TY  - JOUR
A1  - Ertl, Andreas
A1  - Giester, Gerald
A1  - Schüssler, Ulrich
A1  - Brätz, Helene
A1  - Okrusch, Martin
A1  - Tillmanns, Ekkehart
A1  - Bank, Hermann
T1  - Cu- and Mn-bearing tourmalines from Brazil and Mozambique: crystal structures, chemistry and correlations
JF  - Mineralogy and Petrology
N2  - Cu- and Mn-bearing tourmalines from Brazil and Mozambique were characterised chemically (EMPA and LA-ICP-MS) and by X-ray single-crystal structure refinement. All these samples are rich in Al, Li and F (fluor-elbaite) and contain significant amounts of CuO (up to ~1.8 wt%) and MnO (up to ~3.5 wt%). Structurally investigated samples show a pronounced positive correlation between the <Y-O> distances and the (Li + Mn\(^{2+}\) + Cu + Fe\(^{2+}\)) content (apfu) at this site with R\(^2\) = 0.90. An excellent negative correlation exists between the <Y-O> distances and the Al\(_2\)O\(_3\) content (R\(^2\) = 0.94). The samples at each locality generally show a strong negative correlation between the X-site vacancies and the (MnO + FeO) content. The Mn content in these tourmalines depends on the availability of Mn, on the formation temperature, as well as on stereochemical constraints. Because of a very weak correlation between MnO and CuO we believe that the Cu content in tourmaline is essentially dependent on the availability of Cu and on stereochemical constraints.
KW  - mineralogy
KW  - Brazil
KW  - Mozambique
Y1  - 2013
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-127296
VL  - 107
IS  - 2
ER  - 
TY  - JOUR
A1  - Klemd, R.
A1  - Matthes, S.
A1  - Schüssler, Ulrich
T1  - Reaction textures and fluid behaviour in very high-pressure calc-silicate rocks of the Münchberg gneiss complex, Bavaria, Germany
N2  - Calc-silicate rocks occur as elliptical bands and boudins intimately interlayered with eclogites and high-pressure gneisses in the Munchberg gneiss complex of NE Bavaria. Core assemblages of the boudins consist of grossular-rich garnet, diopside, quartz, zoisite, clinozoisite, calcite, rutile and titanite. The polygonal granoblastic texture commonly displays mineral relics and reaction textures such as postkinematic grossular-rich garnet coronas. Reactions between these mineral phases have been modelled in the CaO-Al203-Si02-C02-H2 0 system with an internally consistent thermodynamic data base. High-pressure metamorphism in the calc-silicate rocks has been estimated at a minimum pressure of 31 kbar at a temperature of 630°C with X^oSQ.Gi. Small volumes of a C02-N2-rich fluid whose composition was buffered on a local scale were present at peak-metamorphic conditions. The P-T conditions for the onset of the amphibolite facies overprint are about 10 kbar at the same temperature. A'co., of the H20-rich fluid phase is regarded to have been <0.03 during amphibolite facies conditions. These P-T estimates are interpreted as representing different stages of recrystallization during isothermal decompression. The presence of multiple generations of mineral phases and the preservation of very high-pressure relics in single thin sections preclude pervasive post-peak metamorphic fluid flow as a cause of a re-equilibration within the calc-silicates. The preservation of eclogite facies, very high-pressure relics as well as amphibolite facies reactions textures in the presence of a fluid phase is in agreement with fast, tectonically driven unroofing of these rocks.
KW  - calc-silicate rocks; fluid behaviour; P-T path; reaction textures; Variscan basement; very high-pressure metamorphism
Y1  - 1994
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-31035
ER  - 
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  - 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  - JOUR
A1  - Schüssler, Ulrich
T1  - Zur geologischen Situation der Erzlagerstätte Kupferberg-Neufang in der Umrahmung der Münchberger Gneismasse
N2  - Die Kupfer-Zink-Lagerstätte von Kupferberg-Neufang im Bereich der Münchberger Deckenstruktur besteht aus einem etwa 4 km langen Zug einzelner stratiformer Vererzungslinsen, der in NW-SE-Richtung vom anchimetamorphen Paläozoikum "Bayerischer" Faziesentwicklung in die Prasinit-Phyllit-Serie hinüberzieht. Bisherige lagerstättenkundliche Untersuchimgen interpretierten die gesamte Lagerstätte als einheitliche, submarin-exhalativ entstandene stratiforme Bildung in Zusammenhang mit ordovizischem basischem Vulkanismus, der in den Rahmengesteinen der Lagerstätte durch die Diabase der anchimetamorphen Randschieferserie bzw. die Prasinite der Prasinit-Phyllit-Serie dokumentiert ist. Diese Vorstellung steht jedoch in deutlichem Widerspruch zu den Ergebnissen neuerer geochemischer und biostratigraphischer Untersuchungen, die für die Diabase und Prasinite eine völlig unterschiedliche Zusammensetzung ergaben und die zeigten, daß die Prasinit-Phyllit-Serie schon im Oberproterozoikum, die erzführenden Schichten im anchimetamorphen Paläozoikum aber erst im Unterdevon sedimentiert wurden. Für eine Klärung der Situation sind weitere Untersuchungen im Bereich der Lagerstätte erforderlich.
Y1  - 1993
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-31791
ER  - 
TY  - JOUR
A1  - Schüssler, Ulrich
A1  - Skinner, David N. B.
A1  - Roland, Norbert W.
T1  - Subduction-related Mafic to Intermediate Plutonism in the Northwestern Wilson Terrane, North Victoria Land and Oates Coast, Antarctica
N2  - No abstract available
KW  - Wilson Terrane ; intrusions ; mafic composition ; relative age ; petrographic analysis ; gabbroic composition ; subduction zones
Y1  - 1993
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-31805
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  - RPRT
A1  - Schüssler, Ulrich
A1  - von Gehlen, K.
A1  - Matthes, S.
A1  - Okrusch, Martin
A1  - Richter, P.
A1  - Röhr, C.
T1  - Ultramafische Einschaltungen in Metabasiten der KTB-Vorbohrung
N2  - No abstract available
KW  - Kontinentales Tiefbohrprogramm
Y1  - 1991
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-39206
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  -