1) As magma cools, certain minerals crystallize first and at successively lower temperatures other minerals begin to crystallize 2) The order in which minerals crystallize from a melt is known as the Bowen's Reaction Series (BRS) 12 Page 13 CRYSTALLIZATION OF MAGMA According to Bowen's Reaction Series minerals crystallize following either the Continuous or Discontinuous reaction paths in the Continuous reaction series each mineral has the same crystalline structure in the Discontinuous reaction series each mineral has a different crystalline structure 13 Page 14 CRYSTALLIZATION OF MAGMA After 50% crystallization the magma composition is: &#9;- depleted in Fe, Mg, and Ca used up in the early formed minerals &#9;- enriched in Si, K, and Na, which is used in the later formed minerals the mineral make-up of igneous rocks is determined by the composition of the parent magma 14 Page 15 CRYSTALLIZATION OF MAGMA How do silicate minerals form?
(certain minerals; crystallize; first) (the Bowen's Reaction Series; crystallize following; either the Continuous or Discontinuous reaction paths in the Continuous reaction series) (other minerals; begin; T:at successively lower temperatures) (each mineral; has; the same crystalline structure in the Discontinuous reaction series) (the later formed minerals; is determined; by the composition of the parent magma 14) (other minerals; to crystallize; ) (each mineral; has; a different crystalline structure) (The order; crystallize; from a melt) (Na; is used; L:in the later formed minerals) (the magma composition; is; 13 Page 14 CRYSTALLIZATION OF MAGMA After 50% crystallization the magma composition is: &#9;- depleted in Fe, Mg, and Ca used up in the early formed minerals &#9) (The order in which minerals crystallize from a melt; is known; )
certain minerals the Bowen's Reaction Series other minerals each mineral the later formed minerals other minerals each mineral The order Na the magma composition The order in which minerals crystallize from a melt
crystallize crystallize following begin has is determined to crystallize has crystallize is used is is known
first
either the Continuous or Discontinuous reaction paths in the Continuous reaction series
T:at successively lower temperatures
the same crystalline structure in the Discontinuous reaction series
by the composition of the parent magma 14
a different crystalline structure
from a melt
L:in the later formed minerals
13 Page 14 CRYSTALLIZATION OF MAGMA After 50% crystallization the magma composition is: &#9;- depleted in Fe, Mg, and Ca used up in the early formed minerals &#9