Results 151 to 160 of about 11,994 (188)

Crustal influence in the generation of continental flood basalts

Nature, 1981
The suggestion that primordial undifferentiated material may exist in the earth's mantle has recently been revived on the strength of Nd isotope data for two types of young continental rocks - flood basalts and kimberlites. The limited published data show a clustering of Nd isotopic compositions close to those for meteorites with chondritic relative ...
R. W. Carlson, G. W. Lugmair, J. D. Macdougall   +2 more
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Emplacement of Continental Flood Basalt Lava Flows

2013
We propose that continental flood basalt (CFB) lavas were predominantly emplaced as inflated compound pahoehoe flow fields via prolonged, episodic eruptions. Our most detailed observations come from the ∼14,7 Ma Roza flow field of the Columbia River Basalt (CRB) Group. The Roza flow field seems to be typical of many flood basalt lavas. Individual flows
Stephen Self, Thorvaldur Thordarson, Laszlo Keszthelyi   +2 more
openaire   +1 more source

Continental tholeiitic flood basalt provinces

2007
Large areas of the continents appear to have been covered by vast thicknesses of laterally extensive basaltic lava flows at various stages during the past 1000 Ma, apparently fed from fissures rather than central vent volcanoes. These are referred to as continental flood basalt provinces or CFBs.
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Continental Flood Basalt Provinces

2001
Since the start of the Mesozoic Era about 230 million years ago, large volumes of tholeiite basalt have been erupted through fissures on all of the continents. In several cases, the extrusion of these lavas occurred in conjunction with the break-up of the supercontinents of Gondwana and Pangea.
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Basalt geochemistry and tectonic discrimination within continental flood basalt provinces

Journal of Volcanology and Geothermal Research, 1987
Abstract Continental flood basalts are usually regarded as a single tectonomagmatic entity but frequently quoted examples exhibit a variety of tectonic settings. In one well-studied, classic, flood basalt province, the Mesozoic Karoo province of southern Africa, magmatism occurred in the following tectonic settings: (a) continental rifting leading to
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Emplacement mechanisms for Continental Flood Basalts and implications for plume activity during incipient continental breakup

Journal of African Earth Sciences, 2007
We use model experiments to address the dynamics of magma upwelling during incipient break up of the continental lithosphere. In particular we study the emplacement mechanisms responsible for formation of Continental Flood Basalts. The models show that the dynamics of melt upwelling and distribution and the surface topography are all sensitive to the ...
Mulugeta, G., Abebe, B., Korme, T., Sokoutis, D.   +3 more
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Continental Flood Basalts

1988
The Columbia River Basalt.- Flood Basalt Volcanism in the Northwestern United States.- The Ethiopian Flood Basalt Province.- The North Atlantic Tertiary Province.- Deccan Traps.- Continental Flood Volcanism From the Parana Basin (Brazil).- The Karoo Province.- Traps of the Siberian Platform.- Cenozoic Basaltic Rocks in Eastern China.- Continental Flood
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Continental flood basalts sample oxidized mantle sources

Lithos
Large igneous provinces (LIP) are vast (0.2 to >1 Mkm3) outpourings of basaltic lava and voluminous intrusions of magmas that have had important environmental consequences, in many cases leading to immense greenhouse gas release and mass extinctions. Magmatic oxygen fugacity (fO2) influences the chemistry of volcanic gases and is an important parameter
Nicklas, R., Day, J., Trumbull, R., Rangwalla, H., Kelly, S.   +4 more
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Continental flood basalts: episodic magmatism above long-lived hotspots

Earth and Planetary Science Letters, 2000
Abstract The eruption of continental flood basalt (CFB) may reflect episodic magmatism above long-lived mantle plumes. The Iceland and Yellowstone hotspots have generated successive CFB provinces, large intrusive complexes, anomalous uplift, basin formation, and rifting events, and linear volcanic chains dating back >120 and >70 Ma, respectively ...
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Coats Land dolerites and the generation of Antarctic continental flood basalts

Geological Society, London, Special Publications, 1992
Abstract On the basis of geochemical signatures, Mesozoic magmatism in Antarctica is divided into the Ferrar Magmatic Province and the Dronning Maud Land Province. The tholeiitic magmatism of the Ferrar Magmatic Province is distinguished by such features as low Ti/Y (< 200) and Zr/Y (< 5.0) ratios, negative εNd values (<
Brewer, T.S., Hergt, J.M., Hawkesworth, C.J., Rex, D., Storey, B.C.   +4 more
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