TY - JOUR A1 - Schüssler, Ulrich A1 - Henjes-Kunst, Friedhelm T1 - Petrographical and Geochronological Investigations on a Garnet-Tourmaline Pegmatite from Ringgold Knoll, Oates Coast, Antarctica N2 - The Ringgold Knoll pegmatite, a late-stage member of the Granite Harbour Intrusives, crosscuts high-grade Wilson gneisses of the Oates Coast, which forms the westernmost part of the Wilson Terrane at the Pacific end of the Cambro-Ordovician Ross orogenic belt in West Antarctica. The pegmatite mineral assemblage consists of K-feldspar, plagioclase, quartz, garnet (almandinespessartine-pyrope), dark tourmaline (schorl-dravite), muscovite, apatite, monazite, zircon, blue AI-rich tourmaline and dumortierite in order of decreasing abundances. Major, minor and rare earth elements are reported for the greater part of the mineral assemblage. The time of pegmatite emplacement is constrained by Rb-Sr and Sm-Nd isochron ages of 492 ± 8 (2a) Ma and 500 ± 40 (2a) Ma, respectively. High initial 87Sr/86Sr of 0.7315 ± 0.0003 and low E Nd,t of -8.7 ± 1.2 strongly support an origin of the magma from highly evolved crustal source rocks. K-Ar and Ar-Ar model ages of about 470 to 475 Ma for igneous muscovite indicate that the pegmatite together with its wall rocks spent a prolonged period at elevated temperatures before final cooling below about 350 °C. The muscovite dates may give an estimate for the time of exhumation of the Oates Coast crystalline basement along two major late Ross orogenic detachment zones within the Wilson Terrane i.e. the Wilson and the Exiles thrusts (c.f. FLÖTTMANN and KLEINSCHMIDT, 1991). N2 - Der Pegmatit vom Ringgold Knoll geh6rt zur spaten Gangfolge der Granite Harbour Intrusionen und durchschlagt hochgradig metamorphe Wilson Gneise der Oates Coast, die den westlichsten Teil des Wilson Terranes am pazifischen Ende des Kambro-Ordovizischen Ross Orogengiirtels in der Westantarktis bildet. Die pegmatitische Mineralparagenese besteht aus Kalifeldspat, Plagioklas, Quarz, almandin-spessartin-pyrop-betontem Granat, dunklem schorl-dravit-betontem Turmalin, Muscovit, Apatit, Monazit, Zirkon, blauem AI-reichem Turmalin und Dumortierit in der Reihenfolge abnehmenden Modalanteils. FUr den groBeren Teil der Minerale wurden Haupt-, Neben- und Seltenerdelemente bestimmt. Der Zeitpunkt der Pegmatitintrusion wird durch Rb-Sr und Sm-Nd Isochronenalter von 492 ± 8 (20") Ma bzw. 500 ± 40 Ma (20") datiert. Ein hohes "SrI" Sr Initialverhaltnis von 0,7315 ± 0,0003 und ein niedriger Wert flir E Nd,t von -8,7 ± 1,2 sprechen deutlich für eine Magmenherkunft von hochdifferenzierten krustalen Ausgangsgesteinen. K-Ar und Ar-Ar Modellalter von etwa 470 bis 475 Ma von magmatischem Muscovit zeigen, daB der Pegmatit und das Nebengestein eine langsame AbkUhlung auf Temperaturen unter etwa 350°C er1ebten. Die Muscovitdaten konnen als eine Zeitmarke gesehen werden fUr die Heraushebung des kristallinen Grundgebirges der Oates Coast entlang der zwei split Ross-orogenen Wilson und Exiles Hauptüberschiebungszonen im Wilson Terrane (FLÖTTMANN und KLElNSCHMlDT 1991). Y1 - 1994 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-31789 ER - TY - CHAP A1 - Kreuzer, Hans A1 - Vejnar, Zdenek A1 - Schüssler, Ulrich A1 - Okrusch, Martin A1 - Seidel, Eberhard T1 - K-Ar dating in the Teplá-Domazlice zone at the western margin of the Bohemian Massif N2 - K-Ar dating on hornblendes and micas from the Tepla Domazlice zone revealed a pattern of dates which significantly deviates from the mid-Carboniferous to early Permian one that is found in the adjacent low-pressure metamorphic Moldanubian and Saxothuringian. Especially for the Marianske Lazne metabasic complex, confirming early Czech determinations, the dates resemble the early Devonian pattern determined for the Munchberg Gneiss Massif and the Erbendorf-Vohenstrau zone of northeastern Bavaria. This supports the idea that all three units are remnants of a huge' complex which suffered a metamorphic overprint under medium-pressure conditions, probably in the early Devonian. Strong rejuvenation is found in the southern part of the Tepla-Domazlice zone by which micas and even two hornblendes were reset to mid-Carboniferous ages. According to the geological setting, part of the apparently preDevonian dates may be explained by inherited argon from earlier metamorphic and magmatic events, e.g. the high-pressure metamorphism documented in eciogitic relics. However, excess argon, caused by the mid-Carboniferous overprint cannot be excluded. Y1 - 1988 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-31106 ER - TY - JOUR A1 - Schüssler, Ulrich A1 - Kreuzer, H.. A1 - Vejnar, Z. A1 - Okrusch, M. A1 - Seidel, E. A1 - Kopecký, L. A1 - Patzak, M. T1 - Geochemische Untersuchungen und K-Ar Datierungen in der Zone Tepl-Taus N2 - no abstract available KW - Tepl-Taus Y1 - 1989 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-81840 ER - TY - JOUR A1 - Schüssler, Ulrich A1 - Skinner, D. N. B. A1 - Roland, N. T1 - Basischer bis intermediärer Plutonismus im NW-Teil des Wilson Terrane, Nordvictorialand, Antarktis N2 - no abstract available KW - Wilson Terrane KW - Nordvictorialand KW - Antarktis Y1 - 1990 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-81850 ER - TY - JOUR A1 - Schüssler, Ulrich A1 - Okrusch, M. A1 - Patzak, M. A1 - Müller, P. A1 - Kreuzer, H. T1 - The polyphase thermal history of the Erbendorf-Vohenstrauß (ZEV) and the Erbendorf Greenschist (EGZ) zones of NE Bavaria in the light of Ar-Ar spectra N2 - no abstract available KW - Erbendorf KW - Vohenstrauß Y1 - 1990 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-81862 ER - TY - JOUR A1 - Schüssler, Ulrich A1 - Talarico, F. T1 - Granulite facies rocks from the Ross orogenic belt, Northern-Victoria-Land, Antarctica N2 - no abstract available KW - Geographie Y1 - 1991 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-81889 ER - TY - JOUR A1 - Rösch, C. A1 - Hock, R. A1 - Schüssler, Ulrich A1 - Yule, P. T1 - Präislamische Schmuckperlen aus dem Oman - Erste Ergebnisse mineralogisch-materialkundlicher Untersuchungen N2 - no abstracts available KW - Schmuckperle KW - Oman Y1 - 1994 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-81822 ER - TY - CHAP A1 - Kreuzer, H. A1 - Henjes-Kunst, F. A1 - Seidel, E. A1 - Schüssler, Ulrich A1 - Bühn, B. T1 - Ar-Ar spectra on minerals from KTB and related medium-pressure units N2 - No abstract available. KW - Kontinentales Tiefbohrprogramm Y1 - 1993 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-86731 ER - TY - JOUR A1 - Schüssler, Ulrich A1 - Wilhelm, G. T1 - Mikrosondenanalytische Untersuchungen eines Kupfer-Rollsiegels des frühen 3. Jahrtausends v. Ch. vom Tell Karrana-3 bei Mosul, Irak N2 - No abstract available KW - Mikrosonde KW - Analyse Y1 - 1992 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-86747 ER - TY - CHAP A1 - Kreuzer, Hans A1 - Vejnar, Zdenek A1 - Schüssler, Ulrich A1 - Okrusch, Martin A1 - Seidel, Eberhard T1 - K-Ar dating of the last metamorphic events in different tectonic units of the western margin of the Bohemian Massif N2 - K-Ar dating on hornblendes and micas from the TepläDomazlice zone revealed a pattern of dates which significantly deviates from the mid-Carboniferous to early Permian one that is found in the adjacent low-pressure metamorphic Moldanubian and Saxothuringian. Especially for the Mariänske Läzne metabasic complex, confirming early Czech determinations, the dates resemble the early Devonian pattern determined for the Münchberg Gneiss Massif and the Erbendorf-Vohenstrauß zone of northeastern Bavaria. This supports the idea that all three units are remnants of a huge complex which suffered a metamorphic overprint under medium-pressure conditions, probably in the early Devonian. Streng rejuvenation is found in the southern part of the Teplä-Domailice zone by which micas and even two hornblendes were reset to mid-Carboniferous ages. According to the geological setting, part of the apparently preDevonian dates may be explained by inherited argon from earlier metamorphic and magmatic events, e.g. the high-pressure metamorphism documented in eclogitic relics. However, excess argon, caused by the mid-Carboniferous overprint cannot be excluded. KW - Geochemie Y1 - 1988 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-87527 ER - TY - JOUR A1 - von Gehlen, K. A1 - Matthes, S. A1 - Okrusch, Martin A1 - Richter, P. A1 - Röhr, C. A1 - Schüssler, Ulrich T1 - Metapyroxenite in der KTB-Vorbohrung N2 - No abstract available. KW - Kontinentales Tiefbohrprogramm der Bundesrepublik Deutschland Y1 - 1990 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-87539 ER - TY - CHAP A1 - Schüssler, Ulrich A1 - Vejnar, Z. A1 - Okrusch, M. A1 - Rose, S. A1 - Seidel, E. T1 - Geochemistry of Metabasites and gabbroic rocks from the Tepla-Domazlice zone N2 - Various amphibolites, metagabbros and eclogitic relics of the Mariänske Läzne complex, and amphibolites from the Cernä Hora Massif exhibit an uniform geochemical character which compares weil with modern mid-ocean ridge basalts. Geochemically these metabasites are similar to the amphibolites of the Myto area and to schistose, partly striped amphibolites of the neighbouring Tirschenreuth-Mähring Zone and the Erbendorf-Vohenstrauss Zone (Bavaria). Greenschists and amphibolites from the Domazlice metamorphic complex show an alkaline-basaltic tendency conforming to modern within-plate basalts or basalts from anomalaus midocean ridge segments. In their chemical character, these metabasites compare weil with the flaseramphibolites of the Erbendorf-Vohenstrauss Zone. Fine-grained amphibolites in the Warzenrieth area and (gabbro-) amphibolites in the Blätterberg-Hoher Bogen area show normal MORB character. The metamorphosed gabbroic rocks in the southern part of the Neukirchen-Kdyne (meta-) igneous complex are subalkaline - tholeiitic and exhibit a magmatic differentiation trend. They differ from the neighbouring amphibolites by generally lower contents of incompatible elements. KW - Geochemie Y1 - 1988 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-87511 ER -