Volcano E: 43.9176 -121.357 1. What is the geological setting for this feature?
ID: 120473 • Letter: V
Question
Volcano E: 43.9176 -121.357
1. What is the geological setting for this feature?
island arc
continental arc
mid-ocean ridge
continental rift
continental hot spot
2. What types of volcanic materials formed this feature
mainly basaltic lava flows
combination of lava flows and pyroclastic flows
mainly pyroclastic debris
a rhyolitic lava flow
3.
Estimate the size of the feature, by measuring the diameter at the base
70 meters
700 m
3 km
7 km
15 km
island arc
continental arc
mid-ocean ridge
continental rift
continental hot spot
Explanation / Answer
1.
2. Mainly basaltic lava flows come from shield volcano. Because of less viscosity it forms lower height compared to its diameter.
Combination of lava flow and pyroclastic flow is found in composite cone or stratovolcano. Example- Fujiama of Japan.
Mainly pyroclastic debris froms pyroclastic cone or cinder cone, more or less conical in shape.
A rhyolitic lava flow forms lava dome or lava cone or plug dome. This forms a dome like landform with considerable height compared to its width.
Features Geological settings Island arc associated with subduction zone. Series of volcanoes that lies on the continental side of an oceanic trench of a lithospheric plate. Island arcs are the sites of strongseismic activity and have distinctive thermal and magnetic properties. Continental arc This arc is formed at continental active margin where two plates converge. It is an arc-shaped topographic high region along continental margin. Mid-ocean ridge A long, linear, elevated volcanic structure often lying along the middle of the oceanic floor. This is the result of divergent settings. At the center there is a rift valley, formed as discrete segments, bordered by high mountains on both sides. Continental rift Regions of extension or rifting. When hot material reaches the base of a continental plate and causes the lithosphere to heat up that is overlying. Continental hot spot Continental hot spot is an area of high volcanic activity.It occurs within lithospheric plates, lying at the end of a chain of progressively older volcanoes.Related Questions
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