23.1: The Grenville Orogeny and the rifting of Rodinia
- Page ID
- 23090
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Granite gneisses (1.1 Ga) and granites (1.0 Ga) are evidence for what tectonic event?
a. The rifting of Rodinia
b. The Taconian Orogeny
c. The rifting of Pangaea
d. The Grenville Orogeny
- Answer
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d. The Grenville Orogeny
The rifting of Rodinia opened which ocean basin?
a. the Pacific Ocean
b. the Iapetus Ocean
c. the Tethys Ocean
d. the Atlantic Ocean
- Answer
-
b. the Iapetus Ocean
What kinds of rocks record the break-up of Rodinia?
a. Granite and charnockite
b. Limestone and garnet schist
c. Basalt and immature clastic sediment
d. Granite and granite-gneiss
- Answer
-
c. Basalt and immature clastic sediment
What is the nature of the contact between the Blue Ridge basement complex and the Swift Run and/or Catoctin Formation?
a. Unconformity
b. Conformable sedimentation
c. Thrust fault
- Answer
-
a. Unconformity
What primary volcanic structure can be found in the Catoctin Formation?
a. Cooling columns
b. Pahoehoe texture
c. Stratovolcanoes
d. Fossil tree trunks
e. Volcanic bombs
- Answer
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a. Cooling columns
What is distinctive about the charnockites of the Blue Ridge basement complex, compared to other granitoids?
a. They have gold in them.
b. They have pyroxene in them.
c. They have garnet in them.
d. They have silicate minerals in them.
- Answer
-
b. They have pyroxene in them.