Mineralogy and Petrology最新文献

{"title":"Serpierite polytypoids from Zvezdel, Bulgaria, and Lavrion, Greece","authors":"Rositsa P. Nikolova,&nbsp;Nadia L. Petrova,&nbsp;Zlatka G. Delcheva,&nbsp;Liliya V. Tsvetanova,&nbsp;Tsveta Stanimirova,&nbsp;Iskra Piroeva","doi":"10.1007/s00710-022-00797-9","DOIUrl":"10.1007/s00710-022-00797-9","url":null,"abstract":"<div><p>Structural characteristics of serpierite samples from Zvezdel, Bulgaria, and Lavrion, Greece, are reported. The thermal behaviour of serpierite from Lavrion is discussed. The chemical composition of the studied samples is analysed by energy-dispersive spectroscopy (EDS) and confirmed by single-crystal structure refinements. The obtained chemical formulas correspond well to that of serpierite with Cu:Zn ratio varying between 2.9 and 5.6. The sample from Zvezdel, with composition Ca[Cu_3.3Zn_0.7(OH)₆(SO₄)₂•3H₂O, crystallizes in the monoclinic crystal system, with space group <i>I</i>2 and unit-cell parameters <i>a</i> = 18.418(3), <i>b</i> = 6.220(1), <i>c</i> = 12.091(2) Å, <i>β</i> = 90.78(1)˚, whereas the one from Lavrion Ca[Cu_2.8Zn_1.2(OH)₆(SO₄)₂]•3H₂O, shows similar unit-cell parameters <i>a</i> = 18.394(1), <i>b</i> = 6.256(1), <i>c</i> = 12.097(1) Å, <i>β</i> = 90.92(1)˚, but higher <i>I</i>2<i>/m</i> space-group symmetry. Both studied crystals exhibit serpierite structure topology, but different stacking sequence of the octahedral layers. While in previously studied serpierite of Sabelli and Zanazzi (Acta\u0000Cryst B24:1214-1221, 1968) there are two layers per unit cell, in currently studied samples there is only one. As a consequence, their unit-cell volumes are half than that of the first structurally characterized serpierite specimen with SG <i>C</i>2/<i>c</i> and unit-cell parameters <i>a</i> = 22.186(2), <i>b</i> = 6.250(2), <i>c</i> = 21.853(2) Å, <i>β</i> = 113.36(1)˚. Taking into account the structural peculiarities of the studied samples they are considered as serpierite polytypoids.</p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"117 1","pages":"27 - 38"},"PeriodicalIF":1.8,"publicationDate":"2022-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00710-022-00797-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4320172","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":"Petrology of ultramafic and mafic rocks from the South Andaman Ophiolite, Bay of Bengal: Evidence for an arc-related high-pressure origin","authors":"Tavheed Khan,&nbsp;Luc Achille Ziem A Bidias,&nbsp;Syed H. Jafri,&nbsp;Rohit Pandey,&nbsp;Nittala V. Chalapathi Rao,&nbsp;Manavalan Satyanarayanan,&nbsp;Drona Srinivasa Sarma","doi":"10.1007/s00710-022-00796-w","DOIUrl":"10.1007/s00710-022-00796-w","url":null,"abstract":"<div><p>Minor ultramafic (dunite) and mafic (gabbroic) rock occurrences are exposed in South Andaman Island, Bay of Bengal. Dunite is in contact with serpentinite, while gabbroic rocks are in contact with the pyroxenite. Petrographic analysis using a petrographic microscope, major and trace element [including rare earth elements (REE)] analysis using an X-ray Fluorescence (XRF) spectrometer and the High Resolution Inductively Coupled Plasma Mass Spectrometer (HR-ICPMS), and mineral chemistry using an Electron Probe Micro-Analyzer (EPMA) were performed on selected ultramafic and mafic rocks. Petrographically, dunite is composed of olivine, clinopyroxene, and orthopyroxene, while olivine, clinopyroxene, orthopyroxene, and calcic plagioclase are present in olivine–gabbronorite. The bulk rock elemental relationship (Zr versus P₂O₅ and TiO₂ versus Zr/P₂O₅) indicate that the dunite and olivine–gabbronorite are tholeiitic in composition. The clinopyroxene with high Mg# [Mg²⁺/(Mg²⁺ + Fe²⁺)] and lower TiO₂ content is present in dunite, whereas the clinopyroxene with high Mg# and high TiO₂ content exists in olivine–gabbronorite. Cr₂O₃ versus Mg# in the clinopyroxene relationship and negative Nb, Ta, and Ti anomalies in these rocks imply high pressure arc related peridotite mantle source. Our results suggest that the dunite and gabbroic rocks were also intruded in the Andaman Ophiolitic suite of rocks during earlier subduction setting in Late Cretaceous time. Further, it is suggested that these ophiolites have been obducted on to the leading edge of the Eurasian continent during the Mid–Eocene to Late Oligocene event, prior to the current tectonically active Andaman–Java subduction, which was initiated in the Late–Miocene.</p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"116 6","pages":"473 - 492"},"PeriodicalIF":1.8,"publicationDate":"2022-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00710-022-00796-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4954912","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":"Multi-stage alteration history of volcanic clasts containing buddigtonite from Upper Cretaceous strata of the Subsilesian Unit, Czech part of the Outer Flysch Carpathians","authors":"Dalibor Matýsek,&nbsp;Petr Skupien,&nbsp;Miroslav Bubík,&nbsp;Jakub Jirásek,&nbsp;Radek Škoda","doi":"10.1007/s00710-022-00794-y","DOIUrl":"10.1007/s00710-022-00794-y","url":null,"abstract":"<div><p>Floods in 1997 and 2010 exposed the Frýdek and Frýdlant formations of the Subsilesian Unit in the Ostravice River bed near Frýdek-Místek. In the sedimentary sequence of upper Campanian to Maastrichtian marls and paraconglomerates, clasts of strongly altered basic volcanic rock were found, accompanied by carbonate concretions and layers. Rare apatite, biotite, and a Cr-rich spinel subgroup mineral are the only relatively well-preserved primary minerals in the clasts. The matrix contains buddingtonite, albite, sanidine, kaolinite, illite-muscovite, a mineral of the smectite group, and possibly also a mixed structure mineral of the chlorite-smectite type. Laths of buddingtonite, identified by powder X-ray diffraction and wavelength-dispersive X-ray spectrometry, are not homogenous. Their compositions range from Bd₄₁ to Bd₅₉ molar component, with Kfs ranging between 26 and 35 mol%, Nafs between 5 and 27 mol%, and Ca-feldspar between 1 and 4 mol%. The matrix is irregularly dolomitized. Carbonates are also present in pseudomorphs after idiomorphic olivine and in fill of amygdaloidal cavities. These carbonates reveal complicated alteration rock history, having cores of magnesite passing into almost pure siderite outer parts. Calcite is always the youngest and most homogenous carbonate, probably connected with a different geological event. Accompanying carbonate concretions are composed of three dolomitic phases with quartz, calcite, and muscovite. We can conclude that buddingtonite originates in alteration of primary feldspar and/or volcanic glass during the catagenetic breakdown of kerogen in the sediment, surrounded by clayey sediments rich in decomposing organic matter. Volcanic clasts have similar texture and supposed pre-alteration phase composition as the rocks of teschenite association, namely monchiquites to picrites. However, the source of volcanic clast within the sediments remains unclear.</p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"116 6","pages":"429 - 441"},"PeriodicalIF":1.8,"publicationDate":"2022-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4439096","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":"Unraveling the pre-metamorphic cooling history of the Koraput Alkaline Complex, India: constraints from feldspar exsolution texture","authors":"Manojit Koley,&nbsp;Biswajit Ghosh,&nbsp;Debaditya Bandyopadhyay,&nbsp;Sankhadeep Roy,&nbsp;Archisman Dhar,&nbsp;Soumi Chattopadhaya,&nbsp;Rajib Kar,&nbsp;Samarendra Bhattacharya","doi":"10.1007/s00710-022-00795-x","DOIUrl":"10.1007/s00710-022-00795-x","url":null,"abstract":"<div><p>Intracrystalline exsolution textures in alkali feldspar are common in lithotypes from many alkaline complexes of the Eastern Ghats Granulite Belt (EGGB), India. However, the parentage of these textures and their compositional evolution is not well documented from this granulite belt. This study on the Koraput Alkaline Complex (KAC) in the EGGB documents the exsolution textures from several lithologies, establishes their igneous origin and finally links their compositional modifications with the evolutionary history of the complex. The studied exsolution textures belong to both perthite and mesoperthite. To estimate the temperature of formation of these textures, we used both two-feldspar thermometry, and one-feldspar thermometry following several models. In two-feldspar thermometry, compositions of exsolved alkali feldspar and the adjacent plagioclase feldspar pairs were used. In one-feldspar thermometry, the reintegrated compositions of exsolved alkali feldspars were used. The maximum temperature of formation of exsolution lamellae estimated from two-feldspar thermometry for mesoperthites in nepheline syenite is &gt; 841 °C, and for perthites is &gt; 759 °C, at 7 kbar pressure. Compositions of initially formed plagioclase feldspar lamellae and the host feldspar were more orthoclase rich and more albite rich respectively compared to the observed compositions. Using one-feldspar thermometry the calculated temperatures for alkali gabbro, syenite and alkali feldspar granite are &gt; 870 °C, &gt; 810 °C and &gt; 730 °C, respectively. Compositions of alkali feldspars immediately before exsolution in these rocks were also estimated. Albite and orthoclase contents were nearly equal in mesoperthites; on the other hand, orthoclase content was higher than albite in perthites. Previous studies assigned their thermometric estimation with the minimum temperature of metamorphism that the KAC experienced, but the Ultra High Temperature (UHT) record obtained from the feldspar thermometry of the present study is difficult to correlate with these metamorphic events. Instead, these high temperatures may represent an igneous condition, which remained unaffected throughout the later metamorphic event as documented from nepheline syenite.</p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"116 6","pages":"493 - 513"},"PeriodicalIF":1.8,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00710-022-00795-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4042446","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":"Mineral chemistry of biotite and hornblende from mesoproterozoic quartz syenite intrusions of the Cuddapah Intrusive Province, Eastern Dharwar Craton, India: implications for their source characterization","authors":"Sridhar Nalluri, Mallikarjuna Reddy Ragi, Sesha Sai Valivetti, R. Pandey","doi":"10.1007/s00710-022-00793-z","DOIUrl":"https://doi.org/10.1007/s00710-022-00793-z","url":null,"abstract":"","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"117 1","pages":"529 - 551"},"PeriodicalIF":1.8,"publicationDate":"2022-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43392527","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":"La Queglia carbonatitic melnöite: a notable example of an ultra-alkaline rock variant in Italy","authors":"G. Vichi, M. Perna, Francesco Ambrosio, G. Rosatelli, D. Cirillo, S. Broom-Fendley, N. Vladykin, Daria Zaccaria, F. Stoppa","doi":"10.1007/s00710-022-00792-0","DOIUrl":"https://doi.org/10.1007/s00710-022-00792-0","url":null,"abstract":"","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"117 1","pages":"505 - 528"},"PeriodicalIF":1.8,"publicationDate":"2022-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49365388","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":"Plume related kimberlites and carbonatites","authors":"L. Kogarko","doi":"10.1007/s00710-022-00789-9","DOIUrl":"https://doi.org/10.1007/s00710-022-00789-9","url":null,"abstract":"","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"117 1","pages":"497 - 503"},"PeriodicalIF":1.8,"publicationDate":"2022-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46186874","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":"Petrogenetic relationships between peraluminous granites and Li- Cs-Ta rich pegmatites in south Issia zone (Central-West of Côte d’Ivoire): Petrography, Mineralogy, Geochemistry and zircon U–Pb Geochronology","authors":"Joseph Koffi Brou,&nbsp;Marieke Van Lichtervelde,&nbsp;Nicaise Alain Kouamelan,&nbsp;David Baratoux,&nbsp;Nicolas Thébaud","doi":"10.1007/s00710-022-00790-2","DOIUrl":"10.1007/s00710-022-00790-2","url":null,"abstract":"<div><p>The Issia batholith extends over 100 km in central Ivory Coast and is surrounded by important placer deposits of columbite-tantalite associated with deeply altered lithium-cesium-tantalum pegmatites. The genetic link between the granitic complex and the mineralized lithium-cesium-tantalum pegmatites at the origin of the coltan placers is not straightforward, considering the significant age difference (~ 40 Ma) between one of the granites and the coltan mineralization. In order to constrain the link between the granitic intrusions and the coltan placers, we have completed a petrological and geochemical study on eighteen granitic outcrops. Some granites are crosscut by pegmatite dykes, but neither the granites nor their intruding pegmatites dykes exibit primary Nb–Ta mineralization. Our results reveal three granite series (G1, G2, G3). The biotite-dominant G1 granites are the least fractionated, metaluminous to peraluminous, with trace element compositions close to average upper continental crust. The G2 and G3 granites are muscovite-rich, peraluminous with intermediate phosphorus contents up to 0.5 wt% P₂O₅. G2 and G3 have similar compositions except for lower Cs and Ta and higher Th, Hf and Zr in G2. G2 and G3 are strongly fractionated with up to 22 ppm Be, 57 ppm Cs, 505 ppm Rb, 16 ppm Sn, 11 ppm Ta, and a Nb/Ta ratio &lt; 1. The G3 granite and its intruding pegmatite dykes contain abundant tourmaline, garnet and Nb–Ta-rich ilmenite. We conclude that the G2 and G3 granite groups are genetically linked through fractional crystallization. Three hypotheses can explain the formation of the Li-Cs-Ta-rich liquids: (1) A fractional crystallization model where the G2-G3-pegmatite series evolves by fractional crystallization of an anatectic melt produced by melting of metasediments, (2) an anatectic model where all granites and pegmatites were formed by direct anatexis, and their strong differentiation degree would reflect an enriched metasedimentary source, (3) a granitic origin where melting of the most fractionated G3 granite produced the Li-Cs-Ta-rich liquids ~ 40 Myrs after the granite cooling. Geochronological results and textural evidence of granite melting tend to favor the third model, which indicates that crust re-heating occurred ~ 40 Ma after the emplacement of the Issia granitic complex.\u0000</p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"116 6","pages":"443 - 471"},"PeriodicalIF":1.8,"publicationDate":"2022-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00710-022-00790-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4234827","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":"Accessory Cr-spinel from peridotite massifs of the South Urals: morphology, composition and origin","authors":"Dmitry E. Saveliev,&nbsp;Vladimir V. Shilovskikh,&nbsp;Darkhan K. Makatov,&nbsp;Ruslan A. Gataullin","doi":"10.1007/s00710-022-00791-1","DOIUrl":"10.1007/s00710-022-00791-1","url":null,"abstract":"<div><p>The features of morphology and composition of accessory Cr-spinels from four ophiolitic peridotite massifs of the Southern Urals are considered. Massifs are localized in the Main Uralian Fault zone (Nurali, Mindyak), at its junction with the Sakmar zone (Kempirsai) and in the northern part of the Zilair zone (Kraka). The Kraka, Nurali and Mindyak massifs are composed mainly of lherzolites with subordinate harzburgites and dunites, while harzburgites predominate in the Kempirsai massif and dunites with large chromitite deposits are significantly developed in its southeastern part. The PT–<i>f</i>O₂ formation conditions of lherzolites correspond to the upper mantle below a rift structure: temperature of 700–1000 °C, pressure of 5–12 kbar, and oxygen fugacity varying from –2 to + 0.5 ΔFMQ. The compositional variations of Cr-spinels from primitive lherzolite (Cr# 0.15–0.30, Mg#0.6–0.8) to harzburgite (Cr# 0.3–0.6, Mg#0.5–0.7) and dunite (Cr# 0.6–0.8, Mg#0.4–0.7) and the increase in Mg# value of olivine are a result of synchronous processes of partial melting and plastic flow of the material in the upper mantle. Four main morphological Cr-spinel types are distinguished in lherzolites: (1) fine rods and lamellae within silicate grains and along their boundaries, (2) anhedral and holly-leaf grains closely intergrown with restitic olivine and enstatite, (3) anhedral and subhedral grains in an assemblage with plagioclase and diopside and (4) euhedral grains in dunites. The formation of type 1 grains is interpreted as a result of deformation-induced segregation of trace elements on structural defects of silicates with consequent crystallization of newly formed minerals. The advanced stages of solid-phase transformation produce the larger anhedral and holly-leaf grains in peridotites and euhedral grains in dunites (types 2 and 4 grains). The decompression replacement of a precursor high-pressure mineral (garnet?) is suggested for the formation of the Cr-spinel–plagioclase aggregates. The subhedral and euhedral grains in the assemblage with plagioclase and clinopyroxene could have formed as a result of crystallization from percolating melts or their reaction with restite.</p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"116 5","pages":"401 - 427"},"PeriodicalIF":1.8,"publicationDate":"2022-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5029395","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":"40Ar–39 Ar dating, whole-rock and Sr-Nd isotope geochemistry of the Middle Eocene calc-alkaline volcanic rocks in the Bayburt area, Eastern Pontides (NE Turkey): Implications for magma evolution in an extension-related setting","authors":"Abdullah Kaygusuz,&nbsp;Cem Yücel,&nbsp;Emre Aydınçakır,&nbsp;Mehmet Ali Gücer,&nbsp;Gilles Ruffet","doi":"10.1007/s00710-022-00788-w","DOIUrl":"10.1007/s00710-022-00788-w","url":null,"abstract":"<div><p>Discussions continue about whether Middle Eocene magmatism in the Eastern Pontides is associated with collision or subduction. This paper presents new whole-rock geochemistry, Sr-Nd isotopic and ⁴⁰Ar-³⁹Ar age data for Middle Eocene volcanic rocks from the Bayburt area of the Eastern Pontides (NE Turkey) to investigate their sources and evolutionary history. The new ⁴⁰Ar–³⁹Ar ages reveal that these volcanic rocks erupted between 44.6 ± 0.1 Ma and 43.5 ± 0.1 Ma, within the Lutetian (Middle Eocene). The studied volcanic rocks are composed of basalt, andesite, basaltic andesite and minor dacite lava and pyroclastic rocks. These rocks consist of plagioclase, amphibole, pyroxene, olivine, biotite, sanidine and minor quartz phenocrysts with Fe-Ti oxides. They have microlithic, hyalo-microlithic, porphyritic and rarely glomeroporphyritic textures. The volcanic rocks have low to high-K calc-alkaline affinities. They display enrichment in large-ion lithophile elements and depletion in high-field strength elements with high Th/Yb ratios, which indicate that the magmas forming the volcanic rocks were derived from lithospheric mantle sources enriched by mostly slab-derived fluids in the spinel stability field. ⁸⁷Sr/⁸⁶Sr_(i) values vary between 0.70485 and 0.70551 and ¹⁴³Nd/¹⁴⁴Nd_(i) values vary between 0.51255 and 0.51267. These data correspond to the mantle array on the isotope ratio diagram. The main solidification processes consist of fractional crystallization with minor assimilation. In light of the data obtained in this study together with data from previous studies, petrogenetic character of the Middle Eocene magmas from the southern parts of the Eastern Pontides may be explained by melting of an enriched lithospheric mantle source initially metasomatized by subduction fluids in a post-collisional extensional-related tectonic setting.</p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"116 5","pages":"379 - 399"},"PeriodicalIF":1.8,"publicationDate":"2022-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4899373","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}