In the Bowen's reaction series, which of the following mineral(s) is/are crystallized prior to amphibole?
A. Biotite
B. Clinopyroxene
C. K-feldspar
D. Forsterite
A. Biotite
B. Clinopyroxene
C. K-feldspar
D. Forsterite
Show Hint
- A and B only
- A, B and D only
- B only
- B and D only
The Correct Option is D
Solution and Explanation
Step 1: Recall the discontinuous branch of Bowen's reaction series. Bowen's reaction series describes the temperature at which different silicate minerals crystallize from a cooling magma. The discontinuous series describes the formation of ferromagnesian minerals.
Step 2: List the minerals in the discontinuous series in order of decreasing crystallization temperature. The order is: 1. Olivine (e.g., Forsterite, D) - Highest Temperature 2. Pyroxene (e.g., Clinopyroxene, B) 3. Amphibole 4. Biotite mica (A) - Lowest Temperature
Step 3: Identify the minerals that crystallize before (at a higher temperature than) amphibole. According to the series, both Olivine (Forsterite) and Pyroxene (Clinopyroxene) crystallize before amphibole.
Step 4: Check the other minerals. - Biotite (A) crystallizes after amphibole. - K-feldspar (C) is on the continuous branch and crystallizes at lower temperatures than amphibole. Conclusion: The minerals that crystallize prior to amphibole are Clinopyroxene (B) and Forsterite (D).
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