Experimental petrology of alkalic lavas: constraints on cotectics of multiple saturation in natural basic liquids
@article{Sack1987ExperimentalPO, title={Experimental petrology of alkalic lavas: constraints on cotectics of multiple saturation in natural basic liquids}, author={Richard O. Sack and David Walker and Ian Carmichael}, journal={Contributions to Mineralogy and Petrology}, year={1987}, volume={96}, pages={1-23} }
Experimental study of natural alkalic lava compositions at low pressures (pO2∼QFM) reveals that crystallization of primitive lavas often occurs in the sequence olivine, plagioclase, clinopyroxene, nepheline without “obvious” reaction relation. Pseudoternary liquidus projections of multiply saturated liquids coexisting with plagioclase (±olivine±clinopyroxene±nepheline) have been prepared to facilitate graphical analysis of the evolution of lava compositions during hypabyssal cooling. Use of…
205 Citations
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References
SHOWING 1-10 OF 69 REFERENCES
Composition of liquids coexisting with spinel lherzolite at 10 kbar and the genesis of MORBs
- Geology
- 1985
Because of the controversy over the nature of the parental magma for MORBs, experiments have been performed at 10 kbar in order to assess the effect of modal variations in the source peridotite and…
Fractionation of pyroxene-phyric MORB at low pressure: An experimental study
- Geology
- 1983
One-atmosphere melting experiments are used to assess the role of clinopyroxene in producing the compositional variations observed in mid-ocean-ridge basalts (MORBs) from the North Atlantic. Analog…
Petrology of the leucite‐bearing lavas in New South Wales∗
- Geology
- 1973
Abstract Several isolated outcrops of melanocratic leucitite lava in central New South Wales are interpreted as remnants of flows erupted in late Cainozoic time by small lava‐volcanoes. The general…
Abyssal tholeiites from the Oceanographer Fracture Zone
- Geology
- 1979
Fresh basalts from the Oceanographer Fracture Zone are petrographically and chemically similar to typical abyssal tholeiites, but are somewhat enriched in large ion lithophile elements, with…
Mantle‐derived amphibole within inclusions in alkalic‐basaltic lavas
- Geology
- 1974
Amphibole in mantle-derived inclusions in alkalic-basaltic rocks occurs in four textural modes: veins and interstitial grains in chromian-spinel peridotite, poikilitic grains in igneous textured…
Quaternary lavas from the southern Cascades, western U.S.A.
- Geology
- 1968
A series of basaltic and andesitic lavas from three centers in the Cascades (Lassen, Medicine Lake, Mt. Shasta) have been investigated. The lavas are weakly porphyritic, containing phenocrysts of…
Stages in the P-T path of ascending basalt magma: An example from San Quintin, Baja California
- Geology
- 1973
AbstractLate Pleistocene or Recent lavas from San Quintin, Baja California are basanitoids and alkali basalts. The surface quench temperatures of the lavas average 1 005° C with log …
Experimental Studies Bearing on the Origin of Pseudoleucite and Associated Problems of Alkalic Rock Systems
- Geology
- 1963
Selected parts of the system nepheline-kalsilite-silica-water were studied at elevated temperatures and, for the most part, at a constant P H 2 o of 1000 bars. Concomitantly, experimental work was…