The peridotite plugs of Rum: Crystal settling and fabric development in magma conduits

Lithos ◽  
2012 ◽  
Vol 134-135 ◽  
pp. 23-40 ◽  
Author(s):  
Marian B. Holness ◽  
Rachel Sides ◽  
David J. Prior ◽  
Michael J. Cheadle ◽  
Brian G.J. Upton
Keyword(s):  
Crystal Settling

The influence of crystal settling on the compositional zoning of a thin lamprophyre sill: A multi-method approach

Lithos ◽  
2012 ◽  
Vol 132-133 ◽  
pp. 37-49 ◽  
Author(s):  
Teresa Ubide ◽  
Enrique Arranz ◽  
Marceliano Lago ◽  
Carlos Galé ◽  
Patricia Larrea
Keyword(s):  
Compositional Zoning ◽  
Crystal Settling ◽  
Multi Method Approach ◽  
Method Approach

The Petrology of the Guiana Dolerites

1966 ◽  
Vol 103 (4) ◽  
pp. 320-335 ◽  
Author(s):  
D. D. Hawkes
Keyword(s):  
Filter Press ◽  
Main Trend ◽  
Guiana Shield ◽  
Crystal Settling ◽  
Intrusive Suite

AbstractTwo distinct suites of dolerite, the Roraima Intrusive Suite (Pre-cambrian) and the Minor Dyke Suite (?Mesozoic) intrude the Guiana shield. The dolerites of the Roraima Intrusive Suite, which occur as major dykes, inclined sheets and sills, are tholeiitic in character and have been strongly differentiated. The series orthopyroxene-dolerite → pigeonite-dolerite → ferrodolerite → leucogranophyre represents the main trend. Hornblende-granophyres represent heteromorphs of late pigeonite-dolerites and early ferrodolerites. Differentiation was accomplished mainly by crystal settling probably in the presence of convection currents; toward the close of crystallization a filter-press mechanism became operative. The Minor Dyke Suite comprises numerous small dykes of undifferentiated dolerite. The intrusion of these dykes may be related to orogenic movements in the adjacent Andean geosyncline.

A two-phase fluid model of crystal settling under variable gravity

1999 ◽  
Author(s):  
A. Alexandrou ◽  
H. Shi ◽  
N. Gatsonis ◽  
A. Sacco, Jr.
Keyword(s):  
Fluid Model ◽  
Two Phase ◽  
Crystal Settling ◽  
Variable Gravity ◽  
Phase Fluid

Crystal settling in a vigorously convecting magma chamber

Nature ◽  
1988 ◽  
Vol 332 (6164) ◽  
pp. 534-536 ◽  
Author(s):  
Daniel Martin ◽  
Roger Nokes
Keyword(s):  
Magma Chamber ◽  
Crystal Settling

scholarly journals Crystals stirred up: 1. Direct numerical simulations of crystal settling in nondilute magmatic suspensions

2012 ◽  
Vol 117 (E8) ◽  
pp. n/a-n/a ◽  
Author(s):  
Jenny Suckale ◽  
James A. Sethian ◽  
Jiun-der Yu ◽  
Linda T. Elkins-Tanton
Keyword(s):  
Numerical Simulations ◽  
Direct Numerical Simulations ◽  
Crystal Settling

The production of chemically stratified and adcumulate plutonic igneous rocks

1996 ◽  
Vol 60 (398) ◽  
pp. 99-114 ◽  
Author(s):  
Stephen R. Tait ◽  
Claude Jaupart
Keyword(s):  
Magma Chamber ◽  
Solidification Front ◽  
Thermal Structure ◽  
Field Evidence ◽  
Igneous Intrusions ◽  
Starting Conditions ◽  
Crystal Settling ◽  
Physical Reasons ◽  
Liquid Line Of Descent

AbstractWe review recent advances on the physical principles of crystallization in multicomponent systems, and use them to provide a framework for interpreting petrological and geochemical observations from igneous intrusions. The thermal structure of crystallizing boundary layers imposes strong constraints on the chemical and mineralogical compositions of the solid that can form from a given melt. The thermal problem is largely independent of the chemical composition of the melt, and sets the course of crystallization. A key problem to understand is the temperature of the solidification front (which we take to mean that point at which the last drop of liquid solidifies) particularly in the geologically relevant case in which the temperature at the cold boundary is below the eutectic temperature. Focussing on the solidification front rather than on the liquidus is a valuable perspective. Adcumulus growth requires specific conditions and much can be learned from trying to understand how these can develop from given starting conditions. We discuss the physical reasons and field evidence for the existence of mushy layers, where solid fraction and temperature vary by large amounts. In such regions of the magma chamber, thermodynamic equilibrium is nearly achieved locally and, for a given temperature, this specifies the composition of the interstitial melt. Thus, in a magma chamber, the whole liquid line of descent is present simultaneously. Compositional convection is likely to set in, and this exchange between the interior of the mushy layer and the main reservoir leads to a chemically stratified solid, and to adcumulus growth. The contribution of crystal settling to the floor cumulates is evaluated as a function of the magnitude of convective heat flux through the roof. It is shown that crystal settling is unlikely to overwhelm in-situ nucleation and growth at the floor.

Evolution of crystal-settling in magma-chamber convection

1988 ◽  
Vol 87 (1-2) ◽  
pp. 237-248 ◽  
Author(s):  
Stuart A. Weinstein ◽  
David A. Yuen ◽  
Peter L. Olson
Keyword(s):  
Magma Chamber ◽  
Crystal Settling
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