UNIVERZITA KOMENSKÉHO V BRATISLAVE VZÁCNOPRVKOVÁ ...

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35 hm.% WO3) a manganocolumbite (do 10 hm.% WO3). Ďalšou špecifickou črtou je pokles pomeru Mn/(Mn+Fe) s narastajúcou hodnotou pomeru Ta/(Ta+Nb) v okrajových častiach niektorých kryštálov manganocolumbitu. Tento jav súvisí pravdepodobne z kryštalizáciou apatitu, ktorý sa často vyskytuje na kontakte z manganocolumbitom, pričom kryštalizácia apatitu (z obsahom do 2 hm.% MnO) mohla znížiť obsah Mn v tavenine a zapríčiniť tak pokles pomeru Mn/(Mn+Fe) v okrajových častiach manganocolumbitu. Kľúčové slová: Berylovo-columbitový Pegmatit. Leukogranit. Nb-Ta Minerály. Chemické Zloženie. Frakcionácia Nb-Ta a Fe-Mn.
Abstract CHUDÍK, Peter: Rare-element Nb-Ta mineralization in granitic pegmatites and granites of the Western Carpathians. [Ph.D. thesis]. Comenius University, Bratislava. Faculty of Natural Sciences. Department of Mineral Deposits. Supervisor: doc. RNDr. Pavel Uher, CSc. FNS CU. 2010. 135 p. Nb-Ta phases, especially members of columbite group, tapiolite and wodginite, represent most characteristic accessory minerals of the LCT-family rare-element granitic pegmatites. Detailed study of their textural and compositional variations reveals a complex evolution of their parental rare-element granitic pegmatites and granites. The Jezuitské Lesy granitic pegmatite exhibits an example of moderately evolved dike of the beryl-columbite subtype, where several generations of the Nb-Ta minerals portrayed their magmatic to post-magmatic evolution. All members of columbite group minerals, ferrotapiolite, ferrowodginite and microlite were identified in the Jezuitské Lesy pegmatite. Moreover, the columbite-tantalite, ferrotapiolite and ferrowodginite form three generations with distinct chemical composition and evolution. The first generation of Nb-Ta minerals (ferrotantalite I, ferrotapiolite I and ferrowodginite I) originated during the crystallization of coarse-grained quartz-microcline-muscovite zone and it is characterized by the relatively high Ta/(Ta+Nb) ratio. The second generation of Nb-Ta minerals (ferrocolumbite to ferrotantalite II, ferrotapiolite II, ferrowodginite II) formed during the crystallization of finegrained saccharoidal albite zone and it is characterized by the decrease of Ta/(Ta+Nb) ratio. Low Ta/(Ta+Nb) values in columbite-tantalite II can be explained by crystallization from the Ta-depleted melt, which was significantly impoverished in Ta, after crystallization of Ta-rich phases (ferrotapiolite I, ferrowodginite I). The third generation of Nb-Ta minerals (manganotantalite III, manganocolumbite III, ferrotapiolite III and ferrowodginite III) most likely formed during the final magmatic stage of the pegmatite consolidation and it is characterized by increase of Mn/(Mn+Fe) ratio, as a consequence of fluid composition change, connected with increased activity of F. Microlite represent the youngest Nb-Ta phase which formed probably during a post-magmatic, hydrotermal overprint of the Jezuitské lesy granitic pegmatite by Ca, Na and F rich fluids. Accessory ferrocolumbite to ferrotantalite and ferrotapiolite were identified in pegmatitic leucogranite near Duchonka, Považský Inovec Mts.. The composition of columbite-tantalite shows a relatively constant Mn/(Mn+Fe) ratio (0,20-0,27; locally 0,35-0,40), but extreme range of Ta/(Ta+Nb) ratio (0,18-0,72). Ratios higher than 0,63 plot inside the tantalitetapiolite miscibility gap. On the basis of experimental works, boundaries of the miscibility gap are controlled by temperature, oxygen fugacity and phase structural state. An empirically determined miscibility gap is based only on data from granitic pegmatites. In a case of Duchonka leucogranite, the temperature is probably the key factor. The Duchonka pegmatitic leucogranite crystallized most likely at higher temperature compared to rare-element granitic pegmatites. For that reason, the tantalite-tapiolite miscibility gap has most probably smaller range at such conditions. The accessory Nb-Ta-W mineralization represented by ferrocolumbite, manganocolumbite, tungstenian ixiolite, pyrochlore, microlite, uranmicrolite was identified in the highly fractionated leucogranite at Dlhá dolina, near Gemerská Poloma. Characteristics feature of leucogranite from Dlhá dolina is elevated content of W, expressed also by increased content in Nb-Ta phases. The highest concentration are in tungstenian ixiolite (up to 35 wt.% WO3) and manganocolumbite (up to 10 wt.% WO3). Another specific feature is decrease of Mn/(Mn+Fe) ratio with increasing value of Ta/(Ta+Nb) ratio in the outer parts of some manganocolumbite crystals. This feature can be connected with crystallization of apatite,
Page 1 and 2: UNIVERZITA KOMENSKÉHO V BRATISLAVE
Page 3 and 4: Zadávací list dizertačnej práce
Page 5 and 6: Čestné vyhlásenie Čestne vyhlas
Page 7: Abstrakt CHUDÍK, Peter: Vzácnoprv
Page 11 and 12: Predhovor Predložená dizertačná
Page 13 and 14: 6.1.3.4 Vstup Ti do štruktúry col
Page 15 and 16: všeobecné poznatky o ich výskyto
Page 17 and 18: (Černý a Ercit 2005). Popri zried
Page 19 and 20: typu je charakteristický najmä st
Page 21 and 22: Komplexné typy pegmatitov sú char
Page 23 and 24: na nárast frakcionácie Nb-Ta z vo
Page 25 and 26: Podobne ako v predchádzajúcich su
Page 27 and 28: a Mn/(Mn+Fe) v okrajových častiac
Page 29 and 30: a mineralogických charakteristík
Page 31 and 32: protolítionitický granit do hĺbk
Page 33 and 34: má členy s Ta>Nb charakterom, kto
Page 35 and 36: wt.% P2O5 (Huang et al. 2002). Takt
Page 37 and 38: 3. Nb-Ta MINERALIZÁCIA V ZÁPADNÝ
Page 39 and 40: s fľakovitou zonalitou, pričom fe
Page 41 and 42: s pomermi Ta/(Ta+Nb) = 0,07-0,50 a
Page 43 and 44: zistený v jednom prípade ako lem
Page 45 and 46: 4. KLASIFIKÁCIA Nb-Ta OXIDOV A CHA
Page 47 and 48: 5. (M4O11) 6. (M3O8) Inverzný pyro
Page 49 and 50: Johan a Johan 1994, Wang et al. 199
Page 51 and 52: ix, c = cix, resp. usporiadaného w
Page 53 and 54: Ta, v menšej miere aj Fe a Mn, pr
Page 55 and 56: Ta/Nb nie je nikdy menší ako 1. D
Page 57 and 58: Obr. 19 Príklady koexistujúcich t
Page 59 and 60:
columbitmi. Ich rozdielnosť spoč
Page 61 and 62:
(pravdepodobne zodpovedajúca ixiol
Page 63 and 64:
skupiny wodginitu, nachádzajúceho
Page 65 and 66:
4.5 Skupina pyrochlóru Minerály t
Page 67 and 68:
typy viac frakcionovaných leukogra
Page 69 and 70:
5. METODIKA Pri výskume boli použ
Page 71 and 72:
5.2.2 RTG difrakčná analýza RTG
Page 73 and 74:
Pegmatit vystupuje v prostredí mus
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a Ca. Zirkón obsahuje 6-8 mol. % h
Page 77 and 78:
Ferotantalit sa pomerne často vysk
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V jednom prípade ferotantalitu mo
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Ferocolumbit až ferotantalit zo z
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Obr. 35 BSE snímky ferotapiolitu I
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široký rozsah pomeru Mn/(Mn+Fe) =
Page 87 and 88:
Ferowodginit I. generácie je v BSE
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Sn apfu 3 2,5 2 1,5 SnTi-1 1 0 0,5
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90 70 50 30 10 Ti 20 80 40 60 betaf
Page 93 and 94:
6.2.2 Mineralogická a geochemická
Page 95 and 96:
6.2.3 Nb-Ta mineralizácia Nb-Ta mi
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väčšine prípadov fázu zodpoved
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Obsahy Ti (max. 1,3 hm.% TiO2) a Sn
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zvýšeným obsahom K, Rb, Cs, Li,
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(obr. 50C, D). Manganocolumbit bol
Page 105 and 106:
6.3.2.2 Volfrámový ixiolit Volfr
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až uránmikrolit, tak aj pyrochló
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10,7 hm.% WO3, do 0,18 apfu). Na dr
Page 111 and 112:
7. DISKUSIA 7.1 Nb-Ta mineralizáci
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Všeobecne možno konštatovať, ž
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ohatých členov - ferotapiolitu a
Page 117 and 118:
v porovnaní s I. a II. generáciou
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ferotapiolit nachádza v najvrchnej
Page 121 and 122:
7.3 Nb-Ta mineralizácia v granite
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vzácnoprvkových granitov, ako sú
Page 125 and 126:
8. ZÁVER Vyhľadávanie a systemat
Page 127 and 128:
9. ZOZNAM BIBLIOGRAFICKÝCH ODKAZOV
Page 129 and 130:
Černý P. a Chapman R. (2001): Exs
Page 131 and 132:
Goodenough K.M., Upton B.G.J. a Ell
Page 133 and 134:
London D. (1997): Estimating abunda
Page 135 and 136:
Novák M., Černý P., Cempírek J.
Page 137 and 138:
Tindle A.G. a Breaks F.W. (2000): C
Page 139 and 140:
Súhrn Vyhľadávanie telies granit
Page 141 and 142:
ochudobnená o značné množstvo T
Page 143 and 144:
takmer vo všetkých prípadoch zat
Page 145 and 146:
and 0.73-0.86 (Fw I); Mn/(Mn+Fe) =
Page 147 and 148:
fractionation level. Ferrotantalite
Page 149 and 150:
PRÍLOHY
Page 151 and 152:
Lokalita Bratislava - Jezuitské le
Page 153 and 154:
minerál Fc Fc Fc Fc Fc Fc Fc Fc č
Page 155 and 156:
Page 157 and 158:
Page 159 and 160:
minerál Fc Fc Fc Fc Fc Fc Mc Mc č
Page 161 and 162:
minerál Fc Mc Fc Fc Fc Fc Fc Fc č
Page 163 and 164:
minerál Ft Ft Ft Ft Fc Fc Fc Fc č
Page 165 and 166:
minerál Ft Ft Ft Ft Ft Ft Ft Ft č
Page 167 and 168:
minerál Ft Ft Ft Ft Ft Ft Ft Ft č
Page 169 and 170:
minerál Ft Mt Mt Ft Ft Ft Ft Ft č
Page 171 and 172:
minerál Mt Mt Mt Mt Mt Mt Mt Mt č
Page 173 and 174:
minerál Ft Ft č. an. 177 178 WO3
Page 175 and 176:
minerál Tap Tap Tap Tap Tap Tap Ta
Page 177 and 178:
Page 179 and 180:
Page 181 and 182:
minerál Tap Tap Tap č. an. 235 23
Page 183 and 184:
minerál Wod Wod Wod Wod Wod Wod Wo
Page 185 and 186:
minerál Wod Wod Wod Wod Wod Wod Wo
Page 187 and 188:
minerál Mic Mic Mic Mic Mic Mic Mi
Page 189 and 190:
Lokalita Považský Inovec - Duchon
Page 191 and 192:
minerál Fc Ft Fc Fc Ft Fc Fc Ft č
Page 193 and 194:
minerál Ft Ft Fc Ft Ft Ft Ft Ft č
Page 195 and 196:
minerál Ft Ft Ft Ft Ft Fc Ft Ft č
Page 197 and 198:
minerál Ft Ft č. an. 65 66 WO3 0.
Page 199 and 200:
Lokalita Gemerská Poloma - Dlhá d
Page 201 and 202:
minerál Mc Mc Mc Mc Mc Mc Mc Mc č
Page 203 and 204:
minerál W-Ix W-Ix W-Ix W-Ix W-Ix W
Page 205 and 206:
minerál Mic Mic Mic Mic Mic Mic Mi
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