32 documents found, page 1 of 4
Physicochemical Properties of Fe-Bearing Phases from Commercial Colombian Coal Ash
Santos, Ana Cláudia; Cruz, Cláudia; Font, Eric; French, David; Guedes, Alexandra; Moreira, Karen; Sant'Ovaia, Helena; Vieira, Bruno J. C.High amounts of coal combustion products, such as fly ash and bottom ash, are generated every year; however, only 64% are used, which means that a significant part is landfilled despite containing valuable materials such as ferrospheres, which may be used as catalysts, substituting critical raw materials (e.g., platinoids). In commercial coals, pyrite contents are reduced as a pre-combustion S-emissions control...
Mercury anomaly, Deccan volcanism, and the end-Cretaceous mass extinction
Font, Eric; Adatte, Thierry; Sial, Alcides Nobrega; Lacerda, Luiz Drude de; Keller, Gerta; Punekar, JahnaviThe contribution of the Deccan Traps (west-central India) volcanism in the CretaceousPaleogene (KPg) crisis is still a matter of debate. Recent U-Pb dating of zircons interbedded within the Deccan lava flows indicate that the main eruptive phase (>1.1 × 106 km3 of basalts) initiated ~250 k.y. before and ended ~500 k.y. after the KPg boundary. However, the global geochemical effects of Deccan volcanism in the ma...
Rapid light carbon releases and increased aridity linked to Karoo-Ferrar magmat...
Font, Eric; Duarte, Luís Vítor; Dekkers, Mark J.; Remazeilles, Celine; Egli, Ramon; Spangenberg, Jorge E.; Fantasia, Alicia; Ribeiro, Joana; Gomes, ElsaLarge-scale release of isotopically light carbon is responsible for the carbon isotope excursion (CIE) of the Toarcian Oceanic Anoxic Event during the Lower Jurassic. Proposed sources include methane hydrate dissociation, volcanogenic outgassing of carbon dioxide and/or thermogenic methane release from the Karoo-Ferrar magmatic province (southern Africa). Distinct small-scale shifts superimposed on the long-ter...
The Lowermost Tejo River Terrace at Foz do Enxarrique, Portugal: A Palaeoenviro...
Cunha, Pedro P.; Martins, António; Buylaert, Jan-Pieter; Murray, Andrew S.; Gouveia, Maria P.; Font, Eric; Pereira, Telmo; Figueiredo, SilvérioReconstruction of Pleistocene environments and processes in the sensitive geographical location of westernmost Iberia, facing the North Atlantic Ocean, is crucial for understanding impacts on early human communities. We provide a characterization of the lowest terrace (T6) of the Lower Tejo River, at Vila Velha de Ródão (eastern central Portugal). This terrace comprises a lower gravel bed and an upper division ...
Deccan volcanism induced high-stress environment during the Cretaceous–Paleogen...
Font, Eric; Adatte, Thierry; Andrade, Mariana; Keller, Gerta; Mbabi Bitchong, André; Carvallo, Claire; Ferreira, Joana; Diogo, Zenaida; Mirão, JoséWe conducted detailed rock magnetic, mineralogical and geochemical (mercury) analyses spanning the Cretaceous–Paleogene boundary (KPB) at Zumaia, Spain, to unravel the signature of Deccan-induced climate and environmental changes in the marine sedimentary record. Our biostratigraphic results show that Zumaia is not complete, and lacks the typical boundary clay, zone P0 and the base of zone P1a(1) in the basal D...
The Alpine Orogeny in the West and Southwest Iberia Margins.
Terrinha, Pedro; Ramos, Adrià; Neres, Marta; Valadares, Vasco; Duarte, João; Martinez-Loriente, Sara; Silva, Sónia; Mata, João; Kullberg, José CarlosThe Alpine orogeny is well recorded onshore and offshore by tectonic inversion of the Mesozoic rift basins. Large scale linear seamounts (more than 250 km long and with up to 5 km of uplift) involving oceanic and continental lithosphere were carried on top of thrusts, such as the Gorringe seamount and the Estremadura Spur in the SouthWest and West Iberia Margin, respectively. The SouthWest Iberia Margin also re...
The lowermost Tejo River terrace at Foz do Enxarrique, Portugal: a palaeoenviro...
Cunha, Pedro; Martins, António; Buylaert, Jan-Pieter; Murray, Andrew S.; Gouveia, Maria; Font, Eric; Pereira, Telmo; Figueiredo, SilvérioAbstract: Reconstruction of Pleistocene environments and processes in the sensitive geographical location of westernmost Iberia, facing the North Atlantic Ocean, is crucial for understanding impacts on early human communities. We provide a characterization of the lowest terrace (T6) of the Lower Tejo River, at Vila Velha de Ródão (eastern central Portugal). This terrace comprises a lower gravel bed and an upper...
The Lowermost Tejo River Terrace at Foz do Enxarrique, Portugal: A Palaeoenviro...
Cunha, Pedro P.; Martins, António; Buylaert, Jan-Pieter; Murray, Andrew; Gouveia, Maria; Font, Eric; Pereira, Telmo; Figueiredo, SilvérioReconstruction of Pleistocene environments and processes in the sensitive geographical location of westernmost Iberia, facing the North Atlantic Ocean, is crucial for understanding impacts on early human communities. We provide a characterization of the lowest terrace (T6) of the Lower Tejo River, at Vila Velha de Ródão (eastern central Portugal). This terrace comprises a lower gravel bed and an upper division ...
The lowermost Tejo River terrace at Foz do Enxarrique, Portugal: a palaeoenviro...
Cunha, Pedro; Martins, António; Buylaert, Jan-Pieter; Murray, Andrew; Gouveia, Maria; Font, Eric; Pereira, Telmo; Figueiredo, SilvérioReconstruction of Pleistocene environments and processes in the sensitive geographical location of westernmost Iberia, facing the North Atlantic Ocean, is crucial for understanding impacts on early human communities. We provide a characterization of the lowest terrace (T6) of the Lower Tejo River, at Vila Velha de Rodao (eastern central Portugal). This terrace comprises a lower gravel bed and an upper division ...
Non-halide sediments from the Loule diapir salt mine: characterization and envi...
Ribeiro, Carlos; Terrinha, Pedro; Andrade, Alexandre; Fonseca, Bruno; Caetano, Miguel; Neres, Marta; Font, Eric; Mirão, José; Dias, CristinaThe sedimentary record of the Mesozoic Algarve Basin (south Portugal) spans from the Triassic to the Lower Cretaceous. Following the initial phase of Pangaea breakup and the related continental sedimentation during the Triassic, the sedimentation evolved through transitional (Triassic-Jurassic transition) to marine (Jurassic) environments. During the Hettangian a thick sequence of evaporites deposited in the ba...