Journal of Geosciences最新文献

{"title":"Molecular structure of the arsenate mineral chongite from Jáchymov – a vibrational spectroscopy study","authors":"J. Sejkora, J. Plášil, J. Čejka, Z. Dolníček, R. Pavlíček","doi":"10.3190/JGEOSCI.292","DOIUrl":"https://doi.org/10.3190/JGEOSCI.292","url":null,"abstract":"We have undertaken a study of the arsenate mineral chongite from the second world occurrence, which is Jáchymov (Czech Republic). Chongite occurs as colourless to white crystalline spherical and hemispherical aggregates up to 0.3 mm across composed of rich crusts on strongly weathered fragments of rocks and gangue. The chemical composition of chongite agrees well with the general stoichiometry of the hureaulite group of minerals and corresponds to the following empirical formula: Ca1.00(Mg1.24Ca0.69 0.06Mn0.01)Σ2.00Ca2.00[(AsO3OH)2.13(AsO4)1.84(PO4)0.03]Σ4.00·4H2O. Chongite is monoclinic, space group C2/c, with the unit-cell parameters refined from X-ray powder diffraction data: a 18.618(5), b 9.421(2), c 9.988(2) Å, β 96.86(2)o and V 1739.4(7) Å3. Raman bands at 3456, 3400, 3194 cm–1 and infrared bands at 3450, 3348, 3201 and 3071 cm–1 are assigned to the ν OH stretching structurally distinct differently hydrogen bonded water molecules. Raman bands at 2887, 2416 cm–1 and infrared bands at 2904, 2783 cm–1 are connected to ν OH stretching in hydrogen bonded (AsO3OH) units. Raman bands at 1656, 1578 cm–1 and infrared bands at 1652, 1601 cm–1 are assigned to the ν2 (δ) H2O bending vibrations of structurally distinct hydrogen bonded water molecules bonded in the structure by H-bonds of various strength. A Raman band at 1284 cm–1 and infrared bands at 1091 and 1061 cm–1 may be connected to the δ As–OH bending vibrations. The most prominent Raman bands at 902, 861, 828, 807, 758 cm–1 and infrared bands at 932, 899, 863, 815, 746 cm–1 are attributed to overlapping ν1 (AsO4) symmetric stretching, ν3 (AsO4) antisymmetric stretching, ν1 (AsO3OH) symmetric stretching, and ν3 (AsO3OH) antisymmetric stretching vibrations. Raman band at 693 cm–1 and infrared bands at 721, 634 cm–1 are assigned to δ AsOH bend and molecular water libration modes. Raman bands 506, 469, 451, 436 cm–1 and infrared bands at 503, 466 and 417 cm–1 are connected with the ν4 (δ) (AsO4) and (HOAsO3) bending vibrations. Raman bands at 389, 360, 346 and 302 cm–1 are related to the ν2 (δ) (AsO4) and (HOAsO3) bending vibrations. Raman bands at 275 and 238 cm–1 are assigned to the ν (OH⋅⋅⋅O) stretching vibrations and those at 190, 162, 110, 100 and 75 cm–1 to lattice modes.","PeriodicalId":15957,"journal":{"name":"Journal of Geosciences","volume":"65 1","pages":"1-10"},"PeriodicalIF":1.4,"publicationDate":"2020-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45481024","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":"Indium-bearing paragenesis from the Nueva Esperanza and Restauradora veins, Capillitas mine, Argentina","authors":"M. F. Márquez-Zavalía, A. Vymazalová, M. A. Galliski, Yasushi Watanabe, H. Murakami","doi":"10.3190/jgeosci.304","DOIUrl":"https://doi.org/10.3190/jgeosci.304","url":null,"abstract":"1 IANIGLA, CCT-Mendoza (CONICET), Avda. A. Ruiz Leal s/n, Parque San Martin, CC330, (5500) Mendoza, Argentina; mzavalia@mendoza-conicet.gov.ar 2 Mineralogía y Petrología, FAD, Universidad Nacional de Cuyo, Centro Universitario (5502) Mendoza, Argentina 3 Department of Rock Geochemistry, Czech Geological Survey, Geologická 6, 152 00 Prague 5, Czech Republic 4 Faculty of International Resource Sciences, Mining Museum of Akita University, 28-2 Osawa, Tegata, Akita, 010-8502 Japan 5 Coal Business Planning Group, Coal Business Office, Resources & Power Company, JXTG Nippon Oil & Energy Corporation, 1-2, Otemachi 1-chome, Chiyoda-ku, Tokyo 100-8162 Japan * Corresponding author","PeriodicalId":15957,"journal":{"name":"Journal of Geosciences","volume":"65 1","pages":"97-109"},"PeriodicalIF":1.4,"publicationDate":"2020-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48180792","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":"Was the Tynong Batholith, Lachlan Orogen, Australia, extremely hot? Application of pseudosection modelling and TitaniQ geothermometry","authors":"K. Regmi, P. Hasalová, I. Nicholls","doi":"10.3190/jgeosci.305","DOIUrl":"https://doi.org/10.3190/jgeosci.305","url":null,"abstract":"Tonalites to granites of the Tynong Batholith, Lachlan Orogen, southeastern Australia as well as enclaves within them contain primary clinoand orthopyroxenes. These plutons produced very broad (2–10 km) contact aureoles that contain an anatectic zone within metagreywackes. The very broad contact aureoles can be related to the 3-D shapes of the plutons and we assume that the Cpx and Opx are remnants of higher temperature crystallization that were preserved due to water loss or low water content in the magma. Estimates of P and T based on x(Fe) values for coexisting cordierite and biotite in P–T pseudosections for a typical migmatitic hornfels, providing minimum temperature of pluton emplacement, indicate emplacement of the Toorongo tonalite at 4–10 km (1–3 kbar) and 680–750 °C. However, the isopleths of An content of plagioclase indicate depths of up to 14 km at 660–740 °C. We suggest that plagioclase was partially re-equilibrated during melt loss and post-emplacement decompression. Cathodoluminescence (CL) imaging shows that quartz both in the tonalites and hornfels is typically zoned from higher Ti contents in cores to lower in the margins, suggesting a response to falling temperature. Calculated temperatures for quartz crystallization using a Ti-in-quartz thermometer calibrated for 2.5 kbar gave a wide range of values between 900 and 500 °C. This suggests that although the granitoids contain two pyroxenes and have produced a broad contact aureole, they were not emplaced at temperatures as high as previously inferred.","PeriodicalId":15957,"journal":{"name":"Journal of Geosciences","volume":"65 1","pages":"121-138"},"PeriodicalIF":1.4,"publicationDate":"2020-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48777646","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":"WinGrt, a Windows program for garnet supergroup minerals","authors":"F. Yavuz, D. Yildirim","doi":"10.3190/jgeosci.303","DOIUrl":"https://doi.org/10.3190/jgeosci.303","url":null,"abstract":"A Microsoft® Visual Basic software, called WinGrt, has been developed to calculate and classify wet-chemical and electron-microprobe garnet supergroup mineral analyses. The program evaluates 33 approved species that belong to the tetragonal henritermierite and isometric bitikleite, schorlomite, garnet and berzeliite groups based on the Commission on New Minerals and Mineral Names (CNMMN) of the International Mineralogical Association (IMA–13) nomenclature scheme. WinGrt also evaluates thirty geothermometers using the Fe2+–Mg exchange reactions for garnet–biotite, garnet–clinopyroxene and garnet–orthopyroxene pairs within the application range of greenschist-, amphibolite-, granuliteand eclogite-facies metamorphic rocks. As naturally occurring garnet is potentially a useful provenance indicator, the program calculates end-member molecules from chemical compositions on the basis of different approaches and yields pyrope, almandine, spessartine, grossular, andradite and schorlomite phase on various ternary discrimination diagrams used in provenance studies. The ferric and ferrous iron contents from total FeO (wt. %) amount are estimated by stoichiometric constraints. The program allows the users to enter 30 input variables including Sample No, SiO2, TiO2, ZrO2, HfO2, Th2O, SnO2, Al2O3, Cr2O3, V2O3, Fe2O3, Mn2O3, Sc2O3, Y2O3 + REE2O3, FeO, MgO, MnO, ZnO, CaO, Na2O, Li2O, P2O5, V2O5, Sb2O5, As2O5, Nb2O5, UO3, Te2O3, F and H2O (wt. %). WinGrt also enables the user to enter the total REE2O3 (wt. %) as input values from La2O3 to Lu2O3 (wt. %) of garnet supergroup mineral analyses in program’s data edit section. WinGrt enables the user to type or load multiple garnet compositions in the data entry section, to edit and load Microsoft® Excel files in calculating, classifying and naming the garnet species, and to store all the calculated parameters in the Microsoft® Excel file for further evaluation.","PeriodicalId":15957,"journal":{"name":"Journal of Geosciences","volume":"65 1","pages":"71-95"},"PeriodicalIF":1.4,"publicationDate":"2020-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48462614","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":"Stangersite, a new tin germanium sulfide, from the Kateřina mine, Radvanice near Trutnov, Czech Republic","authors":"J. Sejkora, E. Makovicky, T. Balić-Žunić, P. Berlepsch","doi":"10.3190/jgeosci.306","DOIUrl":"https://doi.org/10.3190/jgeosci.306","url":null,"abstract":"The new mineral stangersite was found in the burning waste dump of abandoned Kateřina coal mine at Radvanice near Trutnov, northern Bohemia, Czech Republic. The new mineral occurs as well-formed, flattened, acicular crystals with a cross-section of 2–5 × 20–40 μm and up to 1 cm in length. They constitute random or fan-shaped clusters on rock fragments and on crumbly black ash in association with greenockite, herzenbergite, unnamed GeS 2 and GeAsS. Stangersite was also observed as irregular grains, up to 100 μm in size, in the multicomponent aggregates on which the above-described crystals grow. These aggregates are formed, beside stangersite, by minerals of Bi–Sb, Bi 2 S 3 –Sb 2 S 3 and Bi 2 S 3 –Bi 2 Se 3 solid solutions, Bi 3 S 2 , Bi-sulfo/seleno/tellurides, tellurium, unnamed PbGeS 3 , Cd 4 GeS 6 , GeAsS, GeS 2 , Sn 5 Sb 3 S 7 , greenockite, cadmoindite, herzenbergite, teallite and Sn- and/or Se-bearing galena. Stangersite formed under reducing conditions by direct crystallization from hot gasses (250–350 °C) containing Cl and F, at a depth of 30–60 cm under the surface of the (100) layers of Sn 2+ S 5 coordination pyramids and with interspaces filled by lone electron pairs of Sn 2+ and [001] chains of Ge 4+ S 4 coordination tetrahedra. The Raman spectrum of stangersite with tentative band assignments is given. We named the mineral after its chemical constituents: Sn ( stan num), Ge ( ger manium) and S ( s ulphur).","PeriodicalId":15957,"journal":{"name":"Journal of Geosciences","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2020-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46934918","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 word of the retiring Editor-in-Chief & A word of the newly-coming Editor-in-Chief: (Not such) significant changes in the editorial board","authors":"V. Janoušek, J. Plášil","doi":"10.3190/jgeosci.311","DOIUrl":"https://doi.org/10.3190/jgeosci.311","url":null,"abstract":"","PeriodicalId":15957,"journal":{"name":"Journal of Geosciences","volume":"65 1","pages":""},"PeriodicalIF":1.4,"publicationDate":"2020-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46748840","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":"Pošepnýite, a new Hg-rich member of the tetrahedrite group from Příbram, Czech Republic","authors":"P. Škácha, J. Sejkora, J. Plášil, E. Makovicky","doi":"10.3190/jgeosci.308","DOIUrl":"https://doi.org/10.3190/jgeosci.308","url":null,"abstract":"1 Mining muzeum Příbram, Hynka Kličky place 293, Příbram VI, 261 01, Czech Republic 2 Department of Mineralogy and Petrology, National Museum, Cirkusová 1740, Prague 9-Horní Počernice, 193 00, Czech Republic; jiri_sejkora@nm.cz 3 Institute of Physics ASCR, v.v.i., Na Slovance 1999/2, 182 21 Praha 8, Czech Republic 4 Institute for Geoscience and Natural Resources Managment, University of Copenhagen, Østervolgade 10, DK-1350, Copenhagen K, Denmark * Corresponding author","PeriodicalId":15957,"journal":{"name":"Journal of Geosciences","volume":" ","pages":""},"PeriodicalIF":1.4,"publicationDate":"2020-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45454407","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":"The petrostructural characteristics and 207Pb/206Pb zircon data from the Ngomedzap-Akongo area (Nyong complex, SW-Cameroon)","authors":"S. Owona, J. M. Ondoa, M. Tichomirowa, G. Ekodeck","doi":"10.3190/jgeosci.309","DOIUrl":"https://doi.org/10.3190/jgeosci.309","url":null,"abstract":"Herein, we constrain the Ngomedzap–Akongo geodynamic evolution in the eastern part of the Nyong complex (NyC) in SW Cameroon that belongs to the Paleoproterozoic West Central African Fold Belt (WCAF) through petrostructural field observations, laboratory analyses, and 207Pb/206Pb zircon geochronology. It consists of magnetite bearing quartzite, metagranodiorite, metaanorthosite, metagabbro, and metasyenites that have recorded a polyphase D1–D3 deformation. D1, likely a pure shear-type, has been strongly overprinted by the D2 transpression flow regime that emplaced the Nyong tectonic nappe, transported top – to the East onto the Congo shield. This nappe is dissected by D3 blastomylonitic shear-zones. Both the D2 and D3 have controlled the actual geometry of the Nyong belt, later crosscut by D4 multiple brittle tectonic styles, likely post-orogenic. Zircon geochronology yielded 207Pb/206Pb zircon geochronology protolith Archean mean ages of 2764 ± 26 Ma (MSWD = 0.81) in metagranodiorite; 2816 ± 34 Ma (MSWD = 1.3) and 2789 ± 13 Ma (MSWD = 0.28) in metasyenites. These new data corroborate old ones and, together, document the Archean origin of the NyC as details of the Nyong fold-and-thrust belts that of WCAFB and South American homologous due to the colliding Congo-San Francisco shields associated with Eburnean/Trans Amazonian orogeny (~2100–2050 Ma).","PeriodicalId":15957,"journal":{"name":"Journal of Geosciences","volume":"65 1","pages":"201-219"},"PeriodicalIF":1.4,"publicationDate":"2020-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49149048","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":"New crystal-chemical data on zincoberaunite from Krásno near Horní Slavkov (Czech Republic)","authors":"J. Tvrdý, J. Plášil, R. Škoda","doi":"10.3190/jgeosci.296","DOIUrl":"https://doi.org/10.3190/jgeosci.296","url":null,"abstract":"A study of zincoberaunite from Krásno near Horní Slavkov (Czech Republic) provided new chemical and structural data of this rare member of the beraunite group. The studied material is monoclinic, space group C2/c, with a = 20.3440(19) Å, b = 5.1507(3) Å, c = 19.1361(15) Å, β = 93.568(8)°, V = 2001.3(3) Å3, Z = 4. Based on refined site occupancies and bond-valence considerations, the structural formula is (Zn0.81Al0.19)(OH)2(Fe0.61Al0.39)(OH)2(H2O)2(Fe1.52Al0.48)(H2O)2(Fe1.72Al0.28) (OH)(PO4)3.83(AsO4)0.17(H2O)2. Electron-microprobe analyses support the obtained results. However, keeping the same cation occupancy at the M2–M4 sites, the ratio of Al3+ to Me2+ at the M1 site requires the presence of divalent cations as follows: (Zn0.57Fe0.24Al0.19)Σ1.00(Fe3.85Al1.15)Σ5.00[(PO4)3.89(AsO4)0.10(SiO4)0.01]Σ4.00[(OH)4.59F0.24 O0.17]Σ5.00(OH2)4.00·2H2O. Individual prismatic zincoberaunite crystals exhibit a chemical zonation manifested by increasing Fe and decreasing Zn and Al contents from cores to rims. The mineral composition is close to the Zn–Al-rich members of the beraunite group known from the same locality, but in this case, dominant occupancy of Zn at the M1 site was confirmed. With its increased aluminium content, zincoberaunite from Krásno differs significantly from the holotype specimen described from Hagendorf South pegmatite in Germany. The most prominent Raman bands are in good agreement with data published for related members of the beraunite group. Structure refinement (R = 3.56 % for 1906 observed unique reflections) revealed three different types of OH or H2O, which play distinct role in structure bonding.","PeriodicalId":15957,"journal":{"name":"Journal of Geosciences","volume":"65 1","pages":"45-57"},"PeriodicalIF":1.4,"publicationDate":"2020-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49545909","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":"Activation energy of annealed, partially metamict davidite by 57Fe Mössbauer spectroscopy","authors":"D. Malczewski, A. Grabias, M. Dziurowicz","doi":"10.3190/jgeosci.298","DOIUrl":"https://doi.org/10.3190/jgeosci.298","url":null,"abstract":"","PeriodicalId":15957,"journal":{"name":"Journal of Geosciences","volume":"65 1","pages":"37-44"},"PeriodicalIF":1.4,"publicationDate":"2020-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41515981","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}