0.5). In contrast, the younger, Mesoarchean (ca. 3.12 Ga) felsic metavolcanic rocks of the Dichnya Suite of the greenstone belts of the KMA, which are close in their chemical composition to the TTGs, were generated via partial melting of mafic rocks at the vanishing stage of the mantle plume.","PeriodicalId":408258,"journal":{"name":"Geochemistry and ore formation","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114691147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geochemistry of micro elements in brown soils with moss cover of the Carpatian biosphere reserve","authors":"N. Kryuchenko, E. Zhovinsky, O. Zhuk, P. Paparyga, M. Kuhar, K. Dmytrenko, T. Popenko","doi":"10.15407/gof.2022.43.107","DOIUrl":"https://doi.org/10.15407/gof.2022.43.107","url":null,"abstract":"The microelement composition (Pb, V, Cr, Zn, Mn, Cu) of the mountain-podzolic brown earth soils of the Chornohir and Marmarо reserve massifs of the Carpathian Biosphere Reserve was determined: background, under wet and dry moss (Sphagnum palustre L.). The increased content of trace elements (Cu, V, Zn, Mn) in the upper soil layer of the Chornohir massif was determined, which is explained by the presence of a clay component, and the lower content in the Marmaros massif — the presence of carbonates. Ranked series were constructed by the dispersion coefficient of microelements in soils covered with wet and dry moss Sphagnum palustre L. It was established that the soil under dry moss is practically not depleted of microelements, but in the presence of rains it becomes wet again and the sorption process resumes. It was found that the soils under the wet moss of the Chornohir massif are most depleted in Mn, Cu, and Zn; and the Marmaros massif — Mn, Pb, and V. The geochemical behavior of the studied microelements in soils under wet moss was analyzed. It was concluded that wet moss has a selective ion exchange, is a geochemical barrier, and that is why lithochemical search and monitoring works should be carried out in the areas covered with wet moss, taking into account the established features.","PeriodicalId":408258,"journal":{"name":"Geochemistry and ore formation","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128840910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ore-bearing of the osynova area of the Mezhyrichne deposit of titanium ores","authors":"L. Figura, M. Kovalchuk","doi":"10.15407/gof.2022.43.059","DOIUrl":"https://doi.org/10.15407/gof.2022.43.059","url":null,"abstract":"Information on the geological structure and ore bearing of the Osynova area of the Mezhyrich deposit of titanium ores, which is located in the northeastern part of the Volodar-Volyn massif of the Korosten pluton and is part of one of the most promising Volyn zirconium-titanium ore districts, is presented. It was found out that the ore-bearing potential of the Osynova area is determined by a spatially and paragenetically connected ore system, which is composed of titanium-bearing rocks of the crystalline basement of the Volodarsk-Volyn complex, their weathering crusts, continental (irshan suite, apt-albian) and marine (moshno-rudnyan suite, turon) by products of erosion and redeposition of eluvium. Based on the coordinates of the wells, their description, and test results, a target database was created, which became the basis for cartographic constructions. Maps of the relief of the top, bottom and the thickness of mesozoic-cennozoic eluvial kaolins were created; redeposited kaolins and apt-albian sands; sand-silica horizon of turon. It was found that in most cases there is a direct correlation between the relief of the bottom and the top of the ore-bearing deposits. As a rule, there is an inverse correlation between the thickness of deposits and the relief of their bottom and top. A set of maps was created showing the lateral distribution of average ilmenite contents in eluvial kaolins, continental and marine aptian-albian and turonian sediments. The lateral distribution of the average ilmenite contents in the sedimentary cover formations of different ages and genetics is uneven and characterized by significant contrasts (in eluvium — 0.4-57.2 kg/m3; in apt-albian sands — 1.0-162.58 kg/m3; in re-deposited apt-albian kaolins — 1.5-125.48 kg/m3; in sand-silica horizon of the turonian — 0.6-45.57 kg/m3). The best correlation exists between weathering crust formations and aptian-albian alluvial deposits. In the deposits lying above the geological section, the correlation with the eluvium is lost. The study of the distribution of the ilmenite content in the vertical cross-section of the wells showed that the ilmenite content in the sands is uneven with one or several levels of maximum enrichment. For example, in the vertical section of the sands (from bottom to top) there are layers with different contents (kg/m3) of ilmenite: 53.0-57.0; 27.0-37.0; 39.0-41.0; 10.0-23.0; 5.2-13.3; 27.0-68.2; 7.6-9.9; 49.0-56.0. On the other hand, in redeposited kaolins, the content of ilmenite in the vertical section is mostly uniform; sometimes one distinct level of maximal enrichment is present (rarely two such levels are present). For example, with a predominant ilmenite content of 27.0-32.0 kg/m3, in the lower and upper parts there are layers with a content of 48.0-63.0 kg/m3 and 42.0-68.0 kg/m3, and in the middle part of the formation, the content is 193.0-199.6 kg/m3.In Turonian sand-silica rocks, the maximum ilmenite content is located in the lower part of marin","PeriodicalId":408258,"journal":{"name":"Geochemistry and ore formation","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126420883","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Time of formation molybdenum-bearing rocks of Virovsk ore manifestation of Volyn megablock of Ukrainian Shield","authors":"O. Vysotsky, V. Syomka, L. Stepanyuk, T. Dovbush, S. Bondarenko","doi":"10.15407/gof.2019.40.015","DOIUrl":"https://doi.org/10.15407/gof.2019.40.015","url":null,"abstract":"","PeriodicalId":408258,"journal":{"name":"Geochemistry and ore formation","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115794316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Features of the genesis of Precambrian carbonate-ferruginous rocks Ukrainian shield","authors":"K. I. Hoholev, V. Zagnitko","doi":"10.15407/gof.2019.40.048","DOIUrl":"https://doi.org/10.15407/gof.2019.40.048","url":null,"abstract":"","PeriodicalId":408258,"journal":{"name":"Geochemistry and ore formation","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115279439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mineralogical and geochemical features of ore-bearing pegmatites from Shevchenkove and Kruta Balka deposits (East-Ukrainian pegmatite province)","authors":"L. Isakov, V. Sukach, M.O. Donskyi, M.S. Kotenko, Y. Lytvynenko","doi":"10.15407/gof.2022.43.041","DOIUrl":"https://doi.org/10.15407/gof.2022.43.041","url":null,"abstract":"Ukrainian Shield is a pegmatite province. Only within the East-Ukrainian pegmatite province, thousands of pegmatite bodies of various composition, structure, geochemical and ore specialization were discovered, which are associated with three deposits of rare metals (Shevchenkove — lithium, Kruta Balka — lithium, tantalum, niobium; Mohyla Visla — zirconium, rare-earth elements). It can be assumed that several rare metal deposits of pegmatites yet remain undiscovered. However, at the moment of insufficient funding for geological exploration work, it is impossible to apply high-costly methods of geological surveying and searching. We need low-costly and, at the same time, highly effective methods of research, which could give a reliable characteristic that would indicate their prospects for rare metals when obtaining single cross-sections of pegmatite bodies. The article examines one of these directions — the study of the geochemistry of minerals, in particular microcline, and the materials of study of this mineral from the pegmatites of the Shevchenkove and Kruta Balka deposits are provided. The most widely used variation diagrams for microclines were analyzed: in K : Cs — Na2O coordinates according to V.V. Gordienko, 1970 and 1976; Rb — K : Rb according to the scheme of S.G. Shavlo, 1984 and diagram by O.P. Kalyta. It was found that these diagrams reliably classify pegmatites of the lithium-tantalum specialization of the Kruta Balka deposit, but they are not very informative for the Shevchenkove deposit, that is, for the prediction of specifically lithium deposits. The authors came to the conclusion that the analyzed charts for pegmatites of the Ukrainian Shield need significant revision, both on a significantly larger number of analyzes and taking into account the location of sampling, especially in the unproductive part of the pegmatite.","PeriodicalId":408258,"journal":{"name":"Geochemistry and ore formation","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127827260","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Xeno-autolithic nodules from kimberlites of the “Nadiia” pipe (Eastern Azov region, Ukraine)","authors":"H.H. Pavlov, O. Vyshnevskyi, Y. Lytvynenko, T. Kalinichenko","doi":"10.15407/gof.2022.43.086","DOIUrl":"https://doi.org/10.15407/gof.2022.43.086","url":null,"abstract":"Xeno-autolithic nodules from kimberlites of the Nadiia pipe (the Eastern Azov region, Ukraine) have been investigated. Based on petrographic and petrochemical criteria it was concluded that the analyzed nodules were formed according to the principle of the “snowballs” formation in the apical parts of the penetrating magma column at various pressures and temperatures. Nodules originated around xenocrysts, xenoliths and viscous magmatic clots by overgrowing them with orbicular shells under conditions of a mobile medium and flotation gas-liquid differentiation. The nodule shells are represented by porphyric kimberlite, composed of porphyric pseudomorphs of diaphtoritic minerals after olivine, clinopyroxene, phlogopite, biotite and ilmenite, and a groundmass consisted of micron-sized crystallites of calcite, barite, serpentine, perovskite, phlogopite, amphibole, chlorite, formed by crystallization of kimberlite glass of heterogeneous composition. The groundmass also contains newly formed feldspar and quartz. Accessory minerals include zircon, apatite, and rutile. Ore minerals are represented by magnetite, titanomagnetite, ilmenite, nickel and copper sulfides. Due to the assimilation of carbonate rocks by the melt, the composition of the shells, in the direction from the center to the edge of the nodules, changes from serpentine, through chlorite-serpentine to silicate-carbonate. The initial portions of the melt with olivine and phlogopite megacrysts were successively transformed into a homogeneous one. The estimated depth of kimberlite magma generation did not exceed 150 km at the initial crystallization temperatures of the silicate component of 1300-900 °C. Vitrification of the nodules groundmass in the crater zone of diatreme, estimated using monomineral phlogopite geothermometer, occurred at temperatures of 650-550 °C. The absence of diamond paragenesis minerals in nodules, in combination with other mineralogical, petrological and petrochemical criteria indicates that kimberlites of the «Nadiia» pipe are diamond barren.","PeriodicalId":408258,"journal":{"name":"Geochemistry and ore formation","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125747679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fenites Naberezhne village (Kalmius river, Azov region)","authors":"V. Morgun, S. Kryvdik","doi":"10.15407/gof.2022.43.102","DOIUrl":"https://doi.org/10.15407/gof.2022.43.102","url":null,"abstract":"In Eastern Azov (the village of Naberezhne, the left bank of the Kalmiusr river), the rocks, which mainly consists of minerals of the silica group (quartz, chalcedony), oxides and carbonates of Fe, Mn, Ca were found. They contain fluorite, as well as a small amount of acmite and ribeckite and an increased content of REE. These rocks are localized in the field of typical apogranitoid fenites, which are widely distributed in the Azov region. Oxide-carbonate-siliceous rocks are considered as the formation of the upper part of the fenitization column, where SiO2 was removed from fenitized granitoids and Fe, Mn, Ca, CO2, and REЕ, which are characteristic of carbonatites and related fenitizing fluids, were introduced. These oxide-carbonate-siliceous rocks, together with typical apogranitoid fenites, are the criteria for the search for carbonatites with apatite and rare earth mineralization.","PeriodicalId":408258,"journal":{"name":"Geochemistry and ore formation","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124334011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"U-Pb age and ore mineralization of dike lamprophires of the Roсa Islands (Wilhelm Archipelago, West Antarctica)","authors":"G. Artemenko, L. Stepanyuk, D.K. Wozniak, V. Bakhmutov, Y. Lytvynenko","doi":"10.15407/gof.2022.43.031","DOIUrl":"https://doi.org/10.15407/gof.2022.43.031","url":null,"abstract":"The dike of lamprophyres of the Roсa Islands chemically correspond to the basic rocks of the calc-alkaline series with high magnesian #mg 0.56. They have an increased content of Y (41.6 ppm) and Yb (11.5 ppm), which indicates the absence of garnet in the magmatic source. Rare earth elements are weakly differentiated — (La/Yb)N = 3.64). A deep negative European anomaly is distinguished — Eu/Eu*=0.36, which is probably due to the fractionation of plagioclase in the crustal magmatic source. Polymetallic mineralization for copper (445 g/t), zinc (207 g/t), lead (123 g/t) and tungsten (28.7 g/t) was found. Zircon from lamprophyres is represented by two types of crystals. The first type – transparent yellowish-pink individuals with a pyramidal-prismatic habit. In terms of quantity, it dominates; the second type is the formation of a flat outline. Dimensions are usually 0.3—0.7 mm along the L4 axis. Crystals of the first type were selected for geochronological research. It was found that the lamprophyre zircon contains very little lead, and a significant part of it is the lead isotope 204Pb. For this reason, age values for uranium-lead ratios of 238U/206Pb are more reliable. It was determined that the uranium-lead age of zircon from lamprophyres is within 50—60 Ma. Primary melt inclusions and less often mineral inclusions were found in zircon crystals. The former can sometimes occupy up to 30% of the crystal volume. Among the mineral inclusions, potassium feldspar, albite and potassium-sodium feldspar, apatite, and quartz were diagnosed. One primary inclusion of CO2 fluid was detected, the remaining inclusions are represented by primary crystallized melt inclusions. Rooting of the lamprophyre dyke is probably associated with the stress stresses experienced by the granodiorite plutons as a result of later tectonic movements.","PeriodicalId":408258,"journal":{"name":"Geochemistry and ore formation","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123376801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}