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Potassium–Argon Dating of Blueschists from Pinchi Lake, Central British Columbia

1974; NRC Research Press; Volume: 11; Issue: 7 Linguagem: Inglês

10.1139/e74-097

1480-3313

I. A. Paterson, J. E. Harakal,

Geology and Paleoclimatology Research

Geologic and radiometric evidence demonstrates that the Pinchi Lake blueschists underwent an early deformation, blueschist metamorphism, uplift, cooling, and a second deformation during the Triassic Tahltanian orogeny. Potassium–argon dates on phengitic muscovites from the blueschists (211, 214, 216, 218 ± 7 my) are considered to mark the close of the second deformation which was contemporaneous with or immediately after uplift and cooling of the blueschists during the Late Triassic.