DOCSLIB.ORG

Roouesite.Bearing Tin Ores from the Omodani. Akenobe

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Roouesite.Bearing Tin Ores from the Omodani. Akenobe Canadion Minerologist Yol. 29, pp. 207-215(1991) ROOUESITE.BEARINGTIN ORESFROM THE OMODANI. AKENOBE,FUKOKU, AND IKUNOPOLYMETALLIC VEIN-TYPE DEPOSITS IN THEINNER ZONE OF SOUTHWESTERNJAPAN MASAAKI SHIMIZU UniversityMuseum, University of Tokyo, Tokyo 113,Jopan AKIRA KATO National ScienceMuseum, Tokyo 169,Japan ABSTRAc"I Mots-dAs.roquesite, gisements polym6talliques en fissu- res,isotopes de soufre, activitd du soufre,temperature, Indium-tin mineralization is observedin the Omodani, Omodani,Akenobe, Fukoku, Ikuno, Japon. Akenobe, Fukoku, and Ikuno deposits,which are Cu- dominant polymetallic veins of late Cretaceous to early Tertiary agein the Inner Zone of southwesternJapan. The INrnooucrIoN indium-tin-bearing oresare commonly composedof roque- site (CuInS2), stannoidite, sphalerite, tennantite- Sincethe first report of the occurrenceof roque- tetrahedrite, chalcopyrite and quartz, with local bornite, site in Japan, from the Eisei vein of the Akenobe mawsonite,galena and arsenopyrite.The iron content of deposit (Kato & Shinohara 1968), no additional the sphaleritethat coexistswith roquesite,stannoidite and roquesitehas beendescribed. This report documents tennantite-tetrahedrite is very low. Temperatures of for- new occurrencesof roquesitein tin ores from the mation based on fluid-inclusion quartz data on from the Omodani Pref.), Akenobe(Hyogo Pref.), Omodani and Akenobe depositsare in range @ukui the the from 285o (Kyoto to 3looc. The 6:+5values ofthe roquesite-b-earingtin ores the Fukoku Pref.), and the Ikuno deposits are virtually constant (-0.8 to +0.3y65). Basedon these (Hyogo Pref.), in the Inner Zone of southwestern descriptions, possible ranges in sulfur activity during for- Japan. These deposits are subvolcanic-type(e.g., mation of the roquesite-bearing tin ores are estimated to Schneiderhdhn 1955) Cu-dominant polymetallic be approximately l0-8 to l0{ atm., and the temperature veins.The indium-bearingtin oresare characteristi was greater than 285oC. cally composedof roquesite, stannoidite, sphalerite, membersof the tennantite-tetrahedriteseries, bor- Keywords: roquesite, polymetallic vein-type deposits, sul- nite and chalcopyrite. Stanniteand kesteritehave not fur isotopes, activity of sulfur, temperature, Omodani, been found. Information possible of Akenobe, Fukoku, Ikuno, Japan. on activiry sul- fur and temperatureof formation of the roquesite- bearing ores can be estimated on the basis of SoMMAIRE electron-microprobeand thermochemicaldata, and fluid-inclusion data obtained on the coexisting Une min€ralisationi indium-dtain a &6 documentdedarrs quartz. les gisementsde Omodani, Akenobe, Fukoku et lkuno, tous des systbmesde fissures polym6talliques d dominance de Cu, d'6ge cr€tac6tardif d tertiaire pr6coce, situ6s dans la DnsczuprronoN Tm DEPosrrs zone interne du Sud-Ouestdu Japon. Le minerai i In-Sn contient couramment roquesite (CuInS), stannoidite, AND ORE MTNTNANOCY sphaldrite, tennantile*t6tra6drite, chalcopyrite et quartz, ainsi que bornite, mawsonite, gal&neet ars6nopyriteacces- The Omodani, Akenobe, Fukoku, and Ikuno soires. La teneur en fer de la sphaldrite en coexistenceavec deposits are located in a former tectonically active roqucite, stannoiditeet tennantite-tetra€driteest trb faible. zone called the Maizuru belt or the Hida marginal D'apr0s les donndessur les inclusions fluides du quartz des tectonic belt, betweenmetamorphic and nonmeta- gisementsd'Omodani et d'Akenobe, la temp€raturede for- morphic belts (Fig. 1). The Maizuru belt probably mation du minerai aurait 6te entre 285 et 3l0oC. Ls valeurs was a convergent plate margin during the late de FaS du minerai d'6tain contenant de la roquesite sont Paleozoic.Granitic batholiths, ultramafic rocks, and i peu prds constantes(-0.8 e + 0.3700).L'activit€ en sou- pelitic fre au cours de la formation du minerai aurait €t6 d'envi- rocks with lignite exist in the vicinity of each ron l0-8 i 10-6 atm., et la tempdrature, sup6rieurei deposit. The specimensare describedbelow, and 2850C. have beendeposited at the University Museum of the University of Tokyo and National Scienc€Museum. (Traduit par la R6daction) Some were collectedby the presentauthors. 207 Downloaded from http://pubs.geoscienceworld.org/canmin/article-pdf/29/2/207/3446221/207.pdf by guest on 23 September 2021 208 THE CANADIAN MINERALOGIST of 56.9 t 2.8 Ma and 51.9 x. 2.6Ma, respectively (Ministry of International Trade and Industry of Japan 1980). Total productionof the depositfrom 1888to 1966 was4.4 x 105tonnes of ore with averagegrades of 1-5 7o Cu, 3-20 oloZn,4-6 {o Pb, and 85 grams per tonne of Ag. Ore specimensstudied are largely composedof bornite, sphalerite,tennantite, stannoi- dite, chalcopyrite,and small amountsof ldllingite, HIDA BELT mawsonite,galena, and nativesilver (Table l). Gan- gue minerals are quartz, chlorite, fluorite, K- feldspar of the adularia habit and calcite. Roque- site is associatedwith bornite, sphalerite,stannoi- dite, mawsonite, galena,and arsenopyrite(Fig. 2A). Akenobe Cu-Zn-Sn-Ag deposit The geologyof the Akenobemining district, Oya- cho, Yabu-gun,Hyogo Prefecture,has been studied by Kato (1920),Saigusa (1958), Muraoka & Ikeda (1968),Kojima & Asada (1973),Sato e/ al. (1977), RYOKEBELT I and Shiozawa(1984). It is located in the Maizuru 136'0 , 5o rookm belt betweenthe Sangunmetamorphic belt to the north and the unmetamorphosedMino-Tamba belt Frc. l. Locationsoftlte Omodani,Akenobe, Fukoku, and to the south. The products of mineralization are Ikunodeposits in theInner Zone of southwestJapan. hosted in sedimentaryand volcanic rocks of the Maizuru Group, of Permian age. K-Ar agesof dikes from the district indicate that the post-ore felsite Omodani Cu-Zn-Pb-Ag deposit (granophyre)is 57.8 + 2.9 Ma and 52.6 t 2.1 Ma, and the pre-orerhyolite is 72.8 r 2.9 Ma (Ishihara Omodani is located at Izumi-mura, Ono-gun, & shibata 1972). Fukui Prefecture, in the Hida marginal tectonic belt Total productionfrom 1935to 1986is 1.7 x 107 betweenthe Hida metamorphiccomplex (Hida belt) tonnesof ore, and averagegrades are I . I 9o Cu,2.00/o and the nonmetamorphicrocks to the south (Mino- Zn,0.4VoSn, and 20 g/t of Ag. Roquesitewas dis- Tamba belt). The veinslie within the Omodani rhyo- coveredin the N 2l stope, -8th level of the Eisei vein lite (Kawai 1956),correlated with the Nohi rhyolite of this deposit, where it occurswith chalcopyrite, (Makiyama et al. 1975), which covers Mesozoic quartz and siderite (Kato & Shinohara 1968).The sedimentaryrocks. The Omodani rhyolite is mainly roquesite-bearingores used in this study wererecently composedof weldedtuff (70-75 wt. 9o SiO), tuff collectedfrom the l4th level of the ChiemonNo. 4 breccia,tuff (71-75 wt.9o SiO), and granite por- vein, and are principally composedof sphalerite, phyry (ca. 77 wL.tloof SiO2).The K-feldspar from tetrahedrite,stannoidite, bornite, chalcopyrite,and the weldedtuff and granite porphyry givesK-Ar ages lesseramounts of mawsonite,galena, ferberite, cas- TABLE1. FIINEMLASSEI'tsLAGE OBSERVED IN SPECII'1ENS STUDIED AND MNGE OF FE".NN(ATOilIC) Ore DelpElt Sp Tn-Td Rq Sd cp Others OBodEni ++ ++ ++ + ++ Lo,Ap,Mw,Gn,Ag Fez- /Zn o.ool" o.2a-o.37 0.07-0,32 lffi. wt..8 In (.) 0.83 (16) 0.07 (19) 0.02 162) (8) 0,09 (10) 0.09 (13) Alenebe ++ ++ i + ++ + Msrcn Fez' / zn 0. 003-0.005 0 . 03-0. 12 0. 05-0. 38 w. sL.$ In (*) 0.48 (e) 0.05 (19) 0.03 (e) (10) 0.11 (11) 0.08 (8) Fukoku a+i + ++ + Mw,l'ld Fez' / zn 0.004-0.015 0.88-1.25 o.45-O.72 nax. rf.8 In (r) 0.08 (20) 0.98 (12) (6) o.30 (14) 0.21 (33) Ikune. *+ + ++ + Aprcn gez* / Zn 0.016-0.036 1.65-2.00 0.97-1.49 &ax. $t..9 h (*) 1.61 (7) 0.09 (10) (15) 0.13 (23) 0.31 (35) tbbr€viatlong: Ag nativ€ ailver, Ap areenopyrlte, Bn bornlt€, cp chaLcopyrite, cn galena, I- loLlingite, ltd mtlldlte, Ms nausonite, Rq roqueglte, Sd Btmoidite, gp sphalerite, Tn-Td temiltite- t€trahedrite ++ comon, + lesa comn. .) nuober of enalysis aa) sphalerl-te tmr€st Ln Cui there are &any tiny chalcopyrite inclusions in gphalerite. Downloaded from http://pubs.geoscienceworld.org/canmin/article-pdf/29/2/207/3446221/207.pdf by guest on 23 September 2021 o d {l s! o o 6 q tr o CO c) .a A ?1 o E 7 J' d J' ! o ! o J 3 Rq .ao o'6 Eb vE 9E !1 A xv E; aE o-: .EaoD<) 9{E XO (58 n^ -a Irr bH a9 €o :t3 EO b0@ 9eoFa ti. OH oo i:. ll Il -.c .H N- ;.H .= Downloaded from http://pubs.geoscienceworld.org/canmin/article-pdf/29/2/207/3446221/207.pdf by guest on 23 September 2021 210 THE CANADIAN MINERALOGIST siterite, scheelite, and an undetermined Ni-Co sul- l.l VoCu,2.2t/oZn,0.4t/0Pb,0.3 Vo Sn, 58.3e/t (Table fide 1, Fig. 2B). Gangueminerals are quafiz, Ag, and A3 g/t Au. The ore specimensused in this fluorite, and siderite. study are composed of roquesite, stannoidite, sphalerite, tennantite, chalcopyrite, and small Fukoku Cu-Zn-Ag deposit amounts of arsenopyrite, galena and quartz (Table I, Fig. 2D). Fukoku also is situated in the Maizuru belt, ar Miyagai, Fukuchiyama City, Kyoto prefecture. The Cnslttcar CovpostrtoN oF CoExIsrINc SuLrrle mining district is geologicallycomposed of sandstone MTNSRALSrN In-Sn Onr with subordinate shales of the Triassic yakuno Group. The Kumohara granite, of probable late Cre- The chemical composition of coexisting minerals taceousage, and severalmasses ofultramafic rocks in the roquesite-bearingore was determinedusing occur near the deposit. a JEOL 733II electronmicroprobe analyzerat the The ore specimensstudied consist of roquesite, GeologicalInstitute, Faculty of Science,Universfuy sphalerite, stannoidite, tennantite, chalcopyrite, and of Tokyo, using the methodsof Shimizu et sl. (1986), small amounts of mawsonite, selenium-bearing matildite (up to 4.7 wt.9o Se), and quartz (Table l, Roquesite and chalcopyrite Fig. 2C). Cosalite,boulangerite, and nativebismuth have been reported in the deposit (Shimizu et al. Representativechemical compositionsand atomic 1966).
Load more

Recommended publications
  • 1393R OMARINIITE, Cu8fe2znge2s12, THE
    Title Omariniite, Cu8Fe2ZnGe2S12, the germanium analogue of stannoidite, a new mineral species from Capillitas, Argentina Authors Bindi, L; Putz, H; Paar, WH; Stanley, Christopher Description This is a pre-proof version Date Submitted 2017-09-29 1 1393R 2 3 OMARINIITE, Cu8Fe2ZnGe2S12, THE GERMANIUM-ANALOGUE OF 4 STANNOIDITE, A NEW MINERAL SPECIES FROM CAPILLITAS, 5 ARGENTINA 6 7 1,* 2 3 4 8 LUCA BINDI , HUBERT PUTZ , WERNER H. PAAR , CHRISTOPHER J. STANLEY 9 10 1Dipartimento di Science de la Terra, Università degli Studi di Firenze, Via G. La Pira, 4, I-50121 Firenze, 11 Italy and CNR – Istituto di Geoscienze e Georisorse, Sezione di Firenze, Via G. La Pira 4, I-50121 Firenze, 12 Italy 13 2Friedl ZT GmbH Rohstoff- und Umwelt Consulting, Karl-Lötsch-Strasse 10, A-4840 Vöcklabruck, Austria 14 3Pezoltgasse 46, A-5020 Salzburg, Austria 15 4Natural History Museum, Cromwell Road, London SW7 5BD, United Kingdom 16 *Corresponding Author: [email protected] 17 18 19 20 21 22 ABSTRACT 23 Omariniite, ideally Cu8Fe2ZnGe2S12, represents the Ge-analogue of stannoidite and was 24 found in bornite-chalcocite-rich ores near the La Rosario vein of the Capillitas epithermal 25 deposit, Catamarca Province, Argentina. The mineral is closely associated with three other 26 Ge-bearing minerals (putzite, catamarcaite, rarely zincobriartite) and bornite, chalcocite, 27 digenite, covellite, sphalerite, tennantite, luzonite, wittichenite, thalcusite and traces of 28 mawsonite. The width of the seams rarely exceeds 60 µm, their length can attain several 29 100 µm’s. The mineral is opaque, orange-brown in polished section, has a metallic luster 30 and a brownish-black streak.
    [Show full text]
  • Discussion Paper on Mineral Groups by E. H. Nickel
    Discussion Paper on Mineral Groups by E. H. Nickel INTRODUCTION There are two aspects to the compilation of mineral groups. One is the criteria to be used in defining a group. In a recent meeting of the CCM in Melbourne, it was generally agreed that the main criteria defining a group are that it should comprise at least two species, and that the species comprising the group should be isostructural, as indicated by similarity of space group and unit-cell parameters. An important additional consideration is the need to develop an arrangement of the groups in a way that makes it relatively easy to find the group to which a particular mineral species should be consigned. There are many ways in which mineral groups can be classified, and I have looked at four different possibilities with the aim of initiating discussion on this topic. To illustrate the four different classification systems, I have applied them to the sulfide and sulfosalt minerals. The four systems, demonstrated below, are as follows: I) Alphabetical; II) Hey’s chemical classification; III) A combination of Hey’s chemical classification and Smith’s structural formulae; and IV) Strunz’s chemical-structural classification. Comments and suggestions are welcomed. I) SULFIDE AND SULFOSALT GROUPS ALPHABETICAL LISTING Argyrodite Group: Orthorhombic, Pna21 (33). Argyrodite structure type Arsenopyrite Group: Monoclinic, P21/c (14). Related to marcasite structure. Berthierite Group: Orthorhombic, Pnam (62). Berthierite structure type. Bournonite Group: Orthorhombic, Pn21m (31). Bournonite structure type Bowieite Group: Orthorhombic, Pbcn (60). Bowieite structure type. Braggite Group: Tetragonal, P42/m (84). Braggite structure type. Brezinaite Group: Monoclinic, I2/m (12).
    [Show full text]
  • Indium Crystal Chemistry : from Thin-Film Materials * Id
    • • • INDIUM CRYSTAL CHEMISTRY : FROM THIN-FILM MATERIALS IN Poster TO NATURAL BULK CHALCOGENIDES * ID 229 * Laboratório Nacional de Energia e Geologia Ma Ondina FIGUEIREDO & Teresa PEREIRA da SILVA LNEG, Geol. Data C., Apt. 7586, 2721-866 Alfragide, & CENIMAT / I3N, Mat. Crystal Chemistry of Indium Sci. Dpt., Fac. Sci. Techn., New Univ. Lisbon, 2829-516 Caparica, Portugal Indium (Z=49) has the electronic structure [Kr] 4d10 5s2 5p1 and frequently assumes the trivalent state, suggesting the inertness of 5s2 electron-pair. Like gallium and unlike tin, indium seldom forms specific minerals, exhibiting a Introduction Table 1 − MORPHOTROPIC DOMAINS of distinctly chalcophile behavior in the Earth’s crust and occurring rather Indium is nowadays widely used in many CHALCOGENIDE MINERALS (Sulphides & Sulphosalts) dispersed within polymetallic sulfide ores (Table 1). technologic fields - electronics, solders, low [chemical range for stable diadochic substitutions in minerals The sulphide roquesite (CuInS2) was the first In-mineral to be described [5], melting-temperature alloys, etc. Discovered in deduced from stable synthetic compounds] followed [6] by indite (Fe In2 S4) and dzhalindite, a tri-hydroxide with In (OH)6 1863 and isolated four years later as a metal, octahedra. The recovery of indium stands mostly on the processing of zinc indium became one of the most relevant scarce Periodic classification of the Elements blende - a cubic mineral typifying tetrahedral sulphides (fig.2) where cations fill metals used in the production of new “high-tech half of the available tetrahedral sites in a cubic closest packing (ccp) of sulfur devices” based on innovative nanotechnologies. anions (S=). The crystal-chemical formula is written Znt[St]c, where t stands Suggestive examples of indium incorporation - S for tetrahedral coordination and c quotes the anion packing [7].
    [Show full text]
  • Indium-Bearing Paragenesis from the Nueva Esperanza and Restauradora Veins, Capillitas Mine, Argentina
    Journal of Geosciences, 65 (2020), 97–109 DOI: 10.3190/jgeosci.304 Original paper Indium-bearing paragenesis from the Nueva Esperanza and Restauradora veins, Capillitas mine, Argentina María Florencia MÁRQUEZ-ZAVALÍA1,2*, Anna VYMAZALOVÁ3, Miguel Ángel GALLISKI1, Yasushi WATANABE4, Hiroyasu MURAKAMI5 1 IANIGLA, CCT-Mendoza (CONICET), Avda. A. Ruiz Leal s/n, Parque San Martin, CC330, (5500) Mendoza, Argentina; [email protected] 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 The Nueva Esperanza and Restauradora are two of the twenty-three veins described at Capillitas mine, an epithermal precious- and base-metal vein deposit located in northern Argentina. Capillitas is genetically linked to other minera- lizations of the Farallón Negro Volcanic Complex, which hosts several deposits. These include two world-class (La Alumbrera and Agua Rica) and some smaller (e.g., Bajo El Durazno) porphyry deposits, and a few epithermal deposits (Farallón Negro, Alto de la Blenda, Cerro Atajo and Capillitas). The main hypogene minerals found at these two ve- ins include pyrite, sphalerite, galena, chalcopyrite, tennantite-(Zn) and tennantite-(Fe). Accessory minerals comprise hübnerite, gold, silver, stannite, stannoidite and mawsonite, and also diverse indium- and tellurium-bearing minerals.
    [Show full text]
  • Ore Geology of the Copper Sulfide Mineralization in the Rudabánya Ore-Bearing Complex
    Central European Geology DOI: 10.1556/24.59.2016.005 Ore geology of the copper sulfide mineralization in the Rudabánya ore-bearing complex Norbert Németh*, János Földessy, Judit Turi Institute of Mineralogy and Geology, Faculty of Earth Science and Engineering, University of Miskolc, Miskolc, Hungary Received: July 18, 2016; accepted: September 21, 2016 The mineralized complex of Rudabánya hosts deposits of several mineral resources including base metal ores. Recent exploration provided new information on the enrichment of copper within this complex. The primary copper mineralization consists of sulfides. The paragenetic sequence starts with fahlore, continues with bornite, and concludes in chalcopyrite formation partly replacing the former phases. It is hosted by brecciated carbonate rocks, overprinting the paragenesis of the iron metasomatism. It was found to be spatially separated from zinc and lead enrichments. Oxidation and a subsequent new pulse of mineralization formed several new copper, zinc, and lead minerals, probably by the remobilization of the primary parageneses. Keywords: base metal ore, bornite, chalcopyrite, fahlore, North Hungary, sediment hosted ore Introduction Rudabánya is a historic mining town in NE Hungary. Documented medieval mining activities were targeted on copper and silver ore cropping out in a hill range extending northeastward of the town. Beginning with the 19th century, iron ores attracted the mining entrepreneurs. Limonite, later also siderite ore, was exploited both with opencast and underground mining.
    [Show full text]
  • New Discoveries of Rare Minerals in Montana Ore
    New discoveries of rare Au and Ag minerals in some Montana ore deposits Chris Gammons Geological Engineering, Montana Tech • Butte • McDonald Meadows • Virginia City District • Elkhorn (Boulder) District Butte • Produced over 600 million oz of silver • 2nd in U.S. to Couer d’Alene district ID • Produced roughly 3 million oz of gold • 2nd in Montana to Golden Sunlight Mine Mining Engineering, Web Exclusive 2016 Mineral (group) Formula Guilbert & Ziehen, 1964 This study HYPOGENE Argentite Ag2SXX Pearceite‐polybasite (Ag,Cu)16(As,Sb)2S11 XX Proustite‐pyrargyrite Ag3(As,Sb)S3 XX Stephanite Ag5SbS4 X Andorite PbAgSb3S6 X Stromeyerite AgCuS X X Ag‐tetrahedrite (Ag,Cu)12Sb4S13 XX Furutobeite (Cu,Ag)6PbS4 X Larosite (Cu,Ag)21(Pb,Bi)2S13 X Matildite AgBiS2 X Jalpaite Ag3CuS2 X Electrum AgAu X Petzite Ag3AuTe2 X Hessite Ag2Te X Empressite (?) AgTe X SUPERGENE Acanthite Ag2SXX Silver Ag X X Cerargyrite AgCl X furotobeite: (Cu,Ag)6PbS4 bornite furutobeite bornite stromeyerite + chalcocite furutobeite Mt. Con mine (AMC # 591) larosite: (Cu,Ag)21(Pb,Bi)2S13 stromeyerite larosite wittichenite Cu3BiS3 strom mawsonite Cu6Fe2SnS8 chalcocite pyrite pyrite bornite MT. Con 5933 Occurrences of furutobeite and larosite: Furutobeite Larosite • None in U.S. • None in U.S. • < 5 locations world‐wide • Butte = 3rd (?) locality • Type locality = Furutobe world‐wide mine, Japan (Kuroko‐type VMS) Fred Larose Early prospector in Cobalt silver camp, Ontario jalpaite: Ag3CuS2 Barite Wittichenite Cu3BiS3 Jalpaite Bornite Jalpaite AMC 4756 Anselmo Mine EPMA‐BSE image Goldfieldite Cu10Te 4S13 Bi‐Cu‐Se‐telluride Tennantite or enargite Emplectite: CuBiS2 Bi‐Cu‐Se‐telluride Hessite (Ag2Te) Empressite (AgTe) St.
    [Show full text]
  • Primary Minerals of the Jáchymov Ore District
    Journal of the Czech Geological Society 48/34(2003) 19 Primary minerals of the Jáchymov ore district Primární minerály jáchymovského rudního revíru (237 figs, 160 tabs) PETR ONDRU1 FRANTIEK VESELOVSKÝ1 ANANDA GABAOVÁ1 JAN HLOUEK2 VLADIMÍR REIN3 IVAN VAVØÍN1 ROMAN SKÁLA1 JIØÍ SEJKORA4 MILAN DRÁBEK1 1 Czech Geological Survey, Klárov 3, CZ-118 21 Prague 1 2 U Roháèových kasáren 24, CZ-100 00 Prague 10 3 Institute of Rock Structure and Mechanics, V Holeovièkách 41, CZ-182 09, Prague 8 4 National Museum, Václavské námìstí 68, CZ-115 79, Prague 1 One hundred and seventeen primary mineral species are described and/or referenced. Approximately seventy primary minerals were known from the district before the present study. All known reliable data on the individual minerals from Jáchymov are presented. New and more complete X-ray powder diffraction data for argentopyrite, sternbergite, and an unusual (Co,Fe)-rammelsbergite are presented. The follow- ing chapters describe some unknown minerals, erroneously quoted minerals and imperfectly identified minerals. The present work increases the number of all identified, described and/or referenced minerals in the Jáchymov ore district to 384. Key words: primary minerals, XRD, microprobe, unit-cell parameters, Jáchymov. History of mineralogical research of the Jáchymov Chemical analyses ore district Polished sections were first studied under the micro- A systematic study of Jáchymov minerals commenced scope for the identification of minerals and definition early after World War II, during the period of 19471950. of their relations. Suitable sections were selected for This work was aimed at supporting uranium exploitation. electron microprobe (EMP) study and analyses, and in- However, due to the general political situation and the teresting domains were marked.
    [Show full text]
  • Electronprobe Analyses Oj Stannite and Related Tin Minerals
    JU4G Electronprobe analyses oj stannite and related tin minerals By G. SPRINGER Institut flir Mineralogie und Lagerstattenlehre, 51 Aachen, Wlillnerstr. 2, Germany1 [Taken as read 7 November 1961:\j Summary. Quantitative electronprobe microanalyses have been made of stannite from various localities. It was found that in general this mineral corresponds in composition to the formula Cu2FeSnS.. However, noticeable deviations in the ratio of the metals can occur and considerable concentrations of zinc may be present. Some tin minerals related to stannite have also been analysed, namely hexa- stannite, mawsonite, and an apparently hitherto unknown mineral to which the name rhodostannite is given. Zusammenfassung. Quantitative Elektronenstrahl-Mikroanalysen von Zinn- kiesen verschiedener Lagerstatten wurden durchgefiihrt. Es wurde festgestellt, daB sie in ihrer Zusammensetzung gewohnlich gut der Formel Cu2FeSnS. ent- sprechen. Es konnen jedoch merkliche Abweichungen im Verhaltnis der Metall- gehalte zueinander auftreten, insbesondere konnen betrachtliche Konzentrationen von Zink vorhanden sein. Es wurden auch einige dem Zinnkies verwandte Zinnmineralien analysiert namlich Hexastannit, Mawsonit und ein bisher unbekanntes Mineral, dem der Name Rhodostannit gegeben wird. INCE the systematic study by Ramdohr (1944) tin minerals re- S lated to stannite have received increased interest. Ramdohr recognized at least four different minerals which he called' Zinnkies? I-IV'. Subsequently, Ramdohr (1960) gave the name hexastannite to 'Zinnkies? I' and suggested for it the formula Cu3Fe2SnS6 and a hexa- gonal lattice structure of the wurtzite type. 'Zinnkies? II' is now known to be identical with the cubic phase isostannite studied by Claringbull and Hey (1955). Ramdohr's phases 'Zinnkies? III' and 'Zinnkies? IV' have so far only been recognized from Carguaicollo in Bolivia.
    [Show full text]
  • Geology and Mineralization of the Cape Horn
    GEOLOGY AND MINERALIZATION OF THE CAPE HORN - LYELL COMSTOCK AREA, MT. LYELL by GEOFFREY R. GREEN", B.Sc. Submitted in partial fulfilment of the requirements for the degree of Bachelor of Science with Honours. University of Tasmania February, 1971 /1 there must be few places in the world where everything is as simple as at Mt. LyeU." J~ Bradley, 1957. FRONTISPIECE Southern slopes of the Comstock Valley looking east. Prominent outcrop at right is Comstock chert. i CONTENTS page List of Plates iii List of Figures iv List of Tables v ABSTRACT 1 1. INTRODUCTION 2 1.1 Nature and Scope of the Study 2 1.2 Procedure 2 1.3 Location and Access 4 1. 4 Previous Literature 4 1.5 Nomenclature 6 1.6 Acknowledgements 6 2. STRATIGRAPHY 7 2.1 Cambrian System 7 Mt. Read Volcanics 7 1. Ignimbrites (? )_and Minor Siltstones 7 2. Felsitic Ignimbrites (?) 12 3. Intermediate Lithic (?) TUffs 14 4. Keratophyric Lavas 16 5. Comstock Chert 18 6. Greywacke Conglomerate and Limestones 22 7. Banded Quartz Keratophyric Lapilli Tuffs 25 2.2 Ordovician System 29 Jukes Conglomerate 29 Owen Conglomerate 30 Gardon Limestone 31 2.3 Pleistocene Moraine 31 3. STRUCTURE 32 3.1 Regional Structure 32 3.2 Structure of the Cape Horn Area 33 3.3 Pre-Devonian Movement ott the North Lyell Fault 35 ii 4. HYDROTHERMAL ALTERA.TION AND THE LYELL SCHISTS 39 4.1 Chlorites and Quartz Chlorite Schists 39 4.2 Quartz Sericite Schists 46 4.3 Other Schist Types at Cape Horn 50 4.4 Alteration in the Lithic Tuffs 51 4.5 The Comstock Area 53 4.6 Synthesis 56 5.
    [Show full text]
  • A Mineralogical Field Guide for a Western Tasmania Minerals and Museums Tour
    MINERAL RESOURCES TASMANIA Tasmania DEPARTMENTof INFRASTRUCTURE, ENERGY and RESOURCES Tasmanian Geological Survey Record 2001/08 A mineralogical field guide for a Western Tasmania minerals and museums tour by R. S. Bottrill This guide was originally produced for a seven day excursion held as part of the International Minerals and Museums Conference Number 4 in December 2000. The excursion was centred on the remote and scenically spectacular mineral-rich region of northwestern Tasmania, and left from Devonport. The tour began with a trip to the Cradle Mountain National Park, then took in visits to various mines and mineral localities (including the Dundas, Mt Bischoff, Kara and Lord Brassey mines), the West Coast Pioneers Memorial Museum at Zeehan and a cruise on the Gordon River. A surface tour of the copper deposit at Mt Lyell followed before the tour moved towards Hobart. The last day was spent looking at mineral sites in and around Hobart. Although some of the sites are not accessible to the general public, this report should provide a guide for anyone wishing to include mineral sites in a tour of Tasmania. CONTENTS Tasmania— general information Natural history and climate ………………………………………………… 2 Personal requirements ……………………………………………………… 2 General geology…………………………………………………………… 2 Mining history …………………………………………………………… 4 Fossicking areas — general information ………………………………………… 4 Mineral locations Moina quarry …………………………………………………………… 6 Middlesex Plains ………………………………………………………… 6 Lord Brassey mine ………………………………………………………… 6 Mt Bischoff ………………………………………………………………
    [Show full text]
  • Cordilleran Epithermal Cu-Zn-Pb-(Au-Ag) Mineralization in the Colquijirca District, Central Peru: Deposit-Scale Mineralogical Patterns
    ©2009 Society of Economic Geologists, Inc. Economic Geology, v. 104, pp. 905–944 Cordilleran Epithermal Cu-Zn-Pb-(Au-Ag) Mineralization in the Colquijirca District, Central Peru: Deposit-Scale Mineralogical Patterns RONNER BENDEZÚ†,1,2 AND LLUÍS FONTBOTÉ2 1Bilbao 295, Lima, Peru 2Sciences de la Terre et de l’environnement, Université de Genève, Rue de Maraîchers 13, CH-1205, Genève, Switzerland Abstract At Colquijirca, central Peru, a Miocene diatreme-dome complex is associated in space and time with several large epithermal polymetallic (Cu-Zn-Pb-Au-Ag) deposits of the Cordilleran class. Of these deposits, Smelter and Colquijirca, located in the northern sector of the district, are part of a continuously mineralized north- south corridor that extends for nearly 4 km outward from the diatreme-dome complex and to depths of 1 km below surface. This corridor is zoned from Cu-(Au) ores in its inner parts (Smelter deposit) to peripheral Zn- Pb-(Ag) ores (Colquijirca deposit). The Smelter-Colquijirca corridor has undergone minor erosion, providing a good example of a nearly intact paleo-epithermal system of the Cordilleran class. This description of the hypogene mineralogical patterns of the Smelter-Colquijirca corridor leads to the pro- posal that they are the result of superimposition in time and space of three main stages. During an early quartz- pyrite stage, in which basically no economic ore deposition occurred, carbonate rocks surrounding the Marca- punta diatreme-dome complex were replaced by quartz and pyrite. This was followed by the main ore stage, which was largely superimposed on the quartz-pyrite replacements and produced zonation of ore minerals and metals along much of the Smelter-Colquijirca corridor.
    [Show full text]
  • THE GRYSTAL STRUCTURE of MAWSONITE, Gu.Fe,Sns' J. T
    Canadian Minerologist Vol. 14 w. 529-535 (1976) THE GRYSTALSTRUCTURE OF MAWSONITE, Gu.Fe,SnS' J. T. SZYMANSKI Mineral Sciences Laboratory, CANMET, Department ol EnergX, Mittes and Resoutces 555 Booth Street, Qtr6tta, Canada A.rsrnecr INtnoPucrroN The crystal structure of mawsonite, Cu6FesSnS6, Mawsonite, CudFeaSnSe,was first described has been determined and refined to an R-value of by Markham & Lawrence (1965)' and idedified 0.049 (all 1426 d^ta) and 0.037 (1004 "observed" by them as being present in the material de- data only) from multiple sets of four-circle diffrac- scribed as "orange bornite" by Murdock (1916). tometer X-ray intensity data. Microprobe analysis The chemical composition has been variously indicates that the fonnula is stoichiometric in terms reported as CuzFeaSnSro(Marlfiam & Lawrence of tlre metals, but with l.SVo of tbe sulfur replaced 1965), 1967)' C\reFea by selenium in the specimen examined. The struc- Cus.urFer.eeSno.ssSe.soS-6vy ture is tetragonal, a 7.603(2), c 5.358(1)4, space SnSa (Springer 1968), and Cu:.aoFeSno.ssSe.oo (Kachalovskaya 1973). The more lecent group P4m2, based ccp sulfur et al, and is on a nearly & matrix with metals filling hall of the tetrahedral analysesof Petruk (1973) and of Yamanaka interstices and an extra interstitial Fe atom at the Kato (1976) are in agreement with the present (Yz,Vz,/z) position. The latter gives rise- to close analyses and with the present structural deter- Fe Fe . Fe contacts (2.679(1)A) in the mination. z direction, but no close Fe . Fe contacts normal Mawsonite powder ,patterns generally have to tbis.
    [Show full text]