caa a22 4500 38640173X CHVBK 20180307112201.0 cr unu---uuuuu 161130e198911 xx s 000 0 eng 10.1017/S001675680000697X doi S001675680000697X pii (NATIONALLICENCE)cambridge-10.1017/S001675680000697X Cattell A. C. Department of Geology, University of Exeter, Exeter EX4 4QE, U.K. The Skye Main Lava Series: liquid density and the absence of basaltic hawaiites [Elektronische Daten] [A. C. Cattell] Basaltic hawaiite lavas are virtually absent in the Eocene Skye Main Lava Series, in contrast to relatively abundant basalts and hawaiites. Fractional crystallization from basalt to basaltic hawaiite involves extraction of a large proportion of plagioclase, and liquid densities thereby increase. From basaltic hawaiite to hawaiite titanomagnetite is a significant fractionating phase, and liquid densities decline. The coincidence between a gap in erupted compositions and a density maximum implies that liquid density exerted a strong control on ‘eruptibility' of magmas; basaltic hawaiites were too dense to be erupted. Density maxima occur in basalt suites if plagioclase fractionates before Fe-Ti oxides, and may explain compositional gaps in erupted magmas. Compositional gaps are not the inevitable result of density maxima; the density of the rock column above, and the fluid dynamics within, the magma chamber where differentiation occurs are also critical factors. Copyright © Cambridge University Press 1989 Geological Magazine Cambridge University Press 126/6(1989-11), 681-684 0016-7568 126:6<681 1989 126 GEO https://doi.org/10.1017/S001675680000697X text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S001675680000697X text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Cattell A. C. Department of Geology, University of Exeter, Exeter EX4 4QE, U.K NATIONALLICENCE 773 0- Geological Magazine Cambridge University Press 126/6(1989-11), 681-684 0016-7568 126:6<681 1989 126 GEO CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge