Post on 07-Jan-2016
description
Brothers Fault Zone
D. Dziekan
Overview
• Regionally extensive fault zone
• Faulting strikes mainly northwest
• Alec Butte overlooks faulting
Alec Butte
• Cinder cone
• Overlies olivine basalt dated at 6.68ma
• Formed before faulting– Cut by faults
• 2.89 ma Iron Mt. unbroken
• Dating planned of Alec Butte– determine if faults happened post 2.89ma
Dashed northwest, solid northeast
Brother’s Fault
• Dextral oblique-normal fault
• Strike-slip to dip-slip ratio 1:1
• Some faults crosscut normal strike
• Model designed to explain crosscut faults