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GSA Meeting Session T219: Microanalysis of Trace Elements and Isotopes in Igneous Petrology
From: John Wolff <jawolff@xxxxxxx>GSA Meeting Session T219: Microanalysis of Trace Elements and Isotopes in Igneous Petrology
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Dear colleagues,
The Annual GSA meeting this year
should be a good one for igneous petrology. Please consider submitting
an abstract to topical session T219: "Microanalysis of Trace Elements
and Isotopes in Igneous Petrology: Applications to Genesis, Storage,
Evolution, Transport, and Eruption of Magma." As you know this approach
to igneous rocks is an important source of information about magmatic
processes. We hope to draw together numerous experts, investigators and
students to review the current state of the art and assess future
prospects in this exciting area. Our invited speakers are Adam Kent,
Tony Simonetti, and Lily Claiborne. The session description is given
below.
The abstract deadline is coming up - August 6th.
Best wishes,
John Wolff <jawolff@xxxxxxxxxxxx>
Frank Ramos <framos@xxxxxxxx>
Scott Boroughs <scott.boroughs@xxxxxxx>
T219. Microanalysis of Trace Elements and Isotopes in Igneous Petrology:
Applications to Genesis, Storage, Evolution, Transport, and Eruption of
Magma
Over
the past 10 – 15 years, microanalysis of trace elements and radiogenic
isotope ratios in volcanic and plutonic rocks, employing secondary
ion mass spectrometry (SIMS), laser ablation – inductively coupled
plasma mass spectrometry (LA-ICPMS), and microdrilling-dissolution
methods, has grown from a novel field to a major source of information
about igneous petrogenesis. Trace element and isotope ratio analyses of
phenocrysts, melt inclusions and matrix glasses at the microscopic scale
now regularly augment major and minor element data from electron
microprobe analysis in published studies of volcanic, plutonic and
mantle rocks. To some extent, these studies have supplanted traditional
major, trace-element and isotope studies of whole rocks as the main
source of information about the petrogenesis of igneous rocks,
especially as regards the roles of processes such as crystal growth and
differentiation, crustal contamination of mantle-derived magmas, and
transfer and inheritance of crystals between magma batches. In
particular, crystal isotope stratigraphy provides direct information
about mixing of different geochemical reservoirs during the
crystallization history of a magma batch. Application of diffusion
modeling to trace element and isotope ratio profiles through crystals
provides time constraints on magmatic processes. Fingerprinting of trace
elements and isotopes in melt inclusions and crystal cores exposes the
range of materials that are blended together in the final igneous rock,
while melt inclusions are windows into magmas prior to modification by
degassing. This session focuses on investigations that apply these
techniques, LA-ICPMS, SIMS, and microdrilling-dissolution, to problems
of igneous petrogenesis including, but not limited to, characterization
of mantle source regions, crustal contamination of magma, ‘antecrysts’
and their significance, timescales of magmatic processes, and eruption
and degassing. The intended emphasis is on petrological and geological
interpretations in specific case studies, rather than details of new
or refined analytical methods, except insofar as these lead to such
interpretations.
Invited speakers: Adam Kent, Tony Simonetti, Lily Claiborne
______________________
Prof. J.A. Wolff
Associate Director
School of the Environment
Washington State University
Pullman, WA 99164
Ph: 509 335 2825
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