Geochemistry International最新文献

{"title":"Geochemistry of the Massive Dolomites in Eastern Black Sea Region: REE Implications for Dolomite Petrogenesis","authors":"Merve Özyurt,&nbsp;M. Ziya Kırmacı,&nbsp;Ihsan S. Al-Aasm,&nbsp;Raif Kandemir","doi":"10.1134/S0016702923020118","DOIUrl":"10.1134/S0016702923020118","url":null,"abstract":"<p>Dolomitization is an important diagenetic process observed in carbonate rocks ranging in age from Precambrian to Holocene. The formation of massive dolostone bodies has long been a challenge due to complex sedimentary and diagenetic conditions. The presence of massive dolostone successions which pervasively occur in the Late Jurrasic-Early Cretaceous carbonates in Eastern Pontides (NE Turkey) can provide an excellent opportunity to gain a better understanding of the dolomitization process. Previous studies of these carbonates interpreted dolomite as a replacement phase after calcite formed at shallow burial depths. The nature of fluids for dolomitization has been attributed to the Late Jurassic–Early Cretaceous seawater. Here, we report new geochemical data, including rare earth elements (REEs) on the formation of dolomites of the Berdiga Formation and its relationship to the Late Jurassic magmatic event. These dolomites are grouped into two categories: (1) microcrystalline replacive dolomites (D1 and D2) corresponding to the shallow subsurface realm formed at relatively low-temperature conditions from seawater parentage fluids, and (2) coarse-crystalline replacive dolomites (D3) and cement dolomite (Cd) formed at shallow to intermediate burial depth under relatively high-temperature conditions from seawater affected by the hydrothermal fluid flux in Late Jurassic-Early Cretaceous. High-temperature input can be inferred from high fluid inclusion homogenization temperatures (170–210°C), low δ¹⁸O values, relatively high Eu/Eu*, Eu/Sm and Sm/Yb ratios, low Y/Ho ratios, and enrichment of LREE over HREE in these dolomites compared to the seawater signatures. The Late Jurassic magmatic event may have provided a heat supply for the generation of high-temperature input to the ambient seawater. This probably led to the rapid convection and circulation of seawater in the carbonate strata resulting in a water-rock alteration process and massive dolomitization. Therefore, we suggest that the dolomites in the Eastern Pontides are mainly formed at shallow burial associated with the Late Jurassic Magma generation. This model provides new insights into the mechanism of dolomite formation associated with a contemporaneous magmatic activity.</p>","PeriodicalId":12781,"journal":{"name":"Geochemistry International","volume":"62 2","pages":"184 - 207"},"PeriodicalIF":0.7,"publicationDate":"2023-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138563234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Environmental Geochemical Characteristics of Selenium in Northeast China","authors":"H. M. Dai,&nbsp;I. Savin,&nbsp;Y. H. Zhang,&nbsp;S. Liang,&nbsp;Y. J. Cui,&nbsp;C. Q. Chen,&nbsp;K. Liu,&nbsp;Y. H. Song","doi":"10.1134/S0016702923020106","DOIUrl":"10.1134/S0016702923020106","url":null,"abstract":"<p>Selenium is an important element for human health. Many studies have identified selenium deficiency in soil and water as an important factor in causing Keshan Disease (KD) in Northeast China. Previous studies have mainly focused on soil selenium content, staple food selenium content, and human selenium level, but there are few systematic studies on soil selenium’s existing forms and their migration from soil to crops and the human body. This paper focused on inferring the barrier factors in the migration of selenium from soil to crop and the human body and transformation of its compounds. It provides a reference basis for the etiological analysis, prevention, control, and elimination of KD. The study used 121 183 samples of topsoil (0−20 cm), 30 295 soil parent samples of selenium and other geochemical indices in northeast China, and crop seeds and human hair samples from the KD endemic area. The surface soil selenium was dominantly selenium-sufficient in Northeast China. However, the soil selenium levels were generally low. The average topsoil selenium in Northeast China was 0.20 mg/kg, significantly lower than the world’s average soil selenium content (0.4 mg/kg) and slightly lower than the Chinese average soil selenium content (0.24 mg/kg). Soil selenium mainly existed in strongly bounding by organic bound, with humic acid, and residue forms. The amount of selenium available to plants was sufficient in the selenium-sufficient and KD-endemic areas. However, the average selenium content of human hair was deficient, on average, with 0.16 mg/kg in KD endemic area. We assume that lower soil selenium content may be the basic factor influencing the biogeochemical deficiency of selenium in Northeast China. The sequestration of selenium by clay chemical constituents, such as iron and aluminum oxides and soil organic matter, especially in acidic soils, is another direct contributing factor to the low selenium content in biogeochemical food chain, which increases the risk of KD in the population.</p>","PeriodicalId":12781,"journal":{"name":"Geochemistry International","volume":"62 3","pages":"314 - 326"},"PeriodicalIF":0.7,"publicationDate":"2023-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138563423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Erratum to: Geochemistry (TE, REE, Oxygen) of Zircon from Leucogranites of the Belokurikhinsky Massif, Gorny Altai, as Indicator of Formation Conditions","authors":"E. V. Levashova,&nbsp;M. E. Mamykina,&nbsp;S. G. Skublov,&nbsp;O. L. Galankina,&nbsp;Q.-L. Li,&nbsp;X.-H. Li","doi":"10.1134/S0016702923210048","DOIUrl":"10.1134/S0016702923210048","url":null,"abstract":"","PeriodicalId":12781,"journal":{"name":"Geochemistry International","volume":"61 11","pages":"1220 - 1220"},"PeriodicalIF":0.8,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0016702923210048.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134795423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Isotopic (δ13C, δ18O) Analysis of Small Amounts of Carbonate in Silicate Rocks by the Continuous Flow Isotope Ratio Mass Spectrometry Method","authors":"E. O. Dubinina,&nbsp;Y. N. Chizhova,&nbsp;S. A. Kossova","doi":"10.1134/S0016702923110034","DOIUrl":"10.1134/S0016702923110034","url":null,"abstract":"<p>An experimental study of the main factors affecting the accuracy of oxygen and carbon isotopic analysis in carbonates dispersed in silicate matrix is carried out. Artificial 1, 2, 5, and 10% mixtures of quartz with carbonates with different isotopic parameters (KH-2, Ko, MCA-8) were analyzed by continuous flow isotope ratio mass spectrometry (CF IRMS). It is established that, in addition to the influence of the instrumental nonlinearity, the results are affected by two factors: trace amounts of CO₂, constantly present in the system (the blank effect) and the presence of chemically neutral silicate particles (the matrix effect). The blank effect depends on the isotopic parameters of the sample and has very little influence on the estimated carbonate content in the rock. The matrix effect, on the contrary, strongly affects the estimated carbonate content, and produces the isotopic shift towards underestimated contents of heavy ¹³C and ¹⁸O isotopes. It is shown that this effect is related to the processes occurring near the CO₂–acid–quartz interface, which are accompanied by kinetic fractionation of carbon and oxygen isotopes. Both effects are dependent on the amount of silicate matrix in the system and most clearly manifested during analysis of carbonate-poor rocks. When the carbonate content in the rock is about 1–2%, deviations from the true δ¹³C and δ¹⁸O values can reach the first ppm, while carbonate content obtained by chromatographic peak calibration can be underestimated by 20–40%.</p>","PeriodicalId":12781,"journal":{"name":"Geochemistry International","volume":"61 11","pages":"1164 - 1176"},"PeriodicalIF":0.8,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0016702923110034.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134796645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Biogeochemical Assessment of Toxicity and Radioecological Danger of the Transboundary Kara-Balta River","authors":"B. M. Djenbaev,&nbsp;V. P. Solodukhin,&nbsp;B. K. Kaldybaev,&nbsp;B. T. Zholboldiev,&nbsp;S. G. Lennik,&nbsp;M. A. Severinenko,&nbsp;W. J. Karmysheva","doi":"10.1134/S0016702923100038","DOIUrl":"10.1134/S0016702923100038","url":null,"abstract":"<div><div><p><b>Abstract</b>—The paper presents the results of researches of the concentration of chemical elements and natural radionuclide in the environmental objects of the Kara-Balta transboundary river basin (adjacent territories of Kyrgyzstan and Kazakhstan). The level of contamination of floodplain soils and bottom sediments of the Kara-Balta River with such chemical elements as U, Sb, As, Th, Pb, Sc, Co, Cu, Mo, Zn, V, Sr, Ba, Cs was established. Based on the calculated indicators of the contamination factor (CF), enrichment factor (EF), and index of geoaccumulation (Igeo), it was found that Sb, As and Br make the largest contribution to soil and bottom sediment pollution in the Kara-Balta water basin. At three checkpoints, an increased concentrations of U, B, Li, Sr, Mo were found in the water samples of the region’s reservoirs, which is related to the influence of the tailings of the Kara-Balta mining plant. The elevated concentrations of As, B, Ba, Co, Mn, Sb, V, and Zn were also established around the mouth of the Kara-Balta River, which flows into the Tasotkel reservoir (Kazakhstan). The results of the research can be explained by the fact that a significant part of the Kara-Balta transboundary river basin is located in the zone of a uranium natural–technogenic province.</p></div></div>","PeriodicalId":12781,"journal":{"name":"Geochemistry International","volume":"61 11","pages":"1205 - 1215"},"PeriodicalIF":0.8,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134796439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Erratum to: An Equation for the Calculation of Saturated Water Contents in Silicate Melts: A New Version","authors":"Ya. Yu. Gnuchev,&nbsp;D. A. Bychkov,&nbsp;E. V. Koptev-Dvornikov","doi":"10.1134/S0016702923210012","DOIUrl":"10.1134/S0016702923210012","url":null,"abstract":"","PeriodicalId":12781,"journal":{"name":"Geochemistry International","volume":"61 11","pages":"1217 - 1217"},"PeriodicalIF":0.8,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0016702923210012.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134796441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Source and Generation Parameters of the Granitoid Melts of the Archean Charnockite–Enderbite Complex in Karelia, with Reference to the Pon’goma-Navolok Massif","authors":"V. M. Kozlovskii,&nbsp;E. B. Kurdyukov,&nbsp;M. A. Yakushik,&nbsp;V. V. Travin,&nbsp;T. F. Zinger,&nbsp;A. I. Yakushev,&nbsp;M. M. Fugzan,&nbsp;T. I. Kirnozova,&nbsp;S. A. Ushakova","doi":"10.1134/S0016702923090069","DOIUrl":"10.1134/S0016702923090069","url":null,"abstract":"<p>The paper presents authors’ original detailed data on rocks of the Archean Pon’goma-Navolok charnockite−enderbite complex in northern Karelia. The rocks practically have not been modified and are preserved within a rigid block among Paleoproterozoic zones of ductile deformations and metamorphism. The geochemistry of the rocks and their isotope−geochemical features indicate that the protolith from which the enderbite melts of the main phase of the massif were derived may have been amphibolites. The enderbite melts were derived from these amphibolites under the effect of K₂O-, Na₂O-, and SiO₂-bearing fluids; and the enderbites were subsequently charnockitized with the involvement of fluids enriched in K₂O and SiO₂. Physicochemical modeling indicates that the enderbite melt was derived from the amphibolite protolith at a depth of about 45 km (<i>P</i> = 14.8 kbar, <i>T</i> = 1030−1080°C) under the effect of saline H₂O−CO₂ fluid. Comparison of the <i>P</i>−<i>T</i> parameters of the granulite-facies metamorphism of the metabasites and the parameters under which the enderbite melts were derived indicates that Archean granulite-facies metamorphism in the Belomorian belt in northern Karelia was of contact but not regional nature and was induced by the high-temperature field of an emplaced enderbite massif. The orthogneisses hosting the Pan’goma-Navolok massif inherit geochemical features of the unsheared, ungneissose, and unmetamorphosed enderbites. This means that enderbites analogous to those of the Pan’goma-Navolok massif may have served as the protolith of some of the orthogneisses, and that enderbites may have been spread more widely in the Archean than the currently preserved single enderbite massifs.</p>","PeriodicalId":12781,"journal":{"name":"Geochemistry International","volume":"61 11","pages":"1109 - 1127"},"PeriodicalIF":0.8,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0016702923090069.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134796579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geochemistry of Rocks at the Neskevara Rare-Metal Deposit of the Vuoriyarvi Alkaline–Ultramafic Complex, Kola Peninsula","authors":"N. V. Sorokhtina,&nbsp;T. A. Lipnitsky,&nbsp;A. V. Zhilkina,&nbsp;A. I. Yakushev,&nbsp;N. N. Kononkova","doi":"10.1134/S0016702923110101","DOIUrl":"10.1134/S0016702923110101","url":null,"abstract":"<p>The Vuoriyarvi Paleozoic alkaline–ultramafic complex with carbonatites is made up of a great diversity of rocks with various ore mineralization. The paper presents data on the geochemistry of pyroxenites, phoscorites, and carbonatites from the Neskevara deposit of rare metals. The pyroxenites of the rare-metal deposit are significantly enriched in Nb, Ta, and Th relative to the primitive mantle and the primary alkaline–ultramafic melt composition calculated for the Kola alkaline province and are characterized by high Nb/Ta, Zr/Hf, and Th/U ratios of 29, 35, and 14, respectively. HFSE are maximally enriched in the phoscorites and carbonatites of stages II and III, with the highest concentrations of Nb (16 000 ppm), Th (2800 ppm), and Zr (4000 ppm) found in the calcite–tetraferriphlogopite phoscorites, in which pyrochlore crystallization on the liquidus was identified. The rocks of the carbonatite series are strongly enriched in LREE relative to carbonaceous chondrite. The calcite–dolomite carbonatites of the late magmatic–carbothermal stage show REE enrichment up to 25 800 ppm. The chondrite-normalized REE patterns and (La/Yb)_N ratio indicate that REE were systematically more strongly fractionated in the sequence pyroxenite (70)—phoscorite (90)—calcite (540) and dolomite (3790) carbonatites The crystallization sequence of minerals in the rare-metal phoscorites and carbonatites of intermediate stages indicates that magnetite and pyrochlore crystallized nearly simultaneously. The crystallization temperatures of such associations are, according to data of the magnetite–ilmenite thermometer, lower than 500–600°C, at ∆NNO = –0.3 and + 1.5 and corresponded to the temperature at which the rare-metal ore mineralization of the main stage was formed.</p>","PeriodicalId":12781,"journal":{"name":"Geochemistry International","volume":"61 11","pages":"1128 - 1154"},"PeriodicalIF":0.8,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134796580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Erratum to: The Accumulation of the REE by Bacterial Fe Oxyhydroxide","authors":"S. Felitsyn,&nbsp;N. Alfimova,&nbsp;E. Bogomolov","doi":"10.1134/S0016702923210036","DOIUrl":"10.1134/S0016702923210036","url":null,"abstract":"","PeriodicalId":12781,"journal":{"name":"Geochemistry International","volume":"61 11","pages":"1219 - 1219"},"PeriodicalIF":0.8,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0016702923210036.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134795422","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On the Lithogeochemical Reconstruction of Possible “Geodynamic” Types of Granites-Sources of Arkose Clastic Material","authors":"A. V. Maslov,&nbsp;V. N. Podkovyrov","doi":"10.1134/S0016702923110071","DOIUrl":"10.1134/S0016702923110071","url":null,"abstract":"<div><div><p><b>Abstract</b>—A number of examples are considered in which modern arkose sands as well as arkose and compositionally similar sandstones (all of the above rocks are sediments of the first sedimentation cycle) of different ages have definite provenances composed of granitoids of different “geodynamic” types. The main goal of the work is to analyze how the geochemical characteristics of granitoids are translated into petrogenic sedimentary rocks. The comparison of 245 analyses of sands and sandstones with ~375 analyses of the inferred prototype sources of clastic material showed that the lithogeochemical characteristics of arkose and subarkose sands and sandstones (mainly the HFS element content and ratio) makes it possible in most cases to confidently judge the “geodynamic nature” of source felsic igneous rocks.</p></div></div>","PeriodicalId":12781,"journal":{"name":"Geochemistry International","volume":"61 11","pages":"1177 - 1195"},"PeriodicalIF":0.8,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134796581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}