TS3.4 | PICO

In the continental crust, partial melting is now recognized as the main geological process responsible for the production of granites, crustal differentiation of major rheological changes. Many studies (geochemical, petrological, experimental, geodynamical modelling) have shown that partial melting occurring at the grain-scale has consequences at the crustal scale. During its long history heterogeneous continental crust has been through many tectonics cycles with synchronous partial melting and regional deformation. This pairing is critical: melt weakens the rocks allowing faster deformation within mountain building or rifting processes. Dilatant structural sites developed during orogenic deformation accumulate anatectic melt, which begins to crystallize there, before a subsequent shear-enhanced compaction event segregates highly fractionated melt with incredibly evolved compositions to higher crustal levels. These are mainly emplaced as pegmatites, which may be of considerable economic interest. Many interesting questions arise. How does the growth and progressive development of structures affect how melt migrate through the crust, on the grain and macroscales? Does it pump melt though the crust? What is the quantitative effect of partial melting on the effective viscosity of a migmatite? How fast can melt differentiate?
Studying such processes requires a multidisciplinary approach. Therefore we invite contributions to this session from structural analyses, geochemistry, petrology, experimental/rheological studies, field based observations, numerical modeling or geochronology that investigate partial melting at different scales in a heterogeneous and deforming continental crust.

Convener: Alexis Plunder | Co-conveners: Laurent Arbaret, Tanja Knoll, Edward Sawyer
| Thu, 11 Apr, 14:00–15:45
PICO spot 1

Thursday, 11 April 2019

PICO spot 1
Chairperson: Tanja Knoll, Alexis Plunder
Chairperson: Tanja Knoll, Alexis Plunder
14:02–14:04 |
PICO1.2 |
Christian Teyssier, Megan Korchinski, Donna L. Whitney, and Patrice F. Rey
Chairperson: Tanja Knoll, Alexis Plunder
14:04–14:06 |
PICO1.3 |
Deformation and dilatancy in granular magma mushes
Nick Petford and John Clemens
Chairperson: Tanja Knoll, Alexis Plunder
14:06–14:08 |
PICO1.4 |
Amicia Lee, Geoffrey Lloyd, Taija Torvela, and Andrew Walker
Chairperson: Tanja Knoll, Alexis Plunder
14:08–14:10 |
PICO1.5 |
Ralf Schuster, Benjamin Huet, Tanja Knoll, and Holger Paulick
Chairperson: Tanja Knoll, Alexis Plunder
14:10–14:12 |
PICO1.6 |
Heinrich Mali, Ralf Schuster, Tanja Knoll, and Benjamin Huet
Chairperson: Tanja Knoll, Alexis Plunder
14:12–14:14 |
PICO1.7 |
| Highlight
Eric Gloaguen, Charles Gumiaux, Romain Millot, Catherine Guerrot, Floriane Leopold dit Offite, Melanie Lete, Julie Michaud, Sarah Deveaud, Jérémie Melleton, Blandine Gourcerol, and Laurent Guillou-Frottier
Chairperson: Tanja Knoll, Alexis Plunder
14:14–14:16 |
PICO1.8 |
Magmatic foliation of the Neoproterozoic Deokjeongri granodiorite, Korea
Hee Jae Koh
Chairperson: Tanja Knoll, Alexis Plunder
14:16–14:18 |
PICO1.9 |
| Highlight
Joaquin Bastias, Richard Spikings, Alexey Ulianov, Teil Riley, Alex Burton-Johnson, and Massimo Chiaradia
Chairperson: Tanja Knoll, Alexis Plunder
Chairperson: Tanja Knoll, Alexis Plunder
14:20–14:22 |
PICO1.11 |
Laurent Arbaret, Mickael Laumonier, and Laurent Jolivet
Chairperson: Tanja Knoll, Alexis Plunder
14:22–14:24 |
PICO1.12 |
Alexis Plunder, Laetitia Le Pourhiet, Ludovic Raess, Charles Gumiaux, and Michel Pichavant