Laramide Structures in the Franklin Mountains

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Laramide Structures in the Franklin Mountains

• Chris Andronicos
• Frank Tate
• Matt Miles
• Structural Geology and Tectonics Group

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Talk Outline

• Regional Geology
• Structure of the Northwest Franklins
• Fault analysis
• Conclusions

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Thrust faults
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Thrust faults
P-axis black squares T-axis red squares
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Fold axis andaxial surfaces
Folds trend northwest-southeast with steeply
dipping axial surface
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Strike slip faults
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Strike Slip Faults
P-axis black squares T-axis red squares
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All faults
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Tensile fractures
Tensile fracture are consistent with
southeast northwest extension
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All faults
P-axis black squares T-axis red squares
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Conclusions

• Structures in the Northwestern Franklin Mountains
  formed during Laramide Deformation
• Structures record Southwest-Northeast shortening
  and sub-horizontal extension
• Co-existing strike-slip and thrust faults are
  consistent with transpression

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Extensional Fault
N
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All faults
P-axis black squares T-axis red squares
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Extensional Fault
N
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