étiquettes: physical sciences, geology, paleoenvironment, erosion, geological history
chercheur principal: | Macdonald, Francis A (1) |
Nᵒ de permis: | 16564 |
Organisation: | University of California at Santa Barbara |
Année(s) de permis: |
2019
|
Délivré: | juin 17, 2019 |
Équipe de projet: | Becky Flowers, Paul Hoffman |
Objectif(s): To constrain the timing, magnitude, and spatial heterogeneity of erosion that lead to development of the Great Unconformity.
Description du projet: This proposal aims to constrain the timing, magnitude, and spatial heterogeneity of erosion that lead to development of the Great Unconformity (GU) to test hypotheses for oxygenation and the Cambrian explosion. The GU is one of the most geologically significant and largest temporal gaps in the rock record, marking the boundary between Precambrian and Phanerozoic time. It has been proposed that erosion below the GU delivered bio-limiting phosphorous to the ocean, which spurred organic carbon burial, oxygenation of the ocean-atmosphere system, and the rise of animals. Determining when the GU developed, whether during Rodinia mantle upwelling, early Rodinia breakup, the Cryogenian Snowball Earth glaciations, or Late Ediacaran rifting, and deciphering the size of the last erosion event preceding GU formation, whether km’s or 100s of m, are critical for identifying viable mechanisms for evolutionary change during this pivotal... Plus de résultats