Experimental study of monazite solubility in haplogranitic melts: A new model for peraluminous and peralkaline melts

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F19%3A10394720" target="_blank" >RIV/00216208:11310/19:10394720 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=~9sMEAXAMX" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=~9sMEAXAMX</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1127/ejm/2019/0031-2801" target="_blank" >10.1127/ejm/2019/0031-2801</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Experimental study of monazite solubility in haplogranitic melts: A new model for peraluminous and peralkaline melts

Popis výsledku v původním jazyce

Monazite is a common accessory mineral in peraluminous, metaluminous and peralkaline granitic/rhyolitic rocks. Considering the importance of monazite in geochemical and geochronological studies, a monazite solubility model that can be applied to a wide compositional range of magmas is desirable. To accomplish this, monazite solubility experiments were performed at atmospheric (1400 degrees C) and crustal pressures (1-3 kbar, 720-850 degrees C, H2O-saturated), using haplogranitic compositions ranging from peraluminous to peralkaline, doped with synthetic pure LaPO4. The concentrations of La in the melts increase sharply with increasing temperature and peralkalinity of the melt. We combined our new data with those of previous studies to describe the solubility of monazite in peralkaline to peraluminous melts. Our new monazite saturation model, which incorporates temperature, pressure, water content, melt and monazite composition is given by: ln Sigma LREE = 12.77(+/- 0.49) + 1.52(+/- 0.15)M + 0.44(+/- 0.10)(HO)(0.5)- 9934(+/- 632)/T - 36.79(+/- 6.15)P/T + lnX(mnz)(LREE) where Sigma LREE is the sum of the concentrations of La to Sm in monazite-saturated melt, in ppm, M is a dimensionless compositional parameter (Na + K + 2Ca) x Al-1 x (Al + Si)(-1), - similar to the compositional parameter used in an earlier model by Montel; Na, K, Ca, Al, Si are in moles, H2O is water content in weight percent, T is the temperature in K, P is the pressure in kbar, and X-mnz(LREE) is the mole fraction of LREE in monazite LREEmnz/ (LREEmnz+ Y-mnz+ Th-mnz+ U-mnz). This model reproduces 76% and &gt; 95% of the data to within uncertainties of +/- 10% and +/- 20%, respectively. It may be applied to felsic melts poor in CaO + FeO + MgO ( &lt; 3 wt%) from peraluminous to peralkaline compositions.

Název v anglickém jazyce

Experimental study of monazite solubility in haplogranitic melts: A new model for peraluminous and peralkaline melts

Popis výsledku anglicky

Monazite is a common accessory mineral in peraluminous, metaluminous and peralkaline granitic/rhyolitic rocks. Considering the importance of monazite in geochemical and geochronological studies, a monazite solubility model that can be applied to a wide compositional range of magmas is desirable. To accomplish this, monazite solubility experiments were performed at atmospheric (1400 degrees C) and crustal pressures (1-3 kbar, 720-850 degrees C, H2O-saturated), using haplogranitic compositions ranging from peraluminous to peralkaline, doped with synthetic pure LaPO4. The concentrations of La in the melts increase sharply with increasing temperature and peralkalinity of the melt. We combined our new data with those of previous studies to describe the solubility of monazite in peralkaline to peraluminous melts. Our new monazite saturation model, which incorporates temperature, pressure, water content, melt and monazite composition is given by: ln Sigma LREE = 12.77(+/- 0.49) + 1.52(+/- 0.15)M + 0.44(+/- 0.10)(HO)(0.5)- 9934(+/- 632)/T - 36.79(+/- 6.15)P/T + lnX(mnz)(LREE) where Sigma LREE is the sum of the concentrations of La to Sm in monazite-saturated melt, in ppm, M is a dimensionless compositional parameter (Na + K + 2Ca) x Al-1 x (Al + Si)(-1), - similar to the compositional parameter used in an earlier model by Montel; Na, K, Ca, Al, Si are in moles, H2O is water content in weight percent, T is the temperature in K, P is the pressure in kbar, and X-mnz(LREE) is the mole fraction of LREE in monazite LREEmnz/ (LREEmnz+ Y-mnz+ Th-mnz+ U-mnz). This model reproduces 76% and &gt; 95% of the data to within uncertainties of +/- 10% and +/- 20%, respectively. It may be applied to felsic melts poor in CaO + FeO + MgO ( &lt; 3 wt%) from peraluminous to peralkaline compositions.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

<a href="/cs/project/GA18-01982S" target="_blank" >GA18-01982S: Experimentální určení vlivu fugacity kyslíku na distribuci vysoce siderofilních prvků mezi minerály a taveninu v plášťových podmínkách</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

European Journal of Mineralogy

ISSN

0935-1221

e-ISSN

—

Svazek periodika

31

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

11

Strana od-do

49-59

Kód UT WoS článku

000460524200004

EID výsledku v databázi Scopus

2-s2.0-85063617979