The Richmond and Greenwich slices of the Hamburg klippe in eastern Pennsylvania — Stratigraphy, sedimentology, structure, and plate tectonic implications

TL;DRAbstract

emplacement of the approaching older abyssal sediments, and (3) subduction-related deformation of all rocks of the Greenwich slice. The marginal basin was essentially closed by late Blackriveran to early Rocklandian time. Because the thick, buoyant continental crust of North America was unable to subduct beneath the microcontinent, the eastern margin of the North American craton was uplifted, exposing the miogeoclinal cover (Black River hiatus). At this time, deposition of the Jacksonburg Limestone and Martinsburg Formation exogeoclinal sequences began in response to uplift to the southeast. Stress continued to build up along the contact of the two plates during Rocklandian to Kirkfieldian time. Consequently, slices of continental basement from the eastern margin of North America were detached along southeasterly dipping ductile shear zones and were thrust into the overlying miogeoclinal sediments, resulting in the formation of a nappe system. The Richmond slice probably was thrust ont

Chat with Paper

AI Agents for this Paper