Geology 1-10 Concept Quiz: Igneous Rocks Name: Lab Section: Score: Questions 01
ID: 118377 • Letter: G
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Geology 1-10
Concept Quiz: Igneous Rocks Name: Lab Section: Score: Questions 01 through 10: For each of the following statements indicate the figure that best fits (either A or B). If both figures fit the statement than mark C:Combined. If neither figure applies to the statement than mark: D: Doesn't apply. (Note: Figure B has a gery dark fine-grained groundmass.) Figure A Figure B Fine-grained Groundmass K-Feldspar Quartz Pyrowene Phenocrysts 01. Found in the Sierra Nevada batholith. 02. Formed deep within the crust of the earth. 03. Formed at the earth's surface. 04. Of these two samples one most likely formed from magma generated at a subduction zone. (Hint that means one of the samples must be "most likely") 05. Formed by slow cooling of magma 06. Formed from magma generated at a divergent margin, without any assimilation or differentiation (fractional crystallization). 07. Could have formed from a magma generated by partial (fractional) melting of the asthenoshpere 08. Could have formed from a melt that has undergone either differentiation (fractional crystallization). or assimilation or both. 09. Formed from cooling lava flows on the side of a shield volcano. 10. Formed directly from the eruption of material from a composite volcano.Explanation / Answer
01: D phencryst formation is two stage process in first stage the magma cools slowly form phenocryst and then erupts to surface and fast cooling formed groundmass. However Batholith formation is one stage process and it doesn't contain phenocryst. A formed in shollows sedmentary rock so not related with batholith. however some time phenocryst may form
02 : D same reason
03:
04: C since at subduction magma first generate and then cool at deeperlevel and finally come to surface to form groundmass
05: A slow colin can form quartz and feldspar
06 B fraction of crystal (phenocryst) form with melt at deep may erupt to form groundmass
07 B
08 B
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