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  1. No Access

    Article

    Palaeoproterozoic A-type felsic magmatism in the Khetri Copper Belt, Rajasthan, northwestern India: petrologic and tectonic implications

    A number of small Palaeoproterozoic granitoid plutons were emplaced in the Khetri Copper Belt, which is an important Proterozoic metallogenic terrane in the northeastern part of Aravalli mountain range. Contig...

    P. Kaur, N. Chaudhri, M. Okrusch, J. Koepke in Mineralogy and Petrology (2006)

  2. No Access

    Article

    Contact metamorphism and metasomatism at a dolerite-limestone contact in the Gebel Yelleq area, Northern Sinai, Egypt

    At the northeastern flank of Gebel Yelleq, northern Sinai, pure limestones of Upper Cretaceous age were subjected to a thermal overprint, caused by a c. 80 m thick Tertiary olivine dolerite sill. Metasomatic supp...

    M. M. Abu El-Enen, M. Okrusch, T. M. Will in Mineralogy and Petrology (2004)

  3. No Access

    Article

    Phase relations of calc-silicate assemblagesin the Auerbach marble, OdenwaldCrystalline Complex, Germany

    In the Odenwald Crystalline Complex, calc-silicate rocks are concentrated at the margins of the marble layer of Auerbach. They were presumably formed by metasomatic exchange between the calcite marble and the...

    E. Schmädicke, M. Okrusch, W. Schubert, B. Elwart, U. Görke in Mineralogy and Petrology (2001)

  4. No Access

    Article

    Oxide–sulphide relationships in sodalite-bearing metasomatites of the Epembe–Swartbooisdrif Alkaline Province, north-west Namibia

    The south-eastern part of Kunene Intrusive Complex (KIC), Namibia/Angola, is host to volumetrically significant, and economically important, concentrations of sodalite in the area around Swartbooisdrif, north...

    V. von Seckendorff, K. Drüppel, M. Okrusch, N. J. Cook, S. Littmann in Mineralium Deposita (2000)

  5. No Access

    Article

    Simultaneous horst-basin formation and magmatism during Late Variscan transtension: evidence from 40Ar/39Ar and 207Pb/206Pb geochronology in the Ruhla Crystalline Complex

    Ar/39Ar–mica and 207Pb/206Pb–zircon dates are presented and combined with existing P–T data and the sedimentary record. These data indicate that the RCC was faulted into three segments which underwent different e...

    A. Zeh, M. A. Cosca, H. Brätz, M. Okrusch… in International Journal of Earth Sciences (2000)

  6. No Access

    Article

    Phase relations of calcic amphibole–orthoamphibole–chlorite- talc assemblages, with applications to ultramafic rocks from the KTB pilot hole, Bavaria

     Lenses of ultramafic rocks intercalated within a metagabbro–amphibolite sequence were encountered in the KTB pilot hole. A pervasive metamorphic overprint formed the dominating assemblage calcic amphibole–ort...

    E. Schmädicke, M. Okrusch in Geologische Rundschau (1997)

  7. No Access

    Article

    Post-peak re-equilibration in a mafic gneiss from the KTB main hole: implications for the metamorphic evolution

     Detailed microprobe investigations were carried out on mineral phases of a mafic garnet–biotite–hornblende and garnet–biotite gneiss from the KTB main hole. The results indicate that the complex zonation patt...

    A. Zeh, M. Okrusch, H. Brätz in Geologische Rundschau (1997)

  8. No Access

    Article

    Orthogneisses in the Spessart Crystalline Complex, north-west Bavaria: Silurian granitoid magmatism at an active continental margin

    The Spessart Crystalline Complex, north-west Bavaria contains two orthogneiss units of granitic to granodioritic composition, known as the Rotgneiss and Haibach gneiss, respectively, which are structurally con...

    A. Dombrowski, M. Okrusch, P. Richter, F. Henjes-Kunst… in Geologische Rundschau (1995)

  9. No Access

    Article

    Talc-chlorite-amphibole felses of the KTB pilot hole, Oberpfalz, Bavaria: Protolith characteristics and phase relationships

    The metagabbro-amphibolite sequences in the KTB pilot hole contain intercalations of talc-chlorite-amphibole felses (or “hosbachites”), which show transitional contacts to the adjacent metagabbros. The hosbach...

    S. Matthes, M. Okrusch, U. Schüssler, P. Richter, K. von Gehlen… in Mineralogy and Petrology (1995)

  10. No Access

    Chapter

    Igneous Activity (Pre- to Early Variscan Magmatism)

    The metamorphic sequences constituting the MGCR frequently contain intercalations of metabasites. Judging from structural and textural relics, from rarely preserved magmatic minerals and from geochemical const...

    M. Okrusch, W. Schubert, S. Nasir in Pre-Permian Geology of Central and Eastern Europe (1995)

  11. No Access

    Chapter

    Stratigraphy, Structure, and Igneous Activity

    As laid out in Chapters V.B.1 and V.B.2, the parautochthonous Thuringian fades of the Saxothuringian Belt has been overthrust from the SE by nappes, which have survived in the core of the Vogtland Synform. The...

    W. Franke, H. Kreuzer, M. Okrusch… in Pre-Permian Geology of Central and Eastern… (1995)

  12. No Access

    Chapter

    Metamorphic Evolution

    During the Variscan orogenesis, most of the complexes forming constituents of the MGCR, were subjected to regional metamorphism under conditions generally ranging from the lower to the upper amphibolite facies...

    M. Okrusch in Pre-Permian Geology of Central and Eastern Europe (1995)

  13. No Access

    Article

    Sulphide mineralogy, metamorphism and deformation in the Matchless massive sulphide deposit, Namibia

    The sulphide mineralogy of the Matchless massive sulphide deposit has been reviewed and the morphology, mineral chemistry and paragenesis of the opaque minerals described and related to genetic processes. Amph...

    N. J. Cook, R. Klemd, M. Okrusch in Mineralium Deposita (1994)

  14. No Access

    Article

    Phase relationships and fluid inclusions characteristics of the metamorphosed, stratiform sulfide deposit Matchless, Namibia

    Silikatparagenesen im Nebengestein der metamorphen, schichtgebundenen Kupferlagerstätte Matchless, Damara-Orogen, Namibia, ergeben Temperaturen zwischen 550 und 625 °C und Drucke von 6–8 kbar beim Höhepunkt de...

    R. Klemd, M. Okrusch in Geologische Rundschau (1990)

  15. No Access

    Chapter and Conference Paper

    Geochemical Characteristics of Metabasites in Different Tectonic Units of the Northeast Bavarian Crystalline Basement

    Comprehensive geochemical investigations of metabasites yielded constraints for a correlation of, or discrimination between the different tectonic units within the northeast Bavarian crystalline basement.

    M. Okrusch, E. Seidel, U. Schüssler… in The German Continental Deep Drilling Progr… (1989)

  16. No Access

    Article

    Paragenesis and petrogenesis of a corundum-bearing marble at Hunza (Kashmir)

    A calcite-marble containing gem-quality ruby is exposed in the Hunza Valley, northwestern part of the Karakoram mountains, Pakistan zone of Kashmir. The marble forms concordant intercalations within sillimanit...

    M. Okrusch, T. E. Bunch, H. Bank in Mineralium Deposita (1976)