Lava Tubes Kacey McCallister. Purpose To Examine and understand: Formation of lava tubes Where Oregon Lava tubes came from Features located in Oregon.

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Presentation transcript:

Lava Tubes Kacey McCallister

Purpose To Examine and understand: Formation of lava tubes Where Oregon Lava tubes came from Features located in Oregon lava tubes

Area Map Lava tubes mostly south of bend but within the: Newberry Volcanic

Newberry volcano Erupting near bend 80,000 years ago

Horse Lava Tube System

Formation of the lava tubes

Arnold Lava tube system

Classic lava cave shape

Cutbacks/Keyhole A classic keyhole shape with different levels, caused by: Melting Mechanical weathering

Arnold ice cave

-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.

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

Lava bombs Rolled on the top of the lava tube flow Sometime they will exit through a window leaving these bomb like structures

Wind cave

Review

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

Sand castles

Ash from Mount. Mazama percolates into lava caves. Waters drips down forming these peaks and vallys

Thousands of years to create

And now……………………………. Drum roll please………

Bat cave

Braided flows Most lava flows intertwine like braided streams They also interact with older flows to form layers. Bat cave shows two layers

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