V031
Magmatic Sedimentology: a Critical Appraisal of Crystal Re-distribution in Plutons

Session ID#: 74205

Session Description:
Many plutons preserve magmatic structures that bear a geometric resemblance to those in sedimentary rocks. Examples include mineral grading in layering apparently formed by hydrodynamical sorting, trough-like structures with local truncations consistent with erosion and re-deposition, fluid escape and loading structures, and fabrics defined by preferred grain orientations.

      We know little about the scale and mechanisms of crystal re-distribution during convection and magmatic flow in igneous bodies despite this playing a vital role in magmatic evolution. Solving the problem requires an understanding of the fluid dynamical behaviour of cohesive, particle-rich, high-viscosity systems undergoing solidification with or without an externally-imposed stress. A critical part of the solution will involve the development of robust proxies to decode the record of crystal re-distribution in now fully-solidified plutonic rocks. We welcome contributions from field, laboratory and theoretical studies of mass transport in solidifying magmatic systems, from layered mafic intrusions to granitoids.

Index Terms:

3618 Magma chamber processes [MINERALOGY AND PETROLOGY]
3625 Petrography, microstructures, and textures [MINERALOGY AND PETROLOGY]
3642 Intrusive structures and rocks [MINERALOGY AND PETROLOGY]
8032 Rheology: general [STRUCTURAL GEOLOGY]

Primary Convener:  Scott R Paterson, University of Southern California, Los Angeles, CA, United States
Conveners:  Marian B Holness, University of Cambridge, Earth Sciences, Cambridge, United Kingdom, Katie Erin Ardill, University of Southern California, Los Angeles, CA, United States and Charlotte Gordon, University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom
Primary Liaison:  Scott R Paterson, University of Southern California, Los Angeles, CA, United States
 
Forces, friction and fabric: microstructural controls on magmatic processes and fabrics (Invited) (487398)
George W Bergantz, Univ Washington, Seattle, WA, United States
 
Sedimentary layering in mafic intrusions: the Skaergaard trough bands (498291)
Zoja Vukmanovic1, Marian B Holness2, Gautier Nicoli1, Michael Stock1, Jens Christian O Andersen3, Samuel Weatherley4 and Victoria Honour5, (1)University of Cambridge, Cambridge, United Kingdom, (2)University of Cambridge, Earth Sciences, Cambridge, United Kingdom, (3)Univ Exeter, Cornwall, United Kingdom, (4)Teck Resources Limited, Vancouver, BC, Canada, (5)University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom
 
Crystal ­- melt separation in magmas: the field evidence (Invited) (511197)
Roberto Ferrez Weinberg, Monash University, School of Earth, Atmosphere and Environment, Clayton, VIC, Australia
 
Magma flow and igneous differentiation at high crystallinity: Beginning to see the light (515337)
Nick Petford, University of Northampton, Northampton, NN2, United Kingdom, John D Clemens, Stellenbosch University, Matieland, South Africa and Curt Koenders, University of Southampton, Southampton, United Kingdom
 
Implications of Multiple Magmatic Fabrics Reflecting Strains Caused by Local Flow and by Regional Stresses of Crystal Mushes in the Tuolumne Intrusive Complex, Sierra Nevada, CA (546272)
Scott R Paterson and Katie Erin Ardill, University of Southern California, Los Angeles, CA, United States
 
Mortar Texture and Magma Dynamics in the Kunene Anorthosite Complex, Angola (572058)
Trishya Owen-Smith1, Zoja Vukmanovic2, Jeremie Lehmann1, Grant Michael Bybee3 and Ben Hayes1, (1)University of Johannesburg, Department of Geology, Johannesburg, South Africa, (2)University of Cambridge, Cambridge, United Kingdom, (3)University of the Witwatersrand, School of Geosciences, Johannesburg, South Africa
 
Tectonic and Magmatic Fabrics in a Layered Granite Body at Remal Dam Site, India: Implications for the Origin of Low Temperature Gneissic Fabrics (576192)
Ritabrata Dobe, Kharagpur, West Bengal, India and Saibal Gupta, Indian Institute of Technology Kharagpur, Kharagpur, India
 
Schlieren-Bound Magmatic Structures Record Local Fl­ow-Sorting Events in Multi-Scale and Spatially Heterogeneous Magma Mush Mixing Bowls (594727)
Katie Erin Ardill, University of Southern California, Los Angeles, CA, United States, Scott R Paterson, Univ Southern California, Los Angeles, CA, United States and Calvin G Barnes, Texas Tech University, Geosciences, Lubbock, TX, United States
 
Dynamic development of mineral layering and crystal alignments by pulsed magmatic flow in crystal mush of an upper-crustal diabase sill (607778)
LeeAnn Srogi, Nikolas Watson and Timothy M Lutz, West Chester University, Earth and Space Sciences, West Chester, PA, United States
 
Phenocryst and microlite behavior documenting changing rheology of emplacement: The perspective from shallow emplacement of magma sheets in the Henry Mountains, Utah (628660)
Sven S Morgan, University of Michigan-Dearborn, Department of Natural Sciences, Dearborn, MI, United States, James J Student, Central Michigan University, Mount Pleasant, MI, United States and Matthew Garnett, None, None, United States
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