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GSA 2019 Phoenix T21 Reading Igneous Textures

MI
MSA-Pegmatite Interest Group
Fri, Apr 5, 2019 3:24 PM

Greetings!

The Annual GSA meeting in Phoenix, Arizona, (22-25 September) is taking shape, and we
have this topical session to offer:

T21. Reading Igneous Textures

The primary textures of igneous rocks reflect the environments in which their magmas
solidify, which is usually not the same environment as at their sources. The multitude of
igneous textures signifies that natural magmas approach the equilibrium state from
conditions that may begin far from it, and they may be quenched before they achieve it.
Consider that granite, porphyry, pegmatite, stockschieder, aplite, granophyre, rhyolite, elvan,
vitrophyre, and obsidian are all textural variants of the same magma composition. For
plutonic igneous rocks, there is the added uncertainty of the extent to which they preserve
their original igneous character. Chemical tests of re-equilibration are important, but so is
texture as a means of discerning subsolidus morphologic changes among crystals. Reading
igneous textures is an important component of a petrologic study of process, and hence it is
paramount to the application of chemical principles or methods that rely on the attainment of
chemical equilibrium among phases in the system. This session, therefore, is an open call to
anyone working on aspects of igneous texture, from nanometer to macroscopic scales, on
the basis of field, laboratory, or numerical studies. All igneous rocks are included.

Rebecca Lange (University of Michigan) and Michael D. Higgins (Université du Québec à
Chicoutimi, Canada) will give invited presentations.

The Mineralogical Society of America is a sponsor of this session. We hope you will join us in
the Valley of the Sun to present your work on a topic that is much in need of discussion.

The GSA is posting meeting information at this site:
http://www.geosociety.org/GSA/Events/Annual_Meeting/GSA/Events/2019info.aspx

The abstract submission window opened April 1 and closes 11:59 PM (23:59) Pacific Time
on June 25. Our topical session is T21, and you can submit an abstract from a link in that
notice. We will remind you of this session toward the end of May.

Thank you for your consideration.

Conveners:
David London, University of Oklahoma
Monaliza Sirbescu, Central Michigan University

David London
School of Geology & Geophysics, University of Oklahoma
100 East Boyd Street, Room 710 Sarkeys Energy Center
Norman, Oklahoma 73019
(405) 325 3253 (o), (405) 325 3140 (f)

Electron Microprobe Laboratory: ou.edu/empl
Pegmatite Interest Group: www.minsocam.org/msa/Special/Pig/

Greetings! The Annual GSA meeting in Phoenix, Arizona, (22-25 September) is taking shape, and we have this topical session to offer: T21. Reading Igneous Textures The primary textures of igneous rocks reflect the environments in which their magmas solidify, which is usually not the same environment as at their sources. The multitude of igneous textures signifies that natural magmas approach the equilibrium state from conditions that may begin far from it, and they may be quenched before they achieve it. Consider that granite, porphyry, pegmatite, stockschieder, aplite, granophyre, rhyolite, elvan, vitrophyre, and obsidian are all textural variants of the same magma composition. For plutonic igneous rocks, there is the added uncertainty of the extent to which they preserve their original igneous character. Chemical tests of re-equilibration are important, but so is texture as a means of discerning subsolidus morphologic changes among crystals. Reading igneous textures is an important component of a petrologic study of process, and hence it is paramount to the application of chemical principles or methods that rely on the attainment of chemical equilibrium among phases in the system. This session, therefore, is an open call to anyone working on aspects of igneous texture, from nanometer to macroscopic scales, on the basis of field, laboratory, or numerical studies. All igneous rocks are included. Rebecca Lange (University of Michigan) and Michael D. Higgins (Université du Québec à Chicoutimi, Canada) will give invited presentations. The Mineralogical Society of America is a sponsor of this session. We hope you will join us in the Valley of the Sun to present your work on a topic that is much in need of discussion. The GSA is posting meeting information at this site: http://www.geosociety.org/GSA/Events/Annual_Meeting/GSA/Events/2019info.aspx The abstract submission window opened April 1 and closes 11:59 PM (23:59) Pacific Time on June 25. Our topical session is T21, and you can submit an abstract from a link in that notice. We will remind you of this session toward the end of May. Thank you for your consideration. Conveners: David London, University of Oklahoma Monaliza Sirbescu, Central Michigan University David London School of Geology & Geophysics, University of Oklahoma 100 East Boyd Street, Room 710 Sarkeys Energy Center Norman, Oklahoma 73019 (405) 325 3253 (o), (405) 325 3140 (f) Electron Microprobe Laboratory: ou.edu/empl Pegmatite Interest Group: www.minsocam.org/msa/Special/Pig/