Title

The Role of Preexisting Basement Structures During Continental Collison: Insights from Analog “Sandbox” Modeling

Presenter Information

Caroline Fernandez

Department

Geosciences and Geological and Petroleum Engineering

Major

Geology

Research Advisor

Hogan, John Patrick

Advisor's Department

Geosciences and Geological and Petroleum Engineering

Abstract

During continental collision, reactivation of preexisting faults may influence the development of geologic structures that lead to the formation of mountain chains. For example, during crustal rifting normal faults develop in the basement as it is extended. During continental collision (i.e., compression), we predict these normal faults will reactivate as reverse faults and change the shape and evolution of the accretional wedge. To help us better understand the role of “inherited basement structures” in the formation of orogenic wedges, we designed three analog “sandbox” models to simulate continental collision, where layers of colored sand represent sedimentary rocks and rigid boards with cuts represent the basement with normal faults. Model 1 represents continental collision without preexisting faults. Model 2 represents continental collision where the basement contains several normal faults all dipping in the same direction. Model 3 simulates a continental collision where the basement contains “Horst” and “Graben” style normal faulting.

Biography

Caroline Fernandez is an undergraduate senior in Geology. Her hobbies include; pottery, glass blowing, camping, scrapbooking, rock collecting, and reading. She hopes to find an exciting career as a geologist in the field of mining.

Research Category

Research Proposals

Presentation Type

Poster Presentation

Document Type

Poster

Award

Research proposal poster session, First place

Location

Upper Atrium/Hallway

Presentation Date

07 Apr 2010, 9:00 am - 11:45 am

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Apr 7th, 9:00 AM Apr 7th, 11:45 AM

The Role of Preexisting Basement Structures During Continental Collison: Insights from Analog “Sandbox” Modeling

Upper Atrium/Hallway

During continental collision, reactivation of preexisting faults may influence the development of geologic structures that lead to the formation of mountain chains. For example, during crustal rifting normal faults develop in the basement as it is extended. During continental collision (i.e., compression), we predict these normal faults will reactivate as reverse faults and change the shape and evolution of the accretional wedge. To help us better understand the role of “inherited basement structures” in the formation of orogenic wedges, we designed three analog “sandbox” models to simulate continental collision, where layers of colored sand represent sedimentary rocks and rigid boards with cuts represent the basement with normal faults. Model 1 represents continental collision without preexisting faults. Model 2 represents continental collision where the basement contains several normal faults all dipping in the same direction. Model 3 simulates a continental collision where the basement contains “Horst” and “Graben” style normal faulting.