00000nam 2200000za 4500 9.859096 CaOODSP 20251031142448 cr ||||||||||| 180713s2018 oncabd ob f000 0 eng d CaOODSP eng n-cn-qu M183-2/8385E-PDF Pinet, N. The ups and downs of the Canadian Shield. 2, Preliminary results of apatite fission-track analysis from a 3.6 km vertical profile, LaRonde mine, Quebec [electronic resource] / N. Pinet. [Ottawa] : Natural Resources Canada, 2018. 43 p. : col. charts, col. ill., maps (some col.). Open file ; 8385 Includes bibliographical references (p. 20-22). "The low-temperature (120-60°C) thermal history of eight samples from a 3.6 km vertical depth profile in the LaRonde Mine (Archean Abitibi greenstone belt, Quebec) has been investigated using apatite fission-track (AFT) analysis. All samples correspond to greywackes of the Cadillac Formation. The AFT ages show a clear younging relationship with depth (increasing temperature), as expected for samples that maintained constant relative depths over time. Ages vary from 413 ± 51 Ma near the surface, to 148.5 ± 6.3 Ma for the deepest sample. Forward and inverse modeling indicate that a scenario with a constant temperature or minor heating during the Paleozoic better accounts for the fission track length distributions than a scenario with a constant cooling rate. These results support the possibility that the Abitibi region was covered by a sedimentary succession of moderate thickness during the Paleozoic"--Abstract, p. 2. Shields (Geology) Fission track dating Québec (Province) Canada. Natural Resources Canada. Geological Survey of Canada. Open file (Geological Survey of Canada) 8385. (CaOODSP)9.506878 PDF 6.70 MB https://publications.gc.ca/collections/collection_2018/rncan-nrcan/m183-2/M183-2-8385-eng.pdf 308067