3) Two common rock-forming minerals that crystallize at the highest temperatures

Question

3) Two common rock-forming minerals that crystallize at the highest temperatures in many mafic magmas are pyroxenes and feldspars. The crystallization of these two phases, and their removal from a crystallizing magma have the potential to change the composition of rocks that crystallize from the remaining magma. a) Describe two mechanisms through which these two minerals may be mechanically separated from a crystallizing magma and some factors that may aid or hinder their removal? (0 marks). b) Describe the major element compositional trends of the rocks that you would expect to produce remember to provide appropriate sketches and graphs to aid your descriptions.

Explanation / Answer

a) Describe two mechanism through which these two minerals may be mechanically separated from a crystallizing magma

a. 1. Fractional crystallization: is the removal and segregation from a melt of mineral precipitates. It is the removal of early formed crystals from an originally homogeneous magma by by gravity settling so that these crystals are prevented from further reaction with the residual melt. Gravity settling differs density differences between crystals and melt.

some other process are

2) flowage differentiation; 3) filter pressing and 4) dilation

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