Petrology最新文献

{"title":"Erratum to: Evidence for Partial Melting in Mantle Xenoliths of Spinel Lherzolites of Zhokhov Island, De Long Archipelago, Eastern Arctic","authors":"S. A. Silantyev, D. D. Badyukov, A. G. Akhmetshin, E. A. Krasnova","doi":"10.1134/S0869591125550016","DOIUrl":"10.1134/S0869591125550016","url":null,"abstract":"","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"33 4","pages":"422 - 422"},"PeriodicalIF":1.1,"publicationDate":"2025-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0869591125550016.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144814563","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":"Experimental Study of Phenakite Solubility in Aluminosilicate Melts: Implication for the Genesis of Be Deposits","authors":"N. I. Suk,&nbsp;B. B. Damdinov,&nbsp;A. R. Kotelnikov,&nbsp;L. B. Damdinova,&nbsp;V. B. Khubanov,&nbsp;N. S. Bortnikov","doi":"10.1134/S0869591125700110","DOIUrl":"10.1134/S0869591125700110","url":null,"abstract":"<div><p>The solubility of phenakite (Be₂SiO₄) in granite melts was experimentally studied at temperatures of 1000 and 1100°C and pressures of 1 and 4 kbar in dry conditions and in the presence of 10 wt % H₂O. The starting materials were granite glasses with agpaitic coefficient of 1–2.5 and natural phenakite. It was found that the solubility of phenakite increases with increasing agpaitic index (Na + K)/Al of the melt, and the solubility of BeO in hydrous melts is higher than in dry ones. The solubility of phenakite also increases with pressure. The obtained experimental data were generalized with the previous data in the form of an equation describing the solubility of BeO in alkaline-granite melts coexisting with crystalline Be phases depending on the agpaitic index, temperature, and pressure. The results of the experiments and their generalizations support the model of Be concentration in alkaline hydrous melts—the products of differentiation of granite magmas.</p></div>","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"33 4","pages":"385 - 394"},"PeriodicalIF":1.1,"publicationDate":"2025-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1134/S0869591125700110.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144814432","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":"Namuaiv Lamprophyre Pipe in the Khibina Massif: Mechanism of Formation and Implications for the Nature of the Mantle Source of Late-Stage Magmatism in the Kola Alkaline Province","authors":"D. R. Shaikhutdinova,&nbsp;L. V. Sazonova,&nbsp;N. M. Lebedeva,&nbsp;A. A. Nosova,&nbsp;A. V. Kargin,&nbsp;A. A. Arzamastsev,&nbsp;V. P. Kovach","doi":"10.1134/S0869591125700067","DOIUrl":"10.1134/S0869591125700067","url":null,"abstract":"<div><p>This study presents petrographic, major and trace-element, and Sr-Nd isotopic data for rocks from the Namuaiv explosion pipe, which intrudes the Khibina massif in the Kola Alkaline Province (KAP). These rocks record the late stage magmatic event in the KAP’s evolution. The results provide insights into the formation mechanisms of alkaline-ultramafic explosion pipes and constrain the nature of the mantle source during the province’s late magmatic stages. The pipe’s formation involved two distinct lamprophyric magmas—aillikite and monchiquite—as well as associated hydrothermal processes. The initial aillikite magma pulse underwent fluid fragmentation, whereas the subsequent monchiquite magma produced a hybrid rock— monchiquite breccia with aillikite magmaclasts. The fluid phases produced during explosive emplacement of aillikite formed a breccia with a natrolite-rich matrix. Some magmaclasts that were not incorporated into the monchiquite matrix were instead cemented into hydrothermal natrolite breccias. Geochemical and isotopic contrasts between early pre-Khibina lamprophyre dikes (Terskiy Coast)—coeval with alkaline-ultramafic carbonatite massifs—and later dikes and pipes (Khibina massif) suggest a shift in the composition of carbonate-bearing metasomatic assemblages in the mantle source. Early melts involved K-Na amphibole, but this metasomatic phase was exhausted during large-scale melting, leading to source depletion. Late-stage melts were instead derived from a phlogopite-bearing source, formed by metasomatic overprinting of potassium-rich melts generated by incongruent amphibole melting. K-Na amphibole was involved in the generation of the early melts, but this metasomatic phase was exhausted during large-scale melting, leading to source depletion. Instead, late stage melts were derived from a phlogopite-bearing source formed by metasomatic overprinting of the early depleted source. The metasomatic agent was potassium-rich melts derived from incongruent melting of K-Na amphibole.</p></div>","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"33 4","pages":"269 - 293"},"PeriodicalIF":1.1,"publicationDate":"2025-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144814558","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":"Dynamic Component of Pressure during Metamorphism in a Thrust Zone","authors":"Sh. K. Baltybaev,&nbsp;E. S. Vivdich,&nbsp;O. P. Polyansky,&nbsp;V. G. Sverdlova","doi":"10.1134/S0869591125700080","DOIUrl":"10.1134/S0869591125700080","url":null,"abstract":"<p>Elevated pressure (overpressure) was revealed in the southeastern fragment of the Raahe–Ladoga suture zone in Russia, within the Meyeri tectonic zone. It was caused by structural metamorphic transformations of rocks during collisional interaction of allochthonous and autochthonous blocks. It was supposed that tectonic interaction between the rigid crustal block of the Archean basement of the Karelian craton (autochthon) and the Proterozoic granulite block of the Svecofennian belt (allochthon) provided conditions for the formation of superlithostatic pressure anomalies. Mineral geobarometry and numerical thermomechanical modeling indicated pressures up to 9–11 kbar at a lithostatic pressure of 4–6 kbar. Based on the obtained results, it was argued that the nature of the local superlithostatic pressure (up to 7–9 kbar) established by mineral geobarometry and numerical thermomechanical modeling can be explained by tectonic interaction of blocks with heterogeneous physical and mechanical properties rather than by the errors of the applied mineral geobarometry tools.</p>","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"33 4","pages":"318 - 344"},"PeriodicalIF":1.1,"publicationDate":"2025-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144814559","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":"Basalt Melting in Dry and Hydrous Systems: Thermodynamic Modeling, Parameterization, and Comparison with Experimental Data","authors":"A. V. Sapegina,&nbsp;A. L. Perchuk","doi":"10.1134/S0869591125700109","DOIUrl":"10.1134/S0869591125700109","url":null,"abstract":"<p>Melting of metabasic rocks is a large-scale geologic process contributing to the formation of silicic volcanics and, especially, tonalite–trondhjemite–granodiorite (TTG) complexes, which make up a considerable portion of the ancient continental crust. Based on the phase equilibria modeling using the Perple_X program package, parameterization of melting was conducted for three compositions: anhydrous mid-ocean ridge basalt (MORB), MORB-H₂O (2.78 wt % H₂O), and hydrated basalt (altered oceanic crust, AOC, 2.78 wt % H₂O) at 500–1600°C and 0.0001–3 GPa. The obtained relations show good consistency with limited experimental data and indicate that the volume of melt produced in hydrous systems (MORB-H₂O and AOC) increases rapidly (up to 20 vol %) within 20–30°C above the hydrous solidus, which is followed by a more moderate increase in the degree of melting with increasing temperature. The modeling demonstrated that the near-solidus melts of the hydrous systems are rhyolitic and trachydacitic in composition. An increase in the degree of melting results in a decrease in SiO₂ and alkalis and an increase in CaO, MgO, and FeO contents. Changes in melt volume and composition are considered in connection with peritectic reactions and variations in H₂O content. The application of the parameterization of melting to metabasalts from the downgoing slabs in the Cascadia and Central Aleutian hot subduction zones revealed that these rocks underwent different degrees of melting along respective geotherms, and adakitic magmas are produced by such melting. The proposed parameterization of rock melting is useful for the analysis of the mechanisms of silicic rock formation in different geodynamic environments and can be implemented in the existing petrological and petrological–thermomechanical models.</p>","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"33 4","pages":"367 - 384"},"PeriodicalIF":1.1,"publicationDate":"2025-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144814560","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":"Hybrid Metaandesites of Khangar Volcano, Sredinny Range, Kamchatka: Product of Interaction between Basaltic Magma and Basement Granitoids?","authors":"M. L. Tolstykh,&nbsp;A. D. Babansky,&nbsp;M. M. Pevzner,&nbsp;Yu. A. Kostitsyn,&nbsp;N. N. Kononkova,&nbsp;L. A. Levitskaya,&nbsp;A. A. Plechova","doi":"10.1134/S0869591125700092","DOIUrl":"10.1134/S0869591125700092","url":null,"abstract":"<p>Unique rocks were found in an outcrop of basement granodiorites in the southern part of the Khangar caldera. The bulk composition of these rocks corresponds to high-Mg andesite (SiO₂ 57–63 wt %, MgO 4–8 wt %, and K₂O 1.4–2 wt %). The rocks contain coexisting quartz, oligoclase, and olivine phenocrysts and a propylitic mineral assemblage (albite, calcite, chlorite, and epidote). The largest phenocrysts are similar in composition to granodiorite minerals (oligoclase <i>An</i>_22–28, quartz, and biotite). The olivine phenocrysts contain melt inclusions of basaltic composition (SiO₂ 45–48 wt %, MgO 7–10 wt %) with a high K₂O content (up to 1.6 wt %). We suggest that these rocks were produced by interaction of basaltic melt with silicic intrusive material and with the xenogenic material of the granitoid intrusion.</p>","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"33 4","pages":"345 - 366"},"PeriodicalIF":1.1,"publicationDate":"2025-08-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144814562","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":"Geochemistry of Metavolcanic Rocks from Northern Ethiopia: Insights for Neoproterozoic Tectonic Setting of Arabian–Nubian Shield","authors":"Misgan Molla,&nbsp;Mulugeta Alene,&nbsp;Takashi Sano,&nbsp;Daniel Meshesha,&nbsp;Hayelom Mengesha,&nbsp;Gebremariam Mesele","doi":"10.1134/S0869591125700225","DOIUrl":"10.1134/S0869591125700225","url":null,"abstract":"<p>Major and trace element data were presented for the Mai Kenetal–Werii metavolcanic rocks within the Arabian–Nubian Shield to examine the petrogenesis and the tectonic setting of the area. Based on field observations and geochemical data, the metavolcanic rocks were classified into basalts, andesites, and dacite-rhyolites. The rocks are dominantly subalkaline (tholeiite to calc-alkaline) in composition. The low contents of Ni (0.1–78 ppm), Co (2–53 ppm), Cr (10–351 ppm), TiO₂ (0.18–1.59 wt %), MgO (0.62–9.16 wt %) and relatively with high contents of Al₂O₃ (10.39–18.51 wt %) indicate that the rocks were formed from more evolved magmas. The chondrite-normalized REE patterns also showed moderate fractionation, with (La/Yb)_N values ranging from 2.28 to 9.22, slightly negative to positive Eu anomalies (Eu/Eu*, 0.50–1.16), and relatively flat heavy REEs ((Gd/Yb)_N = 0.12–1.79). The rocks display slight enrichment in light rare earth elements (LREEs) and large ion lithophile elements (LILEs) relative to high field strength elements (HFSEs), representing rocks that were derived from more evolved magmas in a mature island arc setting. Whereas, the low ratios of Nb/La (0.17–1.66) and Nb/Yb (0.61–2.23), combined with low total REE content (ΣREE = 49.58–151.3 ppm), low Nb content (0.6–6.5 ppm), and high Zr/Nb ratios (20.7–96.67) indicate depleted mantle source. In addition, trace element ratios (Y/Nb = 4.11–15.44, Nb/Y = 0.06–0.24, La/Sc = 0.1–2.67, La/Y = 0.32–1.51 and La/Nb = 2.68–6.23) and discrimination diagrams (Zr/4–2Nb–Y, Th–Hf/3–Ta, and Th–Zr/117–Nb/16), indicate that the metavolcanic rocks have a calc-alkaline affinity that was formed in an island arc tectonic setting from subduction-related magmas within Arabian-Nubian Shield.</p>","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"33 5","pages":"545 - 560"},"PeriodicalIF":1.1,"publicationDate":"2025-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145204608","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":"Geochronology and Geochemistry of Zhaibeishan Granite and Its Relationship with Copper Deposit in the Eastern Tianshan, NW China","authors":"Zhiyuan Sun,&nbsp;Tao Yang,&nbsp;Jingyu Zhao,&nbsp;Yonggang Sun,&nbsp;Xinfa Li,&nbsp;Xiaoqiang Zhu","doi":"10.1134/S0869591125700213","DOIUrl":"10.1134/S0869591125700213","url":null,"abstract":"<p>The Zhaibeishan copper deposit is located at the eastern part of Aqishan-Yamansu metallogenic belt in eastern Tianshan. Zircon U-Pb geochronology, major and trace element, and Sr-Nd isotopic characteristics of Zhaibeishan granite and its relationship with mineralization have been studied. SHRIMP zircon U-Pb dating indicates an Early Carboniferous intrusive time (334.5 ± 2.6 Ma) of the granite. Chemically, Zhaibeishan granites have high silica (71.50–75.06%), aluminum (A/CNK = 1.02–1.23), sodium (Na₂O/K₂O = 0.95–23.83 with 6.89 on average), and total alkalis (Na₂O + K₂O = 6.65–8.43%), and low magnesium (&lt;1%) and titanium (&lt;1%) contents. The Chondrite-normalized REE patterns are characterized by enrichment of LREE relative to HREE (La_N/Yb_N = 4.05–6.85) with moderate negative Eu anomalies (δEu = 0.38–0.73). The Zhaibeishan granites show enrichment of K, Rb, (Large Ion Lithophile Elements), LREE and depletion of Nb, Ta, Ti, and P (High Field Strength Elements), indicating island arc magmatic characteristics. Sr-Nd isotopic data reveal that the I_Sr values range from 0.70473 to 0.70551, while ε_Nd(T) values range from 2.3 to 3.2. We suggest that the Zhaibeishan granites formed in continental arc setting in subduction zone and were probably derived from the product of magma mixing between crust and mantle magmas and experienced subsequent fractional crystallization. Combined with the fluid inclusion and published ore-forming age and isotopic data, we suggest that porphyry mineralization and blind copper orebodies probably exist in the deep part of the Zhaibeishan copper mining area.</p>","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"33 5","pages":"561 - 580"},"PeriodicalIF":1.1,"publicationDate":"2025-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145204614","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":"Jadeitite in Metalherzolite of the El’denyr Massif, Chukotka: Mechanism and Setting of Its Formation","authors":"B. A. Bazylev,&nbsp;G. V. Ledneva","doi":"10.1134/S0869591125700055","DOIUrl":"10.1134/S0869591125700055","url":null,"abstract":"<p>The paper presents the first data on the petrography, mineralogy, and geochemistry of jadeitites from the El’denyr massif, Chukotka, Russia, as well as host metalherzolites and amphibolite inclusions in the jadeitites. The jadeitite is composed of an association of jadeite, omphacite, analcime, and pectolite with a Ba−Ti−Si accessory mineral. The host metalherzolite is made of an association of olivine, antigorite, diopside, chlorite, ferrite-chromite, chromium magnetite, and accessory awaruite, heazlewoodite, and pentlandite. The jadeitite contains inclusions with a relict coarse-grained hypidiomorphic-granular texture, which are considered to be relics of the metasomatized protolith of the jadeitite. This protolith was probably high-temperature hydrothermal diopsidite. The inclusions show local recrystallization of primary diopside to aegirine-augite and pseudomorphic development of a fine-grained aggregate of amphiboles (several generations of richterite, actinolite, magnesiokatophorite, K-richterite, and eckermannite), omphacite, pectolite, analcime, phlogopite, accessory maucherite and heazlewoodite after diopside/aegirine-augite and an associated unidentified mineral. The protolith was transformed in several stages before the onset of jadeite crystallization, and these transformations included metasomatic recrystallization and a complete change in its texture. During the last stage, crystallization of the euhedral concentrically zoned jadeite with analcime and pectolite from fluid was accompanied by the recrystallization and dissolution of the last reworked relics of the protolith represented by high-calcium omphacite in microgranular omphacite-jadeite aggregates of jadeitite. The formation of jadeitites and the accompanying metamorphism of the host lherzolites occurred at 500°C and 8.5 kbar, which corresponds to <i>P–T</i> conditions typical of the metamorphism of mantle wedge peridotites in the “warm” subduction regime. The presence of jadeitites in the El’denyr massif and high-pressure metamorphic rocks in the Ust’-Belaya massif, which were studied previously, allows us to consider the Ust’-Belaya terrane as a mélange of a subduction zone active in the Early–Middle Triassic that was deformed and disintegrated during its subsequent exhumation in the Cretaceous.</p>","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"33 3","pages":"180 - 204"},"PeriodicalIF":1.1,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145171853","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":"Volatile Contents During the Formation of Olivinite and Olivine-Monticellite Rocks of the Krestovskaya Alkaline–Ultrabasic Carbonatite Intrusion, Polar Siberia: Pyrolysis-Free Gas Chromatography-Mass Spectrometry Data","authors":"L. I. Panina,&nbsp;E. Yu. Rokosova,&nbsp;A. T. Isakova,&nbsp;A. A. Tomilenko,&nbsp;T. A. Bul’bak","doi":"10.1134/S0869591125700031","DOIUrl":"10.1134/S0869591125700031","url":null,"abstract":"&lt;div&gt;&lt;p&gt;The parental larnite-normative alkaline ultramafic (kamafugite) melt sequentially forming olivinite and olivine-monticellite rocks of the Krestovskaya alkaline–ultrabasic carbonatite intrusion is enriched with hydrocarbons (HC) and their derivatives, nitrogenated, chlorinated, fluorinated, sulfonated compounds, as well as H&lt;sub&gt;2&lt;/sub&gt;O and CO&lt;sub&gt;2&lt;/sub&gt; according to pyrolysis-free gas chromatography-mass spectrometry data (GC–MS). The aliphatic, cyclic, oxygenated compounds, and very few heterocyclic compounds are determined among the hydrocarbons. During the crystallization of &lt;i&gt;olivine&lt;/i&gt; in olivinites, volatiles are enriched in hydrocarbons (59.30 rel %), excluding nitrogenated, chlorinated, and sulfonated derivatives and including predominant amount of oxygenated compounds (52.17 rel %) and subordinate amount of aliphatic and cyclic compounds (6.70 rel %). During the crystallization of &lt;i&gt;perovskite&lt;/i&gt; in olivine-monticellite rocks, the amount of oxygenated hydrocarbons slightly decreases (34.77 rel %) and that of aliphatic and cyclic compounds increases up to 10.55 rel %. The crystallization of &lt;i&gt;monticellite&lt;/i&gt; is accompanied by the predominance of aliphatic and cyclic hydrocarbons (59.67 rel %) and subordinate amounts of oxygenated hydrocarbons (29.35 rel %). The calculated H/(O + H) ratio of 0.78 and 0.77 for volatiles in olivine and perovskite, respectively, indicates the reducing conditions of crystallization of these minerals. On the stage of &lt;i&gt;olivine&lt;/i&gt; crystallization in olivinite, the volatiles also contain 4.1 rel % of nitrogenated, 4.58 rel % of sulfonated, 0.19 rel % of chlorinated, 0.12 rel % of fluorinated hydrocarbons, 0.49 rel % CO&lt;sub&gt;2&lt;/sub&gt;, and 31.17 rel % H&lt;sub&gt;2&lt;/sub&gt;O. The crystallization of perovskite in the olivine-monticellite rocks is accompanied by the further accumulation of nitrogenated compounds up to 8.95 rel %, sulfonated (9.53 rel %) and chlorinated (11.33 rel %) hydrocarbons, and 16.48 rel % CO&lt;sub&gt;2&lt;/sub&gt;. At this stage, the content of H&lt;sub&gt;2&lt;/sub&gt;O in the volatiles decreases to 7.66 rel % due to its binding to cations and Al–Si-radicals of the melt into hydroxyl-bearing compounds. At the final stage of perovskite crystallization and the initial stage of &lt;i&gt;monticellite&lt;/i&gt; crystallization, when volatiles were saturated in the critical amounts of chlorinated, nitrogenated, and sulfonated compounds and CO&lt;sub&gt;2&lt;/sub&gt;, they become to dissolve in the melt and react with it: most of the considered volatiles, together with Ca and alkalis of the melt, form carbonate–salt compounds and the melt became silicate–salt in composition. According to GC–MS data, a residual gaseous phase of monticellite-hosted inclusions is characterized by only 2.29 rel % nitrogenated and 1.11 rel % sulfonated, 0.32 rel % chlorinated, and 0.35 rel % fluorinated hydrocarbons, 0.04 rel % CO&lt;sub&gt;2&lt;/sub&gt; and 6.15 rel % H&lt;sub&gt;2&lt;/sub&gt;O at an increase of hydrocarbons up to 89.63 rel %. The crystallization of monticellite was","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"33 3","pages":"241 - 252"},"PeriodicalIF":1.1,"publicationDate":"2025-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145171504","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}