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- W284642893 abstract "Thrust sheets within the Blue Ridge (BR) of northwestern NC record different Paleozoic tectonic histories, recognized on the basis of detailed field and petrographic studies. Ar-40/Ar-39, Rb-Sr, Sm-Nd, and U-Pb data are reported on mineral separates, part of an ongoing study to define the ages of Paleozoic metamorphism and deformation within various segments of the Blue Ridge. East of the Gossan Lead fault in vicinity of the Grandfather Mountain window, the BR consists mainly of amphibolite and pelitic schist. These rocks record ordovician Sm-Nd ages, Devonian Rb-Sr ages, and Mississippian Ar-40/Ar-39 ages. A Sm-Nd mineral isochron based on hornblende, plagioclase, and sphene from an amphibolite defines an age of 465 [+-] 35 Ma. Rb-Sr data from an amphibolite of similar metamorphic grade yields Devonian mineral ages ranging from 365--408 Ma. Muscovite separates in associated pelitic schists record Ar-40/Ar-39 plateau ages of 324 [+-] 1 and 329 [+-] 1 Ma. The ages are interpreted to reflect extensive Paleozoic tectonothermal activity in eastern Blue Ridge sequences, commencing with high-grade Ordovician metamorphism, isotopic resetting in the Devonian associated with granitic intrusions, followed by further re-equilibration associated with Alleghanian thrusting. In contrast, thrust sheets from the westernmost BR exhibit low metamorphic grades and recordmore » mainly Taconic ages of metamorphism. Preliminary analysis suggests that only the easternmost thrust sheets of northwestern NC experienced thermal resetting during the Devonian.« less" @default.
- W284642893 created "2016-06-24" @default.
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- W284642893 date "1992-01-01" @default.
- W284642893 modified "2023-09-26" @default.
- W284642893 title "Radiometric ages related to the timing of Paleozoic metamorphism and deformation in the Blue Ridge of northwestern North Carolina" @default.
- W284642893 hasPublicationYear "1992" @default.
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