Geochemistry of white micas from Portuguese tin and tungsten deposits

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doi: 10.1016/0009-2541(87)90168-9
Authors:Neiva, A. M. R.
Author Affiliations:Primary:
Univ. Coimbra, Dep. Mineral. and Geol., Coimbra, Portugal
Volume Title:Chemical Geology
Source:Chemical Geology, 63(3-4), p.299-317. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0009-2541
Publication Date:1987
Note:In English. 19 refs.; illus. incl. 11 tables, sketch map
Summary:Several correlations were found between major elements of these muscovites and muscovites in hypothermal quartz veins of Sn and W deposits in the area. It is suggested that the content of F and Cs may be guides to Sn and W mineralization. W is generally less abundant than Sn in muscovite and was probably transported by water. The muscovite of quartz veins from different deposits can be distinguished by major- and trace-element contents. It is abundant in schists bordering quartz veins and this type has more distinct major- and trace-element contents than the white mica of regional metamorphism and of hydrothermal muscovite along the vein-schist contact. It also crystallized at different log (fH2O/fHF). [R.E.S.]
Subjects:Economic geology; Geochemistry; Granites; Hydrothermal alteration; Igneous rocks; Major elements; Metal ores; Metamorphic rocks; Metasomatism; Mica group; Minerals; Muscovite; Plutonic rocks; Quartz veins; Schists; Sheet silicates; Silicates; Tin ores; Trace elements; Tungsten ores; Veins; Europe; Iberian Peninsula; Panasqueira Portugal; Portugal; Southern Europe; Argozelo; Borralha; Hydrothermal processes; Montezinho; Northern Portugal
Abstract Numbers:88M/5555
Record ID:1987082946
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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