... of experiments conducted to locate the andalusite-topaz boundary in water-saturated peraluminous haplogranite melts in T-P-X space, where T = 700-650°C, P = 200 MPa, and X (A/NK = 1.1, 1.2, 1.3, 1.4, and F = 0, 1, 2, 4 wt.%).The starting materials are synthetic K-Na-Al-Si gels, with added H 2 O and AgF...

... curves among topaz, andalusite, muscovite, pyrophyllite, AlF 3 , and K n AlF 3+n built from our experiments, which have allowed us to determine the topaz stability field. Topaz is stable in solutions with HF concentrations from 3·10 −3 to 8·10 −1 m and with KF concentrations lower than 7.5·10 −3 m...

... of sulfur-species at pre-eruptive P and T conditions depends on bulk silicate melt composition, P , T , a sulfur-species in the fluid and the stability of sulfur-bearing minerals, ranging from 10 to 100 ppm level in felsic melts ( Keppler 2010 ; Huang and Keppler 2015 ) to >1 wt% in basaltic...

... compressibility ( K 0 ′ = d K T ,0 / d P , where K T ,0 = 1/β T ,0 ) be known. On the basis of five half-reversal, crystallization experiments in the literature, which collectively provide minimum temperatures of the fusion curve between 12 and 32 kbar, K 0 ′ (derived from the Birch-Murnaghan relation...

... conducted at GHz frequency, through the glass transition temperature ( T g ), using both platelet and backscattering geometries. The compositions of the four haplogranites are based on the addition of ~5 wt% each of the components Li 2 O, F 2 O –1 , Na 2 O, and K 2 O to a haplogranitic (HPG8) composition...

...Satoshi Okumura; Satoru Nakashima Abstract We determined near-infrared (NIR) molar absorptivities of hydroxyl group (4500 cm −1 ) and molecular water (5230 cm −1 ) in rhyolitic glasses at room temperature and at high temperature, 400–600 °C. Five rhyolitic glasses with 0.5–2.8 wt% total water were...

... vessel to perform differential thermal analysis of cryolite at high pressures. Temperatures of the α-β transition are as follows: 559.30 ± 0.23 °C (1 atm), 562.10 ± 0.28 °C (47 MPa), and 567.33 ± 0.23 °C (101 MPa). Cryolite melting temperatures increase as follows: 1011.4 ± 0.2 °C (1 atm), 1019.2 ± 0.4...

...-transition interval (Fig. 1 ; Moynihan et al. 1976 ; Scherer 1992 ; Debenedetti 1996 ). Because the extrapolated volume of the glass is equal to that of the fully relaxed liquid at T f ′, the following equation describes both: F igure 1. A schematic plot of volume vs. temperature. The limiting...

...) > 1; e.g., Koster van Groos and Wyllie 1968 ; Foley et al. 1986b , 1986a ; Mysen et al. 2004 ; Brey et al. 2009 ]. Additionally, F dissolution in silicate melt increases in peraluminous melts with excess network-modifying Al in fourfold coordination ( Webster et al. 2018 and references therein...

... describe the geological setting, petrography, and mineralogy of the Madeira albite-rich granite of the Pitinga province and discuss a crystallization model for this type of peralkaline albite-rich subsolvus granite. F ig . 1. (a) Geological map of the Pitinga Province. I Europa Granite, II Madeira...

... integrates both igneous and hydrothermal realms into the concept of transcrustal magmatic distillation columns. * E-mail: [email protected] . Manuscript handled by Daniel E. Harlov 1 12 2020 15 4 2021 Copyright © 2022 by the Mineralogical Society of America 2022 Mineralogical...

... investigated. However, the potential effect of temperature needs further investigation. D Ttn − melt F is positively correlated with melt ASI, and can be predicted using the following relation: D Ttn − melt F = 2.26 ∗ ASI − 1.05 . This equation is valid only for metaluminous melts (ASI < 1). The effect...

...I.S. Peretyazhko; S.Z. Smirnov; A.R. Kotel’nikov; Z.A. Kotel’nikova Abstract The phase state of fluid in the system H 3 BO 3 –NaF–SiO 2 –H 2 O was studied at 350–800 °C and 1–2 kbar by the method of synthetic fluid inclusions. The increase in the solubility of quartz and the high reciprocal...

... large crystals of perthitic K-feldspar (up to 5 cm in length) mantled by a thin layer of plagioclase. Quartz forms small, subrounded interstitial grains. There are also small proportions of ferromagnesian minerals (1–5 vol %), namely amphibole, minor fayalite and clinopyroxene, and trace proportions...

... was estimated within ±0.5 mN/m. Chemical composition of haplogranite melt (HPG8) is given in Table 1 . *Effect of water pressure at T = 1000 °C. †Effect of temperature at P H2O = 3 Kbar. ‡Estimated from weight losses within ±0.1 wt% after annealing of samples at 1 bar 1400 °C. § Data extrapolated...

... the effects of changing fluid composition (X H 2 O ) on Br fluid/melt partitioning for the first time. The experiments were conducted at pressures 50–120 MPa, temperatures 800–1100 °C, and volatile compositions [molar X H 2 O = H 2 O/(H 2 O +CO 2 )] of 0.55 to 1, with redox conditions around the Nickel-Nickel...

... ), Di Girolamo et al . ( 1995 ) and L. Melluso & S. Conticelli, unpub. data. Figure 10 Nepheline compositions, bulk-rock compositions and reference nepheline–kalsilite–silica diagram at 1 atmosphere and 1 kbar P H2O after Hamilton & MacKenzie ( 1965 ). Other inferred boundary...

...Paolo Papale; Roberto Moretti; Antonio Paonita (1) T ( 1 ) = T ( 2 ) = … = T ( π ) P ( 1 ) = P ( 2 ) = … = P ( π ) μ 1 ( 1 ) = μ 1 ( 2 ) = … = μ 1 ( π ) μ 2 ( 1 ) = μ 2 ( 2...

...Tang Yong; Robert L. Linnen; Alysha G. McNeil Abstract Peralkaline rocks (defined by molar (Na + K)/Al > 1) are typically enriched in Nb and halogens (such as F and Cl). They can further be subdivided into silica-saturated (e.g., alkali granites) and silica-undersaturated (e.g., nepheline...

..., Vielzeuf and Holloway, 1988 ) where no external fluid is required. Strictly, the distinction is between melting reactions where the presence of a significant volume of free aqueous fluid externally buffers the water activity of the system at 1 (water-saturated), and situations where water is released...