Abstract
Granites and primary tin mineralization in the Erzgebirge were dated using (1) conventional U–Pb dating of uraninite inclusions in mica, (2) Rb–Sr dating of inclusions in quartz that represent highly evolved melts, (3) Re–Os dating of magmatic–hydrothermal molybdenite, and (4) chemical Th–U–Pb dating of uraninite. Conventional isotope dilution and thermal ion mass spectrometry and chemical Th–U–Pb dating of uraninite in granites from the Ehrenfriedersdorf mining district provide ages of 323.9 ± 3.5 Ma (2σ; Greifenstein granite) and 320.6 ± 1.9 and 319.7 ± 3.4 Ma (2σ, both Sauberg mine), in agreement with U–Pb apatite ages of 323.9 ± 2.9 and 317.3 ± 1.6 Ms (2σ, both Sauberg mine). Rb–Sr analysis of melt inclusions from Zinnwald gives highly radiogenic Sr isotopic compositions that, with an assumed initial Sr isotopic composition, permit calculation of precise ages from single inclusions. The scatter of the data indicates that some quartz-hosted melt inclusions have been affected by partial loss of fluid exsolved from the melt inclusion. Re–Os dating of two molybdenite samples from Altenberg provides ages of 323.9 ± 2.5 and 317.9 ± 2.4 Ma (2σ). Together with age data from the literature, our new ages demonstrate that primary tin mineralization and the emplacement of the large Sn-specialized granites in the Erzgebirge fall in a narrow range between 318 and 323 Ma. Primary Sn mineralization occurred within a short interval during post-collisional collapse of the Variscan orogen and was essentially synchronous over the entire Erzgebirge. In contrast to earlier claims, no systematic age difference between granites of the eastern and western Erzgebirge was established. Furthermore, our data do not support a large age range for Late-Variscan granites of the Erzgebirge (330–290 Ma), as has been previously suggested.
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References
Baumann L, Kuschka E, Seifert T (2000) Lagerstätten des Erzgebirges. Enke im Thieme-Verlag, Stuttgart, p 300
Bielicki KH, Tischendorf G (1991) Lead isotope and Pb–Pb model age determination of ores from Central Europe and their metallogenetic interpretation. Contrib Mineral Petrol 106:440–461
Breiter K, Seltmann R (eds) (1995) Ore mineralizations of the Kru¢cné Hory Mts (Erzgebirge). SGA excursion guide, third biennial SGA meeting, Prague, 28–31 August 1995, Czech Geological Survey, Prague, p 205
Brooks C, Hart SR, Wendt I (1972) Realistic use of two-error regression treatments as applied to rubidium–strontium data. Rev Geophys Space Phys 10:551–577
Carl C, Wendt I (1993) Radiometrische Datierung der Fichtelgebirgsgranite. Z Geol Wiss 21:370–380
Chen F, Siebel W, Satir M (2003) Geochemical and isotopic composition and inherited zircon ages as evidence for lower crustal origin of two Variscan S-type granites in the NW Bohemian massif. Int J Earth Sci 92:173–184
Christensen JN, Halliday AN (1996) Rb–Sr ages and Nd isotopic compositions of melt inclusions from the Bishop Tuff and the generation of silicic magma. Earth Planet Sci Lett 144:547–561
Corfu F (2000) Extraction of Pb with artificially too-old ages during stepwise dissolution experiments on Archean zircon. Lithos 53:279–291
Davis DW, Krogh TE (2000) Preferential dissolution of 234U and radiogenic Pb from alpha-recoil-damaged lattice sites in zircon; implications for thermal histories and Pb isotopic fractionation in the near surface environment. Chem Geol 172:41–58
Finch R, Murakami T (1999) Systematics and paragenesis of uranium minerals. In: Burns PC, Finch R (eds) Uranium: mineralogy, geochemistry and the environment. Rev Miner 38:91–179
Förster B (1996) U/Pb Datierung an Pechblenden der U-Lagerstätte Aue-Niederschlema (Erzgebirge). Ph.D. Thesis, University of Giessen, Germany (212 p. plus appendices)
Förster H-J (1998) Die variszischen Granite des Erzgebirges und ihre akzessorischen Minerale. Habilitation Thesis, Tech Univ Bergakademie Freiberg, Germany
Förster H-J (1999) The chemical composition of uraninite in Variscan granites of the Erzgebirge, Germany. Min Mag 63:239–252
Förster H-J (2000) Cerite–(Ce) and thorian synchysite–(Ce) from the Niederbobritzsch granite, Erzgebirge, Germany: implications for the differential mobility of the LREE and Th during alteration. Can Mineral 38:67–79
Förster H-J (2001) Synchysite–(Y)–synchysite–(Ce) solid solutions from Markersbach, Erzgebirge, Germany: REE and Th mobility during high-T alteration of highly fractionated aluminous A-type granites. Mineral Petrol 72:259–280
Förster H-J, Rhede D (2006) The Be–Ta-rich granite of Seiffen (eastern Erzgebirge, Germany): accessory-mineral chemistry, composition, and age of a Late-Variscan Li–F granite of A-type affinity. Neues Jahrb Mineral Abh 182:307–321
Förster H-J, Tischendorf G, Seltmann R, Gottesmann B (1998) Die varizischen Granite des Erzgebirges: neue Aspekte aus stofflicher Sicht. Z Geol Wiss 26:31–60
Förster H-J, Tischendorf G, Trumbull RB, Gottesmann B (1999) Late-collisional granites in the Variscan Erzgebirge, Germany. J Petrol 40:1613–1645
Geisler T, Schleicher H (2000) Improved U–Th–total Pb dating of zircons by electron microprobe using a simple new background modeling procedure and Ca as a chemical criterion of fluid-induced U–Th–Pb discordance in zircon. Chem Geol 163:269–285
Gerstenberger H (1989) Autometasomatic Rb enrichments in highly evolved granites causing lowered Rb/Sr isochron intercepts. Earth Planet Sci Lett 93:65–75
Gerstenberger H, Kaemmel T, Haase G, Geisler M (1982) Zur Charakterisierung der Granite im Westerzgebirge: Rb/Sr-radiogeochronologische Untersuchungen und Spurenelementkonzentrationen. Freib Forsch Hefte 389:220–246
Gerstenberger H, Haase G, Habedank M (1983) Rb/Sr-Datierungen der jüngeren Granite in Ehrenfriedersdorf. ZfI-Mitt 76:125–133
Gerstenberger H, Haase G, Wemmer K (1995) Isotope systematics of the Variscan postkinematic granites in the Erzgebirge (E Germany). Terra Nostra 95/7:36–41
Haake R (1972) Zur Alterstellung granitischer Gesteine im Erzgebirge. Geologie 21:641–676
Holliger P, Pagel M, Pironon J (1989) A model for 238U radioactive daughter loss from sediment-hosted pitchblende deposits and the Late Permian–Early Triassic depositional U–Pb age of the Muellenbach uranium ore (Baden-Wuerttemberg, F.R.G.). Chem Geol 80:45–53
Hösel G (1994) Das Zinnerz-Lagerstättengebiet Ehrenfriedersdorf/Erzgebirge. Bergbau in Sachsen 1:1–196
Janeczek J, Ewing RC (1995) Mechanisms of lead release from uraninite in natural fission reactors in Gabon. Geochim Cosmochim Acta 59:1917–1931
Kempe U (2003) Precise electron microprobe age determination in altered uraninite: consequences on the intrusion age and the metallogenetic significance of the Kirchberg granite (Erzgebirge, Germany). Contrib Mineral Petrol 145:107–118
Kempe U, Wolf D, Ebermann U, Bombach K (1999) 330 Ma Pb/Pb single zircon evaporation ages for the Altenberg granite porphyry, Eastern Erzgebirge (Germany): implications for Hercynian granite magmatism and tin mineralization. Z Geol Wiss 27:385–400
Kempe U, Bombach K, Matukov D, Schlothauer T, Hutschenreuter J, Wolf D, Sergeev S (2004) Pb/Pb and U/Pb zircon dating of subvolcanic rhyolite as a time marker for Hercynian granite magmatism and Sn mineralization in the Eibenstock granite, Erzgebirge, Germany: considering effects of zircon alteration. Miner Depos 39:646–669
Kigoshi K (1971) Alpha-recoil thorium-234: dissolution into water and the uranium-234/uranium-238 disequilibrium in nature. Science 173:47–48
Kosler J, Simonetti A, Sylvester P, Cox R, Turbett MN, Wilton D (2003) Laser ablation ICP-MS measurements of Re/Os in molybdenites and implications for Re–Os geochronology. Can Mineral 41:307–320
Kühn A, Glodny J, Iden K, Austrheim H (2000) Retention of Precambian Rb/Sr phlogopite ages through Caledonian eclogite facies metamorphism, Bergen Arc Complex, W-Norway. Lithos 51:305–330
Kullerud L (1991) On the calculation of isochrons. Chem Geol 87:115–124
Kurz S (2000) Hydrothermale Alterationsprozesse in Zirkonen-Isotopengeologische und geochemische Implikationen. Ph.D. Thesis, University of Göttingen, p 112
Leroy JL, Turpin L (1988) REE, Th and U behaviour during hydrothermal and supergene processes in a granitic environment. Chem Geol 68:239–251
Ludwig KR (1978) Uranium-daughter migration and U/Pb isotope apparent ages of uranium ores, Shirley, Basin, Wyoming. Econ Geol 73:29–49
Markey RJ, Hannah JL, Morgan JW, Stein, HJ (2003) A double spike for osmium analysis of highly radiogenic samples. Chem Geol 200:395–406
Mattinson JM (1994) A study of complex discordance in zircons using step-wise dissolution techniques. Contrib Mineral Petrol 116:117–129
Matzke H (1982) Radiation damage in crystalline insulators, oxides and ceramic nuclear fuels. Radiat Effects 64:3–33
Mikulski SZ Markey RJ, Stein HJ (2005) Re–Os ages for auriferous sulfides from the gold deposits in the Kaczawa Mountains (SW Poland). In: Mao Jingwen, Bierlein FP (eds) Mineral deposits research: meeting the global Challenge. Proc 8th Bien SGA Meeting, pp 793–796
Müller A, Breiter K, Seltmann R, Pécskay Z (2005) Quartz and feldspar zoning in the eastern Erzgebirge volcano-plutonic complex (Germany, Czech Republic): evidence of multiple magma mixing. Lithos 80:201–227
Nasdala L, Götze J, Pidgeon RT, Kempe U, Seifert T (1998) Constraining a SHRIMP U–Pb age: microscale characterization of zircons from Saxonian Rotliegend rhyolites. Contrib Mineral Petrol 132:300–306
Nasdala L, Wenzel M, Vavra G, Irmer G, Wenzel T, Kober B (2001) Metamictisation of natural zircon: Accumulation versus thermal annealing of radioactivity-induced damage. Contrib Mineral Petrol 141:125–144
Oelsner O (1952) Die pegmatitisch-pneumatolytischen Lagerstätten des Erzgebirges mit Ausnahme der Kontaktlagerstätten. Freib Forsch Hefte 9:80
Pettke T, Diamond LW (1995) Rb–Sr isotopic ananlysis of fluid inclusions in quartz: Evaluation of bulk extraction procedures and geochronometer systematics using synthetic fluid inclusions. Geochim Cosmochim Acta 59:4009–4027
Poitrasson F, Pin C, Duthou JL (1995) Hydrothermal remobilization of rare earth elements and its effects on Nd isotopes in rhyolite and granite. Earth Planet Sci Lett 145:79–96
Rhede D, Wendt I, Förster H-J (1996) A three-dimensional method for calculating independent chemical U/Pb- and Th/Pb-ages of accessory minerals. Chem Geol 130:247–253
Romer RL (1994) Rb–Sr data structure—a possible cause for differences in Rb–Sr WR and U–Pb zircon ages. GFF 116:93–103
Romer RL (2001) Isotopically heterogeneous initial Pb and continuous 222Rn loss in fossils: the U–Pb systematics of Brachiosaurus brancai. Geochim Cosmochim Acta 65:4201–4213
Romer RL (2003) Alpha-recoilin U–Pb geochronology: effective sample size matters. Contrib Mineral Petrol 145:481–491
Romer RL, Rocholl A (2004) Activity disequilibrium of 230Th, 234U, and 238U in old stilbite: effects of young U mobility and α-recoil. Geochim Cosmochim Acta 68:4705–4719
Romer RL, Thomas R (2005) U–Pb dating of micro-inclusions: The age of the Ehrenfriedersdorf tin deposit (Erzgebirge, Germany). In: Mao Jingwen, Bierlein FP (eds) Mineral deposits research: meeting the global challenge. Proc 8th Bien SGA Meeting, pp 817–820
Romer RL, Heinrich W, Schröder-Smeibidl B, Meixner A, Fischer C-O, Schulz C (2005) Elemental dispersion and stable isotope fractionation during reactive fluid-flow and fluid immiscibility in the Bufa del Diente aureole, NE-Mexico: evidence from radiographies and Li, B, Sr, Nd, and Pb isotope systematics. Contrib Mineral Petrol 149:400–429
Selby D, Creaser RA (2004) Macroscale NTIMS and microscale LA-MC-ICP-MS Re–Os isotopic analysis of molybdenite: testing spatial restrictions for reliable Re–Os age determinations, and implications for the decoupling of Re and Os within molybdenite. Geochim Cosmochim Acta 68:3897–3908
Seltmann R, Schilka W (1995) Late Variscan crustal evolution in the Altenberg-Teplice caldera. Evidence from new geochemical and geochronological data. Terra Nostra 95/7:120–124
Seltmann R, Müller A, Schilka W (2001) Geochemical characteristics of the rapakivi-textured porphyritic microgranites in the Altenberg–Teplice caldera. Piestrzynski A et al (eds) Mineral deposits at the beginning of the 21st century. Proceedings of the joint sixth biennial SGA-SEG meeting, Krakow, Poland, 26–29 August 2001, Swets & Zeitlinger Publishers, Lisse, pp 481–484
Siebel W, Chen F, Satir M (2003) Late-Variscan magmatism revisited: new implications from Pb-evaporation zircon ages on the emplacement of redwitzites and granites in NE Bavaria. Int J Earth Sci 92:36–53
Smoliar MI, Walker RJ, Morgan JW (1996) Re–Os isotope constraints on the age of Group IIA, IIIA, IVA, and IVB iron meteorites. Science 271:1099–1102
Steiger RH, Jäger E (1977) Subcommission on geochronology: Convention on the use of decay constants in geo- and cosmochronology. Earth Planet Sci Lett 36:359–362
Stein HJ (2006) Low-rhenium molybdenite by metamorphism in northern Sweden: recognition, genesis, and global implications. Lithos 87:300–327
Stein HJ, Markey RJ, Morgan JW, Hannah JL, Scherstén A (2001) The remarkable Re–Os chronometer in molybdenite: how and why it works. Terra Nova 13:479–486
Stein H, Scherstén A, Hannah J, Markey R (2003) Sub-grain scale decoupling of Re and 187Os and assessment of laser ablation ICP-MS spot dating in molybdenite. Geochim Cosmochim Acta 67:3673–3686
Thomas R (1982) Ergebnisse der thermobarogeochemischen Untersuchungen an Flüssigkeitseinschlüssen in Mineralen der postmagmatischen Zinn-Wolfram-Mineralisation des Erzgebirges. Freib Forsch Hefte C 370:1–85
Thomas R (1989) Untersuchungen von Schmelzeinschlüssen und ihre Anwendung zur Lösung lagerstättengeologischer und petrologischer Problemstellungen. Diss B, Bergakademie Freiberg, p 131
Thomas R, Klemm W (1997) Microthermometric study of silicate melt inclusions in Variscan granites from SE Germany: volatile contents and entrapment conditions. J Petrol 38:1753–1765
Thomas R, Webster JD, Heinrich W (2000) Melt inclusions in pegmatite quartz: complete miscibility between silicate melts and hydrous fluids at low pressure. Contrib Mineral Petrol 139:394–401
Thomas R, Förster H-J, Heinrich W (2003) The behaviour of boron in a peraluminous granite-pegmatite system and associated hydrothermal solutions: a melt and fluid inclusion study. Contrib Mineral Petrol 144:457–472
Thomas R, Förster H-J, Rickers K, Webster JD (2005) Formation of extremely F-rich hydrous melt fractions and hydrothermal fluids during differentiation of highly evolved tin-granite magmas: a melt/fluid-inclusion study. Contrib Mineral Petrol 148:582–601
Thomas R, Webster JD, Rhede D, Seifert W, Rickers K, Förster H-J, Heinrich W, Davidson P (2006) The transition from peraluminous to peralkaline granitic melts in nature: evidence from melt inclusions and accessory minerals. Lithos 91:137–149
Tichomirowa M (1997) 207Pb/206Pb-Einzelzirkondatierungen zur Bestimmung des Intrusionsalters des Niederbobritzschers Granites. Terra Nostra 97/8:183–184
Tichomirowa M, Berger H-J, Koch EA, Belyatski BV, Götze J, Kempe U, Nasdala L, Schaltegger U (2001) Erzgebirge (Central Europe Variscides)—constraints on origin of the rocks and Precambrian to Ordivician magmatic events in the Variscan foldbelt. Lithos 56:303–332
Velichkin VI, Chernyshov IV, Simonova LI, Yudintsev SV (1994) Geotectonic position, petrochemical and geochronological features of the Younger Granite Complex in the Krusne hory (Erzgebirge) of the Bohemian Massif. J Czech Geol Soc 39:116
Warkus F (1997) U–Pb Altersdatierungen an Graniten des Erzgebirges und deren geochemische Einordnung. Dipl Thesis, University Göttingen, p 68
Werner O (1998) K–Ar- und Rb–Sr-Chronologie spätvariszischer Krustenkonvergenz—Bilanzierung des Wärme—und Stofftransportes im Erzgebirge. Ph.D. thesis, University of Heidelberg, p 199
Werner O, Lippolt HJ (2000) White-mica 40Ar/39Ar ages of Erzgebirge metamorphic rocks: simulating the chronological results by a model of Variscan crustal imbrication. In: Franke W, Haak V, Oncken O, Tanner D (eds) Orogenic processes: quantification and modelling on the Variscan belt. Geol Soc Spec Publ 179:323–336
Werner O, Lippolt HJ, Hess JC (1997) 40Ar/39Ar- and Rb–Sr-investigations of the cooling history of metamorphic and plutonic rocks in the Erzgebirge (Mid-European Saxothuringian). Terra Nova 9(Abstr Suppl 1):106–107
Ziegler JF, Biersack JP, Littmark U (1985) The stopping and range of ions in solids. In: Ziegler JF (ed) The stopping and range of ions in matter, vol 1. Pergamon
Acknowledgments
We thank Gerhard Berger (GFZ Potsdam) for doubly polished thick sections and Katrin Feller (Univ Potsdam) and Matthias Kreplin (GFZ Potsdam) for micro-drilling the uraninite and melt inclusion samples. RLR thanks Cathrin Schulz and Anette Meixner (both GFZ Potsdam) for support in the laboratory. Thomas Seifert (BA TU Freiberg) and Wolfgang Schilka (Altenberg)are thanked for providing AIRIE with molybdenite samples from the Altenberg deposit, and Ulf Linnemann (Staatl. Naturhist. Museum Dresden) is acknowledged for apatite samples E1 and E2. The Re–Os analyses were performed by Richard Markey (AIRIE). The Re–Os work was supported by the US National Science Foundation (EAR-0087483) and Edward M. Warner. We thank Hans-Jürgen Förster (Potsdam) and Fernando Corfu (Oslo) for helpful and detailed reviews.
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Romer, R.L., Thomas, R., Stein, H.J. et al. Dating multiply overprinted Sn-mineralized granites—examples from the Erzgebirge, Germany. Miner Deposita 42, 337–359 (2007). https://doi.org/10.1007/s00126-006-0114-2
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DOI: https://doi.org/10.1007/s00126-006-0114-2