(a) Write an equation for the reaction annite [KFe3AlSi3O10(OH)2]and pyrope garnet [Mg3Al2Si3012] form phlogopite [KMg3AlSi3010(OH)2] and almandine garnet [Fe3Al2Si3012]. (b) Write an expression for a distribution coefficient for biotite and garnet using molar fractions of iron and magnesium representing the phlogopite annite and pyrope-almandine solid solution.
(a) Write an equation for the reaction annite [KFe3AlSi3O10(OH)2]and pyrope garnet [Mg3Al2Si3012] form phlogopite [KMg3AlSi3010(OH)2] and almandine garnet [Fe3Al2Si3012]. (b) Write an expression for a distribution coefficient for biotite and garnet using molar fractions of iron and magnesium representing the phlogopite annite and pyrope-almandine solid solution.
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
Problem 1LR
Related questions
Question
![1. (a) Write an equation for the reaction annite [KFe3AlSi3O10(OH)2]and pyrope
garnet [Mg3Al2Si3O12] form phlogopite [KMg3AlSi3O10(OH)2] and almandine
garnet [Fe3Al2Si3012].
(b) Write an expression for a distribution coefficient for biotite and garnet using
molar fractions of iron and magnesium representing the phlogopite annite and
pyrope-almandine solid solution.
(c) Given the following chemical analyses (weight percent) of coexisting biotite
and garnet in a metamorphic rock. Biotite: FeO 17.98, MgO 10.51; Garnet
FeO 29.61, MgO 2.26. Using the figure use the temperature of formation of
the rock.
Biotite-Garnet
In KD Fe-M8
2.5
2.0
1.5 ---
1.0
9
10
11
12
Temperature 104/T (K)
13
14
15
I](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F9b417509-2184-4d0f-a750-e29914888bca%2Fdd026e11-8716-47dc-898a-a16f882522cf%2Fezmm94c_processed.jpeg&w=3840&q=75)
Transcribed Image Text:1. (a) Write an equation for the reaction annite [KFe3AlSi3O10(OH)2]and pyrope
garnet [Mg3Al2Si3O12] form phlogopite [KMg3AlSi3O10(OH)2] and almandine
garnet [Fe3Al2Si3012].
(b) Write an expression for a distribution coefficient for biotite and garnet using
molar fractions of iron and magnesium representing the phlogopite annite and
pyrope-almandine solid solution.
(c) Given the following chemical analyses (weight percent) of coexisting biotite
and garnet in a metamorphic rock. Biotite: FeO 17.98, MgO 10.51; Garnet
FeO 29.61, MgO 2.26. Using the figure use the temperature of formation of
the rock.
Biotite-Garnet
In KD Fe-M8
2.5
2.0
1.5 ---
1.0
9
10
11
12
Temperature 104/T (K)
13
14
15
I
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