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Conversion of calcite to fluorite

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Journal Article
Published: 01 January 1956
Micropaleontology (1956) 2 (1): 71-78.
Journal Article
Published: 01 September 2004
South African Journal of Geology (2004) 107 (3): 413-430.
... by chloritisation of biotite such as in the Steelpoort Park granite veins. For the primary fluorite, most samples fall on an array indicating an age of ~2.05 Ga. but with a large scatter. A different and later hydrothermal fluid produced a totally different generation of fluorite and calcite in open vugs...
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Journal Article
Published: 01 February 2008
The Canadian Mineralogist (2008) 46 (1): 87-109.
... dependent on the composition of the protolith. In the calcitic marble, the early prograde assemblage locally consists of a cryptic zone of wollastonite followed by banded to massive grossular (Grs 73–76 Adr 18–22 Sps 5–6 ), locally abundant fluorite and minor vesuvianite. The pyroxene skarn, composed of Mn...
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Journal Article
Published: 01 August 2008
Mineralogical Magazine (2008) 72 (4): 909-924.
... (e.g. forbidden transitions of Mn 2+ ) are calcite, fluorite, or apatite. This effect can be (at least partly) reduced by variations of the magnification of the sample area viewed or by selection of a very low scan velocity. No phosphorescence is visible in OM-CL images because of the use...
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Journal Article
Journal: Economic Geology
Published: 01 September 2000
Economic Geology (2000) 95 (6): 1277-1296.
... barren dolostones. The third, a white coarse-grained dolomite (III) is directly associated with the talc. The final episode is characterized by late-stage vuggy dolomite (IV), calcite, and quartz. Fluid inclusion studies in dolomite and quartz suggest that the dolomitizing fluids were aqueous NaCl-CaCl 2...
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Series: Geological Society, London, Special Publications
Published: 01 January 2011
DOI: 10.1144/SP359.12
EISBN: 9781862396074
... in several outcrops. Fault veins are dominantly calcite, with minor quartz and rare fluorite. Extension veins are common around bedding-discordant faults. Nearly all fault veins are hosted by reverse faults that, with respect to the inferred stress field at the time of faulting, range from optimally oriented...
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Journal Article
Journal: Economic Geology
Published: 01 May 2000
Economic Geology (2000) 95 (3): 587-606.
... inclusion microthermometry on barite, quartz, and calcite were used to reveal the nature and source of the ore-forming fluids and constrain the age of mineralization. The δ 34 S values of barite between 8.9 and 14.7 per mil are intermediate between the sulfur isotope signatures of Triassic evaporites...
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Journal Article
Published: 01 February 2002
Geochemistry: Exploration, Environment, Analysis (2002) 2 (1): 83-96.
... characterized by elevated U levels. In the Rössing pit, in the SJ area, U is hosted by uraninite and secondary U minerals including beta-uranophane. Conversely, in the SH area, U is hosted principally by the pyrochlore-group mineral, betafite. Manometric determination of the proportions of H 2 O, CO 2 and non...
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Series: Reviews in Economic Geology
Published: 01 January 2018
DOI: 10.5382/rev.20.07
EISBN: 9781629491189
... ). Calcite, realgar, orpiment, and rare fluorite all occur late in the paragenetic sequence as open-space minerals that postdate the deposition of Au-bearing arsenian pyrite ( Tucker et al., 2013 ). The shear- and breccia-hosted character of the auriferous zones reflects strong structural and permeability...
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Journal Article
Journal: Economic Geology
Published: 01 June 2013
Economic Geology (2013) 108 (4): 641-666.
... recrystallized limestone, and limestone blocks within the alkaline volcanic country rocks. Most magnetite is hosted by exoskarn that is overprinted by a hydrous mineral assemblage consisting of epidote, calcite, and tremolite. The Karamadazi Fe skarn deposit, with a reserve of 6.4 Mt at 54% Fe ( Oygur, 1986...
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Journal Article
Journal: Economic Geology
Published: 01 August 2004
Economic Geology (2004) 99 (5): 965-985.
... pyrite and chalcopyrite associated with actinolite-hornblende, albite, clinopyroxene, calcite and quartz, usually located along major shear bands (Colmenar mine; 8 in Fig. 1 ); (2) massive magnetite- and vonsenite-rich replacements in tonalite and in calc-silicate and pelitic hornfels, which are also...
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Journal Article
Journal: GeoArabia
Publisher: Gulf Petrolink
Published: 01 July 2006
GeoArabia (2006) 11 (3): 121-158.
..., anhydrite nodules and calcite and fluorite cements) have widely varying 87 Sr/Sr 86 ratios (0.70780 to 0.71084) than expected for Late Permian seawater, which supports a non-marine burial origin, and indicating that they formed at different times from waters containing variable amounts of strontium-87...
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Journal Article
Journal: Economic Geology
Published: 01 May 2008
Economic Geology (2008) 103 (3): 539-554.
... with a quartz monzonite stock ( Baker and Lang, 2003 ). Quartz, calcite, and fluorite contain halite-bearing inclusions, and Baker and Lang (2003) distinguished between type 3A inclusions containing liquid, vapor, and halite, and type 3B inclusions containing liquid, vapor, halite, and sylvite. Both inclusion...
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Journal Article
Journal: Economic Geology
Published: 01 November 2014
Economic Geology (2014) 109 (7): 1901-1928.
... (4,050 and 109 ppm, respectively), compared to those of the other Treasure Lake Group metasedimentary units and felsic volcanic rocks of the Great Bear magmatic zone. Conversely, rhyodacites hosting the Sue-Dianne deposit have, on average, the lowest V (38 ppm), Ni (9 ppm), and Cr (24 ppm) concentrations...
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Series: GSA Memoirs
Published: 01 January 2006
DOI: 10.1130/2006.1198(11)
... or dominantly of galena and sphalerite with sparry dolomite, calcite, and local quartz and pyrite or marcasite. Some MVT deposits, which consist dominantly of fluorite, have been considered to form a distinct group in recent surveys and are not included in this summary ( Sangster, 1990 ; Leach and Sangster...
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Series: GSA Field Guide
Published: 01 January 2011
DOI: 10.1130/2011.0024(24)
EISBN: 9780813756240
... banding. The 80-m-thick (13-km-long) rhyolite is overlain by discontinuous, thin interflow sandstone. The contact between the overlying basalt with the rhyolite and sandstone is highly irregular and complex, and amygdule fillings of abundant calcite and rare purple fluorite are present. Walking up section...
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Journal Article
Journal: Economic Geology
Published: 01 August 2008
Economic Geology (2008) 103 (5): 939-956.
... for other types of hydrothermal ore deposits; see table 3 of Seedorff et al. (2005) Abbreviations: ab = albite, act = actinolite, anh = anhydrite, bio = biotite, bn = bornite, ca = calcite, chl = chlorite, cp = chalcopyrite, dig = digenite, diop = diopside, ep = epidote group minerals, fl = fluorite...
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Series: Geological Society, London, Special Publications
Published: 01 January 2013
DOI: 10.1144/SP376.22
EISBN: 9781862396449
... carbonates contain common clay minerals (illite, kaolinite and chlorite), halite, locally abundant magnesite, minor amounts of pyrite and celestite, occasional secondary gypsum, trace amounts of fluorite, monocrystalline and polycrystalline quartz, plagioclase and feldspar grains, single mica flakes, rare...
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