MSCC3 3rd MINERAL SCIENCES IN THE CARPATHIANS ...

More documents

Recommendations

Info

Acta Mineralogica-Petrographica, Abstract Series 5, Szeged, 2006SULPHOSALTS FROM CHYŽNÉ-HERICHOVÁ IN THE WESTERN CARPATHIANS(SLOVAKIA)BÁLINTOVÁ, T. & OZDÍN, D.Department of Mineralogy and Petrology, Faculty of Natural Sciences, Comenius University, Mlynská dolina G, 842 15 Bratislava,Slovak RepublicE-mail: ozdin@fns.uniba.skHerichová occurrence is found ~ 3 km NNE from the villageof Chyžné (County Revúca) in Central Slovakia. Thelocality is situated in the western part of the Spišskogemerskérudohorie Mts. near the contact zone of two significanttectonic units of the Western Carpathians – Gemericumand Veporicum Unit. The host rocks of the hydrothermalmineralization is granite of Rimavica type and Carboniferousmetamorphosed fine-grained sandstones cyclicallyalternating with phyllite schists of the Slatvina formation.We described the following mineral assemblages: 1) arsenopyrite–pyrite(with arsenopyrite, pyrite, sphalerite, hübnerite,quartz); 2) stibnite (stibnite, jamesonite, zinkenite,berthierite, chalcostibite, tetrahedrite, kermesite, andorite I,robinsonite, chalcopyrite, sphalerite, quartz); 3) carbonate(rhodochrosite, calcite, kutnohorite); 4) Galena (galena, bismuthinite,native bismuth, heyrovskýite, lillianite, gustavite,joséite-A, joséite-B, baksanite, andorite II, quartz). The hypergenestage is represented by secondary minerals: cerussite,anglesite, gypsum, senarmontite, stibiconite (?), valentinite(?), scorodite and oxides of Mn, Fe and Sb.Sulphosalts are mainly represented by Pb-Sb, Ag-Pb-Sband Ag-Pb-Bi phases (groups).From the group of Pb-Sb sulphosalts jamesonite is mostcommon. Jamesonite show a stable chemical composition,sometimes with increased content of Cu (up to 0.16 apfu), Ag(up to 0.04 apfu) and Bi (up to 0.03 apfu). Zinkenite frequentlyforms euhedral needle crystals enclosed by tetrahedrite,antimonite and jamesonite or by idiomorphic crystalsof sphalerite. Zinkenite has sometimes an increased contentof Zn (0.68 wt%, 0.62 apfu) and/or Bi (0.88 wt%, 0.25 apfu).Robinsonite sporadically contains up to 0.02 apfu Bi. All thePb-Sb sulphosalts contain 0.01–0.05 apfu Cd and 0.01–0.09apfu Cl.Ag-Pb-Bi sulphosalts are represented by lillianite homologuesN = 4 (gustavite and lillianite) and N = 7 (heyrovskýite).According to their chemical composition all theAg-Pb-Bi sulphosalts are markedly enriched the Ag-Bi endmember.Content of the Ag-Bi end-member in lillianitereaches 54.11–73.45 mol% range, in heyrovskýite 46.58–64.21 mol% range and in gustavite 79.57 to 93.86 mol%range, which is almost the Ag-Bi end-member of the lillianite–gustaviteseries. Lillianite and heyrovskýite have anincreased content of Sb (up to 0.09 apfu) and Cd (up to 0.16apfu). An increased concentration of Sb (up to 0.08 apfu) andCd (up to 2.07 apfu) was detected in gustavite, too.Ag-Pb-Sb sulphosalts are represented by the analogues ofthe lillianite homologous series (N = 4). Two types of andoriteoccur on the locality. The first type of andorite formstiny needles and inclusions in stibnite together with robinsoniteand jamesonite. It contains 97.76–101.38% molecule ofandorite and according to MOËLO et al. (1989) it is senandorite(andorite VI). This andorite have an increased contentof Cu (up to 0.22 apfu), Fe (up to 0.02 apfu), Cd (up to 0.02apfu) and sometimes Bi (up to 0.01 apfu), too. The secondtype of Ag-Pb-Sb sulphosalts (andorite?) occurs associatedwith Bi-Pb-Ag sulphosalts, native bismuth, bismuthinite andBi-Te minerals in galena. These sulphosalts contain 77.81–81.79% andorite molecule and can be grouped between ramdohriteand an unnamed member of the series “81.25”, withthe theoretical formula of Pb 22 Ag 13 Sb 45 S 96 . These sulphosaltshave an increased content of Cd (up to 0.09 apfu) and especiallyBi (up to 1.38 apfu).Tetrahedrite frequently forms idiomorphic to allotriomorphiccrystals in the quartz. We described two types of tetrahedrite.The first type forms isolate grains in quartz and it canbe characterised by an increased content of Hg (up to 0.03apfu), Cu (up to 9.77 apfu) and a decreased content of Ag (upto 1.38 apfu) as compared to the second type of tetrahedrite.The second type occurs together with zinkenite, jamesoniteand sphalerite. Both types of tetrahedrite have an increasedcontent of Cd (up to 0.03 apfu) and sometimes As (up to 0.32apfu).Bi-Te minerals occurs together with native bismuth, bismuthiniteand Ag-Pb-Bi(-Sb) sulphosalts in galena. We identifiedjoséite-A, joséite-B and baksanite. In these telluridesthe content of Se is very low. On the average joséite-A andjoséite-B contain about 0.16 apfu Pb and baksanite 0.34 apfuPb. Content of tellurium varies at from 1.23 apfu to 1.36 apfufor joséite-A, from 1.49 apfu to 1.54 apfu for joséite-B andfrom 1.82 apfu to 2.02 apfu for baksanite. The average empiricalcrystal chemical formula of the tellurides is as follow:baksanite (Bi 5.66 Sb 0.01 ) 5.67 (Pb 0.34 Cu 0.01 ) 0.35 Te 1.92 Se 0.01 S 3.0 5,joséite-A (Bi 4.11 Sb 0.01 ) 4.12 Pb 0.16 Te 1.29 S 1.41 and joséite-B(Bi 3.97 Sb 0.01 ) 3.98 Pb 0.16 Te 1.55 Se 0.02 S 1.30 .ReferenceMOËLO, Y., MAKOVICKY, E. & KARUP-MØLLER, S.(1989): Sulfures complexes plombo-argentifères: minéralogieet cristallochimie de la série andorite-fizelyite(Pb,Mn,Fe,Cd,Sn) 3–2x (Ag,Cu) x (Sb,Bi,As) 2+x (S,Se) 6 . Documentsdu BRGM, 167, Orléans: BRGM, 107 p.8www.sci.u-szeged.hu/asvanytan/acta.htm
Acta Mineralogica-Petrographica, Abstract Series 5, Szeged, 2006MINERALOGY OF LAMPROPHYRES FROM THE DITRĂU ALKALINE MASSIF, ROMANIABATKI, A. & PÁL-MOLNÁR, E.Department of Mineralogy, Geochemistry and Petrology, University of Szeged, P.O. Box 651, H-6701 Szeged, HungaryE-mail: batki@geo.u-szeged.huLamprophyres are a group of H 2 O and/or CO 2 -rich, alkalinerocks ranging from sodic to potassic and from ultrabasicto intermediate. They typically form subvolcanic dykes, sills,pipes and vents (ROCK, 1991).The Ditrău Alkaline Massif (DAM) is one of the most diverseand compound geological formations of the EasternCarpathians. The massif was formed by hornblendite, diorite(called Tarnica Complex, PÁL-MOLNÁR, 2000), syenite,nepheline syenite, alkali granite and monzonite which are cutby late-stage lamprophyre (camptonite and kersantite) dykes.This paper presents the results of mineralogical analysesinvestigated on lamprophyres from the northern part of theDAM.Mineral compositions were measured with a CamecaSX50 electron microprobe at the Department of Earth Sciences,University of Uppsala, Sweden. Operating conditions:probe current 15 nA, acceleration voltage 20 kV.Essential ferromagnesian phases in the studied lamprophyresare calcic and Ti-rich groundmass amphiboles (Fig.1A, B) and phenocrystic pyroxenes (Fig. 1E), abundant biotites-phlogopiteswith mg# = 0.47-0.75 (Fig. 1D) andmelanitic garnets with the composition ofCa 3.1 Fe 1.4 Ti 0.16 Al 0.5 Si 3 O 12 . Lamprophyres from the DAM alsocarry plagioclase feldspars (albite–andesine with An 0.1–34 ),some K-feldspars (Fig. 1F), feldspathoids and carbonates.Accessories are apatite, titanite, magnetite and zircon. Postmagmaticor secondary phases are tremolite–actinolite (Fig.1C) chlorite (FeO 13 to 24 wt%), sericite, epidote and allanite-(Ce,La).AcknowledgementsThe financial background for this work was provided bythe Hungarian National Science Found (OTKA, Grant No. T046736) and the Department of Geology and Geochemistry,Stockholm University, Sweden.ReferencesPÁL-MOLNÁR, E. (2000): Hornblendites and diorites of theDitró Syenite Massif. Szeged: University of Szeged, Departmentof Mineralogy, Geochemistry and Petrology,172 pp.ROCK, N.M.S. (1991): Lamprophyres. Glasgow: Blackie,285 pp.Mg/(Mg+Fe2)TSiMg/(Mg+Fe2)1BKaersutiteFerro-Kaersutite07 6TSiMg/(Mg+Fe2)51TremoliteTr HbTschAct Magnesio-Hbl TschermakiteActinoliteHblHblFerro-Hbl1AMgMagnesio-HasSilicicEd HastingsiteEdenite HblEdeniteHblMgaMagnesianHasHastingsiteHblFeSilicic Ferro-EdFerro-Edenite Edenite HasHbl HastingsiteHbl08,0 7,5 7,0 6,5 6,0 5,5Fe-Ferro-ActActinoliteHblFe-Ferro-TschTschermakiteHbl08,0 7,5 7,0 6,5 6,0 5,5TSiCEastonite3DSiderophylliteEWoFOrAlIVDiopside HedenbergiteAugiteSanidine20 1PhlogopiteFe/(Fe+Mg)AnniteEnPigeoniteClinoenstatite ClinoferrosilliteFsAnorthoclaseAlbite Oligoclase AndesineLabradorite Bytownite AnorthiteAbAnFig. 1: Compositions of amphiboles (A, B, C), biotites (D), pyroxenes (E) and feldspars (F) in • camptonites – Tarnica Complex,• camptonites – Török Creek and kersantites – Török and Nagyág Creek (DAM).www.sci.u-szeged.hu/asvanytan/acta.htm 9
Page 1: MSCC33 rd MINERAL SCIENCES IN THE C
Page 5 and 6: Acta Mineralogica-Petrographica, Ab
Page 7: Acta Mineralogica-Petrographica, Ab
Page 59 and 60:
Acta Mineralogica-Petrographica, Ab
Page 61 and 62:
Page 63 and 64:
Page 65 and 66:
Page 67 and 68:
Page 69 and 70:
Page 71 and 72:
Page 73 and 74:
Page 75 and 76:
Page 77 and 78:
Page 79 and 80:
Page 81 and 82:
Page 83 and 84:
Page 85 and 86:
Page 87 and 88:
Page 89 and 90:
Page 91 and 92:
Page 93 and 94:
Page 95 and 96:
Page 97 and 98:
Page 99 and 100:
Page 101 and 102:
Page 103 and 104:
Page 105 and 106:
Page 107 and 108:
Page 109 and 110:
Page 111 and 112:
Page 113 and 114:
Page 115 and 116:
Page 117 and 118:
Page 119 and 120:
Page 121 and 122:
Page 123 and 124:
Page 125 and 126:
Page 127 and 128:
Page 129 and 130:
Page 131 and 132:
Page 133 and 134:
show all

MSCC3 3rd MINERAL SCIENCES IN THE CARPATHIANS ...

Create successful ePaper yourself

Delete template?

Save as template?