Petrology最新文献

{"title":"Nd Isotopic Composition of the Continental Crustal Rocks and Its Relations with Geological Structures of the Southern Surroundings of the Mongol–Okhotsk Foldbelt","authors":"V. V. Yarmolyuk,&nbsp;A. M. Kozlovsky,&nbsp;D. V. Kovalenko,&nbsp;V. M. Savatenkov","doi":"10.1134/S0869591126700438","DOIUrl":"10.1134/S0869591126700438","url":null,"abstract":"<p>The continental crust along the southern edge of the Mongol–Okhotsk Foldbelt (MOFB) has been zoned according to the Nd isotopic composition of the magmatic rocks. Three terranes have been identified: Middle Gobi, Erendaba, and Idermeg. These terranes differ in the Nd isotopic composition of the granitoids and felsic volcanics and in their geological histories. The Middle Gobi terrane has a Precambrian basement and Mesoproterozoic isotopic model ages of its igneous rocks (T_Nd(DM-2st) &gt; 1 Ga). The Erendaba terrane formed in the Early Paleozoic, incorporating recycled material with Mesoproterozoic isotopic signatures. The rocks of the Idermeg terrane possess predominantly Neoproterozoic isotopic characteristics [T_Nd(DM-2st) &lt; 1 Ga]. The Mongol–Okhotsk Foldbelt formed via the accretion of these terranes to the Siberian continent at different time. The Middle Gobi terrane collided with Siberia at the beginning of the Triassic, forming the Khentei segment of the MOFB. The composite Erendaba–Idermeg terrane accreted to Siberia in the Middle Jurassic, completing the formation of the Jargantu segment of the MOFB. It can therefore be concluded that the Mongol–Okhotsk basin was a large embayment of the Paleo-Asian Ocean.</p>","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"34 5","pages":"630 - 642"},"PeriodicalIF":1.0,"publicationDate":"2026-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098598","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":"Age, Composition, and Formation Mechanisms of the Bural Alkaline Granitoid Complex, Eastern Sayan Rare-Metal Province, with Reference to the Problem of Rare-Metal Magma Generation","authors":"V. V. Yarmolyuk,&nbsp;D. A. Lykhin,&nbsp;A. M. Kozlovsky,&nbsp;A. V. Nikiforov","doi":"10.1134/S086959112670044X","DOIUrl":"10.1134/S086959112670044X","url":null,"abstract":"<p>The Bural alkaline granitoid complex is located in the southwestern part of the Eastern Sayan rare-metal province and makes up a compact field of dike and stock-shaped bodies of alkaline syenites, granites, and leucogranites with subordinate gabbromonzonites. The age of the rocks is estimated at 301 ± 4 Ma, which is close to the age of other alkaline granitoids in the region, including the Ulug-Tanzek and Ulan-Tologoy rare-metal deposits. The Bural complex comprises two groups of alkali-salic rocks, differing in contents of trace elements, primarily REE. The first group includes rocks whose REE contents exceeding 185 ppm. They compose a differentiated series enriched of REE, Nb, Ta, Zr, Th, and U in the final silicic (alkaline-granite) derivatives, formed as a result of fractionation of mafic melts. The other group includes leucogranites and syenites “depleted” in REE. The leucogranites correspond to eutectic melts and have features typical of rare-metal magmas of the metaluminous series: strongly reduced REE contents (&lt;35 ppm) at relatively high concentrations of Rb, Cs, Ta, and Nb. The associated “depleted” syenites have higher contents of incompatible elements and resulted from interaction between leucogranite melts and melts of the differentiated series. A model proposed to explain the origin of the Bural complex assigns a leading role in the development of magmatic system to differentiated subalkaline mafic melts. On the one hand, they triggered the anatectic melting of the crust leading to the formation of metaluminous rocks, and on the other, they differentiated to alkali-salic melts enriched in rare elements.</p>","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"34 5","pages":"557 - 572"},"PeriodicalIF":1.0,"publicationDate":"2026-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098597","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":"Influence of Crystal Fractionation and Fluid Regime Change on the Evolution of Magmas of the Wangtian’e Bimodal Volcanic Association (Northeastern China)","authors":"O. A. Andreeva,&nbsp;V. M. Savatenkov,&nbsp;I. A. Andreeva,&nbsp;A. I. Usoltseva,&nbsp;J.-Q. Ji,&nbsp;J. Zhou","doi":"10.1134/S0869591126700426","DOIUrl":"10.1134/S0869591126700426","url":null,"abstract":"&lt;p&gt;To reconstruct the magmatic evolution of the bimodal association of Wangtian’e Volcano in the Changbaishan area (Northeastern China), we used a comprehensive petrological and geochemical approach. This approach included the study of the chemical composition of volcanic rocks, determination of their isotopic (Sr–Nd) composition, detailed investigation of melt and fluid inclusions in phenocrysts of the entire volcanic rock series, and thermodynamic modeling of melt fractionation and assimilation processes using the alphaMELTS program. The study of melt inclusions in minerals of the tholeiitic basalts and trachytes of the volcano showed that the basaltic melts crystallized at &lt;i&gt;T&lt;/i&gt; = 1180–1200°C, whereas the trachytic melts of trachyte extrusions and trachyte lava flows crystallized at 1050–1060°C and 1070–1090°C, respectively. Based on the study of primary CO&lt;sub&gt;2&lt;/sub&gt; fluid inclusions in plagioclase of the basalts, the crystallization pressure was estimated as &lt;i&gt;P&lt;/i&gt; = 0.1 ± 0.01 GPa, which corresponds to a depth of ~4 km. The analysis of the compositions of rocks and melt inclusions in minerals and their comparison with the results of thermodynamic modeling of assimilation–fractional crystallization allowed us to demonstrate the leading role of fractional crystallization of magmas in the formation of the entire rock series from basalt to trachyte and an insignificant contribution of crustal contamination (&lt;i&gt;Ma/Mc&lt;/i&gt; = 15%). Magma fractionation at Wangtian’e Volcano occurred in two stages. The first stage of crystal fractionation of tholeiitic melts followed the Fenner trend, when FeO, TiO&lt;sub&gt;2&lt;/sub&gt;, and P&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;5&lt;/sub&gt; accumulated in the melts at a minor increase in SiO&lt;sub&gt;2&lt;/sub&gt; content. The fractional crystallization of tholeiitic magmas occurred at CO&lt;sub&gt;2&lt;/sub&gt; dominance over H&lt;sub&gt;2&lt;/sub&gt;O in the fluid and was accompanied by extensive degassing of CO&lt;sub&gt;2&lt;/sub&gt; (up to 97.5–99%) and partial (up to 50%) H&lt;sub&gt;2&lt;/sub&gt;O loss. The second stage of crystallization differentiation followed the Bowen trend and involved a change in the fluid regime: the dominant role of CO&lt;sub&gt;2&lt;/sub&gt; gave way to the predominance of H&lt;sub&gt;2&lt;/sub&gt;O in both the fluid phase and the melt. The transition to the Bowen trend of melt differentiation occurred when FeO contents reached 15–20 wt % and titanomagnetite crystallization began. The change in the crystal fractionation trend from the Fenner to Bowen type was associated with a change in the fluid regime of the magmatic system: water accumulation in the melt promoted FeO oxidation to the ferric state and subsequent Fe&lt;sub&gt;3&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt; crystallization. The fluid regime also played an important role in the formation of the bimodal distribution of rock compositions at Wangtian’e Volcano. Highly mobile mafic magmas with a predominance of CO&lt;sub&gt;2&lt;/sub&gt; over H&lt;sub&gt;2&lt;/sub&gt;O in the fluid and trachytic magmas whose viscosity was reduced by melt enrichment in water and alkalis erupted on the s","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"34 5","pages":"589 - 607"},"PeriodicalIF":1.0,"publicationDate":"2026-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098582","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":"Composition and Evolution of Topaz Rhyolite Magmas of the Spor Mountain Formation, USA: A Study of Melt Inclusions in Minerals","authors":"I. A. Andreeva,&nbsp;D. A. Lykhin,&nbsp;S. E. Borisovskiy,&nbsp;E. V. Kovalchuk","doi":"10.1134/S0869591126700414","DOIUrl":"10.1134/S0869591126700414","url":null,"abstract":"&lt;p&gt;Using various methods of melt inclusion investigation, including electron and ion microprobe analysis, we estimated the composition and evolution of topaz rhyolite magmas of the Spor Mountain Formation (USA). Primary melt inclusions were found in quartz from the topaz rhyolite. Based on their phase composition, two types of melt inclusions were distinguished: (1) glassy and (2) partly or completely crystallized. The daughter minerals of the crystallized inclusions are albite, sanidine, fluorite, and fluorine-rich (up to 7 wt %) Li-annite. Heating experiments with second-type melt inclusions revealed high temperatures of their partial homogenization (to glass + gas) ranging from 1040 to 1100°C. The analysis of glasses of the homogenized melt inclusions in quartz from the topaz rhyolites distinguished two groups of melts. Melts of the first group are rhyolitic in composition and have high SiO&lt;sub&gt;2&lt;/sub&gt; and Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; contents: 73–75 and 12–13 wt % respectively; their Na&lt;sub&gt;2&lt;/sub&gt;O content is 4.8–5.8 wt %. The H&lt;sub&gt;2&lt;/sub&gt;O content varies from 0.7 to 1.9 wt %. The melts of the second group correspond to the trachydacite composition. Compared with the melts of the first group, they are depleted in SiO&lt;sub&gt;2&lt;/sub&gt; (67–69 wt %) and enriched in Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; (16.5–18.8 wt %) and Na&lt;sub&gt;2&lt;/sub&gt;O (6.8–7.6 wt %). Their H&lt;sub&gt;2&lt;/sub&gt;O content does not exceed 0.1–0.3 wt %. The F and Cl contents of the melts of both groups are 0.7–1.8 and 0.20–0.37 wt %, respectively. The analysis of trace elements in the glasses of homogenized melt inclusions of both groups showed high contents of Be, B, Li, Nb, Ta, Th, U, Rb, Y, and LREE. In addition to silicate glass, an unusual fluoride phase was found within the glassy (unheated) melt inclusions of the first type. This phase shows high contents (wt %) of F (34.93), Al&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; (34.43), and Na&lt;sub&gt;2&lt;/sub&gt;O (35.20) at 14.87 wt % SiO&lt;sub&gt;2&lt;/sub&gt; and 3.44 wt % K&lt;sub&gt;2&lt;/sub&gt;O, which allowed us to suppose that a specific sodium aluminofluoride melt separated from magma enriched in alumina, alkalis, and fluorine. The data obtained from the study of melt inclusions in quartz from the Spor Mountain topaz rhyolite provided insight into the evolution of the rhyolite melt during rock formation. It was shown that quartz crystallized from an eutectic melt enriched in Be, B, Li, Nb, Ta, Th, U, Rb, and Y with elevated F (up to 1.8 wt %) and H&lt;sub&gt;2&lt;/sub&gt;O contents (0.7–1.9 wt %). The injection of basaltic melt into a silicic magma initiated intense degassing and led to the melting of the mineral association that had crystallized by the time of the injection. During this process, fluorine-containing phases, such as fluorite, topaz, and F-annite, were melted. The residual melt became significantly enriched in fluorine and trace elements, leading to the separation of a specific aluminofluoride liquid. The further evolution path of the silicate melt included the fractional crystallizati","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"34 5","pages":"573 - 588"},"PeriodicalIF":1.0,"publicationDate":"2026-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098581","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":"Outstanding Russian Geologist, 90th Anniversary of the Birth of V.I. Kovalenko","authors":"Editorial Board","doi":"10.1134/S0869591126700475","DOIUrl":"10.1134/S0869591126700475","url":null,"abstract":"","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"34 5","pages":"529 - 530"},"PeriodicalIF":1.0,"publicationDate":"2026-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098583","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":"Composition and Sources of Volcanic Rocks of the Dariganga Plateau: An Assessment of the Formation Mechanisms of the Late Cenozoic Intraplate Volcanic Province of Central and East Asia","authors":"V. M. Savatenkov,&nbsp;V. V. Yarmolyuk,&nbsp;A. M. Kozlovsky,&nbsp;L. V. Shpakovich","doi":"10.1134/S0869591126700463","DOIUrl":"10.1134/S0869591126700463","url":null,"abstract":"<p>New data are presented on the petrochemical, geochemical, and isotopic (Sr, Nd, and Pb) characteristics of volcanic rocks of the Dariganga Plateau, which is one of the largest volcanic fields in the Late Cenozoic volcanic province of Central and East Asia. Regular trends were observed in the composition of volcanic rocks versus time indicating cyclic changes in the chemistry of magma sources and conditions of melt generation during the formation of the Dariganga Plateau. During the early cycle, which included the middle Miocene and the late Miocene–early Pliocene stages, the metasomatically altered lithospheric mantle contributed significantly to magma formation. The magmatism of the late cycle was dominated by an asthenospheric (plume) source. Regional correlations confirmed a similar pattern of development in other volcanic areas of the province. The identified similarity indicates that the magmatic activity within the province was controlled by a single regulator; according to geophysical data, it was the Hangai plume. The sporadic occurrence of volcanism in various areas of the province reflects the pulsed activity of the mantle plume, and the absence of a strict correlation between the timing of eruptions and the scale of their productivity indicates a certain inertia in the propagation of the mantle signal from the source of activity to the periphery.</p>","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"34 5","pages":"608 - 629"},"PeriodicalIF":1.0,"publicationDate":"2026-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098584","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":"Formation of the Zashikhinsky Rare-Metal Deposit, Russia, by the Filtration Differentiation of Alkali Granite Melt","authors":"A. V. Nikiforov,&nbsp;D. A. Lykhin,&nbsp;N. V. Alymova,&nbsp;O. A. Andreeva,&nbsp;A. Yu. Bychkov,&nbsp;A. A. Vorontsov","doi":"10.1134/S0869591126700451","DOIUrl":"10.1134/S0869591126700451","url":null,"abstract":"<p>A model proposed for the formation of the Zashikhinsky Nb–Ta, Zr, and REE deposit is based on the results of geological, petrographic, and mineralogical–geochemical studies of rocks of the massif and ores hosted in it. Data are presented on the zonal structure of the massif and the distribution of ore minerals in the vertical section of the massif and between distinct zones identified in it. The behavior of ore components in the ore-forming process is elucidated. According to the proposed model, the deposit was formed by the interplay of two processes: (1) the in-chamber filtration differentiation of leucogranite melt, which was initially enriched in F, other volatile components (H₂O, P₂O₅, CO₂, and S), and trace elements: Nb–Ta, Zr, (Y + REE), U, Th, Pb, and Sn [Nb &gt; 300 ppm, Zr &gt; 300 ppm, (Y + REE) &gt; 110]; and (2) autometasomatic alteration of the rocks under the effect of residual intergranular melt–aqueous solution without any significant input of material from the outside. This process operated during all evolutionary stages of the melt and led to the formation of multicomponent ores containing zircon, REE salts, and columbite of variable composition. The final phase in the formation of the ores was late hydrothermal and weathering processes. The high cryolite content in the rocks, and hence, the high fluorine concentrations in the solutions, caused secondary alterations of the rocks without significant changes in their bulk chemical composition.</p>","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"34 5","pages":"531 - 556"},"PeriodicalIF":1.0,"publicationDate":"2026-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149098585","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":"Crystal Size Distributions, Crystal Zoning, and Bulk Rock Geochemistry Correlation in Olivine Cumulates from the Yoko-Dovyren and Monchepluton Layered Intrusions","authors":"S. N. Sobolev,&nbsp;A. A. Ariskin","doi":"10.1134/S0869591126700013","DOIUrl":"10.1134/S0869591126700013","url":null,"abstract":"&lt;p&gt;The central point of this work is the crystal size distribution (CSD) data on primitive olivine cumulates from two large layered intrusions located in Russia: the Yoko-Dovyren massif (Northern Baikal region) and Monchepluton (Murmansk region, Kola Peninsula). Dunites, troctolites, harzburgites, and chromitites have been studied. Ninety-one crystal size distributions of olivine and chromite, acquired mostly manually in thin sections, are presented. The CSD shape tends to be loglinear, bimodal (kinked), or lognormal. Number of CSDs for the selected zone or the part of stratigraphic cumulate succession in the intrusion is enough to reveal sustainably repeating CSD patterns, which provide a clear kinetic fingerprint of a some point in the dynamic evolution of crystallizing magma bodies and protocumulate crystal mushes. The CSDs kinetic record in turn may be partly deciphered by comparing the natural CSD forms with mathematical or qualitative models of distribution formation. We used previously published models for explanation of different CSD shapes and also proposed a modified model with nonequilibrium &lt;i&gt;T&lt;/i&gt;-&lt;i&gt;t&lt;/i&gt; path for the origin of the primary loglinear distribution widely known in magmatic rocks. The first idea of proposed modification is simultaneous accounting in a single model experimentally known bell-shaped dependence of nucleation and growth rates on supercooling and also experimentally proved dependence of the growth rate on the grain size (proportional growth). Previous models include this effect only separately. The second idea is the dependence of the intensity of the proportional growth effect also on supercooling. To this stage of calculation the original equation is proposed. The selected model for the natural CSD pattern formation is additionally verified by studying the growth and dissolution history of individual grains, which is recorded in chemical or morphological zoning of crystals. Phosphorus and other trace element zoning of olivine was analyzed using electron microprobe mapping. Contrast BSE images were used for the observation of zonal inclusion distribution in chromite. To take into account that the most common case is the open-system behavior of magma meaning that crystals move relative to the mother liquid during crystal population formation, the additional element is required to prove the dynamic process suggested by kinetics. This element is the study of bulk geochemistry and its correlation with CSD types, which reflects how the particular area of crystal mush with specific CSD differs from its previous state and how step by step it evolves away from the initial magma. Following this, CSD and zoning data for a number of olivine-rich rock samples were correlated with the bulk chemical composition of the rocks. The last aspect of the approach described in the paper involves assessing the thermodynamic state of the initial magma and crystalline mush of the studied region of a chamber at the time of local sub","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"34 1","pages":"S1 - S105"},"PeriodicalIF":1.0,"publicationDate":"2026-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148552869","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":"Petrology, Geodynamics and Application of 3D Numerical Modeling for the Kara (Taimyr–Severnaya Zemlya) Orogen","authors":"V. A. Vernikovsky,&nbsp;A. E. Vernikovskaya,&nbsp;V. F. Proskurnin,&nbsp;N. Yu. Matushkin,&nbsp;O. P. Polyansky,&nbsp;A. N. Semenov","doi":"10.1134/S0869591126700104","DOIUrl":"10.1134/S0869591126700104","url":null,"abstract":"<p>We show that the Kara orogen formed due to oblique collision as evidenced by geological and paleomagnetic data. A distinct zoning in the emplacement of granitoids is noticeable – the syncollisional plutons are located in the western and central parts of the orogen, and the postcollisional ones – in the eastern part. The syncollisional granites were formed in zones of anatectic melting of crustal rocks and are located mainly in zones of amphibolite metamorphism and migmatization. The postcollisional granites form small stocks intruding the metamorphic rocks, the syncollisional granites, as well as unmetamorphosed Paleozoic cover deposits of the Central Taimyr accretionary belt. The main tectonothermal processes are explained, as well as the stages of crustal heating and the patterns in melt formation and emplacement of syncollisional and postcollisional granitoids. The transition from 2D to 3D modeling and the connection of the collision to the formation of the Siberian LIP are described.</p>","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"34 4","pages":"390 - 393"},"PeriodicalIF":1.0,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148532374","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":"The Sources of Cretaceous Magmatism in the Uda Sector of the Western Transbaikalian Rift Region Based on Geochemical and Isotopic (Sr, Nd, O, Pb) Data","authors":"A. A. Vorontsov,&nbsp;V. V. Yarmolyuk,&nbsp;S. I. Dril,&nbsp;V. M. Savatenkov,&nbsp;D. A. Lykhin,&nbsp;E. N. Federyagina,&nbsp;S. A. Sasim","doi":"10.1134/S086959112670030X","DOIUrl":"10.1134/S086959112670030X","url":null,"abstract":"<p>The Uda, Yeravna, and Zaza riftogenic depressions belong to the Uda sector, which serves as the central fragment of the Western Trans-Baikal rift zone. New Sr–Nd–Pb–O isotopic data on the Cretaceous basaltic rocks from each depression in combination with geochemical data made it possible to estimate the compositions of mantle and crustal magmas and to propose a model for their mixing.</p>","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"34 4","pages":"453 - 455"},"PeriodicalIF":1.0,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148532390","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}