Don't judge an orogen by its cover: Kinematics of the Appalachian décollement from seismic anisotropy

نویسندگان

چکیده

Abstract As North America collided with Africa to form Pangea during the Alleghanian orogeny, crystalline and sedimentary rocks in southeastern United States were thrust forelandward along Appalachian décollement. We examined Ps receiver functions better constrain kinematics of this prominent subsurface structure. From Southeastern Suture Margin Experiment (SESAME) other EarthScope stations on Blue Ridge–Piedmont megathrust, we find large arrivals from a 5–10-km-deep converter. argue that strong contrast dipping anisotropic foliation occurs at subhorizontal décollement, propose such geometry may be typical for décollement structures. Conversion polarity flips can explained by an east-dipping foliation, but orientation is odds overlying northeast-trending surface tectonic grain. suggest prior late northwest-directed head-on collision, accommodated early west-vergence, independent structural inheritance. The geophysical expression provides powerful tool investigating kinematics, especially where they are obscured fabric, disentangle complexities embody oblique collisional orogens.

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ژورنال

عنوان ژورنال: Geology

سال: 2022

ISSN: ['0091-7613', '1943-2682']

DOI: https://doi.org/10.1130/g50323.1