lava tubes kacey mccallister. purpose to examine and understand: formation of lava tubes where...
TRANSCRIPT
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Lava Tubes
• Kacey McCallister
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Purpose
To Examine and understand:• Formation of lava tubes• Where Oregon Lava tubes came from• Features located in Oregon lava tubes
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Area Map
• Lava tubes mostly south of bend but within the:
• Newberry Volcanic
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Newberry volcanoErupting near bend 80,000 years ago
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Horse Lava Tube System
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Formation of the lava tubes
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Arnold Lava tube system
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Classic lava cave shape
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Cutbacks/Keyhole
• A classic keyhole shape with different levels, caused by:
• Melting• Mechanical weathering
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Arnold ice cave
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-Due to the ability of lava tubes to be a great insulator once water percolates into the lava tubes and freezes. -Sometimes it completely fills the cave. -Used for it’s ice.
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Breakdown• Breakdown is one of the
best ways to discover a lava tube.
• Area of lava tube ceiling that has collapsed– Pre cooling– Ice destruction– Water erosion
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Lava bombs• Rolled on the top of
the lava tube flow• Sometime they will
exit through a window leaving these bomb like structures
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Wind cave
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Review
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Lavacicle
• Super heated gas on top of the Lava flow
• Melts the ceiling of the lava tube
• Shark tooth – Layers of lava over time
• Splash• Tubular– Gas escapes through
the middle of tube
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Sand castles
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• Ash from Mount. Mazama percolates into lava caves.
• Waters drips down forming these peaks and vallys
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Thousands of years to create
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And now…………………………….
• Drum roll please………
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Bat cave
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Braided flows
• Most lava flows intertwine like braided streams
• They also interact with older flows to form layers.
• Bat cave shows two layers
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Conclusion
• Lava tubes need a very basaltic flow to form• Classic flows include– Smooth even sides– Occasional breakdowns– Braided flows
• Special flows contain– Lavacilcles– Lava bombs– Sand castles