Geochemistry and ore formation最新文献_第3页

Uranium-lead isotopic age of monazites of plagiogneyses of the Ingulo-Inguletse series (Ingul megablock of the Ukrainian Shield) 乌克兰地盾英古尔巨岩英古尔系列斜长岩单独居石铀铅同位素年龄

Geochemistry and ore formation Pub Date : 1900-01-01 DOI: 10.15407/gof.2022.43.012

L. Stepanyuk, O.B. Vysotskyi, O. Kovtun, S. Kurylo, T. Dovbush

{"title":"Uranium-lead isotopic age of monazites of plagiogneyses of the Ingulo-Inguletse series (Ingul megablock of the Ukrainian Shield)","authors":"L. Stepanyuk, O.B. Vysotskyi, O. Kovtun, S. Kurylo, T. Dovbush","doi":"10.15407/gof.2022.43.012","DOIUrl":"https://doi.org/10.15407/gof.2022.43.012","url":null,"abstract":"Among the supercrustal formations of the Ingul megablock, Paleoproterozoic rocks, represented by the Ingul-Ingul series, are significantly predominant. In general, the composition of the Ingul-Ingulets series includes (from bottom to top): Zelenorichen, Artemiv, Rodioniv, Kamyano-Kostovatsky (age analogue of Spasivsk) and Roschakhiv (age analogue of Chechelivsk) worlds. The Chechelivsk suite is represented by biotite and garnet-biotite gneisses, places with sillimanite and cordierite, as well as underlying layers of pyroxene gneisses and schists. Suite rocks are widespread within the Ingul Synclinorium, in the framework of the Korsun-Novomyrhorod pluton and in the northern part of the Bratsky Synclinorium. Currently, the age of monazites from plagiogneisses distributed in the Novgorodkiv quarry and south of the village Lavrovka has been determined using the uranium-lead isotope method. The obtained monazite isotopic age values of 2022.9 ± 6.7 Ma and 2031.5 ± 1.5 Ma, respectively, can only serve as the upper age limit for the formation of the Ingul-Ingul series. Analysis of the internal structure of zircon crystals from plagiogneiss distributed south of Lavrivka, showed that the majority of zircons are complex. In almost all crystals there are mainly thin shells of light pink zircon. Light pink zircon cores are found in the middle of the light pink crystals. Crystals with a brown color have a more complex structure. Along with isometric cores of light pink zircon, cores with fine «magmatic» zoning occur, as well as highly fractured uniform brown cores and complex cores.On this basis, it is assumed that this plagiogneiss was formed by clastogenic material from several sources.","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":"130099515","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}

引用次数: 0

The mantle source of fluids for the U-bearing Na-metasomatites of the central-ukrainian uranium province inferred from Pb, Sr and Nd isotope composition 根据Pb、Sr和Nd同位素组成推断乌克兰中铀省含铀钠交代岩的地幔流体来源

Geochemistry and ore formation Pub Date : 1900-01-01 DOI: 10.15407/gof.2022.43.020

L. Shumlyanskyy

{"title":"The mantle source of fluids for the U-bearing Na-metasomatites of the central-ukrainian uranium province inferred from Pb, Sr and Nd isotope composition","authors":"L. Shumlyanskyy","doi":"10.15407/gof.2022.43.020","DOIUrl":"https://doi.org/10.15407/gof.2022.43.020","url":null,"abstract":"The results of the determination of Sr, Nd and Pb isotope composition in U-bearing Na-metasomatites of the Central-Ukrainian Uranium Province are reported. In total, 23 samples representing 5 deposits, were studied. The obtained results reveal the similarity of the Sr and Nd isotope composition between the metasomatic rocks and their host rocks. However, metasomatic rocks in general have a lower 87Sr/86Sr ratio that indicates a presence of a more “primitive” juvenile component in their composition. The constructed Pb-Pb isochron has yielded an age of 1810 ± 17 Ma, in good agreement with the previously obtained results. This age confirms the simultaneity of the formation of Na-metasomatites and the emplacement of the numerous mafic dykes widely distributed in the area. Apparently, metasomatic fluids were generated in the upper mantle and their ore potential was inherited from the mantle source. The formation of the huge volumes of the mantle-derived fluids is linked to the establishment of the Prutivka-Novogol large igneous province and emplacement of the large anorthosite-mangerite-charnockite-granite plutonic complexes (Korosten and Korsun-Novomyrhorod complexes) that also belong to the province.","PeriodicalId":408258,"journal":{"name":"Geochemistry and ore formation","volume":"7 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":"126055460","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}

引用次数: 0

U-Pb Age, by Zircon, of the Pre-Klesiv Breed Association of the Osnytsky Block Osnytsky地块Pre-Klesiv品种协会的锆石U-Pb年龄

Geochemistry and ore formation Pub Date : 1900-01-01 DOI: 10.15407/gof.2021.42.080

O. Vysotsky, L. Stepanyuk, L. Shumlyanskyy

{"title":"U-Pb Age, by Zircon, of the Pre-Klesiv Breed Association of the Osnytsky Block","authors":"O. Vysotsky, L. Stepanyuk, L. Shumlyanskyy","doi":"10.15407/gof.2021.42.080","DOIUrl":"https://doi.org/10.15407/gof.2021.42.080","url":null,"abstract":"The Osnytsky block is an integral part of the Osnytsky-Mikashevytsky volcanic-plutonic belt, represented by early proterozoic igneous rocks of different compositions. This is a new type of igneous belts for the early precambrian – a paleotypical analogue of intracontinental volcanic-plutonic belts by the phanerozoic, which was formed in the conditions of mature continental crust in the initial stage of radical structural rearrangement of the cratonized gneiss base of the Eastern European platform. Volcanogenic formations have undergone regional metamorphism at a level not higher than the epidote-amphibolite facies, classified in the klesiv series, which combines effusives of basic, acidic and medium composition and occupies a higher stratigraphic position compared to the metamorphites of the teteriv series. Intrusive rocks (gabbro-diorite-granodiorite granite association) – to the osnitsky complex. Rocks of the osnitsky complex are widespread, they account for 80-85% of the area of the Osnitsky block. The pre-klesiv association, represented mainly by gneisses of the teteriv series and plagiogranitoids of the sheremetivsky complex, has a limited distribution. The LA-ICP-MS U-Pb method was applied to date zircon from plagiogranite and plagiomigmatite of the sheremetivsky complex, and from gneiss and amphibolite. The plagiogranite yielded an age of 2110 ± 8, and plagiomigmatite of 2165 ± 22 Ma. Hence, granitoids of the sheremetivsky complex in the Osnitsk block were formed between 2.16 and 2.11 Ga. The age of the metamorphism of gneisses was defined as 2198 ± 29 Ma, whereas zircon from amphibolite crystallized at 1981 ± 36 Ma. Correspondingly, gneiss can be attributed to the teteriv series, whereas amphibolite can belong to either osnitsky complex, or nartsyzivsky complex.","PeriodicalId":408258,"journal":{"name":"Geochemistry and ore formation","volume":"24 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":"132712447","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}

引用次数: 1

Peculiarities of the composition of the high-titanium ultramafite dyke in the Andriivka open pit (the Eastern Azov area of the Ukrainian shield) 安德里夫卡露天矿(乌克兰盾区东亚速地区)高钛超镁铁岩脉组成的特殊性

Geochemistry and ore formation Pub Date : 1900-01-01 DOI: 10.15407/gof.2019.40.040

V. Gatsenko, S. Kryvdik, S. Kushnir

引用次数: 1