Results 261 to 270 of about 53,167 (298)

A Re—Os isotope study of ultramafic xenoliths from the Matsoku kimberlite

Earth and Planetary Science Letters, 1997
Ultramafic xenoliths erupted within the Matsoku kimberlite pipe display a range of petrographic features that have been interpreted as the products of melt injection or infiltration and metasomatic processes. We have analysed Re and Os concentrations and the Os isotope composition of these samples with the aim of investigating how such processes affect
V. Olive, R.M. Ellam, B. Harte
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Neutron scattering from Os isotopes at 60 keV and Re-Os nucleochronology

Physical Review C, 1983
Neutron elastic and inelastic scattering cross sections have been measured for 60.5 keV neutrons incident on /sup 187,188/Os. For /sup 187/Os the cross section for elastic scattering is 11 b and for inelastic scattering to the 9.75-keV level it is 1.13 b.
R. L. Hershberger, R. L. Macklin, M. Balakrishnan, N. W. Hill, M. T. McEllistrem   +4 more
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Re-Os Isotopic Characteristics of Himalayan River Sediments and Source Rocks

Mineralogical Magazine, 1998
The 187Os/188Os ratio of the oceans has increased markedly during the Cenozoic Era, particularly during the past 15 My (Pegram et al., 1992; Peucker-Ehrenbrink et al., 1995). Some authors attribute this rise to increased weathering caused by the Himalayan collision, in analogy with similar models proposed to explain the seawater Sr isotopic record.
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Plume impingement on the Siberian SCLM: Evidence from Re–Os isotope systematics

Lithos, 2015
Abstract We report Re–Os and platinum group element (PGE) systematics for a suite of 16 mantle peridotites from the Udachnaya (360 Ma) and Obnazhennaya (160 Ma) kimberlite pipes, Siberia. Xenoliths from these pipes bracket the thermal climax of the Siberian plume, which is represented by the emplacement of the ~ 250 Ma Siberian Flood Basalts (SFBs ...
Pernet-Fisher, J.F., Howarth, G.H., Pearson, D.G., Woodland, S., Barry, P.H., Pokhilenko, N.P., Pokhilenko, L.N., Agashev, A.M., Taylor, L.A.   +8 more
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Propagating errors in decay equations: Examples from the ReOs isotopic system

Geochimica et Cosmochimica Acta, 1997
Abstract Statistical evaluation of radiogenic isotope data commonly makes use of the isochron method to determine closure age and initial isotopic composition which can be related to the source region from which the rocks or minerals were derived.
Malcolm Sambridge, David D. Lambert
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Origin of layered continental mantle (Karelian craton, Finland): Geochemical and Re–Os isotope constraints

Lithos, 2006
Abstract Studies of mantle xenolith and xenocryst studies have indicated that the subcontinental lithospheric mantle (SCLM) at the Karelian Craton margin (Fennoscandian Shield) is stratified into at least three distinct layers cited A, B, and C. The origin and age of this layering has, however, remained unconstrained.
Peltonen, P., Brügmann, G.
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Evolution of the Earth's Mantle: Perspective from the Re-Os Isotopic System

Mineralogical Magazine, 1994
The Re-Os isotopic system (Allegre and Luck, 1980; Faure, 1986; Shirey, 1991) has seen increasing use as a unique tracer, complementry to other radioisotope systems because of its chaleophile/siderophile behavior. Increased use has followed improvements in measurement sensitivity (Creaser et al., 1991; Vlkening et aL, 1991), analytical accuracy ...
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Radioactive Isotopes of Re, Os, and Ir

Physical Review, 1947
Leon J. Goodman, M. L. Pool
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Interpretation of geological significance of Re-Os isotopic age of bitumen

Acta Petrologica Sinica, 2022
LI Chao, SUN PengCheng, MENG HuiMing, WANG DengHong, ZHOU LiMin, LI XinWei, ZHAO Hong, QU WenJun   +7 more
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Re Os isotopic dataing of the Xiangshan deposit, East Tianshan, NW China

2010
The Xiangshan Cu-Ni deposit is located in the eastern part of the East Tianshan orogenic belt, northwestern China. Rhenium and osmium isotopic analyses of Ni-and Cu-bearing pentlandite from the deposit have been used to determine the timing of mineralization, the source of osmium, and, by inference, the source of ore metals.
Zhao, GC, Pan, CZ, Mao, QG, Li, YC, Du, AD, Qu, WJ   +5 more
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