 | | Journal (article/letter/editorial) | | rocks from the Mozambique belt of SW Tanzania H. Sommer a,⁎, A. Kröner a, b a b Institut für Geowissenschaften...Geowissenschaften, Universität Mainz, D-55099 Mainz, Germany Beijing SHRIMP Centre, Institute of Geology, Chinese...granitoid gneisses and amphibolite-facies metapelites. Lower-grade amphibolite-facies rocks are rare and can...conditions. These are higher temperature and slightly lower pressure conditions than reported for other granulite-facies...in East Africa and Madagascar, together with the lower grade Arabian-Nubian Shield of NE Africa and Arabia |  | | Journal (article/letter/editorial) | | regional distribution of writing-sand types in SW-Germany and northern Switzerland, 14th to 19th century...Universität Berlin, Malteserstr. 74-100, 12249 Berlin, Germany *Corresponding author, e-mail: milke@zedat.fu-berlin...samples used from the 14th - 19th century in SW-Germany and northern Switzerland are analysed by petrographic...unexpected finding from this inquiry is a region in SW-Germany where artificially prepared black sands, including...came to southern Germany in the late 14th century. The first paper mill in Germany started its operations |  | | Journal (article/letter/editorial) | | petrological, geochemical and geochronological approach H. Sommer, A. Kröner, J. Lowry PII: DOI: Reference: S0024-4937(17)30184-6...2016 21 May 2017 Please cite this article as: Sommer, H., Kröner, A., Lowry, J., Neoproterozoic eclogiteto...Geowissenschaften, Universität Mainz, 55099 Mainz, Germany Present address: School of Geography, Earth Science...et al., 1998; Sommer et al., 2003, 2008; Sommer and Kröner, 2013). Together with the lower grade SC RI...Muhongo et al., 2001; PT Kröner et al., 2003; Sommer et al., 2003, 2005a,b; Collins et al., 2012; De |  | Sommer, H., Kröner, A., Hauzenberger, C., Muhongo, S., Wingate, M. T. D. (2003) Metamorphic petrology and zircon geochronology of high-grade rocks from the central Mozambique Belt of Tanzania: crustal recycling of Archean and Palaeoproterozoic material during the Pan-African orogeny. Journal of Metamorphic Geology, 21 (9) 915-934 doi:10.1111/j.1525-1314.2003.00491.x | Journal (article/letter/editorial) | | Geowissenschaften, Universität Mainz, D-55099 Mainz, Germany (sommerh@mail.uni_mainz.de) 2 Dept. of Geology...(Mozambique, Malawi, Madagascar, Tanzania, Kenya) and lower * Present address: Institut für Mineralogie, Universität...crustal terranes of the MB in East Africa and the lower grade, middle to upper crustal PanAfrican terranes...1991; Stern, 1994; Shackleton, 1996). 915 916 H. SOMMER ET AL. Fig. 1. Simplified geological map of the...within large shear zones (Muhongo, 1999). 918 H. SOMMER ET AL. Thermobarometric studies on high-grade |  | | Report (issue) | | photograph: Micaceous schist in the Wandel Park quarry near Toodyay. Contents Abstract ......................................................... 17 Germany ...................................................................... 101 Kaolinitic clay in a quarry near Muchea .....................................Geology of the area around Bootenall and Mount Sommer ....................................................... 126 Micaceous schist in the Wandel Park quarry near Toodyay ................................. |  | | Journal (article/letter/editorial) | | vermiculite were mined from Mikese in Morogoro Rural District and processed in Dar-esSalaam where an experimental...quality is to be found at Kwekivu area in Kilindi District but it is not mined due to the high costs associated...Ethiopia, through Kenya and Tanzania, to Mozambique (Sommer et al., 2003). Holmes (1951) was the first to recognize...it is a ~1000 km long discontinuous linear belt (Sommer et al., 2005) stretching in a N S direction from...metamorphism in the belt occurred at ~640 620 Ma (Sommer et al., 2005). Vermiculite from Tanzania A large |  | | Journal (article/letter/editorial) | | calcite with subordinate apatite, magnetite, ilmenite, biotite, baddeleyite, zircon, rutile, 23 pyrochlore-like...interval of 114 600-587 Ma (Liz et al., 2005; Sommer et al., 2006; Gastal et al., 2006). 115 The four...172 calcite with accessory apatite, magnetite, ilmenite, rutile, zircon, baddeleyite, barite, 173 thorite...with layers of abundant 185 calcite, apatite, ilmenite and magnetite intergrowth, with enriched layers... 191 matrix comprised of calcite, magnetite, ilmenite, rutile, apatite and pyrite. Carbonatites 192 |  | Machado, Adriane, de Lima, Evandro Fernandes, Chemale, Farid, Alexandre, Felipe Marcelo, Sommer, Carlos Augusto, Figueiredo, Ana Maria Graciano, Almeida, Delia del Pilar Montecinos de (2008) Mineral Chemistry of Volcanic Rocks of South Shetland Archipelago, Antarctica. International Geology Review, 50 (2) 154-162 doi:10.2747/0020-6814.50.2.154 | Journal (article/letter/editorial) | | b , Felipe Marcelo Alexandre , Carlos Augusto Sommer , Ana c Maria Graciano Figueiredo & Delia del...Chemale , Felipe Marcelo Alexandre , Carlos Augusto Sommer , Ana Maria Graciano Figueiredo & Delia del Pilar...CHEMALE JR., FELIPE MARCELO ALEXANDRE, CARLOS AUGUSTO SOMMER, Institute of Geosciences, Federal University of...plagioclase, augite, olivine, Ti-magnetite, and ilmenite phenocrysts. Geochemistry studies indicate that...relative to HREE. The Ni, Cr, Co, and MgO contents are lower than primary compositions, and demonstrate that |  | Tamblyn, R., Brown, D., Hand, M., Morrissey, L., Clark, C., Anczkiewicz, R. (2021) The 2 Ga eclogites of Central Tanzania: Directly linking age and metamorphism. Lithos, 380. 105890pp. doi:10.1016/j.lithos.2020.105890 | Journal (article/letter/editorial) | | magmas, which intruded between ca. 1940–1877 Ma (Sommer et al., 2005a). The calc-alkaline volcanics of...group also formed at this time (ca. 1920–1870 Ma; Sommer et al., 2005a; Bahame et al., 2016). An early...from metapelitic rocks of the Isimani Suite has a lower intercept age of 501 ± 26 Ma (Möller et al., 1995)...clinopyroxene, hornblende, plagioclase, quartz, rutile, ilmenite, magnetite, titanite, epidote, apatite and zircon...and titanite, and rare clinopyroxene, epidote, ilmenite, apatite and zircon (Fig. 2a,e,f). It is separated |  | REN, M, OMENDA, P, ANTHONY, E, WHITE, J, MACDONALD, R, BAILEY, D (2006) Application of the QUILF thermobarometer to the peralkaline trachytes and pantellerites of the Eburru volcanic complex, East African Rift, Kenya. Lithos, 91 (1) 109-124 doi:10.1016/j.lithos.2006.03.011 | Journal (article/letter/editorial) | | fayalite + ferrohedenbergite + aenigmatite ± quartz ± ilmenite ± magnetite ± pyrrhotite ± pyrite. In the pantellerites...apatite, although fayalite, ferrohedenbergite and ilmenite are absent from more evolved rocks (e.g. with...assemblages containing fayalite, clinopyroxene, ilmenite, and quartz, making the use of the QUILF thermometer...of crust in the Kenya Dome reflects a 7 km thick lower crustal layer that has a P-wave velocity of 6.8...133868) for Al2O3 and Na2O; and Ilmen Mountains Ilmenite (USNM 96189) for TiO2, MnO, and FeO. For volatile |  | | Journal (article/letter/editorial) | | of the Continental Deep Drilling Project (KTB/Germany) Received: 20 July 1996 / Accepted: 22 November...Potsdam, Telegrafenberg A50, D-14473 Potsdam, Germany Fax: #0331 288 1436 E-mail: pemoe@gfz-potsdam.de...incorporated into secondary minerals of either lower or higher solubility. The leaching results on KTB...minerals are K-feldspar, apatite, zircon, titanite, ilmenite, rutile, and pyrrhotite (Röhr et al. 1990; Schalkwijk...constituent of biotite, chlorite, garnet, and ilmenite (Grawinkel et al. 1993) and high Mn concentrations |  | Sommer, Frank, Maschowski, Christoph, Dietze, Volker, Grobéty, Bernard, Gieré, Reto (2016) Comparing single-particle analysis data of volcanic ash of the 2010 Eyjafjallajökull eruption obtained from scanning electron and light microscope images. European Journal of Mineralogy, 28 (5) 855-868 doi:10.1127/ejm/2016/0028-2555 | Journal (article/letter/editorial) | | Universität Freiburg, Geowissenschaften, 79104 Freiburg, Germany *Corresponding author, e-mail: franksommer@t-online...Medizin-Meteorologische Forschung, 79104 Freiburg, Germany 3 Université de Fribourg, Département des Géosciences..._gsw.pdf by Uppsala Universetet user 856 F. Sommer et al. that was deposited during the eruption..._gsw.pdf by Uppsala Universetet user 858 F. Sommer et al. Fig. 2. Images of the same field of view...in the pattern of the re-suspended ash sample is lower than those of the ground sample, thus producing |  | Spišiak, Ján, Vozárová, Anna, Vozár, Jozef, Ferenc, Štefan, Šimonová, Viera, Butek, Juraj (2021) Implication of Mineralogy and Isotope Data on the Origin of the Permian Basic Volcanic Rocks of the Hronicum (Slovakia, Western Carpathians) Minerals, 11 (8) 841 doi:10.3390/min11080841 | Journal (article/letter/editorial) | | from the Liptovská Teplička Village, abandoned quarry along the Šuňava-Liptovská Teplička road, 890...andesite-1st eruption phase Benkovský potok Valley, small quarry at the left side of the forest road, 832 m a.s...M-9 andesite/basalt-2nd eruption phase Kvetnica quarry, 725 m a.s.l. 49◦ 00.5210 N 20◦ 17.0850 E 2....the latter to the Oberostalpine-type). Jurassic-Lower Cretaceous sediments are preserved only locally...part of the lower by findings of some mylonitized granitoid tectonic the basal of the Ma) lower partial Hronicum |  | | Journal (article/letter/editorial) | | al. 1995; Vrána et al. 2004; Fritz et al. 2005; Sommer et al. 2005); the Mesoproterozoic–Neoproterozoic...2001; Sommer et al. 2003; Tenczer et al. 2006; Vogt et al. 2006; Hauzenberger et al. 2007; Sommer & Kröner...sillimanite, cordierite, spinel and magnetite/ilmenite (sample 31874). (c) Coarse cordierite with very...Mg/(Mg + Fe)). The oxide phases are magnetite and ilmenite, locally composite with exsolved lamellas. Two...variably the presence of accessory rutile, titanite, ilmenite and magnetite (samples 31310, 31317, 31318, 31825; |  | | Journal (article/letter/editorial) | | possible water reservoir in the Earth’s mantle? H. Sommer & K. Regenauer-Lieb & B. Gasharova & D. Siret ...which is located Editorial handling: A. Beran H. Sommer : K. Regenauer-Lieb Institut für Geowissenschaften...Geowissenschaften, Universität Mainz, 55099 Mainz, Germany H. Sommer (*) Department of Geology, University of Botswana...Forschungszentrum Karlsruhe, P.O. Box 3640, 76021 Karlsruhe, Germany within point defects in the olivine crystal structure...synchrotron at the Forschungszentrum Karlsruhe, Germany, which provides high-brilliance, diffraction-limited |  | | Journal (article/letter/editorial) | | at buffering sulphide to low levels (Pyzick and Sommer, 1981; Canfield, 1989). Low levels of dissolved...(uncoated) "Reactive" silicates Sheet silicates Ilmenite, garnets, augite, amphibole Rate constant (yr...fossils are consistent with model predictions. In the lower, sulphide-dominated zone of diagenesis the extent...Cosmochim. Acta, 55: 3581-3595. Pyzick, A.J. and Sommer, S.E., 1981. Sedimentary iron monosulfides: Kinetics |  | | Journal (article/letter/editorial) | | estimates can be obtained from titanomagnetite-ilmenite pairs containing appreciable quantities of minor...preserved as glass inclusions in tephra phenocrysts (Sommer 1977; Druitt et al. 1982). Suitable inclusions...samples studied contain equilibrium mineral pairs of ilmenite and titanomagnetite, and temperatures have thus...the Fe z +-Mg exchange between clinopyroxene and ilmenite (Bishop 1980). Agreement is generally very good...clinopyroxene-ilmenite geothermometer (Bishop 1980), for those deposits where titanomagnetite, ilmenite and augite |  | | Journal (article/letter/editorial) | | 1990; EBNER et al, 2004). In the LobmingGraben, Sommer-Graben and Au-Graben of the Preger Massif, cryptocrystalline...SiO2, Fe2O3 and CaO in the range of around 3 wt% lower the quality of magnesite. The magnesite of Kraubath...symplectites. Trace minerals are potassium feldspar, ilmenite, titanite, rutile, pyrite, zircon, apatite, allanite...garnet with inclusions of quartz, amphibole and ilmenite/rutile. Amphibole (green-‐brown), omphacite (greenisch-‐blue)...belt at the NW rim of Gondwana. In Silurian to Lower Devonian times this crustal segment of magmatic-sedimentary |  | | Journal (article/letter/editorial) | | 1990; EBNER et al, 2004). In the LobmingGraben, Sommer-Graben and Au-Graben of the Preger Massif, cryptocrystalline...SiO2, Fe2O3 and CaO in the range of around 3 wt% lower the quality of magnesite. The magnesite of Kraubath...symplectites. Trace minerals are potassium feldspar, ilmenite, titanite, rutile, pyrite, zircon, apatite, allanite...garnet with inclusions of quartz, amphibole and ilmenite/rutile. Amphibole (green-‐brown), omphacite (greenisch-‐blue)...belt at the NW rim of Gondwana. In Silurian to Lower Devonian times this crustal segment of magmatic-sedimentary |  | Maheshwari, Anil, Coltorti, Massimo, Rajput, Sandeep K., Verma, Mukesh (2009) Geochemical characteristics, discrimination and petrogenesis of Neoproterozoic peralkaline granites, Barmer District, SW Rajasthan, India. International Geology Review, 51 (12) 1103-1120 doi:10.1080/00206810902895337 | Journal (article/letter/editorial) | | of Neoproterozoic peralkaline granites, Barmer District, SW Rajasthan, India a b a Anil Maheshwari...of Neoproterozoic peralkaline granites, Barmer District, SW Rajasthan, India, International Geology Review...of Neoproterozoic peralkaline granites, Barmer District, SW Rajasthan, India Anil Maheshwaria*, Massimo... 2002; Guimaraes et al. 2005; Azer 2006, 2007; Sommer et al. 2006; Vernikovskaya et al. 2006; Katzir...peralkaline rocks representing the MIS in Barmer district of southwestern Rajasthan are around Siwana, Mungeria |  | Schilling, J., Frost, B. R., Marks, M. A. W., Wenzel, T., Markl, G. (2011) Fe-Ti oxide-silicate (QUIlF-type) equilibria in feldspathoid-bearing systems. American Mineralogist, 96 (1) 100-110 doi:10.2138/am.2011.3596 | Journal (article/letter/editorial) | | Tübingen, Wilhelmstrasse 56, D-72074 Tübingen, Germany 2 Department of Geology and Geophysics, University...evolution of magmatic systems containing magnetite and ilmenite with olivine, quartz, or pyroxenes. In this paper...orthomagmatic assemblage of titanomagnetite + ilmenite + feldspar + nepheline + compositionally variable...NaAlSiO4+4FeTiO3+2Fe2SiO4 Albite Ulvøspinel Nepheline Ilmenite Fayalite The AUNIlF reference curve (with unit...AUNIlF equilibrium is shifted to lower oxygen fugacities and ilmenite becomes unstable relative to ulvøspinel |  | | Journal (article/letter/editorial) | | pyroxene larger crystals. Common significantly lower content of the forsterite component (Fo62, Table...gabbro cumulates. Olivine is the cores and display lower Mg contents (Fo65‐60) thatHowever, suggestitaisre‐equilibration...to the cores, which indicates their formation at lower pressures. Except for the significant change in...component (Fo85), whereas the rims a significantly lower high content of of the olivine forsterite phenocrysts...(Pl—plagioclase, Ol—olivine, Cpx—clinopyroxene, Ilm—ilmenite, Ne—nepheline); the numbers figures correspond |  | | Journal (article/letter/editorial) | | Frankfurt, Altenhöferallee 1, D-60438 Frankfurt, Germany volumetrically small they are an important and...They are derived from a wide depth range from the lower crust to the base of the lithosphere. Their protoliths...Jacob 2004; Dongrea et al. 2015; Shu et al. 2016; Sommer et al. 2017). Jacob et al. (2009) took low oxygen...al. (2009) describe one kyanite bearing sample. Ilmenite (ilm; Fig. 1a) and sulfides occur in a number...Analytical techniques The silicate phases and ilmenite were analyzed for major and trace elements, and |  | Sommer, Carlos Augusto, De Lima, Evandro Fernandes, Nardi, Lauro Valentim Stoll, De Liz, Joaquim Daniel, Waichel, Breno LeitãO (2005) Neoproterozoic, Mildly Alkaline, Bimodal Volcanism in Southern Brazil: Geological and Geochemical Aspects. International Geology Review, 47 (10) 1090-1110 doi:10.2747/0020-6814.47.10.1090 | Journal (article/letter/editorial) | | Geological and Geochemical Aspects a a Carlos Augusto Sommer , Evandro Fernandes De Lima , Lauro a a Valentim...Jun 2011. To cite this article: Carlos Augusto Sommer , Evandro Fernandes De Lima , Lauro Valentim Stoll...Geological and Geochemical Aspects CARLOS AUGUSTO SOMMER,1 Instituto de Geociências, Universidade Federal...Michigan University] at 03:41 25 December 2014 1092 SOMMER ET AL. (Paim et al., 2000; Wildner et al., 2002)...mainly by effusive and pyroclastic flow deposits (Sommer et al., 1999; Wildner et al., 1999; Almeida et |  | Sindern, S., Havenith, V., Gerdes, A., Meyer, F. M., Adelmann, D., Hellmann, A. (2019) Dating of anatase-forming diagenetic reactions in Rotliegend sandstones of the North German Basin. International Journal of Earth Sciences, 108 (4) 1275-1292 doi:10.1007/s00531-019-01705-x | Journal (article/letter/editorial) | | two wells in NW-Germany. Anatase grew after breakdown of detrital Ti-phases (e.g. ilmenite) although local...Aachen, Germany 2 ShinEtsu, SE Tylose GmbH & Co. KG, Rheingaustr. 190‑196, 65203 Wiesbaden, Germany 3 ...Frankfurt, Germany 4 Wintershall Holding GmbH, Friedrich‑Ebert‑Str. 160, 34119 Kassel, Germany Diagenetic...Rotliegend II sandstones of a tight gas field in NW Germany and to elaborate the application of the LA-ICP-MS...setting The study area is located in East Frisia, NW Germany, to the east of the Ems Graben and the Groningen |
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