Mineralogy and Petrology最新文献

{"title":"Structural studies on synthetic A2−x[M2(TeO3)3]·nH2O phases (A = Na, K, Rb, Cs; M = Mn, Co, Ni, Cu, Zn) with zemannite-type structures","authors":"Felix Eder,&nbsp;Alexandre Marsollier,&nbsp;Matthias Weil","doi":"10.1007/s00710-023-00814-5","DOIUrl":"10.1007/s00710-023-00814-5","url":null,"abstract":"<div><p>During a systematic study on formation conditions of new compounds with zemannite-type structures, crystals of ten new oxidotellurate(IV) phases were grown under hydrothermal conditions, partially by employing a drastic reduction of the water content. The crystal structures of the obtained phases were determined by single-crystal X-ray diffraction. Na₂[Ni₂(TeO₃)₃]·2.5H₂O, K₂[Ni₂(TeO₃)₃]·H₂O, K₂[Zn₂(TeO₃)₃]·2H₂O, Rb_1.25[Co₂(TeO₃)₃]·1.5H₂O and Rb_1.24[Mn₂(TeO₃)₃]·2H₂O exhibit a unit-cell with hexagonal symmetry (<i>Z</i> = 2, <i>a</i> ≈ 9.3 Å,<i> c</i> ≈ 7.7 Å), in which most of the other compounds with a zemannite-type structure are known to crystallize. Relative to this unit-cell, K₂[Cu₂(TeO₃)₃]·2H₂O exhibits a twofold superstructure, K₂[Co₂(TeO₃)₃]·2.5H₂O a twofold superstructure with an additional incommensurate modulation, Na₂[Cu₂(TeO₃)₃]·1.5H₂O a threefold superstructure, and Rb_1.5[Mn₂(TeO₃)₃]·1.25H₂O and Cs[Mn₂(TeO₃)₃]·H₂O a fourfold superstructure. Disorder of the alkali metal cations and crystal water molecules in the channels as well as variable water contents complicate modelling and structure refinement.</p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"117 2","pages":"145 - 163"},"PeriodicalIF":1.8,"publicationDate":"2023-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00710-023-00814-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4595968","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":"Katsarosite Zn(C2O4)·2H2O, a new humboldtine-group mineral from the Lavrion Mining District, Greece","authors":"Gerald Giester,&nbsp;Branko Rieck,&nbsp;Christian L. Lengauer,&nbsp;Uwe Kolitsch,&nbsp;Lutz Nasdala","doi":"10.1007/s00710-023-00810-9","DOIUrl":"10.1007/s00710-023-00810-9","url":null,"abstract":"&lt;div&gt;&lt;p&gt;Katsarosite, ideally Zn(C&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt;)·2H&lt;sub&gt;2&lt;/sub&gt;O, named for Īraklīs Katsaros, is a new mineral found at the Esperanza Mine in the Kaminiza area of the Lavrion Mining District, Greece. Katsarosite usually occurs directly on sphalerite or embedded in jarosite and/or hydrozincite, often intimately intergrown with gypsum and overgrown by goslarite and/or epsomite. Crystal aggregates are mostly fine granular to earthy, with individual crystals being usually rounded with an average diameter of 30 µm, sometimes prismatic along [001] or platy, exhibiting the indistinct forms {100}, {001}, {110}, and {101}. Katsarosite is malleable with a Mohs hardness of 1½ – 2 and exhibits a perfect cleavage on {110}; the fracture is uneven in all other directions. The colour depends on the iron (Fe&lt;sup&gt;2+&lt;/sup&gt;) content, ranging from pure white in almost Fe-free samples to yellow in Fe-rich specimens. It has a resinous luster and a white streak; no luminescence has been observed under either short- or long-wave ultraviolet radiation. Katsarosite is optically biaxial (+). Refractive indices measured at a wavelength of 589 nm are &lt;i&gt;n&lt;/i&gt;&lt;sub&gt;α&lt;/sub&gt; = 1.488(2), &lt;i&gt;n&lt;/i&gt;&lt;sub&gt;β&lt;/sub&gt; = 1.550(2), &lt;i&gt;n&lt;/i&gt;&lt;sub&gt;γ&lt;/sub&gt; = 1.684(2), with 2&lt;i&gt;V&lt;/i&gt;&lt;sub&gt;obs&lt;/sub&gt; = 71(3)°. Chemical analysis gave on average C&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;3&lt;/sub&gt; 38.32 wt%, ZnO 38.99 wt%, FeO 1.92 wt%, and H&lt;sub&gt;2&lt;/sub&gt;O 19.04 wt% (the latter was deduced based on the crystal-structure refinement), with traces of MgO and MnO. The new mineral is readily soluble in dilute acids. Katsarosite is monoclinic, space group &lt;i&gt;C&lt;/i&gt;2/&lt;i&gt;c&lt;/i&gt;, with unit-cell parameters &lt;i&gt;a&lt;/i&gt; = 11.768(3), &lt;i&gt;b&lt;/i&gt; = 5.3882(12), &lt;i&gt;c&lt;/i&gt; = 9.804(2) Å, &lt;i&gt;β&lt;/i&gt; = 127.045(8)°, &lt;i&gt;V&lt;/i&gt; = 496.2(2) Å&lt;sup&gt;3&lt;/sup&gt; (&lt;i&gt;Z&lt;/i&gt; = 4). The strongest lines in the Gandolfi X-ray powder pattern [&lt;i&gt;d&lt;/i&gt;&lt;sub&gt;obs&lt;/sub&gt; in Å, &lt;i&gt;I&lt;/i&gt;&lt;sub&gt;obs&lt;/sub&gt;/&lt;i&gt;I&lt;/i&gt;&lt;sub&gt;100&lt;/sub&gt;, (&lt;i&gt;hkl&lt;/i&gt;)] are: 4.6745, 100, (200); 4.7678, 94, (20&lt;span&gt;(overline{2 })&lt;/span&gt;); 2.9533, 51, (40&lt;span&gt;(overline{2 })&lt;/span&gt;); 4.7030, 37, (1 &lt;span&gt;(overline{1 },overline{1 })&lt;/span&gt;); 3.9266, 33, (002); 3.5686, 27, (111); 2.6574, 22, (1 &lt;span&gt;(overline{1 },overline{3 })&lt;/span&gt;); 3.5992, 8, (1 &lt;span&gt;(overline{1 },overline{2 })&lt;/span&gt;); 2.7032, 4, (020). The crystal structure was refined based on single-crystal X-ray diffraction data to &lt;i&gt;R&lt;/i&gt;(&lt;i&gt;F&lt;/i&gt;) = 0.08. The observed mass density of 2.50(2) g cm&lt;sup&gt;−3&lt;/sup&gt; compares well with the calculated value (2.508 g cm&lt;sup&gt;−3&lt;/sup&gt;). Katsarosite belongs to the humboldtine group, whose crystal-structure type is well described for both isotypic minerals and synthetic compounds in the literature. The atomic arrangement in Zn(C&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt;)·2H&lt;sub&gt;2&lt;/sub&gt;O is characterized by chains consisting of isolated ZnO&lt;sub&gt;6&lt;/sub&gt; octahedra which are alternately linked along [010] via oxalate anions. These chains are interconnected through hydrogen bonds only, with Ow···O (with Ow denoting the O atom of the ","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"117 2","pages":"259 - 267"},"PeriodicalIF":1.8,"publicationDate":"2023-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00710-023-00810-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"4445542","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":"Petrogenetic and geodynamic evolution of plutonic rocks from the Chadormalu district, Kashmar-Kerman tectonic zone, Central Iran","authors":"Niloofar Nayebi,&nbsp;Dariush Esmaeily,&nbsp;Ryuichi Shinjo,&nbsp;Reza Deevsalar,&nbsp;Soroush Modabberi,&nbsp;Bernd Lehmann","doi":"10.1007/s00710-023-00811-8","DOIUrl":"10.1007/s00710-023-00811-8","url":null,"abstract":"<div><p>Late Precambrian–Early Paleozoic igneous rocks constitute volumetrically minor components of the Iranian Plateau but preserve important information about the magmatic and tectonic history of the northern Gondwana margin. The Chadormalu intrusions are part of Central Iran, which includes Late Precambrian–Early Paleozoic continental crust that is now embedded in the Alpine-Himalayan orogenic system. New zircon U-Pb and Sr-Nd-Pb isotope data and whole-rock geochemical analyses are presented on gabbroic to granitic rocks of the Chadormalu district to constrain the magmatic history of the Cadomian orogeny in a disrupted fragment of the northern Gondwana margin. The geochemical data identify I-type calc-alkaline magmatism with typical continental-arc features. The laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) U-Pb zircon ages range from 531.1 ± 1.6 Ma to 539.8 ± 2.2 Ma, consistent with previous data on the Cadomian basement of Central Iran, and document Early Cambrian subduction and extension along northern Gondwana. Whole rock Sr-Nd isotope data for gabbro (ɛNd_i= 0.4; i stands for initial; t = 533 Ma) and granites (ɛNd_i= -3.6 to -3.0; t = 531–539 Ma) along with radiogenic Pb isotope data attest to melting of older continental crust triggered by mantle melts. The subduction regime was followed by slab retreat ± delamination in an extensional environment which allowed Ediacaran-early Cambrian flare up of magmatism along the northern Gondwana margin at a regional scale.</p></div>","PeriodicalId":18547,"journal":{"name":"Mineralogy and Petrology","volume":"117 4","pages":"619 - 637"},"PeriodicalIF":1.4,"publicationDate":"2023-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42342724","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":"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}