8 research outputs found
Landslides Zonation Hazard: relation between geological structures and landslides occurrence in hilly tropical regions of Brazil
Insight into the structure and chemistry of glandular trichomes of Labiatae, with emphasis on subfamily Lamioideae
Probabilistic seismic hazard analysis for a nuclear power plant site in southeast Brazil
Drainage morphometry of the Lishui catchment in the middle Yangtze basin, China: morphologic and tectonic implications
Comparison of novelty detection methods for multispectral images in rover-based planetary exploration missions
Fission-Track Thermochronology Applied to the Evolution of Passive Continental Margins
International audiencePassive continental margins (PCMs) form at divergent plate boundaries in response to continental breakup and subsequent formation of new oceanic basins. The onshore topography of PCMs is a key component to understand the evolution of extensional settings. The classic nomenclature of PCMs is derived from early investigations that suggested apparent tectonic stability after the initial phase of rifting and breakup. However, geological and geomorphic diversity of PCMs requires more complex models of rift and post-rift evolution. Fission-track (FT) thermochronology provides appropriate tools to decipher the long-term development of PCM topography and better resolve the spatial and temporal relationships between continental erosion and sediment accumulation in adjacent offshore basins. FT datasets have revealed complex spatial and temporal denudation histories across some PCMs and have shown that several kilometres of material may be removed from the onshore margin following rifting. Combining these data with geological and geomorphological observations, and with predictions from numerical modelling, suggests that PCMs may have experienced significant post-rift activity. Case histories illustrated in this chapter include the PCM of southeastern Africa and the conjugate PCMs of the North and South Atlantic