Abstract

Grenville-aged orogenesis along the southern margin of Laurentia as recorded in the Llano uplift of central Texas includes extensive plutonism, regional polydeformation, and dynamothermal and static metamorphism that occurred from 1.32 to 1.07 Ga. Multidisciplinary geologic studies in the southeastern Llano uplift have delineated the following tectonic domains: a polydeformed, highly transposed supracrustal sequence (Packsaddle domain) that is situated between a lesser deformed tonalitic to dioritic island arc terrane (Coal Creek domain) and a polydeformed granitic gneiss terrane (Valley Spring domain).

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