Large crystals found in a fine-grained groundmass can indicate:a.
origin from a magma with an early intrusive phase followed by an extrusive phase.
b. origin from a magma with an early extrusive phase followed by an intrusive phase.
c. a rock of mixed volcanic-plutonic origin.
d. origin from a magma with an early intrusive phase followed by an extrusive phase AND a
rock of mixed volcanic-plutonic origin.
e. origin from a magma with an early extrusive phase followed by an intrusive phase AND a
rock of mixed volcanic-plutonic origin.
Question 2Aphanitic, phaneritic, and porphyritic are textural terms that:a.
refer to fine-grained, course-grained, and mixed-grained crystal sizes, respectively.
b. refer to formation by slow cooling, fast cooling, and mixed cooling rates, respectively.
c. are indicative of volcanic, plutonic, and mixed plutonic-volcanic origins, respectively.
d. refer to fine-grained, course-grained, and mixed-grained crystal sizes, respectively, AND
are indicative of volcanic, plutonic, and mixed plutonic-volcanic origins, respectively.
e. all of these.
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Origin and Insertion