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Evidence for Global Synchronism in Mantle Plume Convection, and Possible Significance for Geology
Nature, 1972Volume estimates and age dating of basic, non-orogenic igneous deposits suggest synchronous discharge from many hot spots, identified as mantle plumes. The discharge fluctuations seem to mirror the histories of diverse global geological parameters. Extinction crisis of faunal evolution may reflect trace-element pollution occurring during intervals of ...
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Earth-Science Reviews, 2013
Abstract The tectonic evolution of the circum-Arctic, including the northern Pacific, Siberian and North American margins, since the Jurassic has been punctuated by the opening and closing of ocean basins, the accretion of autochthonous and allochthonous terranes and associated deformation.
Grace E. Shephard +2 more
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Abstract The tectonic evolution of the circum-Arctic, including the northern Pacific, Siberian and North American margins, since the Jurassic has been punctuated by the opening and closing of ocean basins, the accretion of autochthonous and allochthonous terranes and associated deformation.
Grace E. Shephard +2 more
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2011 International Conference on Remote Sensing, Environment and Transportation Engineering, 2011
There are quite a few mantle xenoliths and one special Fe-rich melt xenolith in aegirine syenite porphyry, Liuhe, Yunnan province. Petrographic research shows that black opaque material that is Fe-rich glass, which are widely distribute reticulate along intergranular cracks of minerals, crystals fissues and cleavage in association with metasomatic ...
null Yating Chu, null Xianfan Liu
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There are quite a few mantle xenoliths and one special Fe-rich melt xenolith in aegirine syenite porphyry, Liuhe, Yunnan province. Petrographic research shows that black opaque material that is Fe-rich glass, which are widely distribute reticulate along intergranular cracks of minerals, crystals fissues and cleavage in association with metasomatic ...
null Yating Chu, null Xianfan Liu
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SEISMIC REFRACTION ANALYSIS OF WATERSHED MANTLE RELATED TO SOIL, GEOLOGY AND HYDROLOGY1
JAWRA Journal of the American Water Resources Association, 1974ABSTRACT: An extensive hammer seismic refraction survey was carried out in three contiguous watersheds (217, 89, and 190 acres) on a laccolith near Sturgis, South Dakota to test its utility in rugged mountain terrain. Isopachs (lines connecting points of equal mantle thickness), area‐elevation curves (hypsometry), and structure contours were used ...
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2013
The Wadagera kimberlite is situated near the northern bank of the Krishna River in northern Karnataka. It is the largest pipe in a cluster discovered by De Beers during exploration in 2002. The pipe has been dated at 1,083.8 ± 5.3 Ma, which corresponds to published ages of kimberlites in the adjacent Narayanpet cluster.
Michael Lynn, Sojen Joy, Robin Preston
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The Wadagera kimberlite is situated near the northern bank of the Krishna River in northern Karnataka. It is the largest pipe in a cluster discovered by De Beers during exploration in 2002. The pipe has been dated at 1,083.8 ± 5.3 Ma, which corresponds to published ages of kimberlites in the adjacent Narayanpet cluster.
Michael Lynn, Sojen Joy, Robin Preston
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2005
Surface conditions on Mars are currently cold and dry, with water ice unstable on the surface (except near the poles) and no liquid water. However, recent glacier-like landforms have been identified in the tropics and mid-latitudes of Mars, an ice-rich mantling seems to cover both hemisphere above 60°lat., and recent gullies apparently carved by liquid-
Forget, François +4 more
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Surface conditions on Mars are currently cold and dry, with water ice unstable on the surface (except near the poles) and no liquid water. However, recent glacier-like landforms have been identified in the tropics and mid-latitudes of Mars, an ice-rich mantling seems to cover both hemisphere above 60°lat., and recent gullies apparently carved by liquid-
Forget, François +4 more
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International Geology Review, 2007
Characterization of the Paleoproterozoic mantle beneath the Fennoscandian Shield: geochemistry and isotope geology (Nd, Sr) of ≈1.8 Ga mafic plutonic rocks of the Transscandinavian Igneous Belt in southeast ...
Ulf B. Andersson +4 more
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Characterization of the Paleoproterozoic mantle beneath the Fennoscandian Shield: geochemistry and isotope geology (Nd, Sr) of ≈1.8 Ga mafic plutonic rocks of the Transscandinavian Igneous Belt in southeast ...
Ulf B. Andersson +4 more
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Diamonds and the geology of Earth mantle carbon
2012Diamond can crystallize throughout the mantle below about 150 km and while it exists metastably in the crust, it is the only material sampling the ‘very deep’ mantle to depths exceeding 800 km. Diamond has been intensively studied over the last 40 years to provide extraordinary information on Earth’s deep interior.
Shirey S. B. +8 more
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Journal of the Geological Society of India, 2019
Abstract Chemical Th-U-total Pb method of dating monazite by an Electron Probe Micro Analyzer (EPMA) is a well-known technique for constraining chronology of geological events. In this communication, the analytical conditions of monazite dating using SXFive EPMA recently installed at the Department of Geology, Banaras Hindu University is
Mayuri Pandey +4 more
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Abstract Chemical Th-U-total Pb method of dating monazite by an Electron Probe Micro Analyzer (EPMA) is a well-known technique for constraining chronology of geological events. In this communication, the analytical conditions of monazite dating using SXFive EPMA recently installed at the Department of Geology, Banaras Hindu University is
Mayuri Pandey +4 more
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2018
Abstract The Diavik diamond mine includes four diamondiferous kimberlite pipes (A154N, A154S, A418, and A21) and minor kimberlite dikes that are mined by Rio Tinto and Dominion Diamond Corporation. Pipe morphologies from A154S, A154N, and A418 show similar circular near-surface expressions, with expansion of cross-sectional area and ...
S. Moss +6 more
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Abstract The Diavik diamond mine includes four diamondiferous kimberlite pipes (A154N, A154S, A418, and A21) and minor kimberlite dikes that are mined by Rio Tinto and Dominion Diamond Corporation. Pipe morphologies from A154S, A154N, and A418 show similar circular near-surface expressions, with expansion of cross-sectional area and ...
S. Moss +6 more
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