Neco Model Questions Vol1 2021 Geography Question 45

Practice objective / multiple choice question 45 from the 2021 Neco Model Questions Vol1 Geography examination.

Neco Model Questions Vol1 2021 Geography Objective / Multiple Choice Medium Difficulty
Question 45 NECO_MODEL_QUESTIONS_VOL1 • 2021 • GEOGRAPHY • objective

A sedimentary rock sample has the following volume percentages: quartz 40 %, feldspar 30 %, calcite 20 %, mica 10 %. Their respective densities are: quartz 2.65 g cm⁻³, feldspar 2.55 g cm⁻³, calcite 2.71 g cm⁻³, mica 2.80 g cm⁻³. During metamorphism, calcite is completely replaced by garnet (density 4.30 g cm⁻³) and mica is transformed into biotite (density 3.00 g cm⁻³). The total mass of the rock remains unchanged. Determine the new volume percentages of quartz, feldspar, garnet and biotite in the metamorphosed rock (express each to one decimal place).

Answer Options

Correct Answer A. Quartz ≈ 43.5 %, Feldspar ≈ 32.7 %, Garnet ≈ 13.7 %, Biotite ≈ 10.2 %
B. Quartz ≈ 41.2 %, Feldspar ≈ 34.5 %, Garnet ≈ 15.0 %, Biotite ≈ 9.3 %
C. Quartz ≈ 44.0 %, Feldspar ≈ 31.0 %, Garnet ≈ 12.5 %, Biotite ≈ 12.5 %
D. Quartz ≈ 42.0 %, Feldspar ≈ 33.0 %, Garnet ≈ 14.0 %, Biotite ≈ 11.0 %
Correct Answer
A
Correct Option:
Quartz ≈ 43.5 %, Feldspar ≈ 32.7 %, Garnet ≈ 13.7 %, Biotite ≈ 10.2 %

About This Question

This is Neco Model Questions Vol1 2021 Geography Question 45. It is one of the objective questions from the 2021 Neco Model Questions Vol1 Geography examination.

Difficulty level: Medium .

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