Geological position, mineral assemblages and contamination of
granitic pegmatites in the Moldanubian Zone, Czech Republic;
examples from the Vlastějovice region

J 2013

Geological position, mineral assemblages and contamination of granitic pegmatites in the Moldanubian Zone, Czech Republic; examples from the Vlastějovice region

NOVÁK, Milan; Tomáš KADLEC a Petr GADAS

Základní údaje

Originální název

Geological position, mineral assemblages and contamination of granitic pegmatites in the Moldanubian Zone, Czech Republic; examples from the Vlastějovice region

Název česky

Geologická pozice, minerální asociace a kontaminace granitických pegmatitů v moldanubiku, Česká republika; příklady z regionu Vlastějovice

Autoři

NOVÁK, Milan; Tomáš KADLEC a Petr GADAS

Vydání

Journal of Geological Sciences, 2013, 1802-6222

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10500 1.5. Earth and related environmental sciences

Stát vydavatele

Česká republika

Utajení

není předmětem státního či obchodního tajemství

Impakt faktor

Impact factor: 0.744

Označené pro přenos do RIV

Ano

Kód RIV

RIV/00216224:14310/13:00067007

Organizační jednotka

Přírodovědecká fakulta

DOI

https://doi.org/10.3190/jgeosci.132

UT WoS

000324553000003

Klíčová slova anglicky

tourmaline amphibole granitic pegmatites Fe-skarn fractionation contamination Vlastějovice Moldanubian Zone

Štítky

AKR, rivok

Změněno: 2. 4. 2014 16:14, Ing. Andrea Mikešková

Anotace

V originále

Three groups of pegmatites distinct in their geological position, age, internal structure, mineral assemblages and chemical composition of minerals (tourmaline, amphibole, garnet, biotite) were distinguished in the Vlastějovice region, Moldanubian Zone: a) tourmaline-bearing pegmatites (Qz+Kfs+Pl+Bt+Ms+Tur) enclosed in pre-Variscan orthogneiss, b) contaminated amphibole-bearing pegmatites (Pl+Qz+Amp+Kfs+Fl) cutting Fe-skarn, and c) tourmaline-bearing pegmatites cutting gneisses (Qz+Kfs+Pl+Bt+Ms+Ab+Tur+Grt) and Fe-skarn (Qz+Kfs+Pl+Bt+TurAb,Amp,Grt,Elb). The pegmatites enclosed in orthogneiss show simple internal structure and mineral assemblages, low tectonic and metamorphic overprint, and represent the earliest generation of granitic pegmatites in the Moldanubian Zone. The amphibole-bearing pegmatites, likely anatectic and related to the Variscan regional metamorphism, are spatially restricted to Fe-skarn body and highly variable in shape, size, in-situ Ca,Fe(F,REE)-contamination from host Fe-skarn and degree of hydrothermal overprint. The tourmaline-bearing pegmatites related to the Variscan magmatic event cut different rocks (gneisses, Fe-skarn) and belong to the Moldanubian rare-element pegmatite province. Tourmaline-bearing pegmatites were evidently generated from the granite-pegmatite body in the footwall contact of the Fe-skarn body. Degrees of the textural differentiation and geochemical fractionation of the individual tourmaline-bearing pegmatites are comparable to those of the respective parts of the parental footwall granite-pegmatite body. This observation seems consistent with the model of sequential derivation of pegmatite melts from evolving parental granite. Primitive to highly evolved and usually B-rich pegmatites originated during the Variscan orogeny from the MP conditions of ~6-7 kbars to the LP conditions of P ~2 kbars, and manifest that formation of various granitic pegmatites is an integral part of the tectono-magmatic evolution of the region.

Návaznosti

GAP210/10/0743, projekt VaV

Název: Chemické složení a stupeň strukturního uspořádání přírodních turmalínů - geochemické versus strukturní faktory

Investor: Grantová agentura ČR, Chemické složení a stupeň strukturního uspořádání přírodních turmalínů - geochemické versus strukturní faktory

Citovat

NOVÁK, Milan; Tomáš KADLEC a Petr GADAS. Geological position, mineral assemblages and contamination of granitic pegmatites in the Moldanubian Zone, Czech Republic; examples from the Vlastějovice region. Journal of Geological Sciences. 2013, roč. 58, č. 1, s. 21-47. ISSN 1802-6222. Dostupné z: https://doi.org/10.3190/jgeosci.132.

@article{1170056,
   author = {Novák, Milan and Kadlec, Tomáš and Gadas, Petr},
   article_number = {1},
   doi = {https://doi.org/10.3190/jgeosci.132},
   keywords = {tourmaline amphibole granitic pegmatites Fe-skarn fractionation contamination Vlastějovice Moldanubian Zone},
   language = {eng},
   issn = {1802-6222},
   journal = {Journal of Geological Sciences},
   title = {Geological position, mineral assemblages and contamination of granitic pegmatites in the Moldanubian Zone, Czech Republic; examples from the Vlastějovice region},
   volume = {58},
   year = {2013}
}

TY  - JOUR
ID  - 1170056
AU  - Novák, Milan - Kadlec, Tomáš - Gadas, Petr
PY  - 2013
TI  - Geological position, mineral assemblages and contamination of granitic pegmatites in the Moldanubian Zone, Czech Republic; examples from the Vlastějovice region
JF  - Journal of Geological Sciences
VL  - 58
IS  - 1
SP  - 21-47
EP  - 21-47
SN  - 18026222
KW  - tourmaline amphibole granitic pegmatites Fe-skarn fractionation contamination Vlastějovice Moldanubian Zone
N2  - Three groups of pegmatites distinct in their geological position, age, internal structure, mineral assemblages and chemical composition of minerals (tourmaline, amphibole, garnet, biotite) were distinguished in the Vlastějovice region, Moldanubian Zone: a) tourmaline-bearing pegmatites (Qz+Kfs+Pl+Bt+Ms+Tur) enclosed in pre-Variscan orthogneiss, b) contaminated amphibole-bearing pegmatites (Pl+Qz+Amp+Kfs+Fl) cutting Fe-skarn, and c) tourmaline-bearing pegmatites cutting gneisses (Qz+Kfs+Pl+Bt+Ms+Ab+Tur+Grt) and Fe-skarn (Qz+Kfs+Pl+Bt+TurAb,Amp,Grt,Elb). The pegmatites enclosed in orthogneiss show simple internal structure and mineral assemblages, low tectonic and metamorphic overprint, and represent the earliest generation of granitic pegmatites in the Moldanubian Zone. The amphibole-bearing pegmatites, likely anatectic and related to the Variscan regional metamorphism, are spatially restricted to Fe-skarn body and highly variable in shape, size, in-situ Ca,Fe(F,REE)-contamination from host Fe-skarn and degree of hydrothermal overprint. The tourmaline-bearing pegmatites related to the Variscan magmatic event cut different rocks (gneisses, Fe-skarn) and belong to the Moldanubian rare-element pegmatite province. Tourmaline-bearing pegmatites were evidently generated from the granite-pegmatite body in the footwall contact of the Fe-skarn body. Degrees of the textural differentiation and geochemical fractionation of the individual tourmaline-bearing pegmatites are comparable to those of the respective parts of the parental footwall granite-pegmatite body. This observation seems consistent with the model of sequential derivation of pegmatite melts from evolving parental granite. Primitive to highly evolved and usually B-rich pegmatites originated during the Variscan orogeny from the MP conditions of ~6-7 kbars to the LP conditions of P ~2 kbars, and manifest that formation of various granitic pegmatites is an integral part of the tectono-magmatic evolution of the region.
ER  -

NOVÁK, Milan; Tomáš KADLEC a Petr GADAS. Geological position, mineral assemblages and contamination of granitic pegmatites in the Moldanubian Zone, Czech Republic; examples from the Vlastějovice region. \textit{Journal of Geological Sciences}. 2013, roč.~58, č.~1, s.~21-47. ISSN~1802-6222. Dostupné z: https://doi.org/10.3190/jgeosci.132.

Přehled o publikaci