 | | Journal (article/letter/editorial) | | consist mostly of goethite, but also siderite and chamosite occur, and quartz grains are commonly the nucleus...iron oolite. The ooids consist of francolite and chamosite hosted in sandstone cemented by calcite and phosphate...clay can also be seen here. In another section, chamosite and limonite (mainly goethite) ooids occur together...impregnated by iron oxide. The ooids are composed of chamosite, but also phosphatic and hematitic ooids occur...types of ooids (Sturesson, 1986). Iron ooids of chamosite, goethite and hematite commonly occur together |  | | Journal (article/letter/editorial) | | Ordovician; Indonesia; Baltoscandia; Wales; Czech Republic 1. Introduction The origin and conditions...Mineralogy–Ordovician iron ooids are composed of hematite, chamosite, or iron oxyhydroxides. A precise mineralogical...whereas the Swedish ooids can be composed of either chamosite, hematite and limonite. The XRD analyses of the...different grain size (Heikoop et al., 1996). Chamosite ooids usually have a better-preserved lamination...increases westwards and is particularly high in the chamosite ooids in Sweden. For the purpose of comparison |  | | Journal (article/letter/editorial) | | com/locate/oregeorev Chamosite, siderite and the environmental conditions of their formation in chamosite-type Phanerozoic...characteristic ironstone minerals occurring in chamosite-type ironstone deposits were investigated. These...samples are from 31 localities and 8 countries (Czech Republic, France, Germany, United Kingdom, Egypt, Nigeria...pass successively from post-oxic (formation of chamosite and authigenic rice-grain shaped siderite) via...of abundant xenomorphic siderite that replaces chamosite). D 2005 Elsevier B.V. All rights reserved. Keywords: |  | | Journal (article/letter/editorial) | | version accepted June 30, 1999 Summary In the Nurra region, NW Sardinia, oolitic ironstones are interlayered...ooids consist of chamosite, siderite or magnetite or, rarely, stilpnomelane. Chamosite ooids consist of...late replacement by siderite. The alternation of chamosite and Fe-oxide observed in a few samples points...Fe-rich chemical component. The abundance of chamosite and siderite explains the high values of LOI and...constituees de chamosite, siderite ou magnetite ou rarement, stilpnomelane. Les oolithes de chamosite peuvent |  | | Journal (article/letter/editorial) | | ironstones from 38 localities in 8 countries (U.K., Czech Republic, Germany, France, Luxembourg, Egypt, Nigeria...analyses, two types of ironstones, namely, the chamosite and the kaolinite types, were identified. These...magnetite-bearing and the moderately ferruginized chamosite subtypes. The classification of the types and...Field I contains three chamosite subtypes. These subtypes consists of chamosite which occurs as groundmass...and in the form of ooids (pisoids, peloids). Chamosite consists of the end-members Fetot (ranging from |  | | Journal (article/letter/editorial) | | one of the rare examples of the rock containing chamosite of freshwater origin. An analogous chloritic mineral...known. Melka (1957a) separated comparatively pure chamosite of the kaolinite type from Bohemian Ordovician...Netolicky (1960) found alternating coatings of chamosite and illite in oolites, and illite was found to...Novak et al. (1956) have studied an orthorhombic chamosite from ore veins in Kutna Hora found in association...orthoantigorite, these authors have named the orthorhombic chamosite orthochamosite. The orthochamosite from Kutna |  | | Journal (article/letter/editorial) | | Ferriare-aux-Etangs SCOS Upper-Thuringian SCOS Sarka INT1 Klabava Cambrian-Silurian LateE•[lyOrdovician Mi(t(lle...minerals of SCOS- IF ironstoneare goethite,hematite,chamosite, and siderite. Locally, magnetiteor pyrite may...beds seldom exceed a few tens dark siderite-chamosite-pyrite-apatite-quartz ironin thickness and so...grades to a red hematite-goethite- of cent/meters chamosite-apatite-rich thick centralportion.Siderite, hematite...goethite,apatite,and chert all locally replace chamosite,which apparently was the firstformed ferriferousmineral |  | | Report (issue) | | and Paleontology Albertov 6 128 43 Prague 2 Czech Republic Gernold Zulauf Institut für Geowissenschaften...from the Barrandian area (Bohemian Massif, Czech Republic) . . . . . . . . . . . . . . . . . . . . ....Central Barrandian domain (Bohemian Massif, Czech Republic) . . . . . . . . . . . . . . . . 231 Christian...Structural evolution of the Prague synform (Czech Republic) during Silurian times: An AMS, rock magnetism...Bohemian Massif,” opening meeting of IGCP (Prague, Czech Republic, 16–25 September 2004); • Special symposium |  | | Book | | and N. M. BANAS, W. KRAMER, VII Moldanubian Region VII.A Introduction J. FIALA. . . . and K. VII...Contributors J. AICHLER Czech Geological Survey P.O. Box 65 79001 Jesenik Czech Republic H.-J. ANDERLE Geological...Charles University Albertov6 12843 Prague 2 Czech Republic I. CHLUPAc Department of Geology Faculty of...Charles University Albertov 6 12843 Prague 2 Czech Republic R.D. DALLMEYER Department of Geology University...DUDEK J. CHAB Czech Geological Survey Malostranske mlm. 19 11821 Prague 1 Czech Republic Department of |  | | Book | | Council, the Scottish Tourist Board, South Lakeland District Council, University of Lancaster; and Messrs....Wales itself, and certainly at least its Bala district, lay within the territory of the Ordovices, who...delineated by brachiopodtrilobite assemblages and each region requires a pelagic and at least one benthic standard...assemblages de brachiopodes-trilobites et cbaque region demande une section pelagique ou du moins un standard...of the earth's crust that once formed a single region supporting a homogeneous fauna. However, all provinces |
|
