Boralsilite and Li,Be-bearing “boron mullite” Al8B2Si2O19,
breakdown products of spodumene from the Manjaka pegmatite,
Sahatany Valley, Madagascar.

J 2015

Boralsilite and Li,Be-bearing “boron mullite” Al8B2Si2O19, breakdown products of spodumene from the Manjaka pegmatite, Sahatany Valley, Madagascar.

NOVÁK, Milan, Jan CEMPÍREK, Petr GADAS, Radek ŠKODA, Michaela VAŠINOVÁ GALIOVÁ et. al.

Základní údaje

Originální název

Boralsilite and Li,Be-bearing “boron mullite” Al8B2Si2O19, breakdown products of spodumene from the Manjaka pegmatite, Sahatany Valley, Madagascar.

Autoři

NOVÁK, Milan (203 Česká republika, garant, domácí), Jan CEMPÍREK (203 Česká republika, domácí), Petr GADAS (203 Česká republika, domácí), Radek ŠKODA (203 Česká republika, domácí), Michaela VAŠINOVÁ GALIOVÁ (203 Česká republika, domácí), F. PEZZOTTA (380 Itálie) a L.A. GROAT (124 Kanada)

Vydání

Canadian Mineralogist, Ottawa, MAC, 2015, 0008-4476

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10500 1.5. Earth and related environmental sciences

Stát vydavatele

Kanada

Utajení

není předmětem státního či obchodního tajemství

Impakt faktor

Impact factor: 0.862

Kód RIV

RIV/00216224:14310/15:00081647

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.3749/canmin.1400092

UT WoS

000362880900013

Klíčová slova anglicky

boralsilite;boron mullite;spodumene;replacement;granitic pegmatite;Manjaka;Madagascar

Štítky

AKR, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 29. 3. 2016 14:14, Mgr. Michaela Vašinová Galiová, Ph.D.

Anotace

V originále

Boralsilite Al16B6Si2O37 and Li, Be-bearing "boron mullite" Al8B2Si2O19 were discovered as breakdown products of spodumene from the elbaite-subtype Manjaka granitic pegmatite, Sahatany Valley, Madagascar. Boralsilite assemblages are closely associated with prismatic spodumene crystals, up to 10 cm long, mostly as narrow albite ; K-feldspar zones (albite; K-feldspar; boralsilite; "boron mullite"), up to similar to 0.5 mm thick, or rarely as inclusions in the central parts of spodumene crystals. Long prismatic crystals and fibers of boralsilite, and rare elongated grains of "boron mullite" Al8B2Si2O19, are mostly enclosed in albite and rarely in K-feldspar. The EMP and LA-ICP-MS data yielded relatively variable Al/Si ratios (similar to 5.4-9.8; similar to 3.2-4.6) and concentrations of B (similar to 48500-59500; similar to 24000-28000 ppm), Li (688-1433; 3339-4287 ppm), and Be (288-1082; 1017-2728 ppm), in boralsilite and "boron mullite", respectively. Fluid/melt with very high a(B2O3), a(Na), and low a(H2O), along with high a(CO2) indicated by the absence of significant amount of hydrous phases, very minor extent of exocontact reactions along the pegmatite, and secondary rhodochrosite, are responsible for the origin of boralsilite. Very late solidus or early subsolidus conditions at temperature similar to 350-450 degrees C and pressure similar to 2-3 kbar, estimated for the crystallization of the assemblage albite + boralsilite, are significantly lower than those given for fibrous boralsilite at other localities of mostly anatectic granitic pegmatites (Larsemann Hills, Antarctica; Almgjotheii, Norway; and Horni Bory, Czech Republic).

Návaznosti

ED1.1.00/02.0068, projekt VaV

Název: CEITEC - central european institute of technology

GA14-13347S, projekt VaV

Název: Variabilita lehkých prvků (Li, Be, B) ve vybraných horninotvorných a akcesorických minerálech z felsických magmatických a metamorfovaných hornin

Investor: Grantová agentura ČR, Variabilita lehkých prvků (Li, Be, B) ve vybraných horninotvorných a akcesorických minerálech z felsických magmatických a metamorfovaných hornin

Citovat

NOVÁK, Milan, Jan CEMPÍREK, Petr GADAS, Radek ŠKODA, Michaela VAŠINOVÁ GALIOVÁ, F. PEZZOTTA a L.A. GROAT. Boralsilite and Li,Be-bearing “boron mullite” Al8B2Si2O19, breakdown products of spodumene from the Manjaka pegmatite, Sahatany Valley, Madagascar. Canadian Mineralogist. Ottawa: MAC, 2015, roč. 53, č. 2, s. 357-373. ISSN 0008-4476. Dostupné z: https://dx.doi.org/10.3749/canmin.1400092.

@article{1339567,
   author = {Novák, Milan and Cempírek, Jan and Gadas, Petr and Škoda, Radek and Vašinová Galiová, Michaela and Pezzotta, F. and Groat, L.A.},
   article_location = {Ottawa},
   article_number = {2},
   doi = {http://dx.doi.org/10.3749/canmin.1400092},
   keywords = {boralsilite;boron mullite;spodumene;replacement;granitic pegmatite;Manjaka;Madagascar},
   language = {eng},
   issn = {0008-4476},
   journal = {Canadian Mineralogist},
   title = {Boralsilite and Li,Be-bearing “boron mullite” Al8B2Si2O19, breakdown products of spodumene from the Manjaka pegmatite, Sahatany Valley, Madagascar.},
   volume = {53},
   year = {2015}
}

TY  - JOUR
ID  - 1339567
AU  - Novák, Milan - Cempírek, Jan - Gadas, Petr - Škoda, Radek - Vašinová Galiová, Michaela - Pezzotta, F. - Groat, L.A.
PY  - 2015
TI  - Boralsilite and Li,Be-bearing “boron mullite” Al8B2Si2O19, breakdown products of spodumene from the Manjaka pegmatite, Sahatany Valley, Madagascar.
JF  - Canadian Mineralogist
VL  - 53
IS  - 2
SP  - 357-373
EP  - 357-373
PB  - MAC
SN  - 00084476
KW  - boralsilite;boron mullite;spodumene;replacement;granitic pegmatite;Manjaka;Madagascar
N2  - Boralsilite Al16B6Si2O37 and Li, Be-bearing "boron mullite" Al8B2Si2O19 were discovered as breakdown products of spodumene from the elbaite-subtype Manjaka granitic pegmatite, Sahatany Valley, Madagascar. Boralsilite assemblages are closely associated with prismatic spodumene crystals, up to 10 cm long, mostly as narrow albite ; K-feldspar zones (albite; K-feldspar; boralsilite; "boron mullite"), up to similar to 0.5 mm thick, or rarely as inclusions in the central parts of spodumene crystals. Long prismatic crystals and fibers of boralsilite, and rare elongated grains of "boron mullite" Al8B2Si2O19, are mostly enclosed in albite and rarely in K-feldspar. The EMP and LA-ICP-MS data yielded relatively variable Al/Si ratios (similar to 5.4-9.8; similar to 3.2-4.6) and concentrations of B (similar to 48500-59500; similar to 24000-28000 ppm), Li (688-1433; 3339-4287 ppm), and Be (288-1082; 1017-2728 ppm), in boralsilite and "boron mullite", respectively. Fluid/melt with very high a(B2O3), a(Na), and low a(H2O), along with high a(CO2) indicated by the absence of significant amount of hydrous phases, very minor extent of exocontact reactions along the pegmatite, and secondary rhodochrosite, are responsible for the origin of boralsilite. Very late solidus or early subsolidus conditions at temperature similar to 350-450 degrees C and pressure similar to 2-3 kbar, estimated for the crystallization of the assemblage albite + boralsilite, are significantly lower than those given for fibrous boralsilite at other localities of mostly anatectic granitic pegmatites (Larsemann Hills, Antarctica; Almgjotheii, Norway; and Horni Bory, Czech Republic).
ER  -

NOVÁK, Milan, Jan CEMPÍREK, Petr GADAS, Radek ŠKODA, Michaela VAŠINOVÁ GALIOVÁ, F. PEZZOTTA a L.A. GROAT. Boralsilite and Li,Be-bearing “boron mullite” Al8B2Si2O19, breakdown products of spodumene from the Manjaka pegmatite, Sahatany Valley, Madagascar. \textit{Canadian Mineralogist}. Ottawa: MAC, 2015, roč.~53, č.~2, s.~357-373. ISSN~0008-4476. Dostupné z: https://dx.doi.org/10.3749/canmin.1400092.

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