Igneous Rocks Worksheet PDF

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Igneous rock lab assignment...

Description

IGNEOUS ROCKS WORKSHEET Sample number or letter

Texture (s) present

IR01

Porphyritic

IR02

IR03

IR04

IR05

IR06

Minerals present and Estimate their percentage of the abundance percentage of mafic minerals.

0%-15% quartz 0%-26% alkali feldspar 3%-49% plagioclase feldspar Aphanitic 0%-13% quartz and 0%-23% alkali Vesicular feldspar 18%-65% plagioclase feldspar Phaneritic 0%-15% quartz 0%-26% alkali feldspar 3%-49% plagioclase feldspar Phaneritic 0%-13% quartz 0%-23% alkali feldspar 18%-65% plagioclase feldspar Pegmatitic 16%-57% quartz or phaneritic 11%-68% alkali Feldspar 3%-49% plagioclase Feldspar No grains & 16%-57% quartz

Rock names (Fig.5.4,5.6,5.15,5.16)

Describe a geological environment where this rock might have formed (intrusive vs. extrusive, etc.).

25%-50%

Porphyritic Andesite

Extrusive

35%-65%

Basalt

Extrusive

25%-50%

Diorite

Intrusive

35%-65%

Gabbaro

Intrusive

5%-20%

Granite

Intrusive

5%-20%

Obsidian

Extrusive

glassy Felsic composition IR07

Phaneritic & Pegmatite (Felsic rock)

IR08

Phaneritic and Porphyritic, pegmatitic

IR09

Aphanitic &Pegmatite

IR10

Porphyritic & Phaneritic

11%-68% alkali Feldspar 3%-49% plagioclase Feldspar 16%-57% quartz 11%-68% alkali Feldspar 3%-49% plagioclase Feldspar 16%-57% quartz 11%-68% alkali Feldspar 3%-49% plagioclase Feldspar 16%-57% quartz 11%-68% alkali Feldspar 3%-49% plagioclase Feldspar 0%-13% quartz 0%-23% alkali feldspar 18%-65% plagioclase feldspar

5%-20%

Plutonic Granite

Intrusive

5%-20%

Pumice

Extrusive

5%-20%

Rhyolite

Extrusive

35%-65%

Scoria

Extrusive...