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Lesson 4 Assignment – Chapter 5 Investigation
Name:
Answer all questions. To complete this worksheet, see the instructions in the textbook (Chapter 5 Investigation, pages 136-137).
Table 1. Interpretation of Features, Tectonic Settings, and Causes of Melting
For each site on figure 5.15.a1 in the Chapter 5 Investigation in the textbook (also page 3 of this worksheet), identify the following:
•
the type of plate boundary or other setting. Possible choices include: (1) oceanic divergent, (2) continental rift, (3) ocean-ocean
convergent, (4) ocean-continent convergent, (5) continental collision, (6) hot spot in an ocean, or (7) hot spot in a continent. All
of these settings are not present in this area;
•
the most likely cause of melting. The options are (1) decompression melting either beneath a mid-ocean ridge or near a rising
mantle plume, (2) melting by adding water along a subduction zone, and (3) melting of continental crust caused by an influx of
mantle-derived magma. More than one of these causes might apply to a site.
Identify your answers by highlighting the text or changing it to Bold print.
Site
Name of Feature
A
Linear island chain
B
Circular volcanic
depressions, called
calderas
C
Mid-ocean ridge
D
Continental
magmatic arc
E
Island arc
Type of Plate Boundary or Other
Feature (circle the best answer)
(a) oceanic divergent, (b) ocean-ocean
convergent, (c) ocean-continent
convergent, (d) hot spot in an ocean
(a) continental rift, (b) ocean-continent
convergent, (c) continental collision, (d)
hot spot in a continent
(a) oceanic divergent, (b) ocean-ocean
convergent, (c) ocean-continent
convergent, (d) hot spot in an ocean
(a) continental rift, (b) ocean-continent
convergent, (c) continental collision, (d)
hot spot in a continent
(a) oceanic divergent, (b) ocean-ocean
convergent, (c) ocean-continent
convergent, (d) hot spot in an ocean
[ 10 points ]
Likely Cause of Melting
(circle all that apply)
(a) decompression melting as the mantle rises,
(b) melting by adding water along a subduction
zone, (c) melting of continental crust caused by
an influx of mantle-derived magma
(a) decompression melting as the mantle rises,
(b) melting by adding water along a subduction
zone, (c) melting of continental crust caused by
an influx of mantle-derived magma
(a) decompression melting as the mantle rises,
(b) melting by adding water along a subduction
zone, (c) melting of continental crust caused by
an influx of mantle-derived magma
(a) decompression melting as the mantle rises,
(b) melting by adding water along a subduction
zone, (c) melting of continental crust caused by
an influx of mantle-derived magma
(a) decompression melting as the mantle rises,
(b) melting by adding water along a subduction
zone, (c) melting of continental crust caused by
an influx of mantle-derived magma
Table 2. Characterization of Rock Samples
For each of the samples, choose the answer that best indicates the rock’s texture, composition, name, and interpreted cooling and
solidification history. [ 36 points ]
Sample
1
2
3
4
5
6
7
8
Crystal Size or Other Texture
(circle all that apply)
(a) large crystals, (b) medium-sized
crystals, (c) no visible crystals and not
vesicular, (d) no visible crystals but
vesicular (e) porphyritic
(a) large crystals, (b) medium-sized
crystals, (c) no visible crystals and not
vesicular, (d) no visible crystals but
vesicular (e) porphyritic
(a) large crystals, (b) medium-sized
crystals, (c) no visible crystals and not
vesicular, (d) flattened pieces of pumice
(e) porphyritic
(a) large crystals, (b) medium-sized
crystals, (c) no visible crystals and not
vesicular, (d) no visible crystals but
vesicular (e) porphyritic
(a) large crystals, (b) medium-sized
crystals, (c) no visible crystals and not
vesicular, (d) no visible crystals but
vesicular (e) porphyritic
(a) large crystals, (b) medium-sized
crystals, (c) no visible crystals and not
vesicular, (d) no visible crystals but
vesicular (e) porphyritic
(a) large crystals, (b) medium-sized
crystals, (c) no visible crystals and not
vesicular, (d) no visible crystals but
vesicular (e) porphyritic
Composition
(circle one)
(a) felsic
(b) intermediate
(c) mafic
Name of Rock
(circle one)
(a) granite
(b) rhyolite
(c) basalt
(a) felsic
(b) intermediate
(c) mafic
(a) granite
(b) rhyolite or tuff
(c) basalt
(a) felsic
(b) intermediate
(c) mafic
(a) welded tuff
(b) basalt
(c) gabbro
(a) felsic
(b) intermediate
(c) mafic
(a) basalt
(b) scoria
(c) pegmatite
(a) felsic
(b) intermediate
(c) mafic
(a) andesite
(b) gabbro
(c) pumice
(a) felsic
(b) intermediate
(c) mafic
(a) pegmatite
(b) basalt
(c) welded tuff
(a) felsic
(b) intermediate
(c) mafic
(a) large crystals, (b) medium-sized
crystals, (c) no visible crystals and not
vesicular, (d) no visible crystals but
vesicular (e) porphyritic
(a) felsic
(b) intermediate
(c) mafic
(a) between
granite and
diorite
(b) rhyolite
(c) scoria
(a) andesite
(b) tuff
(c) obsidian
Cooling and Solidification
History (circle one)
(a) slow, (b) moderate, (c)
fast, (d) slow then fast, (e)
slow cooling in the presence
of water
(a) slow, (b) moderate, (c)
fast, (d) slow then fast, (e)
slow cooling in the presence
of water
(a) slow, (b) moderate, (c)
fast, (d) slow then fast, (e)
slow cooling in the presence
of water
(a) slow, (b) moderate, (c)
fast, (d) slow then fast, (e)
slow cooling in the presence
of water
(a) slow, (b) moderate, (c)
fast, (d) slow then fast, (e)
slow cooling in the presence
of water
(a) slow, (b) moderate, (c)
fast, (d) slow then fast, (e)
slow cooling in the presence
of water
(a) slow, (b) moderate, (c)
fast, (d) slow then fast, (e)
slow cooling in the presence
of water
(a) slow, (b) moderate, (c)
fast, (d) slow then fast, (e)
slow cooling in the presence
of water
Sample
9
Crystal Size or Other Texture
(circle all that apply)
(a) large crystals, (b) medium-sized
crystals, (c) no visible crystals and not
vesicular, (d) no visible crystals but
vesicular (e) porphyritic
Composition
(circle one)
(a) felsic
(b) intermediate
(c) mafic
Name of Rock
(circle one)
(a) basalt
(b) gabbro
(c) rhyolite
Cooling and Solidification
History (circle one)
(a) slow, (b) moderate, (c)
fast, (d) slow then fast, (e)
slow cooling in the presence
of water
Table 3. Igneous Rock Environments
For each of the locations provided below, record the correct Plate Tectonic Setting and the name of an igneous rock that would most
likely be formed at that location. NB. The rock name should match the texture indicated. [ 14 points ]
Location
Texture
Eastern Caribbean Islands (Lesser
Antilles)
Intrusive
Yellowstone National Park
Extrusive
Western Mexico & Guatemala
Extrusive
East African Rift Valley
Intrusive
Solomon Islands
Extrusive
Iceland
Intrusive
The Cascade Mountains
Intrusive
Total Points = 60
Plate Tectonic
Setting
Rock Name