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CHEMISTRY (598 journals)                  1 2 3 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
2D Materials     Hybrid Journal   (Followers: 8)
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 26)
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Acta Chemica Iasi     Open Access   (Followers: 2)
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Acta Chromatographica     Full-text available via subscription   (Followers: 9)
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Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
Acta Scientifica Naturalis     Open Access   (Followers: 2)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 5)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 7)
Adsorption Science & Technology     Full-text available via subscription   (Followers: 5)
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African Journal of Bacteriology Research     Open Access  
African Journal of Chemical Education     Open Access   (Followers: 2)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 7)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 3)
AMB Express     Open Access   (Followers: 1)
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American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 67)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 14)
American Journal of Chemistry     Open Access   (Followers: 26)
American Journal of Plant Physiology     Open Access   (Followers: 13)
American Mineralogist     Hybrid Journal   (Followers: 13)
Analyst     Full-text available via subscription   (Followers: 38)
Angewandte Chemie     Hybrid Journal   (Followers: 164)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 212)
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Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 14)
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Arabian Journal of Chemistry     Open Access   (Followers: 6)
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Atomization and Sprays     Full-text available via subscription   (Followers: 3)
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Boletin de la Sociedad Chilena de Quimica     Open Access  
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 2)
Bulletin of the Chemical Society of Japan     Full-text available via subscription   (Followers: 24)
Bulletin of the Korean Chemical Society     Hybrid Journal   (Followers: 1)
C - Journal of Carbon Research     Open Access   (Followers: 3)
Cakra Kimia (Indonesian E-Journal of Applied Chemistry)     Open Access  
Canadian Association of Radiologists Journal     Full-text available via subscription   (Followers: 2)
Canadian Journal of Chemistry     Hybrid Journal   (Followers: 10)
Canadian Mineralogist     Full-text available via subscription   (Followers: 3)
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Catalysis for Sustainable Energy     Open Access   (Followers: 6)
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Catalysis Science and Technology     Free   (Followers: 6)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
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ChemBioEng Reviews     Full-text available via subscription   (Followers: 1)
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Chemical and Engineering News     Free   (Followers: 12)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Full-text available via subscription   (Followers: 70)
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Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 3)
Chemical Research in Toxicology     Full-text available via subscription   (Followers: 19)
Chemical Reviews     Full-text available via subscription   (Followers: 174)
Chemical Science     Open Access   (Followers: 21)
Chemical Technology     Open Access   (Followers: 16)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 5)
Chemical Week     Full-text available via subscription   (Followers: 8)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 55)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 25)
ChemInform     Hybrid Journal   (Followers: 8)
Chemistry & Biodiversity     Hybrid Journal   (Followers: 6)
Chemistry & Biology     Full-text available via subscription   (Followers: 30)
Chemistry & Industry     Hybrid Journal   (Followers: 5)
Chemistry - A European Journal     Hybrid Journal   (Followers: 150)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 15)
Chemistry and Materials Research     Open Access   (Followers: 18)
Chemistry Central Journal     Open Access   (Followers: 4)
Chemistry Education Research and Practice     Free   (Followers: 5)
Chemistry in Education     Open Access   (Followers: 9)
Chemistry International     Hybrid Journal   (Followers: 2)
Chemistry Letters     Full-text available via subscription   (Followers: 45)
Chemistry of Materials     Full-text available via subscription   (Followers: 243)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 9)
Chemistry World     Full-text available via subscription   (Followers: 22)
Chemistry-Didactics-Ecology-Metrology     Open Access  
ChemistryOpen     Open Access   (Followers: 2)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
Chemoecology     Hybrid Journal   (Followers: 2)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 15)
Chemosensors     Open Access  
ChemPhysChem     Hybrid Journal   (Followers: 9)
ChemPlusChem     Hybrid Journal   (Followers: 2)
ChemTexts     Hybrid Journal  
CHIMIA International Journal for Chemistry     Full-text available via subscription   (Followers: 2)
Chinese Journal of Chemistry     Hybrid Journal   (Followers: 6)
Chinese Journal of Polymer Science     Hybrid Journal   (Followers: 10)
Chromatographia     Hybrid Journal   (Followers: 24)
Chromatography Research International     Open Access   (Followers: 7)
Clay Minerals     Full-text available via subscription   (Followers: 9)
Cogent Chemistry     Open Access  
Colloid and Interface Science Communications     Open Access  
Colloid and Polymer Science     Hybrid Journal   (Followers: 10)
Colloids and Surfaces B: Biointerfaces     Hybrid Journal   (Followers: 8)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 3)
Combustion Science and Technology     Hybrid Journal   (Followers: 18)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 2)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Comprehensive Chemical Kinetics     Full-text available via subscription   (Followers: 2)
Comptes Rendus Chimie     Full-text available via subscription  
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Computational and Theoretical Chemistry     Hybrid Journal   (Followers: 9)
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Computers & Chemical Engineering     Hybrid Journal   (Followers: 9)
Coordination Chemistry Reviews     Full-text available via subscription   (Followers: 2)
Copernican Letters     Open Access  
Critical Reviews in Biochemistry and Molecular Biology     Hybrid Journal   (Followers: 5)
Crystal Structure Theory and Applications     Open Access   (Followers: 3)
CrystEngComm     Full-text available via subscription   (Followers: 11)
Current Catalysis     Hybrid Journal   (Followers: 2)
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Current Science     Open Access   (Followers: 56)
Dalton Transactions     Full-text available via subscription   (Followers: 19)
Detection     Open Access   (Followers: 2)
Developments in Geochemistry     Full-text available via subscription   (Followers: 2)
Diamond and Related Materials     Hybrid Journal   (Followers: 12)
Dislocations in Solids     Full-text available via subscription  
Doklady Chemistry     Hybrid Journal  
Drying Technology: An International Journal     Hybrid Journal   (Followers: 4)
Eclética Química     Open Access   (Followers: 1)
Ecological Chemistry and Engineering S     Open Access   (Followers: 4)
Ecotoxicology and Environmental Contamination     Open Access  
Educación Química     Open Access   (Followers: 1)
Education for Chemical Engineers     Hybrid Journal   (Followers: 5)
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Elements     Full-text available via subscription   (Followers: 2)
Environmental Chemistry     Hybrid Journal   (Followers: 9)
Environmental Chemistry Letters     Hybrid Journal   (Followers: 4)
Environmental Science & Technology Letters     Full-text available via subscription   (Followers: 5)

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Journal Cover Canadian Mineralogist
  [SJR: 0.591]   [H-I: 54]   [3 followers]  Follow
   Full-text available via subscription Subscription journal
   ISSN (Print) 0008-4476 - ISSN (Online) 1499-1276
   Published by GeoScienceWorld Homepage  [16 journals]
  • Direct Observation of Boro-Aluminosilicate Melt Compositions: Insights
           From Raman Spectroscopy of Melt Inclusions In Pegmatitic Tourmaline of the
           Gatumba-Gitarama Area (Rwanda)
    • Authors: Hulsbosch, N; Thomas, R, Boiron, M.-C, Dewaele, S, Muchez, P.
      Pages: 377 - 397
      Abstract: This study presents Raman spectroscopic analyses of melt inclusions in tourmaline from tourmaline-quartz-(muscovite) assemblages of common pegmatites of the Gatumba-Gitarama area (Rwanda). The melt inclusions show a main mineralogy composed of muscovite, α-quartz, mogánite, dickite, and minor feldspars which demonstrate, in combination with the observation of dawsonite, nahcolite, jeremejevite, and childrenite daughter minerals, a CO2-, H2O-, B2O3-, and P3O4-enriched peraluminous boro-aluminosilicate composition for the trapped melt. The variable amount of acidic interstitial fluids inside the melt inclusions resulted mainly from heterogeneous trapping of omnipresent, exsolved aqueous fluids during melt inclusion entrapment. Aliquots of this exsolved alkali-rich aqueous fluid phase are preserved in the numerous coexisting fluid inclusions in tourmaline. The observed mineralogy and composition of the melt inclusions deviates strongly from a bulk single-phase melt crystallization model for pegmatite formation. Based on reported experimental, theoretical, and natural constraints, an alternative hypothesis can offer an explanation for the formation of the anomalous but omnipresent residual melts trapped in tourmaline: i.e., the immiscibility of a hydrous fluid and a boro-aluminosilicate melt from the residual bulk aluminosilicate melt. The chemically anomalous composition of the immiscible boro-aluminosilicate melt trapped inside the melt inclusions can explain the mineralogical transition from a granitic mineral mode towards a schorl-quartz-(muscovite) assemblage within the common mineralogical zonation of the pegmatite dike.
      PubDate: 2017-07-14T16:11:58-07:00
      DOI: 10.3749/canmin.1600093
      Issue No: Vol. 55, No. 3 (2017)
  • Texture, Crystal Structure, and Composition of Fluorapatites From Iron
           Oxide-Apatite (Ioa) Deposits, Eastern Adirondack Mountains, New York
    • Authors: Lupulescu, M. V; Hughes, J. M, Chiarenzelli, J. R, Bailey, D. G.
      Pages: 399 - 417
      Abstract: The iron oxide-apatite (IOA) deposits of the eastern Adirondack Mountains consist of intrusive sheets or dikes of magnetite, fluorapatite, augitic pyroxene, quartz, and microcline. Other trace mineral phases include ilmenite with hematite exsolution, V-rich titanite rimming magnetite, zircon, monazite-(Ce), stillwellite-(Ce), lanthanite-(Ce), allanite-(Ce), and thorite. Observations under transmitted light show polygonal and cumulate textures. The ore bodies, each with knife-edge contacts with the host gneisses, are closely associated in time with A-type leucogranites and granitic gneisses (ca. 1070–1050 Ma). Backscattered electron (BSE) images highlight the following types of fluorapatite-monazite-(Ce) relations that formed as a result of metamorphism and fluid-rock interaction: (1) areas of relatively low BSE intensities containing tiny secondary monazite-(Ce) and thorite crystals developed within brighter apatite grains and along crystal margins and fractures; (2) areas of low BSE intensity within larger fluorapatite grains; (3) oriented rods of quartz in fluorapatite; (4) monazite-(Ce) rimming fluorapatite; and (5) multi-domain clusters of fluorapatite in unzoned fluorapatite.Fluorapatite samples from these IOA deposits were analyzed by electron microprobe and laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) for major and trace elements. All grains contain high concentrations of light and heavy rare earth elements and yttrium, and samples from some deposits are exceptionally enriched in heavy rare earth elements and yttrium. The crystal structures of the fluorapatites from Cheever, Mineville, Palmer Hill, Arnold Hill, and Rutgers mine were analyzed. Rare earth elements (REE) are dominant at the Ca2 site, and in the most REE-rich sample, from Cheever, 5.7% of the Ca2 sites and 3.5% of the Ca1 sites are occupied by REEs. We consider that the most likely geological scenario for the incorporation of the REEs in fluorapatite includes high concentrations of incompatible elements in a dense iron- and phosphorus-rich melt that formed by immiscibility with the silicate melt of the Lyon Mountain granite. The high REE concentration appears to have been accommodated in the fluorapatite structure through a coupled substitution with Si4+. A later, low-temperature stage of fluid infiltration, probably at greenschist facies conditions, re-mobilized the REE and produced secondary minerals within the ore, including low-actinide bearing monazite-(Ce), tremolite, ferro-actinolite, chlorite, rutile, and hematite.
      PubDate: 2017-07-14T16:11:58-07:00
      DOI: 10.3749/canmin.1600057
      Issue No: Vol. 55, No. 3 (2017)
  • An Experimental Study of Chlorine Incorporation In Amphibole Synthesized
           Along the Pargasite-Ferro-Pargasite Join
    • Authors: Campanaro, B. P; Jenkins, D. M.
      Pages: 419 - 436
      Abstract: Understanding how chlorine partitions between calcium amphiboles and an ambient fluid can be used to deduce the chlorine content of fluids involved in a wide range of geological processes, such as in high-grade metamorphism, deposition of economic minerals, chlorine metasomatism, and seawater-oceanic crust interactions. One of the most common correlations that is observed in calcium amphiboles is the increase in chlorine concentration with increasing Fe2+/(Fe2+ + Mg) (= Fe#). To quantify this dependence, amphiboles with intended compositions along the pargasite–ferro-pargasite [NaCa2(Mg4Al)(Al2Si6)O22(Cl,OH)2–NaCa2(Fe4Al)(Al2Si6)O22(Cl,OH)2] join were synthesized in the presence of NaCl brines ranging in concentration from 1 molal (m) NaCl to halite saturation. Syntheses were made over the range 700–950 °C and 0.2–0.5 GPa at oxygen fugacities (fO2) near the Co-CoO buffer and for durations of 46–576 h. The observed amphibole compositions varied between pargasite and hastingsite with increasing Fe# for an assumed constant Fe3+/(Fe2+ + Fe3+) ratio of 0.18. The most common additional phases were plagioclase and Ca-rich clinopyroxene with minor davyne in some syntheses. At any given bulk composition, amphiboles increase in Cl content with increasing brine concentrations, reaching a plateau in brines of about 0.1–0.2 mole fraction of NaCl (XNaCl, or 5–15 m NaCl). Amphiboles synthesized in brines below halite saturation showed a fairly linear increase in Cl content from essentially 0.0 to 0.11 atoms per formula unit (apfu) with increasing Fe content. Syntheses in brines above halite saturation showed a distinct jump in Cl contents up to 0.14–0.30 apfu for the two most Fe-rich bulk compositions. Isopleths of constant NaCl concentration have been fitted to all of the data, and a thermochemical analysis of the dependence of the Cl/OH ratio of amphibole to the activity ratio of H2O/HCl in the brine has been offered for amphiboles synthesized in the 1 m NaCl brines. Comparison of the Cl contents of synthetic amphiboles made here with natural pargasitic amphiboles shows that even the highest Cl contents observed here are only about 20% of the maximum Cl contents found in amphiboles from some localities. The main implication of this study is that there is very limited Cl uptake in amphiboles made in this chemical system in the presence of aqueous brines of highly variable concentrations, even for the most Fe-rich amphiboles. The high Cl contents observed in natural assemblages are likely controlled by brine, or perhaps halide or silicate melt chemistry, or crystal-chemical factors (e.g., K content) that exert a stronger effect than just the Fe# of the amphibole.
      PubDate: 2017-07-14T16:11:58-07:00
      DOI: 10.3749/canmin.1600082
      Issue No: Vol. 55, No. 3 (2017)
  • Tonalite-Trondhjemite and Leucogranodiorite-Granite Suites From the Rio
           Maria Domain, Carajas Province, Brazil: Implications For Discrimination
           and Origin of the Archean Na-Granitoids
    • Authors: de Almeida, J. d. A. C; Dall'agnol, R, Rocha, M. C.
      Pages: 437 - 456
      Abstract: The Mesoarchean Na-granitoids exposed in the Rio Maria domain, southeastern Amazonian craton, are represented by tonalite–trondhjemite and leucogranodiorite–granite suites. The 2.98–2.92 Ga tonalite–trondhjemites are the most voluminous rock type in the Rio Maria domain and host 2.86 Ga leucogranodiorite–granite plutons. These rocks share common geochemical characteristics, such as relatively high Al2O3 and Na2O and low Yb and Y contents, as well as the behavior of the REE. However, based on an extensive geochemical data set, it is possible to show that the leucogranodiorite–granites have higher K2O, Ba, Sr, and Rb and lower CaO contents than the tonalite–trondhjemites. The latter are compositionally similar to typical tonalite–trondhjemite–granodiorite (TTG) series and probably originated from partial melting of garnet amphibolites, derived from tholeiitic rocks or from metabasalts of the Identidade greenstone belt, at pressure conditions suitable to produce high, medium, and low La/Yb tonalite–trondhjemite groups. The leucogranodiorite–granites show geochemical affinity with the Transitional TTG of the Yilgarn craton and are related to the Hybrid granitoid group. The ambiguous geochemical character of the Rio Maria leucogranodiorite–granite suite, which shares some characteristics that are typical of the tonalite–trondhjemite rocks and others more commonly observed in the sanukitoid suites, may be related to complex processes involving TTG and sanukitoid magmas. The discrimination of these two Na-granitoid groups helps us estimate the true volume of TTG magmatism in the Rio Maria domain and in understanding the dynamics of petrogenetic processes in the terrane at the end of the Archean.
      PubDate: 2017-07-14T16:11:58-07:00
      DOI: 10.3749/canmin.1600068
      Issue No: Vol. 55, No. 3 (2017)
  • Radiation-Induced Damage In Quartz At the Arrow Uranium Deposit,
           Southwestern Athabasca Basin, Saskatchewan
    • Authors: Cerin, D; Gotze, J, Pan, Y.
      Pages: 457 - 472
      Abstract: Radiation-induced damage in quartz from the overlying Athabasca Supergroup sandstones and the basement host rocks at the Arrow uranium deposit in the southwestern margin of the Athabasca basin, Saskatchewan, has been investigated by electron paramagnetic resonance (EPR) spectroscopy as well as cathodoluminescence (CL) imaging and spectroscopy. Powder EPR spectra confirm that quartz from the Arrow deposit contains a suite of radiation-induced defects, including characteristic silicon vacancy hole centers formed from bombardment of α particles emitted from the radioactive decay of U, Th, and their daughter isotopes. The EPR intensity distribution of α particle-induced defects in detrital quartz close to the sandstone–basement unconformity suggests that uranium-bearing fluids at Arrow are restricted to areas directly above the basement-hosted mineralization. Pink quartz in the basement, which occurs as veins and breccias in spatial association with uranium mineralization, is characterized by elevated, homogeneously distributed radiation-induced defects, suggesting its crystallization from uranium-bearing fluids most likely linked to the main mineralization event. Smoky quartz in veins and cavities often exhibits characteristic α particle-induced CL rims, which crosscut the growth zoning and apparently record late uranium remobilization. Abundant radiation-induced defects in the basement at the Arrow deposit are restricted to quartz within ~7 m from uranium mineralization, confirming structurally controlled fluid flows. These results highlight the application of radiation-induced defects in quartz for determining the loci of uranium-bearing fluids.
      PubDate: 2017-07-14T16:11:58-07:00
      DOI: 10.3749/canmin.1700003
      Issue No: Vol. 55, No. 3 (2017)
  • Burroite, Ca2(NH4)2(V10O28){middle dot}15H2O, A New Decavanadate Mineral
           From the Burro Mine, San Miguel COUNTY, COLORADO
    • Authors: Kampf, A. R; Nash, B. P, Hughes, J. M, Marty, J.
      Pages: 473 - 481
      Abstract: Burroite, Ca2(NH4)2(V10O28)·15H2O, is a new mineral species (IMA2016-079) discovered in the Burro mine, Slick Rock district, San Miguel County, Colorado, U.S.A. (38°2'42''N 108°53'23''W). The mineral is found as orange-yellow, somewhat flattened prisms up to 2 mm in length occurring on a montroseite- and corvusite-bearing sandstone. Burroite has yellow streak, vitreous luster, brittle tenacity, a Mohs hardness of 11/2–2, good cleavage on {001}, and irregular fracture. The measured density is 2.43(2) g·cm–3. The partially determined optical properties are α = 1.764(3), β = n.d., > 1.81, orientation X a, Y probably c*. Electron probe microanalysis gave the empirical formula (based on 43 O apfu) [Ca1.88(NH4)1.82Na0.18]3.88(H0.23V5+10O28)·15H2O. Burroite is triclinic, space group , with a 8.779(2), b 10.311(2), c 12.060(2) Å, α 96.740(4)°, β 107.388(5)°, and 114.439(6)°, and V = 911.2(3) Å3. The strongest four lines in the diffraction pattern are [d in Å(I)(hkl)]: 11.06(100)(001), 9.02(46)(010), 8.10(21) , and 7.71(94) . The atomic arrangement of burroite was solved and refined to R1 = 0.0946 for 2711 independent reflections with F > 4(F). The structural unit in burroite is the [V10O28]6– decavanadate group; charge balance in the structure is maintained by the [Ca2(NH4)2·15H2O]6+ interstitial complex. Linkage between the structural unit and the components of the interstitial complex is principally by hydrogen bonding. The mineral is named for the Burro mine in which it was found.
      PubDate: 2017-07-14T16:11:58-07:00
      DOI: 10.3749/canmin.1700004
      Issue No: Vol. 55, No. 3 (2017)
  • The Tanco Pegmatite At Bernic Lake, Manitoba. XVII. Mineralogy and
           Geochemistry of Alkali Feldspars
    • Authors: Brown, J. A; Martins, T, černy, P.
      Pages: 483 - 500
      Abstract: The alkali-feldspar paragenetic sequence in the Tanco pegmatite spans the entire crystallization and cooling history of the pegmatite and includes several different K-feldspar and albite varieties. Total feldspar modal abundance approaches 50% for the entire pegmatite volume. Blocky K-feldspar, aplitic albite, and albite of the cleavelandite habit together account for most of the total feldspar volume, whereas late, low-temperature feldspars in veins and cavities are mostly contained in inner zones associated with pollucite and petalite. In an inward progression through the concentrically zoned pegmatite, average bulk compositional data for blocky K-feldspar reveal steady increases in Rb2O (1.45–3.08 wt.%) and Cs2O (0.11–0.29 wt.%), increasing followed by decreasing contents of P2O5 (0.34–0.47 wt.%), Li2O (0.014–0.095 wt.%), and Tl (105–239 ppm), decreasing Na2O (2.5–1.1 wt.%) and CaO (0.13–0.08 wt.%), and variable BaO (0.004–0.17 wt.%) and Ga2O3 (0.006–0.010 wt.%). In aplitic albite and albite of the cleavelandite habit, CaO decreases (0.08–0.03 wt.%) and overall K2O and P2O5 contents are variable. Late adularia feldspars from veins and clusters in pollucite exhibit extreme ranges in contents of Rb2O (1.80–24.84 wt.%) and Cs2O (0.10–1.43 wt.%) and significant P2O5 (up to 0.51 wt.%). X-ray powder-diffraction data indicate near-maximum structural order of the early feldspar varieties as maximum microcline and high albite. Hydrothermal adularia crystals are essentially endmember (Or100) high sanidine. The large and economically significant Tanco pegmatite represents an extreme in terms of petrologic processes involving fractional and disequilibrium crystallization from granitic melts enriched in volatiles and fluxing components (H2O, B, F, P), rare alkalis (Li, Rb, Cs), and high field strength elements (Ta, Nb, Zr, Hf). The alkali feldspars are the most significant carriers of P, Li, Rb, Tl, and Cs prior to the stabilization of large volumes of amblygonite–montebrasite, petalite, lepidolite, and pollucite. The rise and fall of trace-element content in feldspars, in relation to the spatial distribution of different zones and mineral assemblages, has implications in terms of the internal evolution of complex granitic pegmatites, as well as on the types and extents of subsolidus readjustments.
      PubDate: 2017-07-14T16:11:58-07:00
      DOI: 10.3749/canmin.1700008
      Issue No: Vol. 55, No. 3 (2017)
  • Silicification of Hydrothermal Gangue Minerals In
           Pb-Zn-Cu-Fluorite-Quartz-Baryte Veins
    • Authors: Burisch, M; Walter, B. F, Markl, G.
      Pages: 501 - 514
      Abstract: Late-stage pseudomorphous and perimorphous replacement of euhedral baryte and, to a lesser extent, fluorite and calcite by quartz is a common phenomenon in hydrothermal vein-type deposits. As a consequence of silicification, the primary mineral assemblage might be substantially altered, and therefore this process has a severe negative impact on the economic potential of mineral resources. Although these replacement textures are often reported and have a significant economic importance in mines producing baryte or fluorite of chemical grade, the process that causes this silicification is surprisingly poorly understood.In the present contribution, more than 40 Jurassic–Cretaceous and post-Cretaceous hydrothermal veins from the Schwarzwald mining district, including replacement textures of primary euhedral baryte, fluorite, and calcite, were investigated with respect to their macro- and microscopic textures. It appears that baryte is favorably replaced by pseudomorphs (bladed quartz), while fluorite and calcite are typically replaced by perimorphs. The textures indicate that the mode of replacement of the primary minerals happens continuously and after the initial vein formation. By combining these textural observations with calculated mineral solubilities, a detailed geochemical model has been developed. Existing fluid inclusion data indicate that substantial cooling of the hydrothermal solutions occurs after primary mineral formation. The calculated cooling path reveals opposing solubilities of quartz and the other gangue minerals (baryte, fluorite, and calcite) with decreasing temperature and explains the observed dissolution and precipitation textures. Furthermore, differences in temperature-solubility systematics between baryte on the one hand and fluorite and calcite on the other are responsible for the differences observed in the textures. This agrees with the occurrence of late-stage, low-temperature baryte crystals overgrowing primary baryte assemblages. Conversely, analogous late-stage calcite and fluorite assemblages are only rarely observed. In summary, silicification is a typical cooling effect in various hydrothermal vein-type deposits, but affects different gangue minerals in different ways depending on their temperature-dependent solubility.
      PubDate: 2017-07-14T16:11:58-07:00
      DOI: 10.3749/canmin.1700005
      Issue No: Vol. 55, No. 3 (2017)
  • Ferro-Ferri-Nyboite From Mont Saint-Hilaire, Quebec, Canada: Correction
    • Authors: Lussier, A. J; Hawthorne, F. C, Abdu, Y. A, Ball, N. A, Tait, K. T, Back, M. E, Steede, A. H, Taylor, R, McDonald, A. M.
      Pages: 515 - 516
      Abstract: The chemical composition and chemical formula for ferro-ferri-nybøite given by Lussier et al. (2014) are wrong due to incorporation of errors during preparation of the paper. The data given in the original IMA submission are correct and are given here: SiO2 47.06, TiO2 0.50, Al2O3 3.16, Fe2O3 12.43, FeO 22.37, (Fetot = 33.56), MnO 2.18, ZnO 0.06, MgO 0.23, CaO 1.03, Na2O 8.15, K2O 1.72, F 0.84, H2Ocalc 1.50, O F –0.35 sum 100.88 wt.%. The formula unit, calculated on the basis of 24 (O + OH + F) with (OH + F) = 2 apfu, is (Na0.67K0.35)(Na1.83Ca0.17)(Mg0.05Fe2+2.96Mn0.29Zn0.01Al0.03Fe3+1.48Ti0.06)(Si7.44Al0.56)O22 (OH1.58F0.42).
      PubDate: 2017-07-14T16:11:58-07:00
      DOI: 10.3749/canmin.1700012
      Issue No: Vol. 55, No. 3 (2017)
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