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Questions and Answers
Convergent plate boundaries are the sites where two lithospheric plates p______ t_______ each other.
Convergent plate boundaries are the sites where two lithospheric plates p______ t_______ each other.
push toward
What are the three types of convergent plate boundaries?
What are the three types of convergent plate boundaries?
oceanic - oceanic, oceanic - continental, continental - continental
What is produced by convergence of two oceanic plates?
What is produced by convergence of two oceanic plates?
island arc complexes
Island arcs are c________ chains of v________ islands bounded on the convex side by an oceanic t________.
Island arcs are c________ chains of v________ islands bounded on the convex side by an oceanic t________.
A_______ v______ are found all along the arc.
A_______ v______ are found all along the arc.
S_____________ is the process by whereby an oceanic plate bends downward at an ocean t______ and d________ into the mantle.
S_____________ is the process by whereby an oceanic plate bends downward at an ocean t______ and d________ into the mantle.
What marks the upper surface of a descending oceanic slab, causing shallow earthquakes to occur widely?
What marks the upper surface of a descending oceanic slab, causing shallow earthquakes to occur widely?
Arc magmas are produced by de__________ of the descending oceanic slab, producing wet partial m_______ of the overlying mantle.
Arc magmas are produced by de__________ of the descending oceanic slab, producing wet partial m_______ of the overlying mantle.
Arc magmas show a range of compositions, but most commonly what type of magma is produced?
Arc magmas show a range of compositions, but most commonly what type of magma is produced?
What forms a complex zone of highly deformed sediment and some ocean floor volcanic rocks above the subduction zone?
What forms a complex zone of highly deformed sediment and some ocean floor volcanic rocks above the subduction zone?
M___________ occurs with the high-t__________ belts associated with the m_________ arc and the high-p________ belts associated with the s___________ zone.
M___________ occurs with the high-t__________ belts associated with the m_________ arc and the high-p________ belts associated with the s___________ zone.
C___________ collision zones are the final stage of closure of an ocean b________ by subduction and show extreme d______________ of the crust.
C___________ collision zones are the final stage of closure of an ocean b________ by subduction and show extreme d______________ of the crust.
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Study Notes
Convergent Plate Boundaries Overview
- Convergent plate boundaries occur where two lithospheric plates push toward each other.
- These boundaries can lead to different geological features and processes, depending on the types of plates involved.
Types of Convergent Plate Boundaries
- Three types exist:
- Oceanic-Oceanic
- Oceanic-Continental
- Continental-Continental
Geological Features from Oceanic Plate Convergence
- Convergence of two oceanic plates results in ISLAND ARC COMPLEXES.
- Areas near these complexes often experience intense earthquakes and high volcanic activity.
Island Arcs Characteristics
- Island arcs are curved chains of volcanic islands, typically found near oceanic trenches.
- They are bounded on the convex side by an oceanic trench.
- ACTIVE VOLCANOES populate the entire length of these arcs.
Subduction Process
- SUBDUCTION involves an oceanic plate bending down at an ocean trench and moving into the mantle.
- This process initiates significant geological changes and can generate earthquakes.
Benioff Zone
- A BENIOFF ZONE marks the upper surface of a descending oceanic plate, characterized by shallow earthquakes along a dipping plane.
Magma Formation
- Arc magmas result from DEHYDRATION of oceanic slabs, leading to wet partial MELTING of the overlying mantle.
- Andesite is the most common composition found in arc magmas.
Accretionary Wedge Formation
- An "ACCRETIONARY WEDGE" forms above the subduction zone, consisting of highly deformed sediment and volcanic rocks from the ocean floor.
Metamorphism in Convergent Boundaries
- METAMORPHISM is prominent in high-TEMPERATURE belts associated with magmatic arcs and high-PRESSURE belts linked to subduction zones.
Continental Collision Zones
- CONTINENTAL collision zones represent the final stage of ocean basin closure through subduction.
- These zones demonstrate extreme DEFORMATION of the crust, reshaping the geological landscape.
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