Champlain thrust

Champlain thrust

The Champlain Thrust Fault extends southward from southern Quebec, though western Vermont (in the Champlain Valley), and into eastern New York (in the Hudson Valley). This east dipping thrust fault transports Cambrian-Ordovician passive margin shelf rocks westerward by ~30 to 50 miles and places them on top of Middle Ordovician rocks. The Middle Ordivician accretion of the one or more island arcs terranes drove the initial thrusting during the Taconic Orogeny, though reactivation of the fault may have occurred during the middle Devonian Acadian Orogeny [ Nicholas W. Hayman and W. S. F. Kidd., Reactivation of prethrusting, synconvergence normal faults as ramps within the Ordovician Champlain-Taconic thrust system., Geological Society of America Bulletin (April 2002), 114(4):476-489] .

The thrust fault is beautifully exposed just to the north of the city of Burlington Vermont on the shores of lake champlain at Lone Rock Point. Here the Lower Cambrian Dunham Dolostone can be seen thrust on top of the Middle Ordovician Iberville shales.

The Champlain Thrust marks the most westerly thrust of the Taconic Orogeny.

Links

Additional information can be found on the Vermont State Geologic Survey Website: [http://www.anr.state.vt.us/dec/geo/chthrust.htm]

Photos of the thrust from Lone Rock Point, Burlington Vermont: [http://www.uvm.org/vtgeologicalsociety/champlainthrust.html]

References


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