| | Journal (article/letter/editorial) | Stein Institut fuÈr Mineralogie, TU Darmstadt, Federal Republic of Germany With 8 Figures Received July 12...re, amphibolite to granulite facies stage and a younger low-pressure, greenschist to amphibolite facies...high-temperature imprint. Both events reached amphibolite facies conditions. Metamorphism is correlated...an older, medium-pressure/high-temperature, amphibolite to granulite facies event (7±9 kbar, max. 800...and a younger, low-pressure, greenschist to amphibolite facies overprint (4.5 kbar, max. 650 C). Compressional | | | Journal (article/letter/editorial) | high grade metamorphic rocks of the Odenwald (SW Germany) provide data for the construction of PT-paths...Ruhr-Universitfit, Postfach 102 148, D-4630 Bochum, FR Germany and A. K~OHE, Institut ftir Geologie , Ruhr-Universitfit...Ruhr-Universitfit, Postfach 102 148, D-4630 Bochum, FR Germany. Manuscript received: 31. 5. 1990; accepted: 22....q KOpbt orpam~qeH paHnefi cwajIHefi, OTHOCSmeI]C~K ~eBOHy, pa3gHTI~e MarMaT~rqecKoro noaca OReHBaJIbRa...structure of the crust. Intrusion ages (K~RSCH et al., 1988) and K/Ar biotite and hornblende cooling ages | | | Journal (article/letter/editorial) | Technische Universität Darmstadt, Schnittspahnstr. 9, 64287 Darmstadt, Germany *Corresponding author,... Altenhöferallee 1, 60438 Frankfurt am Main, Germany Abstract: Seven eclogite samples from 223 to 584...amphibole, rutile, Na-rich plagioclase, quartz, K-feldspar, analcime, and diamond (contamination). Omphacite...exhumation above 600 C into the regime of amphibolite facies for several tens of Ma. Garnet shows very...fluids during retrogression is documented by K-feldspar and analcime in quartz. Key-words: crystal defects | | | Journal (article/letter/editorial) | Crystalline Complex, Mid-German Crystalline Rise, Germany: evidence for a so far unrecognised high-pressure...b Institut fur Am Hubland, D-97074 Wurzburg, Germany ¨ Mineralogie der UniÕersitat ¨ Wurzburg, ¨ ¨ Institut...Technische UniÕersitat ¨ Darmstadt, Schnittsphanstraße 9, D-64287 Darmstadt, Germany Received 14 November...kbar and 700 8C. P–T estimates on retrograde amphibolite-facies domains and on prograde mineral assemblages...¨ Erlangen, Schloßgarten 5a, D-91054 Erlangen, Germany. High-pressure metamorphic rocks such as eclogites | | | Journal (article/letter/editorial) | of Germany Laboratorium fuÈr Geochronologie, UniversitaÈt Heidelberg, Federal Republic of Germany With...predominant regional metamorphic formation of the amphibolite is postdated by the intrusion of the Frankenstein...intrusives and from seven amphibolites were dated by the K-Ar method, mainly using the 40Ar/39Ar technique. The...Frankenstein gabbro. The total argon ages of the amphibolite hornblendes are at about 359 Ma in the north...and 329 Ma, respectively). The southernmost amphibolite with a total argon age of 320 Ma shows an irregular | | | Journal (article/letter/editorial) | thermobarometry of granitoids from the Central Odenwald (Germany) and their implications for the geotectonic development... Institut fuÈr Mineralogie, TU Darmstadt, Federal Republic of Germany Geologisch-PalaÈontologisches Institut... UniversitaÈt Heidelberg, Federal Republic of Germany 2 With 6 Figures Received July 14, 1999; revised...a granodiorite in the northern part (K/Ar hornblende: 340 Ma; K/Ar biotite: 330-327 Ma). Similar rocks...are, however, ca. 5±10 Ma younger (K/Ar hornblende: 330-335 Ma; K/Ar biotite: 323-325 Ma; Kreuzer and | | | Journal (article/letter/editorial) | manganian andalusite and quartz, with the addition of K introduced by an aqueous fluid, according to: 6(Al0...and marbles, which were metamorphosed under amphibolite- to granulite-facies conditions (Searle & Malpas...low pressure (<0.4 GPa), and range from lower-amphibolite facies to greenschist-facies conditions (Gnos...phase at the granulite facies and partly at the amphibolite-facies conditions of retrograde metamorphism...sample BH7. The primary minerals are quartz, K-feldspar, manganian andalusite, manganian hematite, muscovite | | | Journal (article/letter/editorial) | metamorphic gneiss from the SW BergstraÈsser Odenwald/Germany H.-J. Leyk, M. Goll, and H. J. Lippolt Laboratory...Ruprecht-Karls University, Heidelberg, Federal Republic of Germany With 2 Figures Received August 27, 1999; revised...also muscovite-bearing varieties occur. Published K-Ar hornblende and biotite ages for these paragneisses...totalargon ages of 327.51.6 Ma correspond with the K-Ar biotite age of the neighbouring Heidelberg granite...Hornblende und Biotit solcher Paragesteine sind fruÈher K-Ar-Altersdaten zwischen 370 und 330 Ma ermittelt worden | | | Journal (article/letter/editorial) | Technische Universität Darmstadt, Schnittspahnstrasse 9, 64287 Darmstadt, Germany (dscheuv@geo.tu-darmstadt...muscovite–sillimanite zone, a K-feldspar–sillimanite zone, and a K-feldspar–cordierite zone, respectively...kyanite– staurolite zone and the muscovite- and K-feldspar–sillimanite zones coincides with an important...(b) to the activity of diffusion creep in quartz–feldspar layers, and (c) to accommodation of strain by...e areas. At still higher metamorphic grades (K-feldspar-cordierite zone), where the rheologically critical | | | Journal (article/letter/editorial) | 1971 The Odenwald Original-Beerbachite, a n Amphibolite-Hornfels of the P y r o x e n e - H o r n f e...the "beerbachite" (Chelius, 1892) from Odenwald/Germany geochemical and phase-petrological data arc given...due to blocks broken down from the surrounding amphibolite series. They are present high grade hornfelses...with increasing metamorphic grade from amphibolite to amphibolite-hornfels (containing hornblende) finally...respectively the orthopyroxene subfacies of the K-feldspar-cordierite-hornfels facies (Winkler, 1967) is | | | Journal (article/letter/editorial) | UniversitaÈt WuÈrzburg, WuÈrzburg, Federal Republic of Germany Institut fuÈr Geowissenschaften, UniversitaÈt Potsdam...Potsdam, Potsdam, Federal Republic of Germany 2 With 8 Figures Received August 15, 1999; revised version...There are large south-west ± north-east striking amphibolite trails. A minimum age for the basaltic protoliths...Max-Planck-Institut fuÈr Chemie, Mainz, Federal Republic of Germany 64 U. Poller et al. Der BergstraÈsser Odenwald...Metapelite, Metakarbonate, Metabauxite, Migmatite und Amphibolite intrudierten. Letztere sind entlang von fuÈnf | | Nasir, S., Okrusch, M., Kreuzer, H., Lenzt, H., H�hndorf, A. (1991) Geochronology of the Spessart Crystalline Complex, Mid-German Crystalline Rise. Mineralogy and Petrology, 44 (1) 39-55 doi:10.1007/bf01167099 | Journal (article/letter/editorial) | Universit~it W/irzburg, Wiirzburg, Federal Republic of Germany 2 Institute of Earth and Environmental Sciences...Geowissenschaften und Rohstoffe, Hannover, Federal Republic of Germany With 6 Figures Received June 28, 1990; accepted...accepted February 12, 1991 Summary New Rb-Sr and K-Ar datings help to clarify the geologic history of the Spessart...types of the Spessart Crystalline Complex yielded K-Ar dates mainly in the range 324 to 318 Ma, an interval...culmination of the Variscan deformation and amphibolite facies metamorphism. Zusammenfassung Geochronologie | | Reimold, W.U., Hoffmann, M., Hauser, N., Schmitt, R-T., Zaag, P.T., Mohr-Westerheide, T. (2016) A geochemical contribution to the discussion about the genesis of impact-related pseudotachylitic breccias: Studies of PTB in the Otavi and Kudu Quarries of the Vredefort Dome support the“In Situ Formation”hypothesis. South African Journal of Geology, 119 (3) 453-472 doi:10.2113/gssajg.119.3.453 | Journal (article/letter/editorial) | 10115 Berlin, Germany Humboldt Universität zu Berlin, Unter den Linden 6, 10099 Berlin, Germany Institute...Biodiversity Research, Invalidenstrasse 43, 10115 Berlin, Germany Institut für Erd- und Umweltwissenschaften, Universität...Karl-Liebknecht-Str. 24-25,14476, Potsdam-Golm, Germany e-mail: marie.hoffmann@mfn-berlin.de N. Hauser...Biodiversity Research, Invalidenstrasse 43, 10115 Berlin, Germany e-mail: ralf-thomas.schmitt@mfn-berlin.de; patrice...gneiss and amphibolite in the case of Kudu Quarry and various granitoids and a dolerite/amphibolite component | | | Journal (article/letter/editorial) | in the Hoher-Bogen shear zone (Bohemian Massif, Germany) Received: 23 March 1999 / Accepted: 25 August...garnet pyriclasite by dehydration of pyroxene amphibolite at T > 750±840 C and P < 10±13 kbar including...shearing led to the formation of mylonitic epidote amphibolite. The presence of lower crustal and mantle-derived...movements. Key words Pyriclasite ´ Granulite ´ Amphibolite ´ Shear zone ´ Metamorphism Dehydration ´ Hoher-Bogen...massif C. Bues Celtesstr. 14, D-85051 Ingolstadt, Germany G. Zulauf ()) Institut für Geologie und Mineralogie | | | Journal (article/letter/editorial) | in the Hoher-Bogen shear zone (Bohemian Massif, Germany) Received: 23 March 1999 / Accepted: 25 August...garnet pyriclasite by dehydration of pyroxene amphibolite at T > 750±840 C and P < 10±13 kbar including...shearing led to the formation of mylonitic epidote amphibolite. The presence of lower crustal and mantle-derived...movements. Key words Pyriclasite ´ Granulite ´ Amphibolite ´ Shear zone ´ Metamorphism Dehydration ´ Hoher-Bogen...massif C. Bues Celtesstr. 14, D-85051 Ingolstadt, Germany G. Zulauf ()) Institut für Geologie und Mineralogie | | | Journal (article/letter/editorial) | Wiirzburg, Am Hubland, D-8700 Wtirzburg, F. R. Germany. HOH, HflH FpaHO~HOpHTHOfi MarMbI THria S, BO3HHI~Ule...orthogneisses contain more or less deformed megacrysts of K-feldspar and quartz which can be interpreted as textural...1313 1271 1133 3 Old quarry Gartenberg Haibach R 1394 H 3888 4 Old quarry Steinbach hinter der Sonne...Sonne Alzenau R 0859 H 4212 1005 5 Old quarry Rauenthal Alzenau R 0938 H 4178 1026 6 7 Northwestern...4245 H 4138 1075 1326, 1327 8 a b c d 9 Old quarry p u b l i c swimmingpool Goldbach R 1124 H | | | Journal (article/letter/editorial) | Geo-Forschungs-Zentrum Potsdam, Telegrafenberg, O-1561 Potsdam/Germany Manuscript received: 5. 2. 91; accepted: 25. 11...due to crustal attenuation. Peak metamorphism (amphibolite/ greenschist facies) in the other sequences with...ZIMMERLE, 1976; DONSIMONI, 1981). Radiometric dating (K/AT on hornblendes, biotites and muscovites) generally...of outcrop / track Drest 1 l i Out0rops erg K=" q_'~" / rock type Heide ,dau ~ 30km~f Frankfurt...(Gauss-Kr~qer-coordinates) Albersweiler north, quarry 3428800 5454150 south, quarry 3428700 5453800 Burrweiler 3432600 | | | Journal (article/letter/editorial) | Applied Geosciences, TU Darmstadt, Schnittspahnstrasse 9, D-64287 Darmstadt Author of correspondence:...thermometry is consistent with a predominantly amphibolite-facies source. The most likely origin for the...siliciclastic material because, unlike MA quartz and feldspar, most heavy minerals are restricted to specific...metasedimentary rocks of the Buganda-Toro belt (gneiss, amphibolite, quartzite, slate, phyllite and IP cordierite...quartzite, gneiss; Lmf) and metabasite grains (e.g., amphibolite, prasinite; Lmb). Furthermore, a Principal Component | | | Journal (article/letter/editorial) | 21, D-55099 Mainz, Germany Thomas Besch, K6nigsallee 67, D-14193 Berlin, Germany Correspondence to: U...(Massonne and Schreyer, 1983; Anderle et al., 1990). The K - A r ages of 335-327 Ma dated by Ahrend et al. (1983)... plagioclase (An2o- 3o), biotite, + muscovite, _+K-fsp., + amphibole, _+garnet (alm6o, PYlz, spess23)...and metamorphic sills (metadiabases) Quartz, K-feldspar, plagioclase (An09-42), biotite, muscovite, apatite...(An3o-40), biotite, garnet, apatite _+quartz, ± K-feldspar, opaques Plagioclase (Anzo-ss), hornblende (different | | | Journal (article/letter/editorial) | and decreasing water activity in the gneiss. K-feldspar veining around plagioclase and quartz, symplectitic...intergrowth of biotite + quartz after orthopyroxene and K-feldspar, and fluid inclusion data suggests the presence...The study of the characteristic conversion of amphibolite-facies gneisses to charnockite along ductile...formation of arrested charnockite by conversion of amphibolite-facies gneiss heralds major changes in mineralogy...(3400 to 2500 my) and experienced a pervasive amphibolite facies metamorphism around 2500 my (Jayananda | | Schmädicke, E., Okrusch, M., Schubert, W., Elwart, B., Görke, U. (2001) Phase relations of calc-silicate assemblagesin the Auerbach marble, OdenwaldCrystalline Complex, Germany. Mineralogy and Petrology, 72 (1) 77-111 doi:10.1007/s007100170028 | Journal (article/letter/editorial) | Auerbach marble, Odenwald Crystalline Complex, Germany E. SchmaÈdicke1 , M. Okrusch2 , W. Schubert2 ,... Technische UniversitaÈt Darmstadt, Darmstadt, Federal Republic of Germany 2 Mineralogisches Institut...UniversitaÈt WuÈrzburg, WuÈrzburg, Federal Republic of Germany With 9 Figures Received July 29, 1999; accepted...1994) indicate metamorphic conditions of the amphibolite facies. A clockwise P-T path was suggested for...same range. Ar-Ar dating on hornblende from an amphibolite of unit II revealed a conformable cooling age | | | Journal (article/letter/editorial) | granites of the Kösseine massif (Fichtelgebirge, Germany): implications for the origin of granites Received:...radiogenic isotopes, the following is concluded: The amphibolite enclave (AE) and most of the aluminium silicate-bearing...und Geochemie, Technische Universität München, Germany Lichtenberg str. 4 D-85747 Garching Fax: #089 289...Geowissenschaften und Rohstoffe, Stilleweg, D-30655 Hannover, Germany Fax: #0511 643 2304 E-mail: axel.hoehndorf@bgr...The G3K granite also occurs in the Wolfsgarten quarry in the southern part of the Grosser Kornberg (Fig | | Steffenssen, Georg, Müller, Axel, Munnik, Frans, Friis, Henrik, Erambert, Muriel, Kristoffersen, Magnus, Rosing-Schow, Nanna (2020) Unusual scandium enrichments of the Tørdal pegmatites, south Norway. Part I: Garnet as Sc exploration pathfinder. Ore Geology Reviews, 126. 103729pp. doi:10.1016/j.oregeorev.2020.103729 | Journal (article/letter/editorial) | Physics and Materials Research, 01328 Dresden, Germany d University of Oslo, Department of Geosciences...mined for mica, ama zonite (green variety of K-feldspar) and molybdenite during World War II. For the...(Bergstøl and Juve, 1988). Major minerals are K-feldspar, quartz, oligoclase, albite, biotite, and muscovite...based on K-feldspar colors: the green K-feldspar (amazonite), white K-feld spar, and pink K-feldspar zones...zones (Fig. 2). Pegmatites with pink K-feld spar represent the most primitive, commonly unzoned pegmatites | | | Journal (article/letter/editorial) | Tiibingen, D-7400 Tiibingen (Federal Republic of Germany) (Received July 14, 1982; revised and accepted...Evje-Iveland area (Fig. 2), long noted as sources of feldspar for the ceramic industry (e.g., Andersen, 1926)... +9 .2 +8.4 GA pegmatite at large Landsverk quarry +8. 7 +7.3 (GA)-l qtz-ab pegmatite; mottled...granite at contact with amphibolite +8.6 graphic granite at contact wi th amphibolite +8 .9 V coarse-gr...present H-6 amphibolite wall Kiawa pegmatite, Petaca district, Rio Arriba County, New Mexico: K-57 coarse-gr | | Kr�ner, A., Willner, A.P., Hegner, E., Frischbutter, A., Hofmann, J., Bergner, R. (1995) Latest precambrian (Cadomian) zircon ages, Nd isotopic systematics and P-T evolution of granitoid orthogneisses of the Erzgebirge, Saxony and Czech Republic. Geologische Rundschau, 84 (3) doi:10.1007/bf00284512 | Journal (article/letter/editorial) | large parts of the central and south-eastern EG Germany in both Saxony and the Czech Republic (Fig. 1)...in the Erzgebirge. Much of the D-44801 Bochum, Germany discussion centered on the origin, age and tectono-meE...other units Wilhelmstrasse 56, D-72074 Ttibingen, Germany of the Variscan belt of east-central Europe (e...Potsdam, Telegrafenberg A50, D-14473 Potsdam, Germany Gotte and Schust (1988) have provided a historical...Geologie, TU Bergakademie Freiberg, D-09596 Freiberg, Germany these enigmatic rocks. The proponents of a sedimenta- |
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