Experimental evidence of three coexisting immiscible fluids in synthetic granitic pegmatite
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Abstract
We present an experimental study of synthetic peraluminous granite doped with H2O, B, P, and F, which confirms that aluminosilicate melt, hydrous fluid, and hydrosaline melt (high-temperature brine) can stably coexist at 450-900 ∞C and 0.1-0.2 GPa in bulk compositions similar to those of natural granitic pegmatites. Hydrosaline melt is not quenchable, unstable at room conditions, and requires special techniques for synthesis and preservation. Raman spectroscopy and electron microprobe analyses of hydrosaline melt synthesized in our experiments show that it is composed of H3BO3, Na3AlF6, AlPO4, H2O, and aluminosilicate components. Aluminosilicate melt saturated in both hydrosaline liquid and hydrous fluid at 850 °C and 0.2 GPa contains 3.6 wt% F, 4.2 wt% P2O5, and 4 wt% B2O3. Natural hydrosaline melts have previously been found as inclusions trapped in rock-forming minerals. They are not restricted to granites and can be effective agents for enhanced crystal growth, metasomatism, and ore formation. In addition, hydrosaline melts may account for many characteristic features of rare-element and miarolitic pegmatites, such as giant size and perfect shapes of crystals in pegmatite cores, diverse mineralogy, and strong enrichment in rare elements.
© 2015 by Walter de Gruyter Berlin/Boston
Articles in the same Issue
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- Infrared and Raman study of interlayer anions CO32–, NO3–, SO42– and ClO4– in Mg/Al-hydrotalcite
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- Thermodynamics and stability of pseudobrookite-type MgTi2O5 (karrooite)
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- Surface structures, stabilities, and growth of magnesian calcites: A computational investigation from the perspective of dolomite formation
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- An occurrence of igneous orthorhombic amphibole, Eriksberg gabbro, southern Sweden
- Crystal chemistry of Cr3+-V3+-rich clinopyroxenes
- The crystal structures of cesanite and its synthetic analogue—A comparison
- Disordered distribution of Cu in the crystal structure of leightonite, K2Ca2Cu(SO4)4 · 2H2O
- Neustädtelite and cobaltneustädtelite, the Fe3+ - and Co2+ -analogues of medenbachite
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- Letters. Isotopic and elemental partitioning of boron between hydrous fluid and silicate melt
- Experimental evidence of three coexisting immiscible fluids in synthetic granitic pegmatite
- Quantifying surface areas of clays by atomic force microscopy
- A new high-pressure phase of FeSi
Articles in the same Issue
- Formation of secondary pyrite and carbonate minerals in the Lower Williams Lake tailings basin, Elliot Lake, Ontario, Canada
- Hydroxyl in MgSiO3 akimotoite: A polarized and high-pressure IR study
- High-pressure IR-spectra and the thermodynamic properties of chloritoid
- Infrared and Raman study of interlayer anions CO32–, NO3–, SO42– and ClO4– in Mg/Al-hydrotalcite
- Effect of Fe oxidation state on the IR spectra of Garfield nontronite
- High-pressure single-crystal X-ray diffraction study of katoite hydrogarnet: Evidence for a phase transition from Ia3d →I4̅3d symmetry at 5 GPa
- The high-temperature P21/c-C2/c phase transition in Fe-free pyroxene (Ca0.15Mg1.85Si2O6): Structural and thermodynamic behavior
- Thermodynamics and stability of pseudobrookite-type MgTi2O5 (karrooite)
- Molecular orbital calculations on aluminosilicate tricluster molecules: Implications for the structure of aluminosilicate glasses
- Surface structures, stabilities, and growth of magnesian calcites: A computational investigation from the perspective of dolomite formation
- Spinels and other oxides in Mn-rich rocks from the Hutter Mine, Pittsylvania County, Virginia, U.S.A.: Implications for miscibility and solvus relations among jacobsite, galaxite, and magnetite
- An occurrence of igneous orthorhombic amphibole, Eriksberg gabbro, southern Sweden
- Crystal chemistry of Cr3+-V3+-rich clinopyroxenes
- The crystal structures of cesanite and its synthetic analogue—A comparison
- Disordered distribution of Cu in the crystal structure of leightonite, K2Ca2Cu(SO4)4 · 2H2O
- Neustädtelite and cobaltneustädtelite, the Fe3+ - and Co2+ -analogues of medenbachite
- Ciprianiite and mottanaite-(Ce), two new minerals of the hellandite group from Latium (Italy)
- Re-definition, nomenclature and crystal-chemistry of the hellandite group
- The new mineral baumstarkite and a structural reinvestigation of aramayoite and miargyrite
- Letters. Isotopic and elemental partitioning of boron between hydrous fluid and silicate melt
- Experimental evidence of three coexisting immiscible fluids in synthetic granitic pegmatite
- Quantifying surface areas of clays by atomic force microscopy
- A new high-pressure phase of FeSi
