Results 131 to 140 of about 944 (183)
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Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1977
Abstract Melting experiments in vacuum at Fe-saturation for high-Ti basalt compositions 70215 and 15318 Red Glass, and low-Ti basalt composition 15555-15016, have defined equilibrium crystallization sequences and the liquid-lines-of-descent, and show that much of the chemical variety in the natural samples is due to near-surface ...
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Abstract Melting experiments in vacuum at Fe-saturation for high-Ti basalt compositions 70215 and 15318 Red Glass, and low-Ti basalt composition 15555-15016, have defined equilibrium crystallization sequences and the liquid-lines-of-descent, and show that much of the chemical variety in the natural samples is due to near-surface ...
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Petrogenesis of Archaean Tonalites
Geologische Rundschau, 1982The Archean tonalitic magma series is characterized by a high Al2O3 and Na2O content. Tertiary tonalites with similar major element composition have been generated in subduction zones. It is therefore suggested that the Archean tonalites was generated in relation to subduction zones, the primary magma of the series being of dioritic composition.
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1994
Abstract In this chapter we consider the derivation and mode of development of the spectrum of lava types that constitute the Solomon Islands Younger Volcanic Suite. By implication this may also cast a little light on the genesis of lavas of other island arcs, particularly those of dominantly intra-oceanic affiliation.
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Abstract In this chapter we consider the derivation and mode of development of the spectrum of lava types that constitute the Solomon Islands Younger Volcanic Suite. By implication this may also cast a little light on the genesis of lavas of other island arcs, particularly those of dominantly intra-oceanic affiliation.
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The Reaction Principle in Petrogenesis
The Journal of Geology, 1922It is now many years since petrologists first began to think of the crystallization of a molten magma in terms of the physicochemical principles governing the behavior of solutions. In the study of ordinary solutions a condition frequently found was that known as the eutectic relation.
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Petrogenesis of lunar troctolites
Journal of Geophysical Research: Planets, 1994Models of petrogenesis for lunar troctolites are severely constrained by the high Mg* (>88) values of the most primitive members of the Mg‐rich suite. Melts derived by partial melting of olivine cumulates to the lunar magma ocean have high Mg* but are strongly undersaturated with respect to plagioclase. Assimilation of lunar crust cannot bring these
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V. Petrogenesis and discussion
Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1971Abstract Basaltic magmas are formed by partial melting of a source rock of peridotitic composition (pyrolite) under upper mantle conditions. Experimental studies of the mineralogy of pyrolite and the melting relations of various basaltic magmas under high-pressure conditions are integrated in an attempt to present an internally ...
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Petrogenesis of Orangeites and Kimberlites
1995Many years of study have not resulted in general agreement concerning the petrogenesis of continental alkaline rocks. Unfortunately, petrologists, acting from a stance of promoting their own particular bias, be it geophysical, experimental, geochemical, or tectonic, have devised contradictory models for a given magma type.
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