Workshop on the Extent and Longevity of Magma Mush

Workshop: Extent and Longevity of Magma Mush

Organizer: Catherine Annen (Volcanic and Magmatic Processes), annen@ig.cas.cz
When: 30-31 May 2024
Where: GFÚ lecture hall

A magma mush is a magma that contains a high proportion of crystals. A significant part of volcanic plumbing systems is thought to be composed of mush. They are important for our understanding of what causes volcanic eruptions and how some precious metal deposits are formed.
We are gathering 22 senior and early career scientists from 7 countries who study magma mush using different approaches including modelling, geophysics, structural geology, geochemistry, or petrology.
The objective of the workshop is to synthetise what we know about magma mush, identify where the knowledge gaps are, and discuss how we should orient our research to learn more.

The lava dome extruded by Mount St Helen contains more than 50% crystals and can be seen as an erupting magma mush. Source of photo: USGS Cascades Volcano Observatory

PROGRAM

Thursday 30 May

Chair: Catherine Annen
9:30-9:40 Welcome from the director of the Institute of Geophysics. Aleš Špičák
9:40-10:00 Introduction to the workshop. Catherine Annen
10:00-10:30 A 4D framework of the Yerington magmatic-hydrothermal system, and petrographic evidence for magmatic-hydrothermal crystal mush - key constraints on the nature, extent and duration of mush. Lawrence Carter
10:30-11:00 Generation, extent, and longevity of crustal mush columns: a case study in southern Calabria. Patrizia Fiannacca, Pavlína Hasalová

11:00-11:30 Coffee break

11:30-12:00 Geophysically detecting and estimating melt fraction in silicic systems. Graham hill
12:00-12:30 Insights into mush assembly and extent from thermal inversion of zircon populations. Gregor Weber

12:30-14:00 Lunch

Chair: Prokop Závada
14:00-14:30 Crystal mush maturity and the thermal state of magma reservoirs. Madeleine Humphreys
14:30-15:00 The remobilization of interstitial melt during intrusion: a rapid mechanism generating eruptible magma from mush. Alexandre Carrara
15:00-15:30 Flow and deformation microstructures in crystal mush in natural and analogous examples. Matěj Machek

15:30-16:00 Coffee break

16:00- 16:30 Crystallisation of a multicomponent melt with a mush from the perspective of an applied mathematician. Juraj Kyselica
16:30-17:00 Synthesis and discussion. Catherine Annen
17:00-18:00 Visit of Juraj’s mush experiment

Friday 31 May

Chair: Petra Maierová
9:30-10:00 Time scale of silicic melt segregation and magma ascent. Steve Sparks
10:00-10:30 Processes in magmatic mushes with focus on possible degassing structures Roberto Weinberg
10:30-11:00 Extent and duration of mush at mid-ocean ridges. Marine Boulanger

11.00-11:30 Coffee break

11:30-12:00 Field and textural constraints on the thickness of the mushy layer on the floor of the Bushveld magma chamber, South Africa. Rais Latypov and Sofya Chistyakova
12:00-12:30 Advances in igneous petrology: Coupled chemical maps & thermodynamic models to tackle mushes crystallization dynamics and crystal-melt segregation. Lyderic France

12:30-14:00 Lunch

Chair: Pavlína Hasalová
14:00-14:30 Parameterization of pressure-, temperature- and water-dependent melt productivity in felsic rocks, and its application in numerical models of porous melt flow. Petra Maierová
14:30-15:00 The effect of coupling heat and H2O transfer from a magma source on the generation of crustal mush columns. Catherine Annen
15:00-15:30 From dike to pluton: A multimillion year story. Maria Paula Castellanos Mendez

15:30-16:00 Coffee break

16:00-16:30 Deforming mushy waxes in the lab - a new concept of mushy magma mingling above lower crustal detachment horizons. Prokop Závada
16:30-17:00 Synthesis and discussion. Catherine Annen
17:00-18:00 Prokop‘s lab visits

From 18:00 Farewell drinks and BBQ