Phase diagrams Let s think about what happens to water as conditions ... Figure 21-9. The P-T phase diagram for the system Al2SiO5 calculated using the ...
Title: Sedimentary Materials Author: Greg dRUSCHEL Created Date: 4/1/2004 8:56:36 PM Document presentation format: On-screen Show Company: University of Vermont
Isograds for a single shale unit ... Degrades to almandine (garnet at higher T) staurolite muscovite quartz = almandine aluminosilicate biotite water ...
Chapter 26: Metamorphic Reactions If we treat isograds as reactions, we can: Understand what physical variables might affect the location of a particular isograd
Metamorphic Zones, Index Minerals, Isograds, Facies and Facies Series the onslaught of terminology to understand how we categorize metamorphic rocks and their ...
The Phase Rule in Metamorphic Systems Consider the following three scenarios: C = 1 (Al2SiO5) F = 1 common F = 2 rare F = 3 only at the specific P-T conditions of the ...
Metamorphic Facies: Reminder of principle metamorphic changes: 1/ Recrystallization changes in grain size responding to T & P changes. Coarsening of grains is common ...
Systematic spatial distribution in mineral assemblages that ... Gabal Yelleq (Sinai) contact aureole mineral zones. Metapelites metamorphic zones (Scotland) ...
Chapter 28: Metamorphism of Pelitic Sediments Mudstones and shales: very fine grained mature clastic sediments derived from continental crust Characteristically ...
Chapter 21: Metamorphism Fresh basalt and weathered basalt Coombs (1961) also proposed hydrothermal metamorphism Many areas of burial metamorphism are also ...
One of the primary goals of metamorphic petrology is to interpret P-T ... Albite-epidote hfls. Hornblende hfls. Pyroxene hfls. Sanidinite. 1. Pyroxene hornfels ...
... petrogenetic grid for metamorphosed mafic rocks showing the location of several determined univariant reactions in the CaO-MgO-Al2O3-SiO2-H2O-(Na2O) system ...
More Ca-rich plagioclases become progressively unstable as T lowered ... pressure-temperature-time paths based on a crustal thickening heat-flow model. ...
Metamorphic Rocks Metamorphism Literally translates to change of form In geology it refers to solid-state changes in mineral assemblages of a rock, and/or the ...
... for common tectonic scenarios. P-T-t paths for common tectonic scenarios ... P-T-t paths for common tectonic scenarios. Crustal thickening. Shallow magmatism ...
T-X phase diagram of the system albite-orthoclase at ... of several determined univariant reactions in the CaO-MgO-Al2O3-SiO2-H2O-(Na2O) system ( C(N)MASH ...
Structural insights into the early stages of exhumation along an orogen-scale ... Timing of Deformation U-Th-Pb monazite geochronology. Geological observations ...
Consider a plane of unit area oriented at an angle Q to the principal stress ... Plastic strength of rocks Continuum Mechanics: Brittle Failure Continuum ...
The term marble is used for metamorphosed calcareous rocks in which ... occurs as columnar, bladed or acicular grains, elongated parallel to c axis, may ...
They may be pure carbonate, or they may contain variable amounts of other ... The diagram focuses on ultramafic-carbonate rocks and omits reactions involving quartz. ...
P-T-t Paths and Their Significance Metamorphic Field Gradient Trend of Thermal Maxima Across Metamorphic Facies Clockwise P-T-t Path P-T-t Path Reflecting Crustal ...
17. Fe-chlorite quartz muscovite=almandine annite water ... almandine phlogopite pyrope annite. Small V makes it insensitive to P and large S/ V=dP/dT ...
Characteristically accumulate in distal portions of a wedge of ... Onawa aureole, Maine. Winter (2001) An Introduction to Igneous and Metamorphic Petrology. ...
Need to exist over narrow P-T range. The Phase Rule in Metamorphic Systems ... At the isograd. Above the isograd. Below the isograd. Bulk rock composition ...
Metamorphic Reactions * * Fig. 26-2 with the equilibrium curve contoured for various values of pH2O Figure 26-2. P-T phase diagram for the reaction Ms + Qtz = Kfs ...
... FM Diagram for Metapelites Most pelitic rocks can be described by the system K2O-Al2O3-FeO-MgO-SiO2-H2O Quartz ... K2O - CaO; K = K2O F = FeO + MgO + MnO Mineral ...
... seams of minerals Crenulated foliation Disjunctive cleavage Mineral lineation: nematoblastic: aligned acicular, columnar and prismatic grains of amphibole, ...
3/ Development of oriented fabric A pervasive planar fabric defined by parallel ... extended this study and introduced the concept of an isograd which is a contour ...