Chemical composition and physical properties of lithium-iron micas from the Krušné hory Mts. (Erzgebirge)

Rieder, Milan; Huka, Miroslav; Kučerová, Dagmar; Minařík, Luděk; Obermajer, Jiří; Povondra, P.

doi:10.1007/bf00371980

Cited by 49 publications

(71 citation statements)

References 8 publications

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“…The composition and physical properties of Li-Fe micas from the Krušné hory/Erzgebirge have been examined in detail by Rieder et al (1970), who found trioctahedral micas from the CS-1 drill core to have 3.18-3.80 wt. % Li 2 O (at 609.0-609.8 m and 262.0-264.4 m, respectively) and 1.25 wt.…”

Section: Trioctahedral Micasmentioning

confidence: 99%

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Drill hole CS-1 penetrating the Cínovec/Zinnwald granite cupola (Czech Republic): an A-type granite with important hydrothermal mineralization

Stemprok¹

2016

J. Geosci.

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The Sn-W deposit at Cínovec and Zinnwald (Eastern Krušné hory/Erzgebirge) is associated with a granite cupola of Late Variscan age intruded into the Teplice rhyolite. The 1596 m deep CS-1 drilling was completed in [1961][1962][1963] at Cínovec in the center of the granite cupola. This paper reviews earlier and new petrological and geochemical data revealed by the CS-1 drill core. The drill-log showed that the upper granite zone of the cupola consists of lepidolite-albite granite grading continuously into zinnwaldite granite in fine-grained and medium-grained variants. Below 730 m depth, medium-grained, porphyritic lithian annite granite enclosing small bodies of porphyritic lithian annite microgranite was observed. Chemical analyses of the drill core are discussed in terms of increasing depth, significant textural variations and trace-element concentrations for As, Ba, Be, Bi, Mo, Nb, Rb, Sn, Th, U, Y, W, and Zr. The zinnwaldite/lithian annite transition in the granite profile is well demonstrated by the abrupt changes in Li, Fe and Ti concentrations with depth. High concentrations of Sn, W, and Bi are mainly confined to the greisen zones, associated with both sub-horizontal and steep fissure systems. As a consequence of subsolidus albitization, the pink coloration of lithian annite granite was changed to white-grey in the upper cupola zone above c. 730 m depth. The textural changes are interpreted as modifications of earlier microgranites by the later emplacement of medium-grained granites along sharp contacts. The major effect of subsolidus hydrothermal alteration is manifested by pervasive development of lepidolite and zinnwaldite at the expense of earlier lithian annite and by an intense albitization (Ab ~98 mol. %) reaching a depth of c. 730 m below the surface. The hydrothermal overprinting in the CS-1 drill core is interpreted to be caused by fluids derived from a deep lower crustal source, probably near the boundary with the mantle, as witnessed by the coexistence of lamprophyres and albite-rich granites in several ore districts of the Krušné hory/Erzgebirge with Li, Sn, and W mineralization. lower crust to form granitic magmatism and providing the addition of rare metals derived from the mantle (Štemprok and Seifert 2011).According to the fractional crystallization hypothesis, compatible elements are progressively removed from a melt. Consequently smaller volumes of differentiated melt become enriched in incompatible components and volatiles, including water, which eventually exsolve. The dyke equivalents of albite-rich granitic rocks known locally as "ongonite" in Mongolia (Kovalenko et al. 1970), appeared at that time to support this hypothesis.Fractional crystallization hypothesis differs from the metasomatic model of the origin of rare-metal granites developed by Jacobson et al. (1958) in anorogenic granites of Northern Nigeria and by Beus et al. (1962) in post-collisional settings on the territory of the former USSR. This mechanism accounts for the metasomatic overprinting of the endocontacts of mi...

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Section: Trioctahedral Micasmentioning

confidence: 99%

“…Relict cores of more annitic and sideophyllitic micas can be overgrown by, or replaced by, zinnwaldite. The complex composition of Li-Fe micas plotted in the diagram devised by Rieder et al (1970) shows transition from annite through zinnwaldite to "trilithionite".…”

Section: Postmagmatic Processesmentioning

confidence: 99%

Drill hole CS-1 penetrating the Cínovec/Zinnwald granite cupola (Czech Republic): an A-type granite with important hydrothermal mineralization

Stemprok¹

2016

J. Geosci.

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“…We may distinguish five magmatic evolutionary pathways ( Fig. 25): (I) Phlogopite sensu stricto-Ti-rich phlogopiteTi-Fe-rich phlogopite-Fe-rich phlogopite-Mg-Tirich annite-annite sensu stricto-Li-rich annite (corresponding with a branch of the complete trioctahedral system phlogopite/biotite/siderophyllite-lepidomelane according to Foster, 1960a, representing the Al-deficient path developed during the evolution of mantle-derived magmatic rocks); (II) Al-rich phlogopite-Al-Fe-rich phlogopiteAl-Mg-rich annite-Al-rich annite-Al-Li-rich annite (branch of the complete trioctahedral system phlogopite/biotite/siderophyllite-lepidomelane according to Foster, 1960a; Al-enriched path developed during the evolution of mantlederived magmatic rocks); (III) Al-Mg-rich annite-Mg-rich siderophyllitesiderophyllite sensu stricto-Li-rich siderophyllite-Fe-rich polylithionite-polylithionite sensu stricto (ferrous lithium-mica series according to Foster, 1960b, lithium-iron micas according to Rieder et al, 1970; path developed during the formation of crust-derived magmatic rocks, including their pegmatitic and aplitic derivates); (IV) Fe-rich polylithionite-Li-Fe-rich muscovite-Fe-rich muscovite (ferrous aluminiumlithium mica series according to Monier and Robert, 1986, zinnwaldite-muscovite subsolidus 'autometasomatic' trend of Henderson et al, 1989; path developed during late-magmatic evolution of granites); and (V) Polylithionite-Li-rich muscovite-muscovite sensu stricto (aluminium-lithium micas according to Foster, 1960b; path developed during evolution of pegmatites).…”

Section: Anionsmentioning

confidence: 99%

True and brittle micas: composition and solid-solution series

Tischendorf¹,

Förster²,

Gottesmann³

et al. 2007

Mineral. mag.

151

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Micas incorporate a wide variety of elements in their crystal structures. Elements occurring in significant concentrations in micas include: Si, IVAl, IVFe3+, B and Be in the tetrahedral sheet; Ti, VIAl, VIFe3+, Mn3+, Cr, V, Fe2+, Mn2+, Mg and Li in the octahedral sheet; K, Na, Rb, Cs, NH4, Ca and Ba in the interlayer; and O, OH, F, Cl and S as anions. Extensive substitutions within these groups of elements form compositionally varied micas as members of different solid-solution series. The most common true K micas (94% of almost 6750 mica analyses) belong to three dominant solid-solution series (phlogopite–annite, siderophyllite–polylithionite and muscovite–celadonite). Theirclassification parameters include: Mg/(Mg+Fetot) [=Mg#] formicas with VIR >2.5 a.p.f.u. and VIAl <0.5 a.p.f.u.; Fetot/(Fetot+Li) [=Fe#] formicas with VIR >2.5 a.p.f.u. and VIAl >0.5 a.p.f.u.; and VIAl/(VIAl+Fetot+Mg) [=Al#] formicas with VIR <2.5 a.p.f.u. The common true K micas plot predominantly within and between these series and have Mg6Li <0.3 a.p.f.u. Tainiolite is a mica with Mg6Li >0.7 a.p.f.u., or, fortr ansitional stages, 0.3–0.7 a.p.f.u. Some true K mica end-members, especially phlogopite, annite and muscovite, form binary solid solutions with non-K true micas and with brittle micas (6% of the micas studied). Graphical presentation of true K micas using the coordinates Mg minus Li (= mgli) and VIFetot+Mn+Ti minus VIAl (= feal) depends on theirclassification according to VIR and VIAl, complemented with the 50/50 rule.

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“…Li-rich micas crystallize in bodies similar to greisens at temperatures >400~ (KiJkne et aL, 1972;Rieder et aL, 1970;Charoy, 1979). The XRD patterns of the trilithionites analyzed from the Montebras cupola indicate that this lithian phase approximates a phlogopite 35%-trilithionite 65% solid solution (Robert and Volfinger, 1979;Monier, 1985).…”

Section: Hydrothermal Alteration Related To Greisen Formationmentioning

confidence: 99%

Hydrothermal and Supergene Alterations in the Granitic Cupola of Montebras, Creuse, France

Dudoignon

Beaufort

Meunier

1988

Clays and clay miner.

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Abstract--A mineralogical investigation of the highly kaolinized Chanon granite and albite-muscovite granite of the Montebras cupola, Creuse, France, indicates that the magmatic stage was followed by two hydrothermal events related to successive cooling stages and by late weathering. The hydrothermal alteration was accompanied first by greisen formation and then a broad kaolinization process, which pervasively affected the granitic bodies. In the Chanon granite, the greisens are characterized by a trilithionite-lepidolite-quartz-tourmaline assemblage and are surrounded by concentric alteration zones. From the greisen to the fresh granite three zones were distinguished: (1) a zone characterized by secondary brown biotite (<400~ (2) a zone characterized by secondary green biotite and phengite (300-350~ and (3) a zone characterized by the presence of corrensite (180"-200~ located around greisen veinlets. In the albite-muscovite granite the greisen is composed of lepidolite and quartz. This mineral assemblage was followed locally by Li-tosudite crystallization. During the second hydrothermal event (< 100~ an assemblage of kaolinite, mixed-layer illite/smectite (I/S), and illite formed pervasively and in crack fillings; the smectite layers of the US are potassic. Weathering produced Fe oxide and kaolinite. This kind of alteration developed mainly in the overlying Chanon granite. Here, Ca-Mg-montmorillonite formed in subvertical cracks, which transect the two granitic bodies, and hydrothermal I/S was obliterated by CaMg-montmorillonite.The hydrothermal parageneses were apparently controlled by magmatic albitization and the bulk chemistry of the two granitic bodies. The albitization, the formation of large micaceous greisens, and the successive recrystallizations of biotite (which was the most susceptible phase to alteration) provide information on the temperature range and chemical mobility during successive cooling stages. Si and Mg activities increased as the temperature of alteration decreased, and secondary Mg-biotite and Mg-phengite crystallized as long as the K activity was sufficient. The crystallizations of secondary biotite and phengite were followed by the crystallization of I/S during stages of low K activity. Secondary hydrothermal phases in the Chanon granite contain substantial Fe and Mg. Secondary hydrothermal phases in the albitemuscovite granite contain only small amounts of Fe and Mg, suggesting a lack of chemical exchange between the enclosing Chanon granite and the albite-muscovite granite, which is depleted in Fe-Mg-rich primary phases, such as biotite.

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Chemical composition and physical properties of lithium-iron micas from the Krušné hory Mts. (Erzgebirge)

Cited by 49 publications

References 8 publications

Drill hole CS-1 penetrating the Cínovec/Zinnwald granite cupola (Czech Republic): an A-type granite with important hydrothermal mineralization

Drill hole CS-1 penetrating the Cínovec/Zinnwald granite cupola (Czech Republic): an A-type granite with important hydrothermal mineralization

True and brittle micas: composition and solid-solution series

Hydrothermal and Supergene Alterations in the Granitic Cupola of Montebras, Creuse, France

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