Question

The continuous series of Bowen’s reaction series is represented by

• A. the orthoclase - albite feldspar system
• B. the anorthite - albite system
• C. the forsterite - fayalite system
• D. the diopside - anorthite system

Hint:

Bowen’s reaction series is essential for understanding the crystallization of minerals from magma, especially the behavior of plagioclase feldspars in the continuous series.

Answer 1

The Correct Option is B

Step 1: Understanding Bowen’s reaction series. 
Bowen’s reaction series describes the sequence of crystallization of minerals from a cooling magma. It is divided into two branches: the discontinuous series and the continuous series. 
Step 2: Continuous series. 
The continuous series of Bowen's reaction series is represented by the anorthite - albite system. This system describes the solid-solution behavior of the plagioclase feldspar group, where anorthite (Ca-rich) and albite (Na-rich) are the two endmembers. As magma cools, plagioclase feldspar crystallizes in a continuous fashion, with the mineral composition shifting from anorthite to albite. 
Step 3: Comparing the other options. 
The orthoclase - albite feldspar system represents alkali feldspar but is not part of the continuous series.
The forsterite - fayalite system represents the olivine group, which is part of the discontinuous series. 
The diopside - anorthite system represents pyroxenes and feldspars, but it is not related to the continuous series.