Petrology最新文献

{"title":"Sulfur Isotope Heterogeneity of Eclogites and the Scales of Fluid Mass-Transfer in the Root Zones of Subduction-Collision Orogens (North Muya Block, Northeastern Transbaikalia)","authors":"S. Yu. Skuzovatov,&nbsp;Yu. I. Tarasova,&nbsp;V. N. Reutsky,&nbsp;T. A. Velivetskaya,&nbsp;V. S. Shatsky","doi":"10.1134/S0869591126700220","DOIUrl":"10.1134/S0869591126700220","url":null,"abstract":"<p><b>Abstract</b>—Variably retrogressed eclogites and amphibolites from the North Muya block (Eastern Siberia) bear disseminated pyrite + chalcopyrite ± pyrrhotite mineralization of metasomatic origin. Fluid metasomatism led to the precipitation of pyrite with contrasting δ³⁴S signatures (from −10 to +9‰) produced by oxidized (<span>({text{SO}}_{4}^{{2 - }})</span>) or reduced (H₂S or HS⁻) sulfur from a fluid. The data indicate contrasting sulfur reservoirs in the deep orogenic lithosphere, which were controlled by devolatilization of variably oxidized metasediments.</p>","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"34 4","pages":"429 - 431"},"PeriodicalIF":1.0,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148532384","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":"Alexander Postels’ Geognostic Collection and Its Scientific Significance","authors":"A. Ya. Dokuchaev,&nbsp;F. V. Kulakov,&nbsp;E. N. Matvienko,&nbsp;V. N. Smolyaninova,&nbsp;E. L. Sokolova","doi":"10.1134/S0869591126700323","DOIUrl":"10.1134/S0869591126700323","url":null,"abstract":"<p>Participating in the 1826–1829 expedition round the world on board of the naval sloop <i>Senyavin</i>, commanded by F.P. Litke (F.B. von Lütke), Alexander Postels, who was then a scientist at the St. Petersburg University, collected a <i>geognostic</i> (geological and mineralogical) collection, which was then handed over to the Mineralogical Museum of the Russian Imperial Academy of Sciences. This collection was gathered in compliance with guidelines from the Admiralty Board and the Imperial Academy of Sciences. One of these guidelines was “Guidelines for the Would-Be Voyage about the World in What Concerns Mineralogy and the Theory of the Earthˮ, prepared by V.M. Severgin in 1803 for the first and all subsequent round-the-world expeditions to Russian possessions in Alaska. A.F. Postels’ collection provides an insight into the state of earth sciences as of the early and mid-19th century, and some reference samples from it are currently included in the systematic collections of academic museums: the Ore and Petrographic Museum of the Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of the Russian Academy of Sciences, and A.E. Fersman Mineralogical Museum of the Russian Academy of Sciences.</p>","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"34 4","pages":"461 - 464"},"PeriodicalIF":1.0,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148532388","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":"Main Stages of Evolution of the Neoproterozoic Active Continental Margin of the Western Part of the Central Asian Fold Belt","authors":"A. A. Tretyakov,&nbsp;K. E. Degtyarev,&nbsp;N. A. Kanygina,&nbsp;A. N. Zhuravlev,&nbsp;K. A. Tretyakova","doi":"10.1134/S0869591126700360","DOIUrl":"10.1134/S0869591126700360","url":null,"abstract":"<p>The formation of the Neoproterozoic complexes of the Precambrian terranes of Southwestern Kazakhstan, the Northern and Middle Tien Shan, occurred in the lateral series of structures of the active continental margin. In the interval of ~850–760 Ma, volcanic, intrusive and terrigenous-carbonate complexes were formed in a suprasubduction setting, in the rear, frontal and fore-arc areas of the active margin. In the interval of ~760 to 715 Ma, a change from a convergent to a transform evolution mode of the active margin led to the formation of riftogenic magmatic complexes.</p>","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"34 4","pages":"465 - 467"},"PeriodicalIF":1.0,"publicationDate":"2026-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148532401","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":"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}