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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Gurmeet Singh posted an Question
December 30, 2020 • 23:06 pm
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30 points
30 points
- IIT JAM
- Geology (GG)
D. the rock without feldspars essentially having olivine and pyroxenes in abundance is: a eucrite c. dunite b. troctolite d. picrite (bhu-2009)
D. The rock without feldspars essentially having olivine and pyroxenes in abundance is: A Eucrite C. Dunite B. Troctolite D. Picrite (BHU-2009)
3 Answer(s)
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Rahul kumar
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Answer: (C) Dunite Dunite contains excess amount of olivine and Pyroxene with minimal amount of feldspar. Other rocks (Picrite, Eucrite and Troctolite) contain abundant amount of plagioclase feldspar along with olivine and Pyroxene.
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Owishi Sarkar
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The answer is C) Dunite. Dunite is a rock containing more than 90% olivine and some pyroxene. Eucrite contains 30-35% feldspar. Troctolite is a rock containing feldspar, olivine, pyroxene and picrite though containing majorly olivine, pyroxene it also contains plagioclase feldspar.
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Saurabh 1 Best Answer
Most probably the answer has to be (C) Dunite. Dunite is mainly composed of olivine (around 90%) and pyroxene. Picrite is a intrusive igneous rock having ultramafic composition and is composed of large amount of olivine and pyroxene and have variable amount of plagioclase feldspar. Eucrite is bascially a member of a Meteorite group called HED meteorite(where H is for Howardite, E is for Eucrite and D for Diogenite and these were associated to parent asteroid body Vesta in the Asteroid belt) and this consists of plagioclase feldspar, olivine and pyroxene and have meteoric origin. Troctolite is basically in division of gabbro or a gabbroic rock having olivine and anorthitic rich plagioclase mainly bytownite and labradorite.