Measuring timescales of magmatic evolution

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doi: 10.2113/gselements.3.4.267
Authors:Turner, Simon; Costa, Fidel
Author Affiliations:Primary:
Macquarie University, Department of Earth and Planetary Sciences, Sydney, N.S.W., Australia
CSIC Institut de Ciències de la Terra Jaume Almera, Spain
Volume Title:Frontiers in textural and microgeochemical analysis
Volume Authors:Jerram, Dougal A., editor; Davidson, Jon P.
Source:Frontiers in textural and microgeochemical analysis, edited by Dougal A. Jerram and Jon P. Davidson. Elements, 3(4), p.267-272. Publisher: Mineralogical Society of America and Mineralogical Society of Great Britain and Ireland and Mineralogical Association of Canada and Geochemical Society and Clay Minerals Society, International. ISSN: 1811-5209
Publication Date:2007
Note:In English. 40 refs.; illus.
Summary:Advances in analytical methods have provided new insights into the timescales of magmatic processes. Data on the abundances of U-series isotopes in bulk rocks and crystal separates indicate magma differentiation over thousands of years. Residence and differentiation times of silicic magmas based on single-crystal, in situ age data vary from 10,000 to 100,000 years, with abundant evidence for crystal recycling from previous intrusive episodes. Chemical zoning patterns in single crystals indicate that processes such as mixing and mingling of magmas and crustal assimilation may occur over much shorter timescales of months to decades. Quantifying the rates of magma generation, emplacement and differentiation constrains the processes involved and may contribute to the evaluation of volcanic hazards.
Subsections:Igneous rocks
Subjects:Assimilation; Chemical analysis; Cooling; Crystal zoning; Crystallization; Degassing; Differentiation; Diffusion; Emplacement; In situ; Ion probe; Isotopes; Magmas; Magmatism; Mass spectroscopy; Methods; Mixing; Models; Overgrowths; Phenocrysts; Radioactive isotopes; Rates; Recycling; Residence time; Short-lived isotopes; Spectroscopy; Time scales; Transport; Uranium disequilibrium
Abstract Numbers:07M/3615
Record ID:2008024049
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute.
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