Chemical, Physical and Temporal Evolution of Magmatic Systems

Our understanding of the physical and chemical processes that regulate the evolution of magmatic systems has improved tremendously since the foundations were laid down 100 years ago by Bowen. The concept of crustal magma chambers has progressively evolved from molten-rock vats to thermally, chemically and physically heterogeneous reservoirs that are kept active by the periodic injection of magma. This new model, while more complex, provides a better framework to interpret volcanic activity and decipher the information contained in intrusive and extrusive rocks.
Igneous/metamorphic petrology, geochemistry, geochronology and numerical modelling all contributed towards this new picture of crustal magmatic systems. This book provides an overview of the wide range of approaches that can nowadays be used to understand the chemical, physical and temporal evolution of magmatic and volcanic systems.
Timescales of crustal magma reservoir processes: insights from U-series crystal ages
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Published:January 01, 2015
Abstract
The dynamic processes operating within crustal magma reservoirs control many aspects of the chemical composition of erupted magmas, and crystals in volcanic rocks provide a temporally constrained archive of these changing environments. In this review, I compile 238U–230Th ages of accessory phases and 238U–230Th–226Ra ages of bulk mineral separates of major phases. These data document that crystals in individual samples can have ages spanning most of the history of a volcanic centre. Age populations for accessory phases show protracted pre-eruptive crystal residence times but few crystals predate magmatic activity at a...
- absolute age
- accessory minerals
- allanite
- Australasia
- California
- case studies
- chemical composition
- crust
- crystal chemistry
- crystallization
- crystals
- epidote group
- eruptions
- geochemistry
- igneous rocks
- intrusions
- ion probe
- ion probe data
- Long Valley Caldera
- magma chambers
- magmas
- magmatism
- mass spectra
- mass spectroscopy
- methods
- Mono County California
- nesosilicates
- New Zealand
- North Island
- orthosilicates
- Pacific Coast
- plutonic rocks
- plutons
- processes
- residence time
- silicates
- sorosilicates
- spectra
- spectroscopy
- Taupo volcanic zone
- time scales
- United States
- uranium disequilibrium
- volcanic rocks
- volcanism
- Western U.S.
- Wyoming
- Yellowstone Hot Spot
- zircon
- zircon group