Mineralogy and Petrology最新文献

{"title":"Interpretation of wide zircon U–Pb age distributions in durbachite-type Variscan granitoid in the Mórágy Hills","authors":"Annamária Kis,&nbsp;Tamás G. Weiszburg,&nbsp;István Dunkl,&nbsp;Friedrich Koller,&nbsp;Tamás Váczi,&nbsp;György Buda","doi":"10.1007/s00710-023-00817-2","DOIUrl":"10.1007/s00710-023-00817-2","url":null,"abstract":"<div><p>In situ U–Pb analyses were performed on SEM-BSE, SEM-CL and Raman mapped zircons from the Variscan granitoids exposed in the Mórágy pluton, Hungary. However, the routinely used LA-ICP-MS could result only in reliable age constraints if the system was not overprinted by multiple geological processes that affect the isotope system of zircons. To overcome the ambiguities the new zircon U–Pb age data were evaluated carefully, first using simple statistical models, then a zircon internal texture related complex approach was applied. This method demonstrates that the U–Pb age in overprinted systems correlates with the structural state; the worse structural state zones showing younger, but still concordant ages. Individual zircon internal texture and structural state based evaluation made it possible to select the least overprinted age components of the system and identify five steps in the evolution of the studied intrusive rock. The two melts (granitoid and mafic) passed the zircon U–Pb isotope closure temperature ~ 355 ± 3 Ma ago during their cooling. Crystallization of the two mingled magmas overarched the 350–340 Ma period, including two intense zircon crystallization peaks (~ 347 Ma, ~ 333 Ma). The cessation of melt crystallization (~ 650 °C) happened ~ 334 ± 4 Ma ago, as indicated by the age of the “normal and long prismatic” zircons. Further confirming this statement, they are embedding in their rims the eutectic mineral assemblage. A Cretaceous post-magmatic event was identified according to slightly discordant U–Pb ages for the Mórágy pluton.</p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"117 4","pages":"663 - 683"},"PeriodicalIF":1.4,"publicationDate":"2023-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00710-023-00817-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47079364","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":"The flexibility of the T–X–T hinges between the coordination tetrahedra in various zeolitic frameworks: an empirical structural study","authors":"Werner H. Baur,&nbsp;Reinhard X. Fischer","doi":"10.1007/s00710-023-00813-6","DOIUrl":"10.1007/s00710-023-00813-6","url":null,"abstract":"<div><p>In recent years, a large number of precisely determined crystal structure determinations of zeolites, that is compounds based on open frameworks of coordination tetrahedra, has accumulated. This gives us the opportunity to evaluate them in terms of the flexibility of their bond angles T–X–T which serve as hinges between the coordination tetrahedra in zeolites containing various SiO₄, AlO₄, PO₄ and similarly sized ions. Out of about 7,000 known crystal structure descriptions of zeolites we have selected 1187 which are based on single crystal diffraction studies and have estimated standard deviations of their T–O bond length of 0.01 Å or less. The mean Si–O–Si angle in zeolitic frameworks with T-sites fully occupied by one type of T atoms is 152.9° and these angles range from 127.0° to 180°, the mean for Al–O–Si is 141.9°, ranging from 124.8° to 179.3°. Straight angles Si–O–Si do occur in some zeolites.</p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"117 2","pages":"165 - 179"},"PeriodicalIF":1.8,"publicationDate":"2023-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00710-023-00813-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4797928","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":"K[(CuII,MnII,MnIII)2(TeO3)3]∙2H2O, the first zemannite-type structure based on a Jahn-Teller-distorted framework","authors":"Felix Eder,&nbsp;Ronald Miletich,&nbsp;Matthias Weil","doi":"10.1007/s00710-022-00808-9","DOIUrl":"10.1007/s00710-022-00808-9","url":null,"abstract":"<div><p>Synthetic single crystals of K[(Cu^II,Mn^II,Mn^III)₂(TeO₃)₃]·2H₂O were obtained from an overconcentrated alkaline aqueous solution in the system K₂O-MnO-CuO-TeO₂ under hydrothermal conditions at <i>T</i> ≤ 220 °C. Subeuhedral single crystals have been investigated by means of single-crystal X-ray diffraction. The crystal structure of this new zemannite-type representative adopts a monoclinic twofold superstructure. The doubling of the unit-cell volume is accompanied by a hexagonal-to-monoclinic symmetry reduction, resulting in threefold twinning with individual crystal domains following the space group symmetry <i>P</i>2₁. Refinements of site-occupation factors and the evaluation of bond valences suggest a distribution of di- and trivalent cations at the octahedrally coordinated <i>M</i> sites with a ratio (Cu^II + Mn^II):Mn^III approximating 1:1. Based on arguments about the cation sizes and the individual bond valence sums, a distribution of Cu^II_1–<i>x</i>Mn^III_<i>x</i> and Mn^II_<i>x</i> Mn^III_1–<i>x</i> at each two of the four <i>M</i> sites can be assumed with <i>x</i> between ~ 0.14 and ~ 0.50. The K⁺ cations and H₂O molecules inside the channels are located off the central channel axis. In contrast to most other known zemannite-type phases, the extra-framework atoms show full occupancies and are not disordered. The distribution of the channel contents supports the anisotropic deformation of the surrounding framework, which follows the local symmetry reduction as required for the Jahn-Teller distortion of the octahedrally coordinated <i>M</i> sites within the framework. The arrangement of the deformed channels can be understood as the origin of the existing superstructure.</p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"117 2","pages":"133 - 143"},"PeriodicalIF":1.8,"publicationDate":"2023-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00710-022-00808-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4727651","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":"On the security of graphite supply","authors":"Leopold Weber","doi":"10.1007/s00710-023-00816-3","DOIUrl":"10.1007/s00710-023-00816-3","url":null,"abstract":"<div><p>In order to achieve the ambitious goals vital to successfully combat global warming, new methods for the generation, storage and transport of renewable energy as well as for electromobility are required. In most cases such methods are resource-intensive. For example, graphite is expected to grow by ca. 500% by 2050. It is therefore legitimate to inquire into how reliably raw materials can be supplied. Raw material forecasts cannot be derived with sufficient certainty from production data only. To be able to look into the future, it is necessary to use deposit-specific resource data. Using the example of graphite, analyzes have shown that although there is no reason to fear a physical shortage of graphite, political influence or problems with the development of new deposits due to insufficient environmental protection measures can noticeably impact the security of supply.</p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"117 2","pages":"387 - 399"},"PeriodicalIF":1.8,"publicationDate":"2023-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00710-023-00816-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4727640","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":"Are the [6]-coordinated sites in tourmaline in certain cases partially vacant?","authors":"Andreas Ertl","doi":"10.1007/s00710-023-00815-4","DOIUrl":"10.1007/s00710-023-00815-4","url":null,"abstract":"<div><p>Tourmaline has two different [6]-coordinated sites, the Y site and the Z site. Vacancies were reported from both sites. Based on high-quality chemical and single-crystal structural data it usually needs increasing proportions of short-range order configurations Na(Al₂<b>□</b>)Al₆(BO₃)₃[Si₆O₁₈]^V(OH)₃^W(OH) or Na(Al₂<b>□</b>)Al₆(BO₃)₃[Si₆O₁₈]^V(OH)₃^WF in order to produce Y-site vacancies (with <b>□</b> being the symbol for a vacant site). Less commonly, the short-range configuration Ca(Al₂<b>□</b>)Al₆(BO₃)₃[Si₅T³⁺O₁₈]^V(OH)₃^W(OH) could occur in Al-rich tourmalines with a Si deficiency, where T³⁺  = B, Al. Therefore, tourmalines enriched in cations with charge 2 + (Fe²⁺, Mn²⁺, Mg) contain only insignificant Y-site vacancies. Aluminum-rich tourmalines with ≥ 7.0 apfu Al_total that usually contain ≥ 0.2 apfu Li may have significant vacancies at the Y site. However, no more than 12% vacancies (0.36 pfu) at the Y site can be observed in such samples. If no chemical data for Li is available it is proposed to calculate the Li content in such colourless or coloured tourmalines (elbaite, fluor-elbaite, fluor-liddicoatite, rossmanite) for Y = 2.8 apfu or for Y + Z + T = 14.8 apfu, because this calculation should give more accurate results than calculating the Li content as the difference to 3.0 apfu at the Y site. For Fe²⁺-rich and Mg-bearing tourmalines from the schorl-dravite series with MgO &gt; 1.0 wt% (and only minor amounts of Fe³⁺, Cr³⁺ and V³⁺) the structural formula can still be calculated for Y + Z + T = 15 apfu, because such tourmalines do not appear to contain significant Y-site vacancies. It can further be concluded that the Z site could be only ≤ 1% vacant and therefore such vacancies would be insignificant even in Al-rich tourmaline.</p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"117 2","pages":"201 - 207"},"PeriodicalIF":1.8,"publicationDate":"2023-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00710-023-00815-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4853334","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":"Ordovician arc and syncollisional magmatism in the İstanbul-Zonguldak Tectonic Unit (NW Turkey): Implications for the consumption of the Teisseyre-Tornquist Ocean in Far East Avalonia","authors":"Fatih Şen","doi":"10.1007/s00710-023-00812-7","DOIUrl":"10.1007/s00710-023-00812-7","url":null,"abstract":"<div><p>The İstanbul-Zonguldak Tectonic Unit is an Amazonia-derived continental fragment added to Baltica during the middle Paleozoic, and represents Far East Avalonia. The soft-docking time of two continental blocks, thus the consumption of the Teisseyre-Tornquist Ocean, is poorly known. This paper reports biotite-bearing dacite and pyroxene-bearing basaltic andesite and dacite dykes of Ordovician igneous crystallization ages in the İstanbul-Zonguldak Tectonic Unit (NW Turkey). They have porphyritic to spherulitic textures. U–Pb dating on igneous zircons from arc- and syncollisional-related dykes yielded Ordovician ages of ca. 484.1 ± 2.5 Ma (2σ) and 444.4 ± 3.7 to 443.0 ± 2.1 Ma (2σ). They display calc-alkaline signatures and are noteworthy with subduction components, as deduced by the presence of marked negative Nb anomalies. Biotite-bearing dykes intruded to it in an arc setting whereas pyroxene-bearing dykes emplaced into it in a syncollisional setting. Besides, Middle-Late Ordovician granites (c. 464–446 Ma) intruding the high-grade metamorphic rocks, known as rift-related intrusions in previous studies, show calc-alkaline affinities and contain subduction components, and they formed in a volcanic arc. I suggest that Early-Late Ordovician magmatism is related to the Teisseyre-Tornquist Ocean subducting under Far East Avalonia, and Late Ordovician magmatism is associated with soft-docking between two continental blocks, thus the destruction of the Teisseyre-Tornquist Ocean. Overall, its suture in Far East Avalonia overlaps with the Vardar suture in Balkans, and it can be traced from İzmir to Söğüt in Anatolia and represents the missing part in Far East Avalonia.</p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"117 4","pages":"639 - 661"},"PeriodicalIF":1.4,"publicationDate":"2023-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48849735","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":"CuSeO4 and Cu(SeO3OH)2·6H2O, two novel copper–selenium(VI) oxysalts","authors":"Herta S. Effenberger,&nbsp;Gerald Giester,&nbsp;Manfred Wildner","doi":"10.1007/s00710-022-00809-8","DOIUrl":"10.1007/s00710-022-00809-8","url":null,"abstract":"<div><p>The two new copper(II) salts Cu(SeO₄) and Cu(SeO₃OH)₂·6H₂O were synthesized at low-temperature hydrothermal conditions (220 °C), and room temperature, respectively. Their atomic arrangements were studied based on single-crystal X-ray investigations [<i>P</i>2₁/<i>n, a</i> = 4.823(1), <i>b</i> = 8.957(2), <i>c</i> = 6.953(1) Å, β = 94.82(1)°, Z = 4; <span>(P{overline 1})</span>, <i>a</i> = 6.133(1), <i>b</i> = 6.303(1), <i>c</i> = 8.648(2) Å, α = 70.45(1), β = 84.60(1), γ = 73.44(1)°, Z = 1]. Cu(SeO₄) adopts the MnAsO₄ structure type. It exhibits structural as well as topological relations with two formerly known isochemical compounds. They crystallize in the structure type ZnSO₄ (mineral name zincosite, <i>Pnma</i>) respectively NiSO₄ (<i>Cmcm</i>). The two minerals dravertite, CuMg(SO₄)₂, and hermannjahnite, CuZn(SO₄)₂, are isotypic with CuSeO₄-<i>P</i>2₁/<i>n;</i> interestingly, also α-NaCu(PO₄) belongs to this structure type: some rotation of the <i>X</i>O₄ group allows a supplementary position for the Na atom. — Cu(SeO₃OH)₂·6H₂O represents a new structure type. The protonated selenate group shows an extended Se—O_<i>h</i> bond distance (1.695 Å) as compared to the other Se—O bonds (1.614 to 1.626 Å). One OH dipole of the three independent H₂O molecules represents a rather free hydrogen bond. For the other H atoms, the O—H···O lengths vary from 2.585 to 2.799 Å. Interestingly, the distance O_<i>w</i>7···O_<i>w</i>7 of only 2.791 Å does not represent an edge in a coordination polyhedron and it is not preliminary involved in the hydrogen bond scheme. All Cu²⁺ ions in the two title compounds are in a pronounced [4 + 2] coordination. The Cu^2+[4+2] atoms in Cu(SeO₄) are linked to chains along [100]; in Cu(SeO₃OH)₂·6H₂O they are not connected among each other.\u0000</p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"117 2","pages":"307 - 315"},"PeriodicalIF":1.8,"publicationDate":"2023-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00710-022-00809-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"5084817","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":"A crystal structure refinement of uralolite, Ca2Be4(PO4)3(OH)3∙5H2O, from Weinebene, Austria","authors":"Kurt Mereiter,&nbsp;Franz Walter","doi":"10.1007/s00710-022-00806-x","DOIUrl":"10.1007/s00710-022-00806-x","url":null,"abstract":"<div><p>The crystal structure of uralolite, Ca₂Be₄(PO₄)₃(OH)₃·5H₂O, from the spodumene deposit of Weinebene, Carinthia, Austria, has been refined with X-ray single crystal data gathered on a CCD diffractometer. Uralolite is monoclinic, space group <i>P</i>2₁/<i>n</i>, <i>a</i> = 6.553(1), <i>b</i> = 16.005(3), <i>c</i> = 15.979(3) Å, <i>β</i> = 101.63(1)°, <i>V</i> = 1641.5(5) ų. While previously only isotropic displacement parameters and no hydrogen atom positions were reported for uralolite, now anisotropic displacement parameters were used for non-hydrogen atoms and hydrogen atoms were located and refined yielding <i>R</i>₁ = 0.038 for 3909 observed reflections. Uralolite is built up from corrugated layers [Be₄(PO₄)₃(OH)₃]^4- parallel to (010), which contain Z-shaped groups of four BeO₄ tetrahedra sharing corners via three OH groups and are further crosslinked by PO₄ tetrahedra. Two Ca atoms in Ca(O_phosphate)₅(H₂O)₂ coordination and an interstitial water molecule link these layers along [010]. The OH groups and the Ca-bonded H₂O molecules are all involved in hydrogen bonds with O···O distances of 2.780(2) − 3.063(2) Å and O-H···O angles of 150(1) − 179(1)° excluding a bifurcated bond. The interstitial water molecule displays a distorted tetrahedral environment of O atoms and accepts and donates each two hydrogen bonds. The crystal structure exhibits a <i>C</i>2/<i>c</i> pseudosymmetry for the [Be₄(PO₄)₃(OH)₃]^4- layers and the Ca atoms. However, the disposition of the water molecules and an asymmetric hydrogen bond pattern involving OH groups as well as H₂O molecules are decisive for the lowering of the symmetry of the structure to the true space group <i>P</i>2₁/<i>n.</i></p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"117 2","pages":"181 - 189"},"PeriodicalIF":1.8,"publicationDate":"2023-02-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00710-022-00806-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4570829","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":"Ba-rich phlogopite, dissakisite-(Ce), and fluorine-rich clinohumite in granulite-facies marbles from the In Ouzzal terrane, Western Hoggar, Algeria","authors":"Nadia Boureghda,&nbsp;Khadidja Ouzegane,&nbsp;Saïda Aït-Djafer,&nbsp;Abderrahmane Bendaoud,&nbsp;Basem A. Zoheir,&nbsp;Jean-Robert Kienast","doi":"10.1007/s00710-022-00802-1","DOIUrl":"10.1007/s00710-022-00802-1","url":null,"abstract":"<div><h2>Abstract\u0000</h2><div><p>Granulite-facies marbles are part of the Archaean crust of the In Ouzzal terrane (Western Hoggar). Besides calcite and dolomite, these marbles are characterized by forsterite, spinel, phlogopite, diopside, amphibole, and magnetite. High-Mn ilmenite (MnO: 19.43 wt%), pyrophanite (MnO: 25.83 wt%), dissakisite-(Ce) (containing 12.2–14.38 Ce₂O₃ wt% and 8.3–12.3 wt% La₂O₃), F-rich clinohumite and Ba-rich-phlogopite occur locally. Ilmenite-pyrophanite and Ba-rich phlogopite (BaO: 11.68 wt%) are interpreted to be resulted of the hydrothermal processes during carbonate deposition; whereas, dissakisite-(Ce) is inferred to have resulted from light rare earth element (LREE) enrichment of these marbles by fluids released from the syenite intrusions. Clinohumite with X_Mg [= Mg/(Mg + Fe)] of 0.89–0.91, generated by hydration of forsterite-bearing dolomitic marbles, has the highest fluorine contents ever reported in the literature (3.25–4.62 wt%), resulting in a F/(F + OH) ratio as high as 0.8. Clinohumite is the only phase incorporating F where phlogopite, amphibole and apatite are absent. Thus, all the F present in the rock would be concentrated in clinohumite, resulting in extreme fluorine enrichment in some grains.</p></div></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"117 1","pages":"99 - 111"},"PeriodicalIF":1.8,"publicationDate":"2023-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4451492","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":"A new A-type granitoid occurrence in southernmost Fennoscandia: geochemistry, age and origin of rapakivi-type quartz monzonite from the Pietkowo IG1 borehole, NE Poland","authors":"Anna Grabarczyk,&nbsp;Janina Wiszniewska,&nbsp;Ewa Krzemińska,&nbsp;Zdzisław Petecki","doi":"10.1007/s00710-022-00799-7","DOIUrl":"10.1007/s00710-022-00799-7","url":null,"abstract":"<div><h2>Abstract\u0000</h2><div><p>Rapakivi-type quartz monzonite and the underlying dark-grey granodiorite from the Pietkowo IG1 borehole, in the Polish part of southernmost Fennoscandia have been investigated using whole-rock geochemistry, Sm–Nd isotope geochemistry and U–Pb zircon dating. The quartz monzonite was emplaced at 1495–1491 Ma, although slightly older zircon cores (antecrysts) of 1513 Ma imply a two-stage crystallization. The geochemical similarities with Mazury Complex granitoids, their metaluminous and alkali-calcic nature, elevated contents of F, Ga and high-field-strength-elements (HFSE), indicate that the Pietkowo IG1 rapakivi-type quartz monzonite is an ‘A-type’ granitoid. The presence of magnetite and titanite indicates crystallization under oxidizing conditions. The rock is classified as A₂ sub-type, and the Nb/Y ratio implies a within-plate setting. The dark-grey granodiorite, dated to 1813 Ma, has a calc-alkaline character, typical of a volcanic-arc environment. Initial whole rock ε_Nd values range between -2.9 and -3.3 for the rapakivi-type quartz monzonite and from -1.0 to + 1.1 for the dark-grey granodiorite. We suggest that the A-type Pietkowo IG1 rapakivi-type quartz monzonite was generated from the dark-grey granodiorite via partial melting at middle to lower crustal levels. The most plausible ascent route for the quartz monzonite was via lithospheric-scale weakness zones, between the eastern margin of the Mazowsze Domain and Belarus-Podlasie Granulite Belt, i.e., the Białystok fault. Therefore, the Pietkowo IG1 rapakivi-type quartz monzonite is a representative of the Mesoproterozoic A-type granitoid occurrence in southernmost Fennoscandia.</p></div></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"117 1","pages":"1 - 25"},"PeriodicalIF":1.8,"publicationDate":"2023-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00710-022-00799-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4571737","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}