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Book Chapter

Rodinian collisional and escape tectonics in the Hudson Highlands, New York

By
Alexander E. Gates
Alexander E. Gates
Department of Earth and Environmental Sciences, Rutgers University, Newark, New Jersey 07102, USA
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David W. Valentino
David W. Valentino
Department of Earth Sciences, State University of New York at Oswego, Oswego, New York 13126, USA
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Matthew L. Gorring
Matthew L. Gorring
Department of Earth and Environmental Studies, Montclair State University, Upper Montclair, New Jersey, USA
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Eric R. Thern
Eric R. Thern
Department of Applied Geology, Curtin University of Technology, GPO Box U1987, Perth, Western Australia, 6107
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Jeffrey Chiarenzelli
Jeffrey Chiarenzelli
Department of Geology, State University of New York at Potsdam, Potsdam, New York 13676, USA
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Published:
October 06, 2006

Abstract

A new multidisciplinary research collaboration to study the western Hudson Highlands, New York, has unraveled a complex Rodinian tectonic history that will be illustrated by visiting key locations on this trip. New sensitive high-resolution ion microprobe (SHRIMP) data demonstrates a cryptic suture between a ca. 1.2–1.1 Ga island arc and sedimentary rocks from a deeply incised craton (Amazonia?). The 1.05 Ga collision between these two terranes produced westward-directed fold nappes, granulite facies metamorphism and the dominant subhorizontal gneissic foliation. Tectonic surge granite sheets were emplaced into the nappes. Bimodal (diorite and granite) plutons intruded the area prior to the onset of a steeply SE-dipping 35-km-wide dextral shear system that resulted from tectonic escape. Extensive iron remobilization and mineralization accompanied the shearing and post-kinematic pegmatite plutons mark the end of activity at ca. 980 Ma.

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