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GSA2015 ANNUAL MEETING & EXPOSITION

T214. Mountains across the Oceans: Caledonian, Variscan, and Volcanology
Appalachian Orogenies through Time
T218. Comparative Approaches to Studying Impact Ejecta
Disciplines: Tectonics/Tectonophysics; Structural Geology; Deposits and Volcanic Flows
Petrology, Metamorphic Disciplines: Volcanology; Planetary Geology
Advocate: Jacob E. Bleacher
Advocates: Jeffrey Marsh; Loic Labrousse; Nicolas Pinet;
Stacia M. Gordon Similarities between impact ejecta deposits and volcanic flows
are leading to comparable research approaches. Techniques for the
This session seeks abstracts concerning the Caledonian, study of both deposit types will be compared in this session.
Variscan, and Appalachian orogens and aims to have a wide
variety of geologic subdisciplines represented, with work from T219. Intraplate and Divergent Boundary Volcanism: A Tribute
geologists, geophysicists, and modelers. to the Distinguished Career of David Clague
Disciplines: Volcanology; Petrology, Igneous; Geochemistry
T215. Novel Methods, Applications, and Data Interpretations Advocates: Wendy A. Bohrson; Jacqueline Dixon
in Thermochronology
David Clague, 2015 MGPV Distinguished Career Award
Disciplines: Tectonics/Tectonophysics; Geochemistry; recipient, is recognized for his multidisciplinary, data-intensive
Geomorphology approach to studying volcanoes. This session will feature research
by those inspired by Dave’s many contributions to volcanology,
Advocates: Alexis K. Ault; William R. Guenthner petrology, and geochemistry.

This session highlights new thermochronometers, novel appli-
cations of existing thermochronometers, and innovative
approaches to interpreting complex datasets. Contributions
addressing a range of geologic questions and from the high to low
temperature thermochronology communities are encouraged.

T216. Recent Developments in Understanding Rift Systems:
What We’ve Learned and What We Still Don’t Know

Disciplines: Tectonics/Tectonophysics; Volcanology;
Sediments, Clastic

Advocates: Nathalie Nicole Brandes; Paul T. Brandes;
Audra E. Basal

This multidisciplinary session focuses on recent studies
concerning modern and ancient rift systems, including struc-
ture and tectonics, volcanic activity, ore deposit formation, and
sedimentation.

T217. Rift-Drift, Seafloor Spreading, and Subduction Zone GSA TODAY | www.geosociety.org/gsatoday
Tectonics of Collisional Orogens: Comparative Analysis
of the Circum-Mediterranean and Appalachian-Caledonian
Orogenic Belts

Disciplines: Tectonics/Tectonophysics; Structural Geology;
Geophysics/Geodynamics

Advocates: Andrea Festa; Yildirim Dilek

Contributions presenting new geological, geochemical,
geochronological, and geophysical data and tectonic models from
the Circum-Mediterranean and Appalachian-Caledenonian
orogenic belts are welcome in order to discuss processes involved
in different stages of their collision-driven geodynamic evolution.

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