Petrology最新文献

{"title":"Felsic Melt Inclusions in Olivine of Ultramafic Rocks of the Uitkomst Complex (Bushveld Province) as Evidence for Crustal Anatexis","authors":"I. P. Solovova,&nbsp;M. A. Yudovskaya,&nbsp;A. A. Averin,&nbsp;J. Kinnaird","doi":"10.1134/S0869591126700384","DOIUrl":"10.1134/S0869591126700384","url":null,"abstract":"<p>We studied melt inclusions of two types (MI-1 and MI-2) coexisting in cumulus olivine <i>Fo</i>_91–92 of ultramafic rocks from the Uitkomst layered intrusion, which is part of the Bushveld Magmatic Province. The inclusions differ in the association of daughter phases, their composition and behavior during heating, and temperature of partial homogenization. The main daughter phases of fully crystallized equigranular melt inclusions of type MI-1 are olivine and orthopyroxene. Some inclusions were not completely homogenized even at the maximum experimental temperature of 1450°C, and their melts contained up to 22.5 wt % MgO, 52 wt % SiO₂, and minor amounts of CaO, alkalis, volatile components (including no more than 168 ppm H₂O), and fluid-mobile elements. It was calculated that the primary magma in equilibrium with olivine <i>Fo</i>₉₁ was generated at 1590°C and 2.5 GPa and corresponded to dry high-silica komatiite. The MI-1 inclusions coexist with type MI-2 melt inclusions of felsic composition. Among the daughter phases of MI-2, glass, apatite, amphibole, microgranophyric feldspar–quartz intergrowths, perovskite, titanite, ilmenite, and rutile were identified. The temperature of MI-2 entrapment was approximately 1063–1100°C, and their melt quenched under natural conditions contained up to 75 wt % SiO₂, 10 wt % Na₂O, and 0.6 wt % MgO on average. Raman spectroscopy indicated that the fluid in the inclusions is a methane–hydrogen mixture with admixtures of nitrogen, <span>({text{CO}}_{3}^{{2 - }})</span>, OH^– group, and liquid H₂O and coexists with dispersed carbon (C). We considered possible mechanism of the formation of felsic melt in a flow-through magma chamber with chromite–olivine cumulate, which is replenished by magma portions with progressively increasing MgO content. The chemical compositions of the felsic melt enriched in alkalis and volatiles and associating fluid indicate their formation through the melting of a sedimentary (metapelitic) protolith. Dissolution and crystallization events in the zone of variable thermal gradient during multiple injections of fluid-saturated melt in the central part of the flow-through magma conduit did not affect olivine hosting two types of coexisting inclusions. The presence of inclusions of felsic anatectic xenomelt in highly magnesian olivine from the Uitkomst Complex exemplifies a universal mechanism of local contamination at the development of an intrusion.</p>","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"34 4","pages":"486 - 509"},"PeriodicalIF":1.0,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148532378","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":"Magma Sources and Granitoid Formation Conditions in the Southern Part of the Main Batholith Belt (Kolyma)","authors":"A. A. Tsygankov,&nbsp;G. N. Burmakina","doi":"10.1134/S0869591126700190","DOIUrl":"10.1134/S0869591126700190","url":null,"abstract":"<p>The largest Late Jurassic–Early Cretaceous Main (Kolyma) Batholith Belt in Northeast Asia is composed mainly of <i>Bt</i>- and <i>Amp-Bt</i> granites and granodiorites with increased alumina content and potassium alkalinity. The granitoid plutons of the southern part of the belt are similar in structure and composition, but they are characterized by significant variations in Nd isotopic composition, corresponding to parameters of the Meso-Neoproterozoic continental crust. It is assumed that the formation of the granitoids is related to melting of metaterrigenous sediments of the passive margin, which were formed by the erosion of the Siberian paleocontinent in a post-collisional or suprasubduction geodynamic setting.</p>","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"34 4","pages":"417 - 419"},"PeriodicalIF":1.0,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148532418","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":"Study of Fluid-Bearing Magmatic Systems: A Case Study of Kamchatka","authors":"P. Yu. Plechov","doi":"10.1134/S0869591126700165","DOIUrl":"10.1134/S0869591126700165","url":null,"abstract":"<p>The results of a comprehensive investigation of fluid-bearing magmatic systems of the island-arc type are presented, with Kamchatka serving as a case study. The research was conducted at the interface of petrology, geochemistry, and mineralogy, employing modern methods for analyzing melt and fluid inclusions (SIMS, LA-ICP-MS, Raman spectroscopy) and numerical modeling using the Petrolog software package. More than 50 volcanic objects were studied in detail; over 10 objects containing mineral parageneses reflecting the melting conditions of the mantle substrate were identified. It was established that, along with classic mantle sources (depleted mantle + aqueous fluid), melts formed during partial melting of lower crust amphibolites (8–10 kbar, 1130–1160°C, degree of melting &gt;25%) play a significant role in magma generation. A model of island-arc magmatism evolution is proposed, involving the sequential engagement of mantle, crustal, and restitic sources. Based on the analysis of products from nine catastrophic eruptions over the last 10 kyr, degassing volumes were estimated for the first time (≥8 Tt of gases in total, including 160 Mt of SO₂ and 250 Mt of Cl), along with their potential climate impact. Using the 2017 eruption of Bezymianny volcano as an example, a two-chamber model of the trigger mechanism for explosive eruptions was developed, associated with hornblende decomposition and fluid migration.</p>","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"34 4","pages":"410 - 411"},"PeriodicalIF":1.0,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148532420","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":"Vesuvianite—a New U–Pb Mineral-Geochronometer for Determining the Age of Ore Formation: First Results and Prospects for Application","authors":"M. V. Stifeeva,&nbsp;T. L. Panikorovskii,&nbsp;E. B. Salnikova,&nbsp;A. B. Kotov","doi":"10.1134/S0869591126700244","DOIUrl":"10.1134/S0869591126700244","url":null,"abstract":"<p>The results of U–Pb (ID-TIMS) geochronological studies of vesuvianite group minerals are presented. The fundamental possibility of their application for dating contact-reaction processes is demonstrated. Based on the results of detailed crystallochemical and isotope-geochemical studies, it has been established that boron-containing varieties of vesuvianite (wiluite) have the highest potential as U–Pb geochronometer minerals. This is demonstrated by the example of vesuvianite samples from akhtarandite rocks of the Wilui River and contact-reaction rocks of the Quebec province (Templeton ore occurrence, Canada).</p>","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"34 4","pages":"439 - 441"},"PeriodicalIF":1.0,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148532389","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":"Petrographic, Geochemical, and Isotopic Characteristics of Neoproterozoic Dolerites of the Sayan-Baikal Dike Belt in the Southern Part of the Siberian Craton","authors":"T. V. Donskaya,&nbsp;D. P. Gladkochub,&nbsp;E. I. Demonterova,&nbsp;A. M. Mazukabzov","doi":"10.1134/S0869591126700116","DOIUrl":"10.1134/S0869591126700116","url":null,"abstract":"<p>Neoproterozoic (725–715 Ma) dolerite dikes ascribed either to the Sayan–Baikal dike belt or to the Irkutsk Large Igneous Province (LIP) are widespread in the southern part of the Siberian Craton. The age of the dolerites matches that of the Franklin LIP, indicating that the dikes formed during rifting associated with the breakup of the Rodinia supercontinent and the separation of the Siberian Craton from Laurentia. The chemical compositions of all dolerites of the Sayan–Baikal dike belt correspond to subalkaline tholeiitic basalts and basaltic andesites with low TiO₂ and P₂O₅ concentrations. However, the dolerites in the different parts of the belt differ in geochemical and isotopic characteristics. It is suggested that the dolerites may have formed either as a result of melting of a subcontinental lithospheric mantle source, or by mixing of mantle components in varying proportions, or by crustal contamination of the mantle source. Neoproterozoic dolerites of the Sayan–Baikal dike belt in different parts of the Siberian Craton were derived from heterogeneous mantle sources vaiably subjected to crustal contamination.</p>","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"34 4","pages":"394 - 396"},"PeriodicalIF":1.0,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148532376","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":"14th All-Russia Petrographic Conference, St. Petersburg, October 3, 2025","authors":"Editorial Board","doi":"10.1134/S0869591126700372","DOIUrl":"10.1134/S0869591126700372","url":null,"abstract":"","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"34 4","pages":"381 - 381"},"PeriodicalIF":1.0,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148532367","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":"Anomalous Source of the Dovyren Magmas: from Neoarchean Protolith to the Upper Riphean Crystallization History","authors":"A. A. Ariskin,&nbsp;Yu. A. Kostitsyn,&nbsp;E. O. Dubinina,&nbsp;S. G. Tessalina,&nbsp;I. V. Pshenitsyn","doi":"10.1134/S0869591126700086","DOIUrl":"10.1134/S0869591126700086","url":null,"abstract":"<p>Results of isotope-geochemical studies of the Upper Riphean rocks from the Dovyren Intrusive Complex and comagmatic metavolcanics of the Synnyr Ridge in northern Transbaikalia, Russia, are summarized. The trace-element geochemistry and data on radiogenic isotopes (Rb–Sr, Sm–Nd, and Re–Os), combined with data on the sulfur and oxygen isotope compositions, indicate that the Dovyren magmas were derived from an anomalous and long-lived source, produced in relation to Neoarchean processes of mantle melting that had formed a heterogeneous protolith with signatures of lower crustal contamination during the early evolution of the Siberian Craton.</p>","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"34 4","pages":"384 - 386"},"PeriodicalIF":1.0,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148532368","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":"Russia’s First Scientific Systematic Petrographic Collection: Foundation and Development","authors":"A. Ya. Dokuchaev,&nbsp;V. N. Smol’yaninova,&nbsp;F. V. Kulakov","doi":"10.1134/S0869591126700335","DOIUrl":"10.1134/S0869591126700335","url":null,"abstract":"<p>The permanent exhibit “Systematic collection of igneous rocksˮ (which is put on display in nine showcases) in the Ore and Petrographic Museum corresponds to the principal guidelines formulated by the Interdepartmental Petrographic Committee. The specialized Registration Journal (Catalogue) “Peter the Great Geological Museum of the Imperial Academy of Sciences. Systematic Petrographic Collection” was started at the museum in 1912, with records on the most valuable petrographic rock samples entered in it. The requirements for the reference samples and collections of the museum were strictly regulated by proprietary instructions of the museum. Its collection currently consists of 750 samples representing 147 types of igneous rocks from around the world.</p>","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"34 4","pages":"458 - 460"},"PeriodicalIF":1.0,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148532385","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":"Siliceous-Alkaline Metasomatites in the Precambrian Basement of the Torsko-Apsat Ore Cluster (Transbaikalia): Types, Position, and Role in Ore Genesis","authors":"V. I. Uyutov,&nbsp;S. S. Dvurechenskaya,&nbsp;A. M. Moiseenko","doi":"10.1134/S086959112670027X","DOIUrl":"10.1134/S086959112670027X","url":null,"abstract":"<p>In the Archean basement of the Torsko-Apsatsky ore unit, in the process of prospecting and appraisal work for gold, a repeated manifestation of metasomatic processes involving potassium, realized in the form of siliceous-alkaline metasomatites, gumbeite, eisites, was established. The petrographic composition of metasomatites and their role in the formation of gold ore mineralization have been studied. An opinion was expressed on the genetic unity of eisites and gumbeites, as well as on the origin of gold-bearing gumbeites as products of the genetically independent and geochemically specialized alkaline potassium system of the sublithospheric level regionally manifested in the Mesozoic Aldan-Stanovoy geoblock.</p>","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"34 4","pages":"442 - 443"},"PeriodicalIF":1.0,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148532377","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":"Genetic Features in the Distribution and Concentrations of Ore Components in the Rocks of the Dunite–Clinopyroxenite–Gabbro Massifs: An Example of the Ural Platinum Belt","authors":"S. Yu. Stepanov,&nbsp;A. V. Kozlov,&nbsp;R. S. Palamarchuk","doi":"10.1134/S0869591126700232","DOIUrl":"10.1134/S0869591126700232","url":null,"abstract":"<p>This paper summarizes preexisting data on the geochemistry of ore components in the dunite–clinopyroxenite–gabbro rocks of the Ural Platinum Belt. These data have led to a number of genetic conclusions regarding the nature of the distribution and concentrations of these components. The data provide evidence in support of the conclusion about the common evolution of rocks in the dunite–clinopyroxenite–gabbro sequence of igneous dunite–clinopyroxenite–gabbro complexes.</p>","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"34 4","pages":"432 - 434"},"PeriodicalIF":1.0,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148532402","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}