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Showing 1 to 17 of 17 for “"flood basalts"”.
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The Origin and Petrogenesis of the Ethiopian Flood Basalts
… plume source responsible for a major continental flood basalt event and the manner in which it interacted with the lithosphere over the course of continental separation. The flood basalts of the Ethiopian Plateau constitute the larger part of this province and are associated with melting in the …
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Stratigraphy and petrogenesis of the Parana continental flood basalts, southern Brazil
… the largest preserved example of a continental flood basalt (CFB) province, with a present area in excess of 1.2 x 10<sup>6</sup> km<sup>2</sup>. Magmatism is dominated by tholeiitic basalts (> 90 %), with minor rhyolites as a late-stage feature along the continental margin. The basaltic magmas …
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Crustal contamination recorded by zoned plagioclase in primitive Karoo flood basalts, Luenha River, Mozambique
Jurakautinen (182 Ma) Karoon laakiobasalttiprovinssi on geokemialtaan erittäin heterogeeninen. Heterogeenisyyden on ajateltu olevan peräisin kahdesta toisistaan eriävästä vaippalähteestä. Mozambikin koillisosassa sijaitseva Luenha joen paljastuma sisältää primitiivistä pikriittejä, …
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Predicted and observed free-air gravity anomalies for delamination models of the formation of the Siberian Flood Basalts
… responsible for the formation of the Siberian Flood Basalts (SFB) has yet to be discovered and adequately quantified. One theory proposes that thinning of the lithosphere due to delamination triggered the eruption. This model is characterized by a drip of denser material within the mantle, and …
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Petrological and rheological controls on volcanism to terrestrial planets
… including delamination under the Siberian flood basalts (Chapter 2), gravitational instabilities in the lunar magma ocean cumulates (Chapter 7), and thinning and convection due to giant meteorite impacts (Chapters 3 and 8), has lead to new models for melt production. These studies together …
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Sources of suspended load in the upper Orange River, South Africa
… sedimentary rocks of the Karoo Supergroup and flood basalts of the Drakensberg Group each with distinct geochemical signatures.
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Geochemistry of dolerites from the Parana flood basalt province, southern Brazil
The Cretaceous Parana-Etendeka flood basalt magmatism of South America and " Africa was accompanied by intense intrusive activity. This study examines the geochemistry and petrogenesis of dykes from two regions of southern Brazil. Dykes from the Ponta Grossa region of Parana. State fed the basalt …
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Lateritic palaeosols of N.E. Africa: a remote sensing study
… Africa. They immediately pre-date midOligocene flood basalts and, if mapped, can be used to delineate a flood basalt-Iaterite contact and define the pre-30 Ma African Surface and uplift patterns. They have important engineering properties and are key to understanding basement alteration and its …
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Implications of Permeability Uncertainty During Three-phase CO2 Flow in a Basalt Fracture Network
Recent studies suggest that continental flood basalts may be suitable for geologic carbon sequestration due to fluid-rock reactions that mineralize injected CO₂ on relatively short time-scales. Flood basalts also possess a permeability structure favorable for injection, with alternating …
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Intraplate Volcanism in our Solar System; Searching for Terrestrial Analogues for the Moon and Mars
… the Deccan Volcanic Province and Columbia River Flood Basalts, and through orbital and lander missions, flood lavas have also been identified on the Moon and Mars. These remote observations were also confirmed by lunar field observations and samples taken during the Apollo and Luna missions and …
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High-Fidelity Gravity Modeling Applied to Spacecraft Trajectories and Lunar Interior Analysis
… for understanding the emplacement of the mare flood basalts, open lava tubes are of interest as possible habitation sites safe from cosmic radiation and micrometeorite impacts. Tools are developed to best exploit the rich gravity data toward the numerical detection of such small features.
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Evolution of a Flood Basalt Crustal Magmatic System: In Situ Mineral Data and Computational Modeling of the Steens Basalt
Flood basalts are gigantic basaltic eruptions that modify the mass of the crust via intrusion of mantle-derived magma, and change its composition through interaction between magma and crust. The Steens Basalt, located in southeast Oregon, erupted approximately 16.8 million years ago, and is the …
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Documenting Mantle and Crustal Contributions to Flood Basalt Magmatism via Computational Modeling of the Steens Basalt, Southeast Oregon
Flood basalts are enormous volcanic events with volumes of volcanic cover and intrusive equivalents that are affected by and significantly affect the crust. Steens Basalt represents 31,800 km<sup>3</sup> of flood basalt lavas that erupted in eastern Oregon ~16.8 Ma in less than 300,000 years. …
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Palaeoenvironmental change from the Hettangian to Toarcian in Moyeni (Quthing District), southwestern Lesotho
… the outpouring of the Karoo continental flood basalts. The study area at Moyeni in SW Lesotho, exposes the richly fossiliferous Lower Jurassic upper Elliot and Clarens Formations (Stormberg Group) as well as the Barkly East Formation (lowermost Drakensberg Group). With the aid of …
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Tertiary and carboniferous magmatism around Lundy Island and the outer Bristol Channel - a geophysical and geochemical perspective
… with both large volumes of continental flood basalts and regional dyke swarms. The Lundy Island is the southern most expression of Tertiary volcanism and consists of granite intruded by around 200 dykes and associated with positive gravity and magnetic anomalies. The Lundy Dyke Swarm …
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Karoo-Etendeka Unconformities in NW Namibia and their Tectonic Implications
… crustal doming associated with Etendeka flood volcanism. The enhanced tectonism during the Early Cretaceous controlled accommodation space for the alluvial-fluvial and aeolian deposits of the lower Etendeka Group. Disconformities within those deposits and the overlying lava succession …
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The Role of Cumulate Plagioclase Entrainment in the Steens Basalt, SE Oregon: Insights from the Magma Chamber Simulator
… and abundant plagioclase are found in other flood basalt provinces worldwide, these results could also enhance understanding of magma evolution and storage conditions for GPB worldwide. The Steens basalt is informally subdivided into upper Steens and lower Steens based on geochemical …