While mapping in the Ariège region of the French Pyrenees, you discover an outcrop of an unusual igneous rock. The rock is quite coarse-grained and is dark colored with patches of dark green, due to abundant olivine. You estimate that the rock contains approximately 50% olivine, 45-50% pyroxene, and no more than about 5% garnet. In thin section, the pyroxene is identified as mostly orthopyroxene (about 30% of the rock), but there's also considerable clinopyroxene present (15-20% of the rock).   What is the rock name? ____________________________

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
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Please read over the questions carefully and answer the questions and label the corresponding diagram (attached image 1). (I have also added a closer up image of the bottom left diagram (image 2). 

Show your calculations and plot each rock on the appropriate blank classification diagram on the back of this page. Label your plotted points with the corresponding question number and label the corners of the diagram. 

4. While mapping in the Ariège region of the French Pyrenees, you discover an outcrop of an unusual igneous rock. The rock is quite coarse-grained and is dark colored with patches of dark green, due to abundant olivine. You estimate that the rock contains approximately 50% olivine, 45-50% pyroxene, and no more than about 5% garnet. In thin section, the pyroxene is identified as mostly orthopyroxene (about 30% of the rock), but there's also considerable clinopyroxene present (15-20% of the rock).  

What is the rock name? ____________________________ 

WL% (Na20+ K20)
14
12
2
Foldite
Tephrite
Basanite
Piero
Phono-
tephryte
Trachy
basalt
Dasall
Tephri
phonolite
Basaltic
trachy
60
Trachydacite
Trachy (20 %)
andesite
andesite
Trachyte
(q-20%)
Basaltic
andesite
Andesite
56
WL% S102
Dacite
Rhyolita
1
76
simbomsumbum .O.OM
80
VOY E
clads
Kanslov
in doon ot at adW
phaslov nótolt gilid alidW
LE OMA
d
Com doon sili zitad
Transcribed Image Text:WL% (Na20+ K20) 14 12 2 Foldite Tephrite Basanite Piero Phono- tephryte Trachy basalt Dasall Tephri phonolite Basaltic trachy 60 Trachydacite Trachy (20 %) andesite andesite Trachyte (q-20%) Basaltic andesite Andesite 56 WL% S102 Dacite Rhyolita 1 76 simbomsumbum .O.OM 80 VOY E clads Kanslov in doon ot at adW phaslov nótolt gilid alidW LE OMA d Com doon sili zitad
Na₂O+K₂0
2
0
4
16
12
10
14--
6
alkali rhyolite
quartz
alkali rhyolite
alkali trachyte
A
foid-bearing
alkali trachyte
phonolite
ultramafic
basanite
(01 > 10%)
10
picro-
basalt
40 44
tephrite
(01<10%)
mafic
foidite
phono-
tephrite
phonolitic foidite
trachy-
basalt
basalt
quartz
trachyte
trachyte
foid-bearing
trachyte
10
60
tephri-
phonolite
tephritic
phonolite
intermediate
phonolite
90
basaltic
trachy-
andesite
trachy-
andesite
basaltic
andesite
foid-bearing
latite
quartz
latite
andesite
48 52 56 60
SiO₂
F
50
trachyte
(Q<20%)
trachydacite
(Q>20%)
felsic
90
dacite
foidite
60
basalt &
andesite
tephritic foidite
64 68 72
rhyolite
phonolitic basanite (olivine > 10%)
phonolitic tephrite (olivine < 10%)
P
76
basanite (olivine > 10%)
tephrite (olivine < 10%)
bus inco
spontaneously only
minerals (and other
and entropy.
Enthalpy is the h
bonds of a substance
substance are differ
substance B will rel.
measure of "randor
tightly bonded aton
of an element in a ga
the same element in
the entropy of tha
entropy of an elem
Waals' bonds is his
Transcribed Image Text:Na₂O+K₂0 2 0 4 16 12 10 14-- 6 alkali rhyolite quartz alkali rhyolite alkali trachyte A foid-bearing alkali trachyte phonolite ultramafic basanite (01 > 10%) 10 picro- basalt 40 44 tephrite (01<10%) mafic foidite phono- tephrite phonolitic foidite trachy- basalt basalt quartz trachyte trachyte foid-bearing trachyte 10 60 tephri- phonolite tephritic phonolite intermediate phonolite 90 basaltic trachy- andesite trachy- andesite basaltic andesite foid-bearing latite quartz latite andesite 48 52 56 60 SiO₂ F 50 trachyte (Q<20%) trachydacite (Q>20%) felsic 90 dacite foidite 60 basalt & andesite tephritic foidite 64 68 72 rhyolite phonolitic basanite (olivine > 10%) phonolitic tephrite (olivine < 10%) P 76 basanite (olivine > 10%) tephrite (olivine < 10%) bus inco spontaneously only minerals (and other and entropy. Enthalpy is the h bonds of a substance substance are differ substance B will rel. measure of "randor tightly bonded aton of an element in a ga the same element in the entropy of tha entropy of an elem Waals' bonds is his
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