 | | Report (issue) | | Trondheim - NTH Norway S. Olerud Geological Survey of Norway Box 3006 N-7001 Trondheim Norway M. Martinsen...N-7034 Trondheim - NTH Norway F. D. Pedersen Norsk Hydro Box 200 N-1321 Stabekk Norway F. S. Nordrum The...The Norwegian Mining Museum N-3600 Kongsberg Norway H. K. Schonwandt Geological Institute University of...Bergslagen. The most famous mining districts in Norway are Kongsberg, where silver was produced 1623-1957...Finnish deposits discovered during this century. In Norway, numerous deposits of pyrite and base metals were |  | | Journal (article/letter/editorial) | | PossiblePorphyryMolybdenum Occurrencewithin the OsloBiff, Norway ASKERGEYTI AND HANS KRISTIAN SCHâ˘NWANDT Abstract...activity is a classicpetrographicprovince. Ramberg Hydro a.s (Schâ˘nwandt and Geyti, 1977; Geyti, and Larsen...the BORDVIKA--A PORPHYRž-MO OCCURRENCE IN NORWAY 1213 mentsand phenocrysts.The fragmentsshowa...petrographiccriteria have been used: In sericitic altered rocks, sericite has almost com- rite; (2) quartz+ pyrite + molybdenite;(3)...sphalerite,galena, and pyrite. Assay of one veins of sericite can occur. vein gave 2.5 percentZn, 0.2 percent |  | | Journal (article/letter/editorial) | | 489. ALLEN (J. A.), anal. by, 638. Almandine, Norway, anal., 693. Alum Bay, Isle of Wight, jarosite...South Australia, opal, 357. Andradite, chromian hydro-, Tasmania, anal., opt., cell-size, 942. Angouria...compared with coexisting pyroxenes, 682; Norway, anal., 693; Norway, exsolution of quartz from, 815. Bit...Australia, alkali feldspar, anal., d2oi, 489. Bosahan quarry, Falmouth, Cornwall, biotite, 2IO. BOWDEN (P.)...Cell-contents of arthurite, 52o. - - - - Dean quarry, Coverack, The Lizard, Cornwall, analcime, natrolite |  | | Report (issue) | | containing dark smoky-gray quartz in a sparse sericite or black slaty matrix; in much of these rocks...rocks the feldspar 5- clasts have been altered to sericite; locally contains thin slaty beds. 1011 12 13...differing amounts of the minerals quartz, muscovite-sericite, chlorite, biotite, hornblende, carbonate, montmorillonite...chlorite, and epidote. Effects of deformation and hydro- thermal activity include a maze of closely-spaced...determined 10- 11 p fossil plant locality 12 stone quarry; most are long abandoned 13 16. coal mine, long |  | | Journal (article/letter/editorial) | | and the characteristic mineralsare muscovite(sericite), epidote, chlorite,and a memberof the carbonategroup...and muscovite (sericite); and for the potassium silicate facies, muscovite (sericite), biotite, and K-feldspar... 4. ALTERED ROCKS 353 Quartz-ortho- Quartz-sericite- clasealteration pyritealteration Bagdad, Arizona...alteration, whose characteristic mineralsare muscovite(sericite), epidote,chlorite, and a member of the carbonategroup...subordinateamountsof calcite,granular ruffle, leucoxene,sericite,and iron oxide. The plagioclase phenocrystsbe |  | | Journal (article/letter/editorial) | | intrusions have shown that quartzâjarositeâsericite, quartzâpyriteâsericite, and quartzâadulariaâchlorite alterations...gabbroic rocks; (8) Paleogene basaltic dikes; (9â11) hydro thermal alteration zones: (9) potassic, (10) propylitic...by abun dant druselike quartz. Quartzâjarositeâsericite alteration develops in the southeastern marginal...location of spherulitic rhyodacite sampling. sericite mass with cavities left after leaching of Kfeld...minosilicates (Fig. 4a, inset). Polymineralic jarositeâsericiteâcrandallite aggre gate is predominant among newly |  | | Journal (article/letter/editorial) | | stagesof deposition the solutionsremovedcalclte,sericite,and chlorite from interstitial and included fragments...Eng., Tech. Pub. â˘3, pp. â˘2-â˘4, â˘929. 156 HYDRO THERMAL LEA CHING. 157 where leachingtook placeat...betweenthe United StatesGeological Surveyand the HYDRO THERM.4L LE.4 CHING. x59 New Mexico Bureau of...G. LASKY. 5 Ist Tourmaline __ Calcite --a Sericite / T 2nd A G Leaching ⢠3rd I E 4th 5th...Average compositionof the ore shoots: Quartz, 68%; sericite and chlorite, 8%; calcite, 5%; tourmaline and |  | | Journal (article/letter/editorial) | | Fennoscandian Ore Deposit Database Name:Nordli. Country, ID Norway, NOl79 Alternative name Updated 26.3.2006. Latitude...metamorphic grade. Unmetamorphosed Alteration. Sericite Genetic type Porphyry (Cu, Au,Mo, W, Sn, Ag)....Comments: The Nordli deposit was discovered by Norsk Hydro a.s. in 1978 and became the site of extensive exploration...consisting of molybdenite and quartz, pyrite, sericite, biotite and/or K-feldspar. The release of volatiles |  | | Journal (volume) | | of gold deposits (e.g., the Bidjovagge mine in Norway a nd the Saattopora mine and several occurrences...from Lake Onega, Ru ss ia , to Finnmark, northern Norway (Fig. I) (E lo et al. 1989 , Manninen 1991 , Leh...altered si ltslOne ; quartz elasts in biotite-sericite matri x. Bi ot itc-seri cite zone, Myllyvaara...fractures. Very fine-grained rutile clusters occur in sericite. Palovaara. Crossed polarizers. Geologica l...Quartzite : quartz + albite Âą sericite Siltstone: quartz + albite + biotite Âą sericite Tuffite: quartz + albite |  | | Journal (article/letter/editorial) | | 67, , treatment 800â˘Ĺ˝ (montmorillonite .33, hydro Prefecture two defining A)=0 the to having...covered by a tuff breccia. The tuff breccia is hydro thermally altered and an interstratified min- *...specimen from Kagowara; b, specimen synthesized from sericite by treatment with sodium tetraphenylboron (after...and Dozono, 1972); c, specimen synthesized from sericite by treatment with acid (after Tomita and Sudo...MacEwan random is taken an is those of 2M1 sericite traphenylboron by 1968b) at 148â˘Ĺ˝ adsorbed |  | | Journal (article/letter/editorial) | | the â˘ein which involvesmeteoric waters. Quartz-sericite oxygenisotopedistributions in the vein and wall...Paleozoic or Precambrian rocks 78030 ' State Line Quarry Compton *TUNGSTEN QUEEN : "".'⢠'":' Phyllitic...comagmatic(Glover and Sinha, 1973), sericiteor sericite-richwall rock parallel and submetavolcanicsequence... and a less-pronounced aeromag- of epidoteand sericite. Quartz displayswavy exneticlineament,coincides...be dis- within the vein and adjacent wall rock. Sericite tinguishedfrom those producedduring metamor- typically |  | | Journal (article/letter/editorial) | | etc. Clay minerals were identified as illite-sericite which prevails over kaolinite, and with chlorites...classifier and the mechanical hydro-cyclones. The larger classes from hydro-cyclone go to the thickener...separation. The smaller classes (<25 Âľm) overflow from hydro-cyclone to the tailing in the form of sludge. On...with different initial content of iron derived by hydro-cyclone overflow generated during the processing...0â0.5 mm) goes to the hydro-cyclone. The larger classes, namely âsandâ from hydro-cyclone (classes 0.025â0 |  | | Journal (article/letter/editorial) | | HydrothermalK-feldspar, Fe-Ti oxides, chlorite, sericite, and epidote show limited compositionalvariations...Granodiorite(Fig. 2), within which chlorite-sericiteand sericite-clayassemblages occur. The spatialcoincidence...Granodiorite. They include chloritesericiteand sericite-clayassemblages.The chloritesericitealterationis...contactmetamorphiczone in the Panguna Andesite chlorite-sericite alteration conceivably developed (500-600 m of...alteration (K-silicate? phyllic ?) to albite and sericite. Biotite Granodiorite â˘-â˘30% of intrusion as |  | | Journal (article/letter/editorial) | | continues. The most characteristic minerals include sericite,quartz, chlorite, sulfides,epidote,zoisite, clinozoisite...productconsistingin somedistricts,for example, of quartz and sericite. A conspicuous feature of the alteration of the...large quantitiesof solutionsnecessaryto form HYDRO THtâ˘RM,4L ,4LTIâ˘R.4TI ON 163 large ore bodiesis...quartz-alunite;quartz-kaolinite; and quartz, kaolinitc, sericite. Teâ˘cture.--In igneousrockshydrothermalaltera...Replacement of feldsparphenocrysts by clayminerals,sericite,alunite,etc., resultsin an extremechangein grain |  | | Journal (article/letter/editorial) | | ationof high-temperature minerals to chlorite,sericite,calcite,andclaymineralsoccurredat muchlowertemperatures(_<270øC)...of hydrolyticassemblages, includingalbiteq-sericite,sericite,kaolinite-dickite, pyrophyllite, and alunite...alunite (all q- quartz Ăą pyrite). Albite q- sericite,sericite,and localkaolinite-dickitealterationprobablyformedfrom...TheseporphyThisstudywasundertaken to characterize hydro- riesintrudecoevalvolcanic rocks(KeetleyVoleanies)...(Figs. 2 and 3). These rockslocally q- pyrite _ sericite. Type i veinsare the mostabundantandgenerally |  | | Journal (article/letter/editorial) | | countryrockswith adularia, sericite,and quartz in fissurezones;albite, wairakite, sericite, and quartz outward... Numerâ˘col â˘to ⢠⢠New Zeoâ˘o⢠follâ˘ing o⢠nome, mdlcotes- M ...... dinlille depth ⢠(â˘tâ˘s) ...at the sulfur isotopes presentin the H2S of the hydro- bottomsof the holesand correspondmore closelyto...hydrothermal alteration. From the surfacedown to 504 m hydro- thermal alteration is characterizedby argillization...Sb, that theywerein equilibriumwith the 250ø C hydro- importance thermal fluids in the drillhole at the |  | | Journal (article/letter/editorial) | | K-feldsparandsericitebut on the micasideof the sericite-plagioclase boundary.Sulfide mineralizationand...sericitezone is replaced by fine-grained aggregates of sericite+ quartz----kaoliniteĂą montmorillonite;hydrothermal...alteration. The northern and southern boundaries of the sericite zone were, in part, structurallycontrolledby...0.4 to 0.7 for sericite zone underconditions nearthe stabilityboundarybetween sericite and K-feldspar...K-feldspar but on the mica side of the sericite-plagioclase boundary (cf. Hemley, 1959, Hemley et al., 1971) |  | | Journal (article/letter/editorial) | | (1989). The main zone depositis believedto be lo- sericite,biotite, carbonate(calcite),and amphibole (Fig...with varyingdegreesof phylliticalteration(quartz-sericite _ biotite schist),and locally,chlorite-amphibole...to 1,015 ft (verticaldepth 850 ft) or by quartz-sericite-biotiteschistat contactswith within the stockworksulfidehalo...thick bedded, fragmental quartz-feldspar-biotite-sericite schist;relict quartzand/ or feldsparphenocrysts-phenocryst...locallyfragmental,well-foliatedquartz-sericiteschistto quartz-sericite-biotite schistto quartzfeldspar-biotiteschist;locally |  | | Journal (article/letter/editorial) | | theisotopic dataforhydrous alteration minerals (biotite, sericite, 'pyro- phyllite,clays) and the calculated8â˘sO...Hornblende Clancy, Kain Quarry, cla (46ø21.9'N, 112ø0.2'W). BB 28 Clancy, Kain Quarry, cla (46ø21.9'N, 112ø0...essentially"fresh" althoughtrace alterationof plagioclaseto sericite,faint cloudingof someK-feldspars, and minor development...(2) +9.4 +6.7 Biotite +3.1 Quartz Dickitc Sericite +8.3 -166 4- 2 (2) Main Stage: Central Zone...zone. Tramway-Rarus, 3,500 level, 3511 cross-cut,sericite in rug with pyrite, apatite; Minnie Healy horsetail |  | | Catalog/List | | PbSiO/3 County. Arizona. U.S.A 2x2 1x2 sop Kragero Norway Rich orange-red masses with darker 6 ALBITE ÂŁL... _ . Pure black mica plate new Analysis , Saga Quarry. Tvedalcn near Ix I ÂŁ3 I x2 ÂŁ6 2x2 ÂŁ 12 7 AN!lilTE...paper available. ___ _ _ _ -- - - ¡- ¡- Larvik, Norway ¡-¡ ¡- . __ .. . ----¡ - ¡- - ¡¡- ¡-- -- ¡ ¡ Rich...pun: pale brown cleavages. Ula, near Larvik, South Norway Ix I ins .50 I x2 168 ANORTHOCLASE .ÂŁ1.JQ .. ....Rich distribution of tiny brown grains in Drag Norway Ix½ ÂŁ3 CeLaCO/3 _____ _J.TTROFLUORITEalsoblackTourmalinc |  | | Journal (article/letter/editorial) | | 14-32 Sericite . Allophane Haematite Quartz . 58-49 leaving '13 of water unaccounted for. Sericite is assumed...to increase the amount of alumina available for hydro-aluminous silicates. It m a y be regarded as certain...pigment. The possi bility of the occurrence of a hydro-ferric silicate (cf. nontronite) may also be borne...that the clay consistent is mainly composed of sericite or some allied mineral in which the alkalies are...behaves in the same way, and the view that it is sericite or some closely allied mineral is strengthened |  | | Journal (article/letter/editorial) | | resulting in a conversion of much kaolinite into hydro-micas. (.3) Plastic fire clays have resulted from...high percentage of hydro-mica. (4) The change from muscovite through hydrated or hydro-micas to kaolinite...granodiorites. The rock from Sogneskollen, in western Norway, is post-Silurianin age. It consists of about 70...and some epidote, garnet, titanite, pyrite, and sericite. The granodioriteof the Island of Svano occurs...Utsire is a small island off the west coast of Norway. About fourfifths of the rock of which it is composed |  | | Journal (article/letter/editorial) | | FORMATION OF SOME THERMAL-ALTERATION BRONSON COMMON HYDRO- MINERALS. STRINGHAM. ABSTRACT. The problemsof...Actinolite Biotite PYLQPhyIlit e 450-- 400 Sericite Albite -- 350 Brucite Adularia Apaiite Epiiâ˘'te...Ip_yroâ˘yJILt. t Dickitc Hydro,biotite Kaolinitc Endellite Calcite & Other Carbonates â˘Sericite Talc? Allophone...Fairly Definite Field Established Chlorite Field: Sericite Field: is presented herewiththatideaâ˘n mind |  | | Journal (article/letter/editorial) | | full spectrumof hydrothermal onthisin theventwith sericite-carbodeposits. In many of the depositsonly part...representperiodsof reapatite-actinoliterocksforming sericite,chlorite,he- newed dilation on the fractures....conditions Late magmatic, Oxidizing, hydro- Oxidizing hydro- Reducing, hy- Reducing, hy- 6000C,...100øC. Channeled (in joints) escape of oxidizing hydro- thermal fluids '--)Hm-Uran-Qtz-CO⢠-2veins; 4...hydrous oxidizing alteration '--> Chl-HmCOâ˘-â˘-sericite-pyrite assemblages(stage lb); 400ø to â˘00øC. |  | | Report (chapter) | | parageneses from the Raipas formation of Northern Norway BY F. M. VOKES With 3 plates and 8 text-figures...Abstract. The Precambrian Raipas formation of Northern Norway contains copper deposits showing two distinct parageneses...reports in the archives of the Geological Survey of Norway concerning a deposit of copper sulphide minerals...colleagues on the staff of the Geological Survey of Norway was carried out in the Survey's laboratories at... S. Føyn, Director of the Geological Survey of Norway for permission to publish the paper. Raipas formation |
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