In:
Journal of Geophysical Research: Solid Earth, American Geophysical Union (AGU), Vol. 91, No. B6 ( 1986-05-10), p. 5887-5889
Abstract:
The idea that magmatic systems are open to intermittent gains and losses of mass and energy is hardly new. Eruptive, conductive, and hydrothermally convective losses are obvious, and both wall rock assimilation and mixing of discrete magma batches are petrological ideas with long and distinguished conceptual lineages. New ideas of the last decade are largely outgrowths of the mounting evidence that mixing and assimilation are ubiquitous, that heterogeneity and mixing in mantle source regions are common, and that few igneous rock suites are likely to reflect strictly closed‐system fractionation of single magma batches. The evidence has accumulated quickly on many fronts, owing in part to the wider availability of high‐precision analytical tools and the development of sophisticated methods for modeling the wealth of chemical and isotopic data. Detailed studies of zoned ash flow sheets, zoned and layered plutons, and macroscopically mixed igneous rocks have made petrologists aware that dynamic and nonequilibrium aspects of magma transport play important roles in the evolution of many magmatic systems. Technological advances have permitted routine experimentation over a wide range of pressures, providing kinetic data and phase equilibrum constraints essential to understanding both mantle source processes and magmatic evolution in crustal reservoirs. Finally, the plate tectonic synthesis and seafloor sampling programs have respectively provided the impetus for a detailed assessment of geochemical heterogeneity in a dynamic mantle and an important avenue for accomplishing that assessment.
Type of Medium:
Online Resource
ISSN:
0148-0227
DOI:
10.1029/JB091iB06p05887
Language:
English
Publisher:
American Geophysical Union (AGU)
Publication Date:
1986
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