Liquidus Equilibria in the System K2O–Na2O–Al2O3–SiO2–F2O−1–H2O to 100 MPa: II. Differentiation Paths of Fluorosilicic Magmas in Hydrous Systems
We investigated phase equilibria in the six-component system Na2O–K2O–Al2O3–SiO2–
F2O− 1–H2O at 100 MPa to characterize differentiation paths of natural fluorine-bearing
granitic and rhyolitic magmas. Topaz and cryolite are stable saturating solid phases in
calcium-poor systems. At 100 MPa the maximum solidus depression and fluorine solubility
in evolving silicic melts are controlled by the eutectics haplogranite–cryolite–H2O at 640° C
and∼ 4 wt% F, and haplogranite–topaz–H2O at 640° C and∼ 2 wt% F. Topaz and cryolite …
F2O− 1–H2O at 100 MPa to characterize differentiation paths of natural fluorine-bearing
granitic and rhyolitic magmas. Topaz and cryolite are stable saturating solid phases in
calcium-poor systems. At 100 MPa the maximum solidus depression and fluorine solubility
in evolving silicic melts are controlled by the eutectics haplogranite–cryolite–H2O at 640° C
and∼ 4 wt% F, and haplogranite–topaz–H2O at 640° C and∼ 2 wt% F. Topaz and cryolite …
Liquidus Equilibria in the System K2O–Na2O–Al2O3–SiO2–F2O−1–H2O to 100 MPa: I. Silicate–Fluoride Liquid Immiscibility in Anhydrous Systems
Liquidus relations in the four-component system Na2O–Al2O3–SiO2–F2O− 1 were studied
at 0· 1 and 100 MPa to define the location of fluoride–silicate liquid immiscibility and outline
differentiation paths of fluorine-bearing silicic magmas. The fluoride–silicate liquid
immiscibility spans the silica–albite–cryolite and silica–topaz–cryolite ternaries and the
haplogranite-cryolite binary at greater than 960° C and 0· 1–100 MPa. With increasing
Al2O3 in the system and increasing aluminum/alkali cation ratio, the two-liquid gap contracts …
at 0· 1 and 100 MPa to define the location of fluoride–silicate liquid immiscibility and outline
differentiation paths of fluorine-bearing silicic magmas. The fluoride–silicate liquid
immiscibility spans the silica–albite–cryolite and silica–topaz–cryolite ternaries and the
haplogranite-cryolite binary at greater than 960° C and 0· 1–100 MPa. With increasing
Al2O3 in the system and increasing aluminum/alkali cation ratio, the two-liquid gap contracts …
以上显示的是最相近的搜索结果。 查看全部搜索结果