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U Mo And Ree Bearing Pegmatites Skarns And Veins In The Central Metasedimentary Belt Grenville Province Ontario
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Author :David R. Lentz Publisher :Sudbury, Ont. : Geological Association of Canada, Toronto '91 Organizing Committee ISBN 13 : Total Pages :80 pages Book Rating :4.F/5 ( download)
Book Synopsis U-, Mo-, and REE-bearing Pegmatites, Skarns and Veins in the Central Metasedimentary Belt, Grenville Province, Ontario by : David R. Lentz
Download or read book U-, Mo-, and REE-bearing Pegmatites, Skarns and Veins in the Central Metasedimentary Belt, Grenville Province, Ontario written by David R. Lentz and published by Sudbury, Ont. : Geological Association of Canada, Toronto '91 Organizing Committee. This book was released on 1991 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Petrogenesis of U-, Th-, Mo-, and Ree-bearing Pegmatites, Skarns, and Veins in the Central Metasedimentary Belt of the Grenville Province Ontario and Quebec by : David Richard Lentz
Download or read book Petrogenesis of U-, Th-, Mo-, and Ree-bearing Pegmatites, Skarns, and Veins in the Central Metasedimentary Belt of the Grenville Province Ontario and Quebec written by David Richard Lentz and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Fluorite-apatite-calcite veins, have inclusions and selvages of coarse-grained biotite, K-feldspar, Ca amphibole, Ca pyroxene, and titanite with occasional magnetite, sulphides, and rate-element minerals.
Book Synopsis Petrogenesis of Uranium-, Thorium-, Molybdenum-, and Rare Earth Element-bearing Pegmatites, Skarns, and Veins in the Central Metasedimentary Belt of the Grenville Province, Ontario and Quebec by : David Richard Lentz
Download or read book Petrogenesis of Uranium-, Thorium-, Molybdenum-, and Rare Earth Element-bearing Pegmatites, Skarns, and Veins in the Central Metasedimentary Belt of the Grenville Province, Ontario and Quebec written by David Richard Lentz and published by . This book was released on 1992 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Field examination of late-tectonic, U-, Th-, Mo-, and REE-bearing pegmatites, skarns, and veins in the southwestern Grenville Province indicates that they are spatially and temporally related. These observations lead to a renewal of the hypothesis that the deposits were related to intrusion of the pegmatites and formation of the skarns. The granitic pegmatites are related either to chemical fractionation of late-tectonic granitic plutons or mid-crustal anatectic melts with emplacement at the present structural level. This interpretation is based primarily on their discordant nature, late tectonic age, and moderately-evolved chemical composition. At the time of pegmatite emplacement the host rocks remained above 500$\sp\circ$C. Endoskarns (within pegmatite) are dominated by calc-silicate minerals (Ca pyroxene, scapolite, andradite, and titanite) and have a similar origin to the hybridized pegmatites involving metasomatic reaction of the pegmatite and skarn by either diffusion or infiltration of chemical components into the pegmatite. The exoskarns are dominantly primary with a mineralogical zonation which may be characterized as proximal to distal with relation to the pegmatite. The absence of calcite within the proximal skarn is explained in that the pegmatite-derived fluids were undersaturated in calcite resulting in dissolution. Calcite veins represent distal primary skarn. Secondary tremolite-phlogopite-sulphide replacement veins occur within the primary skarn. Fluorite-apatite-calcite veins, have inclusions and selvages of coarse-grained biotite, K-feldspar, Ca amphibole, Ca pyroxene, and titanite with occasional magnetite, sulphides, and rate-element minerals. Common minerals within the pegmatites, skarns, and veins facilitated a chemical comparison of these minerals. The colour of ferromagnesian phases, particularly Ca pyroxene and biotite/phlogopite was used in the field to describe the relative iron contents of these phases. In general, iron was highest in the minerals associated with the pegmatites, and proximal skarn; more magnesium rich in the skarns not directly associated with a pegmatite. Major- and trace-element distribution coefficients (K$\sb{\rm D})$ for coexisting phases in veins and skarns are indistinguishable, although only a few elements (Fe, Mg, Mn, and Zn) have regular distributions. In a more detailed study of the Hunt Mo skarn, four zones have been identified in the exoskarn which is, in part, consistent with observations from many other skarns in the region. The proximal zone 1 assemblage is narrow, coarse-grained (1 metre), and dominantly composed of Fe-rich Ca pyroxene, scapolite (or microcline or albite), titanite, pyrite, and molybdenite (rare quartz). The dominant skarn type, zone 2, is fine- to coarse-grained and consists of Fe-bearing Ca pyroxene, phlogopite/biotite, titanite, pyrite, and pyrrhotite, with irregular phlogopite (possibly secondary) veinlets throughout. Apatite is an accessory phase within zone 2 skarns. The third zone is composed of Ca pyroxene; phlogopite, and tremolite, and occasionally calcite and pyrite which are fine to medium grained. The fourth zone represents small veins hosted in graphite-bearing phlogopite-diopside-dolomite-calcite marble, and is dominated by fine- to medium-grained tremolite, phlogopite, calcite, pyrite $(\pm$ graphite). (Abstract shortened by UMI.).
Book Synopsis Rare Earth Element Mines, Deposits and Occurrences by : G. J. Orris
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Book Synopsis Canadian Journal of Earth Sciences by :
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Book Synopsis Fenite, Carbonatite and Other Alkalic Rocks in the Bancroft-Haliburton-Muskoka Regions by : S. B. Lumbers
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Book Synopsis Geology of Ontario by : Ontario. Ministry of Northern Development and Mines
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Book Synopsis Abstracts of Papers by : Geological Association of Canada. Meeting
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Author :Geological Association of Canada Publisher :St. John's, N.L. : Geological Association of Canada ISBN 13 : Total Pages :360 pages Book Rating :4.F/5 ( download)
Book Synopsis Rare-element Geochemistry and Mineral Deposits by : Geological Association of Canada
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Book Synopsis Geo-log (Geological Association of Canada) by :
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Book Synopsis Rocks and Minerals for the Collector by : Ann P. Sabina
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Book Synopsis Current Research, 1994 by : Geological Survey of Canada
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Book Synopsis CIM Bulletin by : Canadian Institute of Mining and Metallurgy
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