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Now showing items 1-20 of 235
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(1997)Five of six samples representing the entire stratigraphic sequence (∼3700 m thick) of basaltic flows in the Noril'sk section in the northwestern part of Siberian flood basalt province, Russia yield 40Ar–39Ar plateau ages ...
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(2006)Mississippi Valley type galena deposits emplaced into Carboniferous limestones throughout the Mendip Hills during the late Permian or Triassic period were locally exposed to the action of seawater during the Jurassic period ...
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(1996)Establishing an accurate and precise age for Siberian flood-basalt volcanism is of great importance in evaluating causes for the unequaled mass extinction of flora and fauna at the Permian-Triassic boundary. We report a ...
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(2003)A new Sinokannemeyeriine species, Rhadiodromus mariae, is described. This species occurs only in the upper horizon of the Donguz Formation, while R. klimovi is confined to beds with sandy lenses at the bottom of the upper ...
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(2006)Recent geochemical studies of volcanic rocks forming part of the ophiolites within the Zagros and Naien-Baft orogen indicate that most of them were developed as supra-subduction ophiolites in intra-oceanic island arc ...
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(1995)age spectra of biotite from a mineralized vein in the ore-bearing, Noril'sk I intrusion and from picritic-like gabbrodolerite from the weakly mineralized, Lower Talnakh intrusion show that these bodies were emplaced at 249 ...
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(1996)A stable isotope study of 168 plutonic igneous rock and five water samples from Transbaikalia, East Asia, has been made, including 318 whole-rock and mineral 18O/16O analyses and 14 D/H analyses. This represents the first ...
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(2006)Previous studies have suggested a variety of causes for the end-Permian extinction event including a bolide impact, flood basalt volcanism, methane clathrate dissociation, or some combination of catastrophic processes. One ...
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(2005)Helium concentration and isotopic composition were measured in a suite of samples across the Permian–Triassic boundary at Opal Creek, Canada, to determine whether high extraterrestrial helium concentrations are associated ...
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(2006)The Jianfengling composite batholith is chiefly composed of the Jianfengling superunit with medium-coarse grained porphyritic, fine-grained porphyritic, coarse-medium grained and fine-grained biotite syenogranites. These ...
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(2002)The Permian–Triassic (P–T) mass extinction, the greatest biological mortality event in the Earth’s history, was probably caused by dramatic and global forcing mechanisms such as the Siberian flood volcanism. Here we present ...
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(1989)In one area of Yakutia there is a kimberlite pipe that is truncated by a thick (about 100 m) Permo-Triassic dolerite sill and other, smaller bodies of the traprock association. At the contact with the dolerite sill, the ...
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(2001)The central Himalayas and the Salt Range are type areas of the lower and upper Induan substages, respectively. The lower Induan Substage spans the interval of Otoceras and Ophiceras beds. The Otoceras Beds in the range of ...
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(2006)East Greenland is a classical area for the study of the Permianearliest Triassic H.trivialeTriassic boundary. The new ammonoid data indicate that deposition was continuous across the Permianmudstone contact in basinal areas ...
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(2004)Taxonomic diversity is only one possible biodiversity metric. Studies of taxonomic and morphologic diversity indicate that the two need not be closely linked. Mass extinctions, and their associated recovery periods, can ...
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(2006)A recently discovered Late Triassic (Lower Camian) coleoid (Doguzhaeva & al., 2005a) from the Austrian Alps (locality Schindelberg, Lunz, Niederösterreich) is described as Lunzoteuthis schindelbergensis n. gen. et sp. The ...
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(1987)The meteorite crater is isometric, with some angularity. The highest evaluation of its rim is 755 m in the south and 712 m in the north. The maximum evaluation of the rim above the crater floor is 305 m. The width of the ...
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(2006)Twenty-six groundwater samples were collected from the Eastern Thessaly region and analysed by ICP-ES for these elements: Al, As, P, Pb, Zn, Mn, Fe, Cr, Sb, Cu, Na, Br, Cl, Si, Mg, Ag, Be, Bi, Dy, Er, Eu, Au, Ge, Ho, In, ...
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(2004)Accelerated biotic turnover during the Late Triassic has led to the perception of an end-Triassic mass extinction event, now regarded as one of the ‘‘big five’’ extinctions. Close examination of the fossil record reveals ...
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(1988)The Siberian craton abounds with traps of different facies, and may be regarded in this respect as a standard. Permian-Triassic traps are most common here, so we primarily use them to characterize the volcanisms of the ...
Now showing items 1-20 of 235