caa a22 4500 465791735 CHVBK 20180323112026.0 cr unu---uuuuu 170327e19901001xx s 000 0 eng 10.1007/BF00302496 doi (NATIONALLICENCE)springer-10.1007/BF00302496 The system Mg2SiO4-Ca2SiO4-CaAl2O4-NaAlSiO4-SiO2: one atmosphere liquidus equilibria of analogs of alkaline mafic lavas [Elektronische Daten] [Vivian Pan, John Longhi] One atmosphere liquidus relationships in the system Mg2SiO4 (Fo)−Ca2SiO4 (La)−NaAlSiO4 (Ne)−CaAl2O4 (CA)−SiO2 (Sil) are presented as analogs for alkaline mafic lavas. Liquidus diagrams are constructed from electron microprobe analyses of quenched liquids and coexisting mineral phases produced in melting experiments and they are depicted in terms of sub-projections within the pseudo-quaternary system Fo−La−[Ne,CA]−Sil. The Ne and CA components are combined to create a normative feldspathoid component defined as Ne#=Ne/[Ne+CA]. Liquidus relations at Ne#=0.5 from this study are compared to relations at Ne#=0.0 and 1.0 from previous studies. In general, liquidus temperatures decrease and positions of liquidus boundaries involving feldspathic phases shift toward the [Ne, CA] component as Ne# increases. The pseudoinvariant points fo+di+pl+mel+l and fo+pl+mel+sp+l exist at Ne#=0.5. These equilibria between forsterite-plagioclase-melilite-liquid are not present in the system when Ne#=1.0 because a boundary curve (fo+di+ne+l) separates the plagioclase and melilite liquidus fields. The liquidus diagrams provide useful analogs for the crystallization sequences of natural primary alkali olivine basalts, basanitoids, basanites, olivine nephelinites, olivine-melilite nephelinites and olivine melilitites. Springer-Verlag, 1990 Pan Vivian Department Geology and Geophysics, Yale University, 06511, New Haven, CT, USA aut Longhi John Lamont-Doherty Geological Observatory, 10964, Palisades, NY, USA aut Contributions to Mineralogy and Petrology Springer-Verlag 105/5(1990-10-01), 569-584 0010-7999 105:5<569 1990 105 410 https://doi.org/10.1007/BF00302496 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00302496 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Pan Vivian Department Geology and Geophysics, Yale University, 06511, New Haven, CT, USA aut NATIONALLICENCE 700 1- Longhi John Lamont-Doherty Geological Observatory, 10964, Palisades, NY, USA aut NATIONALLICENCE 773 0- Contributions to Mineralogy and Petrology Springer-Verlag 105/5(1990-10-01), 569-584 0010-7999 105:5<569 1990 105 410 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer