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Showing 1 to 16 of 16 for “"Large igneous province"”.
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Carbonatites as a record of the carbon isotope composition of large igneous province outgassing
<p>Large igneous province (LIP) eruptions have been linked in some cases to major perturbations of Earth’s carbon cycle. However, few observations directly constrain the isotopic composition of carbon released by LIP magmas because carbon isotopes fractionate during degassing, which hampers …
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An isotope study of the felsic units of the Bushveld Large Igneous Province, South Africa
An O, H, Sr and Nd isotope study was carried out on the ~ 2059 Ma Bushveld granites and granophyres. A small number of Rooiberg Group felsites were also studied.
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The Evolution of the Galapagos Mantle Plume: From Large Igneous Province to Ocean Island Basalt
… As plumes rise they may form volumetrically large "heads" (~1000 km in diameter) with narrower (~100 km) "tails." Plume head melting is thought to form Large Igneous Provinces (LIPs), vast outpourings of basaltic lava (~106 km3), while plume tail melting forms linear chains of ocean island …
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Volatiles as a link between planetary interiors and the environment
… released during emplacement of the Siberian large igneous province. In an extreme variation on terrestrial volatile cycling, I also explore the erosional history of Titan as recorded in valley networks carved by rivers of liquid hydrocarbons.
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A multi-technique provenance study of the Oligocene : recent Nile cone sediments and River Nile hinterland
… of basic detritus from the Cenozoic Ethiopian Large Igneous Province. Detrital zircon signatures are dominated by variations in bedrock lithology, and the availability of easily-eroded Phanerozoic cover sediments. These represent an important source of detritus to the river and are …
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Geochemical, Isotopic, and Mineralogical Characterization of the Frobisher Suite Mafic-Ultramafic Sills, Southern Baffin Island, Nunavut, with Implications for Metallogenic Potential
… Frobisher Suite is a newly recognized magmatic province comprised of mafic-ultramafic sills in southern Baffin Island, Nunavut. The sills are emplaced into the metasedimentary strata of the middle Paleoproterozoic Lake Harbour Group, and vary in thickness from several meters to hundreds of …
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Supercontinental Inheritance and its Influence on Supercontinental Breakup: The Central Atlantic Magmatic Province and the Breakup of Pangea
The Central Atlantic Magmatic Province (CAMP) is the large igneous province (LIP) that coincides with the breakup of the supercontinent Pangea. Major and trace element data, Sr-Nd-Pb radiogenic isotopes, and high-precision olivine chemistry were collected on primitive CAMP dikes from Virginia (VA). …
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Geochemical investigations of the late early Cambrian extinctions
… carbon cycle. The emplacement of the Kalkarindji Large Igneous Province (LIP) in Australia is hypothesized to have caused the extinctions and driven the carbon cycle perturbations represented by the CIEs. However, uncertainties in radiometric dating of the LIP and the regional variations of the …
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Geochemistry of mafic dikes from the Coastal New England magmatic province in southeast Maine, USA and Nova Scotia, Canada
… Known as the Coastal New England (CNE) magmatic province, this dike swarm is the immediate magmatic predecessor to the formation of the Central Atlantic Magmatic Province large igneous province at 201 Ma and the breakup of Pangea. The intent of this study is to determine the melt source and …
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The Aptian-Albian ironstone of the Rapid Creek formation, Little Fish Creek, NWT: implications for Cretaceous Ocean Anoxic Events and critical mineral deposits
… and weathering mafic rocks of the High Arctic Large Igneous Province (HALIP) under a greenhouse climate may have been important for producing anoxic seawater enriched in Fe and Mn to the Blow Trough. Such an interpretation implies that the Aptian-Albian Oceanic Anoxic Event (OAE) 1b may have …
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Biogeochemical Cycling and Paleoenvironmental Reconstructions of the Toarcian Oceanic Anoxic Event from Western North America
… when the emplacement of the Karoo-Ferrar Large Igneous Province (LIP) is thought to have resulted in significant environmental change. Associated with this interval was the widespread deposition of organic-rich sediments, carbon cycle and seawater chemistry changes, global warming, the …
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Evaluating redox cycling across the Toarcian Oceanic Anoxic Event with implications for paleo-environmental reconstructions and organic matter sulfurization
… of volcanism associated with the Karoo-Ferrar Large Igneous Province and an interval of heightened marine invertebrate extinction. Ultimately, our data support a greater temporal extent of anoxic conditions around the T-OAE, which support the greater sensitivity of marine oxygen levels to …
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Recalibrating the breakup history of SW Gondwana: the first U-Pb chronostratigraphy for the Uitenhage Group, South Africa
… during the emplacement of the Karoo and Ferrar Large Igneous Province in the Early Jurassic (Pliensbachian) and likely predates the main phase of rifting in the southern Cape, whereas the Uitenhage Group was deposited over a prolonged (> 40 Ma) period from the Early Jurassic into the Early …
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Investigating Palaeoatmospheric Composition-Climate Interactions
… The eruption of Mount Samalas in 1257 led to the largest stratospheric volcanic injection of aerosol precursor gases in the Common Era, however climate model simulations of the last millennium typically overestimate the resulting climatic cooling when compared with tree-ring proxy records. A novel …
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Moving hotspots
… affects the buoyancy of the plume. A plume with larger radius rises faster through the mantle, and will hence have a stronger tendency to straighten up. In contrast, a plume with smaller radius rises slowly and will be influenced more strongly by the velocity field of the mantle. Allowing for the …