Problems of the origin, ore-bearing and evolution of rare-metal granitoids

Коваленко, В. И.; Kovalenko, N. I.

doi:10.1016/0031-9201(84)90033-5

Cited by 59 publications

(30 citation statements)

References 3 publications

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“…This microgranite is comparable with ongonites described from Mongolia (Kovalenko et al 1971) or to extrusive rhyolites described from the USA (Christiansen 1983).…”

Section: Granitoids Of the Slavkovský Lessupporting

confidence: 83%

The Krásno Sn-W ore district near Horní Slavkov: Mining history, geological and mineralogical characteristics

Beran¹,

Sejkora²

2012

J. Geosci.

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The tin-tungsten Krásno ore district near Horní Slavkov (Slavkovský les area, western Bohemia) belongs to the most important areas of ancient mining in the Czech Republic. The exceptionally rich and variable mineral associations, and the high number of mineral species, make this area one of the most remarkable mineralogical localities on a worldwide scale. The present paper reviews the data on geological setting of the ore district, individual ore deposits and mining history. Horní Slavkov and Krásno were known as a rich source of exquisite quality mineral specimens stored in numerous museum collections throughout Europe. The old museum specimens are often known under the German locality names of Schlaggenwald (= Horní Slavkov) and Schönfeld (=Krásno). The megascopic properties and paragenetic position of selected mineral classics are reviewed which include arsenopyrite, fluorapatite, fluorite, hübnerite, chalcopyrite, carpholite, cassiterite, quartz, molybdenite, rhodochrosite, sphalerite, topaz and scheelite.

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“…This microgranite is comparable with ongonites described from Mongolia (Kovalenko et al 1971) or to extrusive rhyolites described from the USA (Christiansen 1983).…”

Section: Granitoids Of the Slavkovský Lessupporting

confidence: 83%

The Krásno Sn-W ore district near Horní Slavkov: Mining history, geological and mineralogical characteristics

Beran¹,

Sejkora²

2012

J. Geosci.

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“…Other nomenclatures are used for topaz-albite granite in the literature, as topaz granite (Pichavant andManning 1984, Taylor andFallick 1997), Li-F rare metals granite (Kovalenko and Kovalenko 1984) or topaz -Li-mica granite (Pollard and Taylor 1991 n.a. = not analyzed granite type is considered special by its rare occurrence, unusual mineralogy and for being genetically related to mineral deposits of the type Sn-W and Ta-Sn.…”

Section: Discussionmentioning

confidence: 99%

The Topaz-Albite Granite and Related Rocks From the Sn-in Mineralized Zone of Mangabeira Granitic Massif (Go, Brasil)

Moura

Botelho

2000

RBG

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The Mangabeira Massif is part of the Goiás Tin Province and is constituted of an A-type Paleoproterozoic biotite granite, evolved granites and greisens. The Main Greisenized Zone of the massif (MGZ) is composed of the less evolved Li-siderophyllite g2d granite, the topaz-albite granite (TAG), Sn-mineralized greisens and a quartz-topaz rock, with anomalous indium contents (up to 0.4 wt%). Micas are important for the characterization of each facies and define a phengite-zinnwaldite series, so far only described in the Paranã Subprovince rocks. Late/post-magmatic processes affected the MGZ rocks, causing the mobility of many elements, except TiO 2 , Ta and Th . The topaz-albite granite (TAG) is similar to the rare topaz granites and has derived from g2d granite by magmatic differentiation. TAG is subsolvus, leucocratic, equigranular, medium-grained and contains essential quartz, albite, topaz, microcline and zinnwaldite. Topaz occurs either as inclusions (20mm) in albite or as large subhedral grains. The accessory minerals are monazite, cassiterite, zircon and magnetite. In the Qz-Ab-Or system, TAG samples plot near the minimum for 0 wt. %F. Chemically TAG is characterized by molar Na/K mainly >1, A/CNK ratio between 1.3 and 1.5, high contents of F, Li, Al 2 O 3 , Rb, Zn and Sn and low TiO 2 , MgO, P 2 O 5 , CaO, Zr, Ba and Sr. The granites REE pattern is flat with a pronounced Eu anomaly. The quartz-topaz rock occurs associated with the TAG and resembles topazites, interpreted as magmatic rocks in the literature, but it can also be the product of topaz-albite granite hydrothermal alteration. The rock also contains sphalerite, wolframite, löllingite, chalcopyrite, bismutinite, galena, stannite, tennantite, In minerals (yanomamite, roquesite and dzhalindite) and hydrated arsenates of Sn, U, Ba, K, Pb and Bi.

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“…Meanwhile, cassiterite belong to the second types of association is related to lithium -albite granites which are formed as ultimate differentiates from haplogranitic melt by simultaneous crystallization of minerals from melt and fluid under conditions of high a F, Li ; the activities of lithium and fluorine; (Pollard, 1983; Chemistry of cassiterite in rare metal granitoids and the associated rocks Kovalenko and Kovalenko, 1984;Schwartz, 1992).…”

Section: Introductionmentioning

confidence: 99%

Chemistry of cassiterite in rare metal granitoids and the associated rocks in the Eastern Desert, Egypt

Abdalla

Matsueda

Obeid

et al. 2008

Journal of Mineralogical and Petrological Sciences

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The study of chemical zoning, color and pleochroism of cassiterites aids in understanding of the metallogeny and exploration of the primary Sn source. These characteristics assist in discriminating the host granitoids into two associations: metasomatized granites and lithium albite granites. The cassiterite of the metasomatized alkali feldspar granites (i.e., apogranites) is characterized by enhanced to moderate Nb, Ta, (with high Nb/Ta ratios), Ti, FeO * and lower Ga 2 O 3 (<0.01 wt%). Also, it is characterized by the development of deep brown to dark brown pleochroic color zones which oscillate or progressively alternate with lighter color zones. On the other hand, the cassiterite in the lithium albite granite is enriched in Ta, Nb (with low Nb/Ta ratio), Ti, FeO * , and Ga 2 O 3 0.01 -0.04%. It is also characterized by deep -orange to reddish brown pleochroic core or bands which are alternate with lighter color bands. It is noteworthy that the conspicuous variation in the colors, pleochroism, and chemistry of cassiterite from metasomatized apogranites and lithium albite granites can be considered as a valuable exploration tool when prospecting for primary cassiterite mineralization. In other words, during the panning survey, which is largely applied to rare metal mineralizations in general and cassiterite deposits in particular (where cassiterite is essentially dispersed in the mechanical aureoles), the pleochroism of any cassiterite present indicates the nature of the primary mineralizations (i.e., magmatic or metasomatic).

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Problems of the origin, ore-bearing and evolution of rare-metal granitoids

Cited by 59 publications

References 3 publications

The Krásno Sn-W ore district near Horní Slavkov: Mining history, geological and mineralogical characteristics

The Krásno Sn-W ore district near Horní Slavkov: Mining history, geological and mineralogical characteristics

The Topaz-Albite Granite and Related Rocks From the Sn-in Mineralized Zone of Mangabeira Granitic Massif (Go, Brasil)

Chemistry of cassiterite in rare metal granitoids and the associated rocks in the Eastern Desert, Egypt

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