 | | Journal (article/letter/editorial) | | these rocks have been considered an ophiolite (Ehrenberg, 1975; Sharp, 1988; Edelman et al., 1989, Saleeby...area (Fig. 2). Williams and Smyth (1973) and Ehrenberg (1975) proposed that these high-grade metamorphic... and locally anthophyllite, with antigorite (Ehrenberg, 1975, this study). The tremolite reaches a centimeter...generally representative of the FRB as a whole (Ehrenberg, 1975). Crustal rocks within the ultramaïŹc body...amphibolite that have been called the internal schists (Ehrenberg, 1975). Saleeby et al. (1989) obtained a U/Pb |  | | Report (chapter) | | and the plagioclases were rimmed by chlorite and epidote. Upper mantle xenoliths show similar histories...would imply that the volatiles were not juvenile (Ehrenberg 1982). The prolific xenolith suites in both rock...(1979), Hunter & Smith (1981), Ehrenberg (1978), (1982) and Ehrenberg & Griffin (1979). Most of the crystalline...crust has been hydrated whereas other authors (Ehrenberg & Griffin 1979; Padovani et al. 1982) suggest...first to clinozoisite and sericite and then to epidote, muscovite, chlorite albite and quartz. Sillimanite |  | | Report (issue) | | kindly furnished the early history of the La Paz district, and Mr. Edward Beggs, of Quartzsite, gave much...reservation line. In his report he mentions the La Paz district and briefly describes placers in the Plomosa Mountains...area of granite similar to that in the La Paz district. The metamorphosed sedimentary and igneous rocks...beds. Granite gneiss, amphibolite schist, quartz-epidote schist, and granite comprise the larger igneous...distance east of the area here considered. Quartz-epidote schist. A greenish-gray to black schistose porphyritic |  | | Journal (issue) | | l\:Iorar 31 III.-Geological Map of the !l-1orar District, Western Invernessshire 44 V PLATE IV.-Devonian...anomaly of this kind occurs in the Melton Mowbray district {Hallimond 1930 a). Experience in the various...matites of West Cumberland, Lancashire and the Lake District. lrfem. Geol. Surv. Min. Resources, vol. Vlll...other things that the impregnated turf of the district had been ernployed by the country people as a...Naegeli ex Klitzing, Ei1,notia diodon Ehrenberg, E. lunaris (Ehrenberg) Grunow, E. tenella (Grunow) Hustedt |  | | Report (issue) | | former district geologist and was completed under the supervision of R. C. Heath, district geologist...geologist, New York District. SUMMARY OF STRATIGRAPHY OF SOUTHERN SUFFOLK COUNTY Precambrian-Paleozoic(~) bedrock...samples except in a few, where they are rare. Epidote is common to abundant in four samples and rare...and Groot and Glass, 1960). The association of epidote, staurolite, chloritoid, and garnet in various...R R Staurolite ________ C C-A C C C R C-R C-R Epidote --------- R C-A C-A R C-A R C-R C Chloritoid________ |  | | Book | | character of the rock and the formation of yellow epidote and pyrite. Iron garnets are occasionally present...GEOLOGY 21 of zircon and rutile. Traces of epidote, andalusite, chlorite, and biotite were noted....slightly rounded, and contain numerous inclusions. Epidote minerals, pistacite and clinozoisite, begin to...is the abrupt appearance of an abundance of the epidote minerals in the basal part (Figs. 2 and 3). The...classified as the Epidote-Garnet-Titanite zone. From 3507 to 2313 feet, a zone containing Epidote-Titanite-Sillimanite |  | | Journal (article/letter/editorial) | | planktonic species: Coscinodiscus marginatus Ehrenberg, Thalassionema nitzschioides Grunow, Asteromphalus...polymorphus var. frigida Grunow, H. polycystinorum Ehrenberg) and Stephanogonia are fairly The siliceous tuffs...potassic feldspar (10-15%), chlorite (up to 10%), epidote and zoisite (up to 3%). The angular fragments make...plagioclase, chlorite, pyro xene, hornblende, and epidote-zoisite of fine silty to silty-pelitic grain size...Coscinodiscus (C. marginatus Ehrenberg, C. perforatus Ehrenberg, C. aff. asteromphalus Ehrenberg), Paralia sulcata |  | Jones, D.M., Kingston, M.J., Marlow, M. S., Cooper, A. K., Barron, J.A., Wingate, F.H., Arnal, R.E. (1981) Age, mineralogy, physical properties, and geochemistry of dredge samples from the Bering Sea continental margin. Open-File Report Vol. 1981 (81-1297) US Geological Survey doi:10.3133/ofr811297 | Report (issue) | | zeolite. 65% of glass, 33% of VRF3 are fresh. T epidote* Matrix == clay, glass, plag. Sample altered. ...Matrix = clay, glass. Glass rounded, fresh. T epidote, biotite* Matrix = clay. Tb±otite . Major components...glass Cpx = clinopyroxene Ol. = olivine Ep. = epidote Chl. = chlorite Leuc. = leucoxene 86 groundmass2...atlantica Gleser and Jouse Hemiaulus polyoystinorum Ehrenberg MelosifVL arahiteaturalis Brun Pseudotriceratiwn...Distephanus crux daruinii Bukry D. speculum (Ehrenberg) Haeckel (cannopilean) Mesooena apieulata (schulz) |  | | Report (volume) | | first such examination was that of the Red Butte district, which is on the west side of the range about...report (1940) on the Bottle Creek quicksilver district gives an excellent description of the geology...sampled the quicksilver deposits in the Bottle Creek district as part of a statewide investigation of quicksilver...to sericite and clay in some specimens, and to epidote and clinozoisite in others; 10 to 20 percent pyroxene...albitization of the plagioclase and the clinozoisite, epidote, and chlorite in these rocks are probably products |  | | Report (issue) | | determinations on related rocks in tl}e, Bishop district to the .s<::mth and on potassium-argon age determfnations...produced sporadically from mines of the Mammoth district in the Sierra Nevada near the west boundary of...somewhat .similar to the highly productive Bishop district; it contains a few small mines and prospects that...the calcic rocks. The presence of considerable epidote in the calcic rocks and the occurrence of · tremolite...dynamic change, a fact shown by "eyes" and veins of epidote and subordinate quartz and garnet a fraction of |  | | Journal (article/letter/editorial) | | from geothermal systems in Iceland. SMITH and EHRENBERG ( 1989) show trends of log Pco2vs.temperature...of Pco,vs. temperature, reported by SMITH and EHRENBERG(1989), can be compared to trends predicted by...Gulf Coast and the North Sea, where SMITHand EHRENBERG ( 1989) report a nearly linear relationship between...trend of Pco,vs.temperature reported by SMITHand EHRENBERG( 1989) to calculate pH at reported reservoir temperatures...waters sampled. In addition, they report that epidote is observed, especially at higher temperatures |  | Condie, Kent C, Latysh, Natalie, Van Schmus, W.R, Kozuch, Marianne, Selverstone, Jane (1999) Geochemistry, Nd and Sr isotopes, and U/Pb Zircon ages of Granitoid and Metasedimentary Xenoliths from the Navajo Volcanic Field, Four Corners area, Southwestern United States. Chemical Geology, 156 (1) 95-133 doi:10.1016/s0009-2541(98)00176-4 | Journal (article/letter/editorial) | | 1990.. They also have been reported in Mexico, Germany, the Mojave desert, and the Rio Grande rift ĆœRoberts...xenoliths are widespread ĆœMcGetchin and Silver, 1972; Ehrenberg and Griffin, 1979; Broadhurst, 1986; Wendlandt...in some cases, epidote. Many of the crustal xenoliths, however, are pristine. Ehrenberg and Griffin Ćœ1979...Getchin and Silver, 1972; McGetchin et al., 1977; Ehrenberg and Griffin, 1979; Broadhurst, 1986; Selverstone...K-feldspar are variably altered to sericite and epidote, and in some cases these minerals nearly completely |  | | Journal (article/letter/editorial) | | feldspar, hornblende, magnetite, augite, zircon, epidote, tourmaline, garnet, and other minerals in smaller...the grains average 1 mm. in diameter. In 1855 Ehrenberg first showed the relationship between greensand...shellsin the Eoceneat Fort Washington-,Maryland. Ehrenberg attributes the formation of greensandsto the filling |  | | Report (volume) | | greenschist-hornfels facies, characterized by chlorite, epidote, amphibole, and quartz. Overall, metamorphic grade...smectite, laumontite, chlorite, and, more rarely, epidote. Rare microfossils occur as ghosts or are strongly...composed of quartz and minor amounts of prehnite, epidote, zeolites, and celadonite. Much interpillow sediment...abundant prehnite and pumpellyite and accessory epidote, chlorite, and stilpnomelane. Pumpellyite replaces...vesicles are filled with quartz, chlorite, minor epidote, feldspar, pyroxene, and prehnite. Pyrite veins |  | | Journal (article/letter/editorial) | | (Helmstaedt et al., 1972; Smith and Levy, 1976; Ehrenberg, 1978; Eh- Mafic xenoliths from the Colorado...occurring as veinlets and microcrack fillings. Ehrenberg and Griffin (1979) and Broadhurst (1986) report...alteration, in agreement with the findings of Ehrenberg and Griffin (1979) and Broadhurst ( 1986). Below...is often completely altered to clinozoisite or epidote. Amphibolite xenoliths are composed chiefly of...during the one or more periods of alteration (Ehrenberg and Griffin, 1979; Broadhurst, 1986). We found |  | | Report (issue) | | lead-silver-zinc district ______________ _ Geochemical prospecting ___ ._ ____________ _ Future of the district ___________________...___________________ _ Zinc Hill district ___________________________ _ Lee district _______________________________...acknowledgments _________ _ Deposits in the Darwin district ______________ _ Geology~------------------------------...Durham, Fernando, and St. Charles mines, Darwin district, Calif. Page FIGURE 1. 2. 3. 4. 5. 6. 7. 8....____________ Geologic column of the Zinc Hill district---------------------------------------------- |  | | Journal (article/letter/editorial) | | x 91. Loc. 3. 22.âPseudotextularia globulosa (Ehrenberg), X 91. Loc. 11. 23.âEouvigerina cretacea (Heron-Allen...Earland), X 91. Loc. 11. 24a, b.âGlobigerina aspera (Ehrenberg), X 91. Loc. 11. 25a, 6.âGyroidina micheliniana...there is much more late secondary quartz and also epidote associated with the amphibole. While some patches...surface. The amphibole and its associated quartz and epidote are also clearly secondary and connected with these...series and associated gneisses of the West Nile District of Uganda has yielded some relevant facts. The |  | | Journal (article/letter/editorial) | | less stable heavy minerals assemblage, including epidote, sphene, apatite and Fe-Ti oxides is preserved...polymorphs, as indicated by XRD and SEM analyses (Ehrenberg et al., 1993; Morad et al., 1994). Kaolin is abundant...kaolin (e.g., Schulz-Rojahn and Phillips, 1989; Ehrenberg, 1991), or by other clay minerals (e.g., Dutton...illitization than interstitial vermicular kaolinite (cf. Ehrenberg et al., 1993), probably due to local availability...under deep burial (Bjarkum and Gjelsvik, 1988; Ehrenberg and Nadeau, 1989; Bjorlykke and Aagaard, 1992; |  | | Book | | Congress Catalog Card No. 66-17809 Printed in Germany 08 011635 3 PREFACE TO THE T H I R D (GERMAN)...N , Troy, New York, USA G. FRIEDRICH, Aachen, Germany H . FROHBERG, Toronto, Canada R. L A GANZA, North...Pullman, Washington R. A. ZIMMERMANN, Heidelberg, Germany 2 Bamdohr, Theorie Minerals XVĂ ABBREVIATIONS... FIG. 2 y2 X , drawing Sohland on the Spree, Germany 6 RAMDOHR So-called "pipe ore". The drops of... 18 550 X, oil. imm. Finkenberg near Bonn, Germany RAMDOHR Sphalerite from a basalt inclusion. The |  | | Journal (article/letter/editorial) | | not greater than that represented by the albite-epidote-amphibolite facies of regional metamorphism. After...been replaced grains of clinozoisite and common epidote up to 0.4 to some extent by calcite, and mortar...comabout 15 per cent. position. Some clinozoisite and epidote grains are Calcite: generally occurs as imperfect...of the formation, constituting amounts. Zircon, epidote, and an unidentified about 50 per cent of the total... 258 REGINALD SHAGAMâCENTRAL ARAGUA, VENEZUELA Epidote- chlorite- quartz -albite schists and ' i quartz-olbite |  | | Journal (article/letter/editorial) | | category, although the grade of metamorphism (epidote blueschist) was the same as that of the highest...2006a; Page et al. 2007). The lowest grade (mostly epidote blueschist) of the high-grade rocks was accreted...relatively lower temperatures of 300â350⊠C for epidote blueschists (Blake et al. 1988) at 120 Ma (Wakabayashi...these rocks have been considered an ophiolite (Ehrenberg 1975; Sharp 1988; Edelman and Sharp 1989; Edelman...the external schist of Ehrenberg (1975). Williams and Smyth (1973) and Ehrenberg (1975) suggested that |  | Lottermoser, Werner, Weber, Sven-Ulf, Grodzicki, Michael, Kirfel, Armin, Amthauer, Georg (2012) A semi-quantitative approach to derive the electric field gradient, applied to synthetic fayalite, α-Fe2SiO4: a reappraisal. European Journal of Mineralogy, 24 (5) 791-797 doi:10.1127/0935-1221/2012/0024-2199 | Journal (article/letter/editorial) | | Technology, Hans-Sommer-Strasse 10, 38106 Braunschweig, Germany 3 Steinmann Institute of Geology, Mineralogy and...University of Bonn, Poppelsdorfer Schloss, 53115 Bonn, Germany Abstract: Experimental and calculated structure...Buerger precession camera (Huber Ltd., Rimsting, Germany), cut with a diamond saw, polished to a thin slice...patterns with two transition temperatures; e.g. Ehrenberg & Fuess, 1993; Lottermoser et al., 1996). A structure...Kristallkunde. de Gruyter ed., Berlin, 386 p. Ehrenberg, H., Fuess, H. (1993): Analytical interpretation |  | | Journal (article/letter/editorial) | | Nordenski61dine Nor CaSnBâąOB Br6gger, 1887 Ouvrard, 1906 Ehrenberg and Ramdohr, 1934 Aleonard and Vicar, 1966 5...CaSnSiOs--âą CaSnOa + Xovofrolovaskarn deposit,Turinsk district, central CaSiOa + CO2). High-temperature,low-silica...SungelWay, Selangor,W. Malaysia Vesuvianite,garnet, epidote, zoisite, calcite, chlorite, quartz, Hosking and...mine, Rawang, W. Malaysia Vesuvianite, diopside,epidote, titanite, alkali feldspar, chlorite, fluorite...and associatedminerals from the Batang Padang district, Perak, Malaya, Malaysia: Mineralog. âąfag., v |  | | Journal (article/letter/editorial) | | a lesser extent, pyrite, dolomite, albite, and epidote (Carrillo-RosuÌa et al., 2003a). Hydrothermal alteration...White mica and chlorite (Ppyrite, albite, and epidote) are the minerals which characterize the proximal...could be defined as propylitic, with chlorite, epidote, and calcite/dolomite. (2) Dissemination in the...become dickite at 21 temperatures of 130ÂșC (e.g. Ehrenberg et al., 1993; LaÌzaro et al., 2003). This apparent...partially altered to chlorite. The presence of epidote and calcite (rather than dolomite, which appears |  | | Journal (article/letter/editorial) | | enclosingrocks Cambrian to Middle Ordovician NW Germany (Rheinisches Schiefergebirge-Oberharz) Middle...and tuffs has, like the whole of the Rio Tinto district,beensubjectedto intensedeformation and in many...associatedvolThe Devonian Ores of Northwestern Germany caniclasticrocks. The presenceof many of these...aggregateappears to have moved from a ores of northwest Germany are located near the strictlyvolcanicenvironmentinto...distancemoved may Meggen in the Schiefergebirge(Ehrenberg et al., not havebeengreat. Complexvariabilityand |
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Ehrenberg, Ilmenau-Grenzhammer, Ilmenau, Ilm District, Thuringia, Germany