McDonough, Michael R, McNicoll, Vicki J, Schetselaar, Ernst M, Grover, Timothy W (2000) Geochronological and kinematic constraints on crustal shortening and escape in a two-sided oblique-slip collisional and magmatic orogen, Paleoproterozoic Taltson magmatic zone, northeastern Alberta. Canadian Journal of Earth Sciences, 37 (11) 1549-1573 doi:10.1139/e00-089
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Geochronological and kinematic constraints on crustal shortening and escape in a two-sided oblique-slip collisional and magmatic orogen, Paleoproterozoic Taltson magmatic zone, northeastern Alberta | ||
| Journal | Canadian Journal of Earth Sciences | ||
| Authors | McDonough, Michael R | Author | |
| McNicoll, Vicki J | Author | ||
| Schetselaar, Ernst M | Author | ||
| Grover, Timothy W | Author | ||
| Year | 2000 (November 1) | Volume | 37 |
| Issue | 11 | ||
| Publisher | Canadian Science Publishing | ||
| DOI | doi:10.1139/e00-089Search in ResearchGate | ||
| Generate Citation Formats | |||
| Mindat Ref. ID | 483323 | Long-form Identifier | mindat:1:5:483323:3 |
| GUID | 0 | ||
| Full Reference | McDonough, Michael R, McNicoll, Vicki J, Schetselaar, Ernst M, Grover, Timothy W (2000) Geochronological and kinematic constraints on crustal shortening and escape in a two-sided oblique-slip collisional and magmatic orogen, Paleoproterozoic Taltson magmatic zone, northeastern Alberta. Canadian Journal of Earth Sciences, 37 (11) 1549-1573 doi:10.1139/e00-089 | ||
| Plain Text | McDonough, Michael R, McNicoll, Vicki J, Schetselaar, Ernst M, Grover, Timothy W (2000) Geochronological and kinematic constraints on crustal shortening and escape in a two-sided oblique-slip collisional and magmatic orogen, Paleoproterozoic Taltson magmatic zone, northeastern Alberta. Canadian Journal of Earth Sciences, 37 (11) 1549-1573 doi:10.1139/e00-089 | ||
| In | (2000, November) Canadian Journal of Earth Sciences Vol. 37 (11) Canadian Science Publishing | ||
| Abstract/Notes | The southern Taltson magmatic zone (south of 60°N) is a composite continental magmatic arc and collisional orogen resulting from the convergence of the Buffalo Head terrane with the Archean Churchill craton. Taltson basement (ca. 3.23.0 Ga and 2.42.14 Ga) and Rutledge River supracrustal gneisses (2.132.09 Ga) were intruded by voluminous I- and S-type magmatic rocks between 1.99 and 1.92 Ga. Taltson magmatic zone was deformed by three ductile shear zones: Leland Lakes, Charles Lake, and Andrew Lake, exhibiting both strike- and dip-lineated mylonitic domains. Kinematic data for shear zones are reported at microscopic, mesoscopic, and macroscopic (remotely sensed data) scale. We present field and UPb isotopic data (zircon and monazite) for magmatic and metamorphic rocks that constrain the timing of granulite to upper amphibolite-grade shearing in the Leland Lakes and Charles Lake (formerly Allan) shear zones to ca. 19381934 Ma. Foreland (easterly) vergent thrusting on the Andrew Lake shear zone is ca. 1932 Ma. Taltson shear zones were overprinted by widespread amphibolite- to greenschist-grade shearing, which is constrained by published 40Ar39Ar and KAr dates on hornblende and muscovite to between ca. 1900 and 1800 Ma. We propose a crustal architecture, resembling a crustal-scale asymmetric flower structure, in which the Charles Lakes shear zone formed the fundamental shear zone of a middle to lower crustal sinistral transpression system that accommodated southward escape of crust in the upper plate of an oblique continental subductioncollision zone, with shortening partitioned into synchronous outwardly vergent thrust systems to the east and west of the main shear zone. | ||
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