Geochemistry International最新文献_第9页

Partition of Trace Elements between Minerals and Melt: Parameterization of Experimental Data on Olivine, Pyroxene, and Feldspars 微量元素在矿物和熔体之间的分配：橄榄石、辉石和长石实验数据的参数化

IF 0.7 4区地球科学

Geochemistry International Pub Date : 2024-04-03 DOI: 10.1134/S0016702924030030

A. V. Girnis

{"title":"Partition of Trace Elements between Minerals and Melt: Parameterization of Experimental Data on Olivine, Pyroxene, and Feldspars","authors":"A. V. Girnis","doi":"10.1134/S0016702924030030","DOIUrl":"10.1134/S0016702924030030","url":null,"abstract":"The partition of trace elements between minerals (olivine, orthopyroxene, clinopyroxene, and feldspars) and silicate melts is analyzed based on experimental data within broad P–T ranges (from 1 atm to 10 GPa and ∼1000–2000°C) and the compositions of melts (from ultramafic to ultrasilicic) and minerals. The dependences of the logarithmic partition coefficients (lnDi) on P–T parameters and compositions are approximated by linear functions of 1/T, P/T (where P is pressure and T is temperature in K) and compositional parameters of the minerals and melts. The Di/Dj ratios of a large number of pairs of elements are found out to be independent of experimental parameters and vary within narrow ranges. The parameters of the dependences of Di on P–T and compositions are estimated by minimizing the squared deviations of model Di and Di/Dj values from experimental ones. The dependences thus derived make it possible to calculate Di for numerous elements accurate to a factor of 1.2–2.0. As an illustrative example, a model is discussed for the derivation of mafic basaltic melts in mid-oceanic ridges at the melting of a peridotite source and crystallization of primary magmas under crustal parameters.","PeriodicalId":12781,"journal":{"name":"Geochemistry International","volume":"62 3","pages":"221 - 233"},"PeriodicalIF":0.7,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140567855","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}

引用次数: 0

Experimental Study of the ({text{Mo}}{{{text{O}}}_{{text{2}}}}{text{Cl}}_{{2left( {{text{aq}}} right)}}^{^circ }) Stability in Hydrothermal Solutions at 100–350°C and Saturated Vapor Pressure $${text{Mo}}{{text{O}}}_{{text{2}}}}{text{Cl}}_{{2left( {{text{aq}}} right)}}^{^circ }$ 在 100-350°C 和饱和蒸汽压下的水热解稳定性的实验研究

IF 0.7 4区地球科学

Geochemistry International Pub Date : 2024-04-03 DOI: 10.1134/S0016702924030066

A. A. Yakimenko, A. Yu. Bychkov

引用次数: 0

Atacamite from the Paleofumaroles of Mount 1004, Tolbachik Volcano, Kamchatka: Thermodynamic Properties 堪察加托尔巴奇克火山 1004 山古风孔中的 Atacamite：热力学性质

IF 0.7 4区地球科学

Geochemistry International Pub Date : 2024-04-03 DOI: 10.1134/S001670292402006X

Yu. D. Gritsenko, M. O. Bulakh, L. P. Ogorodova, M. F. Vigasina, L. V. Melchakova, D. A. Ksenofontov

引用次数: 0

Variability of the Chemical Composition of Pine Forest Components in the Forest-Steppe of the Chelyabinsk Region under the Influence of Anthropogenic Load 人为负荷影响下车里雅宾斯克州森林草原松林成分化学成分的变异性

IF 0.7 4区地球科学

Geochemistry International Pub Date : 2024-04-03 DOI: 10.1134/S0016702924020083

N. V. Terekhina, A. D. Glinskikh

{"title":"Variability of the Chemical Composition of Pine Forest Components in the Forest-Steppe of the Chelyabinsk Region under the Influence of Anthropogenic Load","authors":"N. V. Terekhina, A. D. Glinskikh","doi":"10.1134/S0016702924020083","DOIUrl":"10.1134/S0016702924020083","url":null,"abstract":"<div>The work provides a comprehensive assessment of changes in the intensity of pollution of soils and plants of pine forests with increasing distance from the main sources of pollution. Within the forest-steppe zone of the Chelyabinsk region, zones of environmental tension have been identified based on the summary index of soil contamination with mobile forms of chemical elements and on the level of pine bark contamination. The main polluting elements were Cr, Pb, Zn, Cd, the content of which in soils was tens of times higher than the background values. The same pollutants and Cu were noted for pine bark, but their concentrations were significantly lower and exceeded the background only several times. High values of correlation coefficients between pollution indicators for soils and bark were noted for Pb, Cu, Zn and the summary indices of contamination. The content of most of the studied chemical elements in pine needles does not exceed background values, but the Al and Ni content in some plots near industrial enterprises can be 2–4 times higher than background values.</div>","PeriodicalId":12781,"journal":{"name":"Geochemistry International","volume":"62 2","pages":"208 - 219"},"PeriodicalIF":0.7,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140567860","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}

引用次数: 0

Estimated Age and Metamorphic Parameters of High-Pressure Blastolites in the Gonzhinskii Block, Argun Superterrane, Eastern Part of the Central Asian Orogenic Belt 中亚造山带东部阿尔贡超大陆冈仁斯基区块高压爆破岩的估计年龄和变质参数

IF 0.7 4区地球科学

Geochemistry International Pub Date : 2024-04-03 DOI: 10.1134/S0016702924020058

M. M. Fugzan, T. I. Kirnozova, V. M. Kozlovskii, R. O. Ovchinnikov, I. K. Kozakov

{"title":"Estimated Age and Metamorphic Parameters of High-Pressure Blastolites in the Gonzhinskii Block, Argun Superterrane, Eastern Part of the Central Asian Orogenic Belt","authors":"M. M. Fugzan, T. I. Kirnozova, V. M. Kozlovskii, R. O. Ovchinnikov, I. K. Kozakov","doi":"10.1134/S0016702924020058","DOIUrl":"10.1134/S0016702924020058","url":null,"abstract":"Petrographic and thermobarometric data obtained on a blastolite lens hosted in sheared rocks of the Gonzhinskii block indicate that the lens contains four mineral assemblages: relict, main, an assemblage corresponding to biotitization, and that of retrograde alterations. The relict assemblage was likely eclogitic. The main mineral assemblage corresponds to zoisite amphibolite developing after eclogite. The P−T metamorphic parameters of this assemblage are P = 13.0−15.0 kbar and T = 580−670°C. However, if the calculations are done using the iron richest outer rim of amphibole 1, the P−T parameters are P = 13.0−17.0 kbar and T = 660−780°C. The mineral assemblage corresponding to the overprinted biotitization is clearly distinct texturally. The lines of the monomineral equilibria of the biotite assemblage plotted using various combinations of the composition of the garnet, biotite, and plagioclase well converge within a compact field of P = 12.5−13.2 kbar and T = 810−830°C. The latest assemblage of retrograde minerals includes low-Al amphibole 2. Our original Sm−Nd isotope date were used to calculate an isochron for a whole-rock sample, garnet, and two amphiboles. The isochron age of the rock is 171 ± 3 Ma and is interpreted as the age of the main mineral assemblage, i.e., its crystallization at the metamorphic peak.","PeriodicalId":12781,"journal":{"name":"Geochemistry International","volume":"62 3","pages":"234 - 244"},"PeriodicalIF":0.7,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140567874","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}

引用次数: 0

Quartz Diorites of the Volkovsky Ore-Bearing Massif (Middle Urals, Russia): U–Pb Age, Nd–Sr–Pb Isotope Systematics, Geochemical Features, Petrogenetic, and Geodynamic Consequences 沃尔科夫斯基含矿地块（俄罗斯乌拉尔中部）的石英闪长岩：U-Pb年龄、钕-锶-铅同位素系统学、地球化学特征、岩石学和地球动力学后果

IF 0.7 4区地球科学

Geochemistry International Pub Date : 2024-04-03 DOI: 10.1134/S0016702924020022

E. V. Anikina, N. M. Kudryashov, N. G. Soloshenko, I. A. Rusin, M. V. Chervyakovskaya

{"title":"Quartz Diorites of the Volkovsky Ore-Bearing Massif (Middle Urals, Russia): U–Pb Age, Nd–Sr–Pb Isotope Systematics, Geochemical Features, Petrogenetic, and Geodynamic Consequences","authors":"E. V. Anikina, N. M. Kudryashov, N. G. Soloshenko, I. A. Rusin, M. V. Chervyakovskaya","doi":"10.1134/S0016702924020022","DOIUrl":"10.1134/S0016702924020022","url":null,"abstract":"<div>The paper reports the results of U–Pb dating, Nd–Sr–Pb isotope systematics, and geochemical study of quartz diorites associated with ore-bearing (Cu–Pd–Au–Ag) gabbro of the Volkovsky massif, which is localized within the Urals Platinum Belt, at its eastern border with the Silurian–Devonian volcanogenic complexes of the Tagil megazone. The age of the quartz diorites according to U–Pb (TIMS) dating is 429 ± 9 Ma, MSWD = 0.009. Sr–Nd–Pb isotope characteristics (εNd(T) = +5.5…+6.7; (87Sr/86Sr)t = 0.70382–0.70392; 206Pb/204Pb = 18.38–18.57; 207Pb/204Pb = 15.56–15.58; 208Pb/204Pb = 38.14–38.30) indicate a juvenile source with a model age of 570–760 Ma. The obtained data fall within values typical of basalts of ensimatic island arcs. The geochemical features of the granitoids of the Volkovsky massif (low REE concentration, differentiated REE pattern (La/Yb = 8–14) with a weak positive Eu anomaly (Eu/Eu* = 0.9–1.4)) are consistent with the characteristics of melts obtained in experiments on hydrous melting of mafic rocks in equilibrium with amphibole–pyroxene residue. The anomalous concentration of strontium (more than 1000 ppm) in the quartz diorites is due to the high content of this element in a source. Such source could be the oldest rocks of the Urals Platinum Belt—olivine gabbro and metamorphic rocks of their surroundings. The identical ages of the quartz diorites of the Volkovsky massif and monzonitoids of the Kushvinsky massif allow us to consider these rocks as the result of the almost simultaneous mantle and crust melting at the final stage of the formation of the Tagil island-arc system.</div>","PeriodicalId":12781,"journal":{"name":"Geochemistry International","volume":"62 2","pages":"155 - 171"},"PeriodicalIF":0.7,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140567858","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}

引用次数: 0

Major, Volatile, Ore, and Trace Elements in Magmatic Melts in the Earth’s Dominant Geodynamic Settings. II. Similarities and Differences 地球主要地球动力环境中岩浆熔体中的主要元素、挥发性元素、矿石元素和微量元素。II.异同

IF 0.7 4区地球科学

Geochemistry International Pub Date : 2024-04-01 DOI: 10.1134/S0016702924010075

V. B. Naumov, A. V. Girnis, V. A. Dorofeeva

{"title":"Major, Volatile, Ore, and Trace Elements in Magmatic Melts in the Earth’s Dominant Geodynamic Settings. II. Similarities and Differences","authors":"V. B. Naumov, A. V. Girnis, V. A. Dorofeeva","doi":"10.1134/S0016702924010075","DOIUrl":"10.1134/S0016702924010075","url":null,"abstract":"Based on the mean contents of elements and their standard deviations estimated in the first part of this contribution (Naumov et al., 2023), we compared in detail the geodynamic settings distinguished earlier. In order to compare the compositions of mafic melts, a correction was introduced for changes related to the fractionation of the main minerals. Using numerical criteria, the elements were arranged in a sequence of the increasing degree of compatibility during melting and crystallization, and regular variations in element contents normalized to the mean composition of oceanic-island melts were distinguished. The melts of mid-oceanic ridges show a monotonous increase in normalized contents from the most incompatible (Cs, Ba, U, La, etc.) to compatible elements (Sc, Ni, and Cr). The settings of convergent plate boundaries show relative enrichment in the most incompatible elements and significant negative Ta−Nb anomalies relative to neighboring elements. The magmas of continental rifts show the most significant enrichment in the most incompatible elements, as well as Pb, Li, and some other elements. Indicator element ratios showing significant variations between the settings were distinguished for mafic melts. Some element ratios are almost identical (within observed variations) in mafic melts from all the settings. The mean element ratios in mafic, intermediate, and silicic magmas show three types of behavior. Some ratios (including the canonic ratios Nb/Ta, Zr/Hf, etc.) in intermediate and silicic magmas are inherited from the composition of mafic melts. Some ratios show irregular changes from mafic to silicic melts (Sr/Cr, F/Th, etc.). Some other ratios change monotonously and significantly in the sequence from mafic to silicic melts (Ni/Yb, Lu/P, etc.). The variations in element ratios are related to the crystallization differentiation of melts and contributions of geochemically contrasting reservoirs.","PeriodicalId":12781,"journal":{"name":"Geochemistry International","volume":"62 1","pages":"18 - 31"},"PeriodicalIF":0.7,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140524970","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}

引用次数: 0

High-Precision Determination of Carbon Isotope Composition and Concentration of Dissolved Inorganic Carbon in Seawater 高精度测定海水中的碳同位素组成和溶解无机碳浓度

IF 0.7 4区地球科学

Geochemistry International Pub Date : 2024-04-01 DOI: 10.1134/S0016702924010038

E. O. Dubinina, S. A. Kossova, Yu. N. Chizhova

{"title":"High-Precision Determination of Carbon Isotope Composition and Concentration of Dissolved Inorganic Carbon in Seawater","authors":"E. O. Dubinina, S. A. Kossova, Yu. N. Chizhova","doi":"10.1134/S0016702924010038","DOIUrl":"10.1134/S0016702924010038","url":null,"abstract":"Determination of the isotopic composition and concentration of dissolved inorganic carbon (DIC) in sea water requires not only high measurement accuracy, but also the development of unified approaches to data standardization and material collection. In this work, we studied the effect of sampling methods (“into containers” and “into vials with acid”) with and without the addition of a toxin) on the results of determining the values of δ13С(DIC) and the concentration of DIC in sea water. The analytical protocol is described in detail, based on many years of experience in the sample collection, measurement and standardization of data obtained for a large number of water samples of the Arctic seas. According to the above protocol, the values of δ13С(DIC) and [DIC] can be determined with an error of less than 0.05‰ (1σ) and 4.5 rel % respectively. It has been shown that sampling “in a vial with acid” with their storage for 4 months is accompanied by significant contamination by atmospheric carbon dioxide with an underestimation of δ13С(DIC) values by an average of 0.3–0.8‰ and an overestimation of [DIC] values by an average of two times. The absence of a toxin that stops biological activity does not lead to significant shifts in the DIC concentration, but it strongly affects the δ13С(DIC) values, which become underestimated by an average of 1‰. Using sampling “in a container” and toxin addition, along with following other recommendations, the samples retain the isotope and concentration parameters of DIC throughout the year.","PeriodicalId":12781,"journal":{"name":"Geochemistry International","volume":"62 1","pages":"45 - 54"},"PeriodicalIF":0.7,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140516309","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}

引用次数: 0

Oceanic Crust Formation within the Andrew Bain Fault Zone, Southwest Indian Ridge: Petrological and Geochemical Evidence 西南印度洋脊安德鲁-贝恩断裂带内的洋壳形成：岩石学和地球化学证据

IF 0.7 4区地球科学

Geochemistry International Pub Date : 2024-04-01 DOI: 10.1134/S0016702924010026

N. M. Sushchevskya, V. D. Scherbakov, A. A. Peyve, E. P. Dubinin, B. V. Belyatsky, A.V. Zhilkina

{"title":"Oceanic Crust Formation within the Andrew Bain Fault Zone, Southwest Indian Ridge: Petrological and Geochemical Evidence","authors":"N. M. Sushchevskya, V. D. Scherbakov, A. A. Peyve, E. P. Dubinin, B. V. Belyatsky, A.V. Zhilkina","doi":"10.1134/S0016702924010026","DOIUrl":"10.1134/S0016702924010026","url":null,"abstract":"<div>Petrogeochemical data on basalts (lithophile elements and Sr–Nd–Pb isotopes, liquidus olivine and spinel compositions) from the transition zone of the Southwest Indian Ridge (SWIR) in the Du Toit–Andrew Bain fault zone indicate significant differences in their composition. Tholeiites enriched in Na and depleted in Fe (Na-TOR genetic type) are developed within the rift valley adjacent to the faults. Deep-type basalts (TOR-1) are present in the western wall of the Andrew Bain Fault. The outpouring of these magma types reflects a possible change in geodynamic setting during formation of this zone: from deep and high temperature to shallower magma generation conditions (Sushchevskaya et al., 2022). Differences in the primary melts of tholeiites from the rift valley and the Andrew Bain Transform Fault are also traced in the composition of liquidus olivine. The olivines from rift valley are similar to the typical Na-TOR olivines with Mg number of Fo88-87, low Ni and elevated Mn contents. On the contrary, olivines in tholeiite from the Andrew Bain Fault Zone are enriched in Ni and depleted in Mn, which may indicate the involvement of pyroxenite in melt generation. This component is either oceanic lithosphere recycled through the deep mantle or fragments of previously formed oceanic crust, which were subsequently involved in melting during the spreading axes jumping. A similar process is typical of the Bouvet Triple Junction, where the trace-element composition of olivine shows significant heterogeneity. The radiogenic composition of Pb and Sr of the Andrew Bain Fault tholeiites are similar to those of enriched magmas from such Indian Ocean rises as Crozet, Marion and Bouvet, but differ from those of the Conrad and Af. Nikitin rises. The source of such tholeiite melts is close in composition to the model HIMU type (with high U/Pb), which likely contains an admixture of EM-II component (with elevated Rb/Sr).</div>","PeriodicalId":12781,"journal":{"name":"Geochemistry International","volume":"62 1","pages":"1 - 17"},"PeriodicalIF":0.7,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140525887","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}

引用次数: 0

Geochemical Features of the Talus–Lacustrine Sedimentogenesis in the Chistoye Lake Basin, Northern Okhotsk Region 北鄂霍次克地区奇斯托耶湖盆地距冰-湖积沉积作用的地球化学特征

IF 0.7 4区地球科学

Geochemistry International Pub Date : 2024-04-01 DOI: 10.1134/S0016702924010051

P. S. Minyuk, D. K. Pozhidaeva, O. T. Sotskaya, S. S. Burnatny

{"title":"Geochemical Features of the Talus–Lacustrine Sedimentogenesis in the Chistoye Lake Basin, Northern Okhotsk Region","authors":"P. S. Minyuk, D. K. Pozhidaeva, O. T. Sotskaya, S. S. Burnatny","doi":"10.1134/S0016702924010051","DOIUrl":"10.1134/S0016702924010051","url":null,"abstract":"<div>The results of the geochemical study of loose sediments of the catchment basin and bottom sediments of Lake Chistoye located in the Northern Okhotsk region showed that the lake was formed at the beginning of the Early Holocene about 11200 cal. years BP. It is dominated by terrigenous sedimentation, i.e. the geochemical characteristics of sediments are controlled by the grain size. Fine-grained sediments have low SiO2, Na2O, K2O, CaO, Sr contents and are enriched in Al2O3, TiO2, MgO, Fe2O3, and V. Changes in the sedimentation nature are likely caused by climatic reasons and may be associated with the cold Bond events. In the Early Holocene, mostly thin silts were deposit in Lake Chistoye. The pulses of “coarse-grained” sediments (>140 μm) enriched with silica occurred (9760–9650) and 8810 cal years BP. Relatively coarse-grained sediments were mainly accumulated at the very beginning of the Middle Holocene 8540–6920 cal years BP, as well as 6140 and 4450 cal years BP. In the Late Holocene, the input of detrital material with increased SiO2 contents was noted in the range of 3470–850 cal. years BP.</div>","PeriodicalId":12781,"journal":{"name":"Geochemistry International","volume":"62 1","pages":"79 - 98"},"PeriodicalIF":0.7,"publicationDate":"2024-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140516719","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}

引用次数: 0