Results 171 to 180 of about 11,574 (221)

The New Petrogenesis?

Nature, 1957
L'Evolution de la Lithosphere Par Prof. Henri Termier et Dr.Genevieve Termier. 1 : Petrogenese. (Traite de Geologie.) Pp. iv + 654 + 54 plates. (Paris: Masson et Cie., 1956.) Broche, 8,000 francs; Cartonne toile, 8,800 francs.
openaire   +1 more source

Oxidation in High Temperature Petrogenesis

American Journal of Science, 1961
A study has been made of a variety of metamorphic and magmatic rocks to determine how oxidative processes are reflected in their mineral assemblages. In this study particular attention is paid to solid solutions. Field and experimental evidence agree with theory as to the responses of ferromagnesian solid solution to compositional changes of the ...
openaire   +1 more source

Petrogenesis of lunar troctolites

Journal of Geophysical Research: Planets, 1994
Models 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
openaire   +1 more source

The Reaction Principle in Petrogenesis

The Journal of Geology, 1922
It 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.
openaire   +1 more source

Petrogenesis of Archaean Tonalites

Geologische Rundschau, 1982
The 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.
openaire   +1 more source

Petrogenesis of Orangeites and Kimberlites

1995
Many 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.
openaire   +1 more source

Thermodynamics and Kinetics of Petrogenesis

1955
Thermodynamics deals with the equilibrium state of systems; applications of thermodynamic reasoning in geological sciences can therefore give more or less detailed pictures of what the Earth or parts of it should look like if the stable equilibrium state were attained.
openaire   +1 more source

Petrogenesis: 1: The lavas

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.
openaire   +1 more source

Petrogenesis of carbonatites

Goldschmidt2023 abstracts, 2023
openaire   +1 more source

PETROGENESIS II:

2022
openaire   +1 more source