Title

The thickness and Poisson’s ratio of the Earth’s crust beneath the North Central US

Presenter Information

Samantha Lucker

Department

Geosciences and Geological and Petroleum Engineering

Major

Geology and Geophysics

Research Advisor

Gao, Stephen S.

Advisor's Department

Geosciences and Geological and Petroleum Engineering

Funding Source

Opportunities for Undergraduate Research (OURE)

Abstract

The crustal thickness, structure, and composition (as reflected by the Poisson’s ratio) have been disputed for decades. Major geological structures in the area include the Mid-Continent Rift (MCR) and the Black Hills batholiths. In this project, we improved the spatial resolution of the H (crustal thickness) and PR (Poisson’s ratio) measurements in the region between N41 and N50 latitudes, and W90 and W110 longitudes by using broadband seismic data recorded by the USArray. In the region of the MCR we have established evidence for the original thinning of the crust by the receiver functions study and have provided evidence for the intrusion of mafic rocks and deposition of clastic sedimentary rocks which were responsible for the later crustal thickening. To the east a mid-crustal reflector can be identified at a depth of 20-30km. The Paleozoic sediments occur in most regions of the Superior Craton, Trans-Hudson Orogeny, Yavapai province and MCR.

Biography

Samantha Lucker is a senior graduating in May 2014 with a degree in Geology/Geophysics and a minor in communications. Her emphasis has been in geophysics and after graduation she plans to study gas hydrates in the Gulf of Mexico.

Research Category

Sciences

Presentation Type

Poster Presentation

Document Type

Poster

Location

Upper Atrium/Hall

Presentation Date

16 Apr 2014, 9:00 am - 11:45 am

Comments

Joint project with Yi Jiang

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Apr 16th, 9:00 AM Apr 16th, 11:45 AM

The thickness and Poisson’s ratio of the Earth’s crust beneath the North Central US

Upper Atrium/Hall

The crustal thickness, structure, and composition (as reflected by the Poisson’s ratio) have been disputed for decades. Major geological structures in the area include the Mid-Continent Rift (MCR) and the Black Hills batholiths. In this project, we improved the spatial resolution of the H (crustal thickness) and PR (Poisson’s ratio) measurements in the region between N41 and N50 latitudes, and W90 and W110 longitudes by using broadband seismic data recorded by the USArray. In the region of the MCR we have established evidence for the original thinning of the crust by the receiver functions study and have provided evidence for the intrusion of mafic rocks and deposition of clastic sedimentary rocks which were responsible for the later crustal thickening. To the east a mid-crustal reflector can be identified at a depth of 20-30km. The Paleozoic sediments occur in most regions of the Superior Craton, Trans-Hudson Orogeny, Yavapai province and MCR.