Geochemistry International最新文献

{"title":"Trace Element Composition of Zircons from Rapakivi Granites of the Gubanov Intrusion, the Wiborg Massif, as a Reflection of the Fluid Saturation of the Melt","authors":"I. V. Rogova,&nbsp;V. S. Stativko,&nbsp;D. A. Petrov,&nbsp;S. G. Skublov","doi":"10.1134/S0016702924700630","DOIUrl":"10.1134/S0016702924700630","url":null,"abstract":"<p>SEM-EDS and SIMS in situ methods were used to study the trace element composition of zircon from rapakivi granites of the Wiborg massif: wiborgites of the second phase, trachytoid granites of the third phase, as well as aplitic granites from their contact zone. All three rock varieties are available for study in the building stone quarry of the Vozrozhdenie deposit (Karelian Isthmus), where the granites of the Gubanov intrusion are mined. Zircon composition from all rock types shows traces of active fluid impact. This impact is manifested both at the level of zircon internal structure (dark zones and areas on BSE-image) and in the contents of trace and rare-earth elements, which significantly increase in the altered zones that differ in the BSE color. The total REE content in the studied zircon reaches 9400 ppm. Zircon from granites of the third phase show an opposite slope of LREE and HREE distribution pattern, i.e., “bird wings” profile (Sm_N/La_N &lt; 1). In the discrimination diagrams, the majority of the analyzed spots falls into the field of hydrothermal zircon. It is possible to assume that a source of fluid that affected zircon in all types of granites was fluid-saturated melts that produced trachytoid granites of the third phase.</p>","PeriodicalId":12781,"journal":{"name":"Geochemistry International","volume":"62 11","pages":"1123 - 1136"},"PeriodicalIF":0.7,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142889984","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":"Application of ICP-MS for Clarification of the Elemental Composition of Geological Reference Materials and Certification of Candidate Reference Materials","authors":"I. V. Nikolaeva,&nbsp;S. V. Palesskiy,&nbsp;A. S. Shaibalova","doi":"10.1134/S0016702924700691","DOIUrl":"10.1134/S0016702924700691","url":null,"abstract":"<p>The contents of 25 elements were established in prospective reference materials, black shales SChS-1A and SLg-1A, using a developed analysis technique based on fusing samples with lithium metaborate and determining elements by external calibration with an internal standard on an ELEMENT high-resolution mass spectrometer. The passport characteristics of Russian reference materials of magmatic and sedimentary rocks SG-3, SGD-2A, ST-2A, SI-2, and BIL-1 and technical standards ZUK-1 and ZUA-1 have been clarified. New data of rare-earth elements were obtained for SI-2 and ZUA-1, which were missing during certification. Based on the inductively coupled mass-spectrometry analysis of standards SG-3 and SI-2 from 2005 to 2024, their applicability now has been confirmed. The new obtained ICP-MS results make it possible to expand the number of certified parameters of reference materials and clarify their results and can be used in analytical practice.</p>","PeriodicalId":12781,"journal":{"name":"Geochemistry International","volume":"62 11","pages":"1219 - 1226"},"PeriodicalIF":0.7,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142890440","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":"Geochemical Signature of Basalts of the MAR Rift Valley at 20°31′ N: Origin Conditions of the Anomalous Volcanic Center of Puy des Folles in the Axial Zone of the Mid-Atlantic Ridge","authors":"S. A. Silantyev,&nbsp;A. I. Buikin,&nbsp;A. A. Gurenko,&nbsp;A. V. Chugaev,&nbsp;V. V. Shabykova,&nbsp;A. R. Tskhovrebova,&nbsp;V. E. Beltenev,&nbsp;A. S. Bich","doi":"10.1134/S0016702924700629","DOIUrl":"10.1134/S0016702924700629","url":null,"abstract":"<p>The results of a study of chilled glasses sampled during the 45th cruise of the R/V <i>Professor Logachev</i> at the top of the submarine volcano Puy des Folles are presented. The Puy des Folles volcano is located in the axial part of the rift valley of the Mid-Atlantic Ridge (MAR) at 20°31′ N. Unlike typical volcanic axial highs which usually does not exceed several hundred meters the summit of the Puy des Folles volcano is located a depth of 1950 m and rises 1800 m above the bottom of the rift valley. The data on geochemistry and isotope composition of chilled glasses examined allow us to come to a number of conclusions that expanded existing ideas about magmatic and tectonic processes conducted in the rift valley of the slow spreading ridges. Chilled glasses sampled at the top of the Puy des Folles volcano are originated from a very depleted melt formed by partial melting of the DM reservoir. Puy des Folles volcano was formed as result of the activity of a long-lived magma chamber located below the rift valley axis. It is possible that, in addition to the DM reservoir, a mantle source enriched in incompatible elements may have participated in the formation of the parental melts for the studied chilled glasses. A weak geochemical signal of contamination of the parental melt with a hydrothermal component in chilled glasses was established. Signs of stagnation in the spreading of the oceanic crust in the rift valley segment studied in this work have been established.</p>","PeriodicalId":12781,"journal":{"name":"Geochemistry International","volume":"62 11","pages":"1111 - 1122"},"PeriodicalIF":0.7,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0016702924700629.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142890439","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":"Is a Consensus Possible between Geochemical and Geophysical Models of the Internal Structure of the Lunar Mantle?","authors":"O. L. Kuskov,&nbsp;E. V. Kronrod,&nbsp;Koji Matsumoto,&nbsp;V. Kronrod","doi":"10.1134/S0016702924700836","DOIUrl":"10.1134/S0016702924700836","url":null,"abstract":"<p>Significant inconsistencies persist between geophysical and geochemical groups of lunar composition models, as well as within each group. The primary issues are related to the assessment of the content of main petrogenic elements (Fe, Mg, Si), including refractory elements (Al, Ca). In this study, we examined the impact of the chemical composition and mineralogy of different compositional models on the seismic and density structure of the lunar interior in combination with phase equilibrium calculations. Two groups of new geophysical models containing 51–52 wt % SiO₂ are considered—conventionally Earth-like models with terrestrial Al₂O₃ content and Moon-like models with increased Al₂O₃ content, obtained on the basis of seismic and selenodesic constraints using a Markov chain Monte Carlo method, as well as the most popular geochemical models TWM (Taylor, 1982) and LPUM (Longhi, 2006) with ∼45–46 wt % SiO₂. For these geophysical and geochemical models, we explicitly calculated sound velocities and densities of mantle-phase assemblages for a range of proposed selenotherms and compared the results with high-quality Apollo seismic data (Garcia et al., 2019). Regardless of the abundance of refractory elements, we find very satisfactory agreement between the physical properties of our new geophysical models and the Apollo seismic data, confirming the enrichment of the lunar mantle in FeO (∼12 wt %) and SiO₂ (∼50 wt %) at depths from 50 to 500 km. This enrichment of SiO₂ corresponds to the predominance of pyroxenes, especially low-Ca orthopyroxene, over olivine. In contrast, sound velocities in silica-unsaturated, olivine-dominated compositions enriched (TWM) or depleted (LPUM) in FeO and Al₂O₃ are inconsistent with the Apollo lunar seismic data. The inferred compositions contain significantly more FeO and SiO₂ than the bulk silicate Earth, which poses problems associated with the formation of the Moon from a pyrolite mantle during a giant impact scenario.</p>","PeriodicalId":12781,"journal":{"name":"Geochemistry International","volume":"63 2","pages":"111 - 128"},"PeriodicalIF":0.7,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143778059","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":"Palaeo-Environmental Reconstruction of Pedogenic Calcretes in Sathankulam, Southern India: An Integrated Approach","authors":"Perumal Velmayil,&nbsp; Udayanapillai Alagaiah Venu","doi":"10.1134/S0016702924700812","DOIUrl":"10.1134/S0016702924700812","url":null,"abstract":"<p>Calcrete deposits are identified as intermediary layers between soil outcrops and either Proterozoic hard metamorphic granite or Tertiary calcareous sandstone basement rocks in the Sathankulam region of the Thoothukudi district, Tamilnadu, India. Field observations delineate various forms of calcrete, including gravel, chalky, laminated, massive, and nodular structures. Photomicrographs of calcrete thin sections reveal features such as calcified macrocystis, calcified fungal hyphae, calcified microtubules, peloidal structures, calloforms with clay clast rimmed by micritic calcite, sesquioxide preservation, and micritic calcite preservation in septarian nodules. X-ray diffraction analysis of calcrete profile samples indicates a prevalence of micritic calcite with limited occurrences of clay minerals such as sepiolite, palygorskite, and sap grains of quartz, feldspar, hornblende, biotite, and gypsum. Geochemical studies on two calcrete profiles highlight major elements like CaO, Al₂O₃, MgO, Fe₂O₃, and minor/trace elements such as Ba, Nb, Zr, Y, Sr, Rb, Ga, Zn, Ni, Cu, and Cr, along with rare earth elements/chondrite values of La, Ce, Pr, Nd, Sm, Gd, and Dy. Statistical analyses, including multiple correlations, principal component analysis, and cluster analysis, elucidate the inter-relationships and affinities among the source elements of the two profiles. Stable isotope studies of δ¹³C and δ¹⁸O, specifically employing the Hudson diagenetic plot, suggest that the calcrete profile samples reflect a reconstruction of paleo-diagenetic environmental conditions in a meteoric cement and continental freshwater limestone depositional environment. Additionally, stable isotope analysis plotted on Horbury and Qing (2004) plot indicates a weaker monsoonal climate and a meteoric diagenetic environment in the studied area.</p>","PeriodicalId":12781,"journal":{"name":"Geochemistry International","volume":"63 1","pages":"77 - 95"},"PeriodicalIF":0.7,"publicationDate":"2024-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143489439","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: Cryolite as a Reference Mineral of Rare Metal Mineralization: An Experimental Study","authors":"A. A. Rusak,&nbsp;T. I. Shchekina,&nbsp;N. G. Zinovieva,&nbsp;A. Y. Bychkov,&nbsp;O. A. Lukanin","doi":"10.1134/S0016702924190030","DOIUrl":"10.1134/S0016702924190030","url":null,"abstract":"","PeriodicalId":12781,"journal":{"name":"Geochemistry International","volume":"62 10","pages":"1108 - 1108"},"PeriodicalIF":0.7,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0016702924190030.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714277","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":"Trace Elements and Organic Carbon in Benthic Organisms and Bottom Sediments of the East-Siberian Sea","authors":"L. L. Demina,&nbsp;S. V. Galkin,&nbsp;A. S. Solomatina","doi":"10.1134/S0016702924700563","DOIUrl":"10.1134/S0016702924700563","url":null,"abstract":"<p>First data on the concentrations of a number of trace elements and carbon (organic and carbonate) in the components of the bottom ecosystem of the East Siberian Sea have been obtained. The distribution of a large group of trace elements (Sc, Ti, V, Cr, Mn, Co, Ni, Cu, Zn, As, Cd, Mo, Ag, Ba, Tl, Pb, Bi, Th and U) in mass taxa of benthic organisms, including bivalvia <i>Portlandia arctica</i>; crustacean Isopod (<i>Saduria sibirica, Saduria sabini),</i> echinoderms Ophiuroidea <i>Ophiocten sericeum,</i> and Holothuroidea <i>Myriotrochus rinkii,</i> was studied. The role of abiotic and biotic factors in the accumulation of chemical elements in benthic organisms was estimated. The lithological and geochemical characteristics of host bottom sediments, primarily, the organic carbon content and the grain-size composition, reflect the influence of abiotic factors. The biotic factor is responsible for the geochemical properties of trace elements, the level of organic carbon in organisms, and their feeding type. For the first time, a comparative assessment of the levels of organic carbon accumulation in mass taxa and host bottom sediments was made, and an important sedimentological function of detritophages and deposit feeders organisms was shown.</p>","PeriodicalId":12781,"journal":{"name":"Geochemistry International","volume":"62 10","pages":"1077 - 1095"},"PeriodicalIF":0.7,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714275","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":"Simultaneous Calculation of Chemical and Isotope Equilibria Using the GEOCHEQ_Isotope Software: Iron Isotopes","authors":"V. B. Polyakov,&nbsp;M. V. Mironenko,&nbsp;M. V. Alenina","doi":"10.1134/S0016702924700538","DOIUrl":"10.1134/S0016702924700538","url":null,"abstract":"<p>The <i>GEOCHEQ_Isotope</i> software package, previously developed to calculate chemical and isotopic equilibria of carbon and oxygen in hydrothermal and hydrogeochemical systems by minimizing Gibbs energy, was extended to the simultaneous calculation of isotopic effects of carbon, oxygen, and iron (the main objective of the study). As for carbon and oxygen, the β-factor formalism was used to develop algorithms and a database for the calculation of iron isotopic effects. According to the developed algorithm, the Gibbs energy <i>G</i>*(<i>P</i>, <i>T</i>) of formation of a rare isotopologue was calculated through the Gibbs energy of formation of the main isotopologue taking into account the value of the ⁵⁶Fe/⁵⁴Fe β-factor of this substance and the mass ratio of ⁵⁴Fe and ⁵⁶Fe isotopes. The approximation of ideal isotope mixture was used. The temperature dependence of the β-factor is unified in the form of a third-order polynomial by inverse even degrees of absolute temperature. Based on a critical analysis of currently available data on equilibrium isotopic factors obtained by different methods (elastic and inelastic γ-resonance scattering, isotope exchange experiments, and ab-initio calculations), the main result was obtained: for the first time, internally consistent database on iron β-factors of minerals and water complexes was developed. To develop the database, minerals and aqueous complexes for which the estimates of the equilibrium fractionation factors of iron isotopes obtained by different methods exist and consistent within the error of the methods have been identified: metallic iron (α-Fe), hematite, magnetite, siderite, pyrite, and the aqueous complexes <span>({text{Fe(III)(}}{{{text{H}}}_{{text{2}}}}{text{O)}}_{6}^{{3 + }})</span> and <span>({text{Fe(III)(}}{{{text{H}}}_{{text{2}}}}{text{O)}}_{6}^{{2 + }})</span>. The values of the iron β-factors for these minerals and aqueous complexes, accepted as reference ones, formed the “mainstay” of the developed database. Considering that the equilibrium isotopic shifts of iron between minerals and water complexes are estimated much more accurately within the framework of one method rather than the corresponding β-factors, the database was made consistent by linking the ln β values for minerals and water complexes to the reference ln β values. The application of the <i>GEOCHEQ_Isotope</i> software package to the closed carbonaceous hydrothermal system H₂O–CO₂–Fe₂O₃–FeO–CaO (<i>T</i> = 200°C, <i>P</i> = 16–50 bar) has shown the possibility of its use for the calculation of changes in mineral composition and isotopic effects on oxygen, carbon, and iron.</p>","PeriodicalId":12781,"journal":{"name":"Geochemistry International","volume":"62 10","pages":"1029 - 1056"},"PeriodicalIF":0.7,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0016702924700538.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714289","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":"Erratum to: Trace Element Composition of Discordant Zircon as a Reflection of the Fluid Regime of Paleoproterozoic Granulite Metamorphism (Khapchan Terrane, Anabar Shield)","authors":"S. G. Skublov,&nbsp;N. I. Gusev,&nbsp;L. I. Salimgaraeva,&nbsp;L. Yu. Romanova","doi":"10.1134/S0016702924190042","DOIUrl":"10.1134/S0016702924190042","url":null,"abstract":"","PeriodicalId":12781,"journal":{"name":"Geochemistry International","volume":"62 10","pages":"1109 - 1109"},"PeriodicalIF":0.7,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0016702924190042.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714442","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":"Erratum to: Dissolution of Ta–Nb and Nb Minerals in Granitoid Melts","authors":"V. Yu. Chevychelov,&nbsp;A. A. Viryus","doi":"10.1134/S0016702924190029","DOIUrl":"10.1134/S0016702924190029","url":null,"abstract":"","PeriodicalId":12781,"journal":{"name":"Geochemistry International","volume":"62 10","pages":"1107 - 1107"},"PeriodicalIF":0.7,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0016702924190029.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142714443","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}