Detrital zircon U-Pb geochronology and Hf isotope geochemistry of Labrador and Curling group strata, Humber zone, Newfoundland Appalachians ...

• Main Author: Soukup, Maya Anna
• Format: Text
• Language: English
• Published: Memorial University of Newfoundland 2023
• Subjects: Newfoundland
• Online Access: https://dx.doi.org/10.48336/hptv-cg96; https://research.library.mun.ca/15840/

The Humber zone of the western Newfoundland Appalachians formed during the protracted (200 Myr) breakup of the supercontinent Rodinia and the opening of the Iapetus Ocean along NE Laurentia (ancestral North America). Deep-marine strata of the Humber Arm allochthon (Curling Group) and shallow-marine strata of the parautochthonous Humber platform (Labrador Group) record changes in Ediacaran to Cambrian paleogeography and sediment dispersal in NE Laurentia during and after breakup. While ion-microprobe-based detrital zircon U-Pb age results exist for some these rock units, recent advancements in high-n, laser ablation microanalytical techniques allow for more robust assessment of their provenance and new constraints on the geology of the rift-drift transition, relationships between coeval syn- and post-rift shelf and slope strata, and types of continental rift mechanisms in western Newfoundland. New high-n detrital zircon U-Pb (~300 analyses per sample) and Hf (~50 analyses per sample) isotope results from 11 ...