Results 101 to 110 of about 19,693 (231)

N-body simulations of oligarchic growth of Mars: Implications for Hf-W chronology

, 2013
Dauphas and Pourmand (2011) [Nature 473, 489--492] estimated the accretion timescale of Mars to be 1.8 $^{+0.9}_{-1.0}$ Myr from the W isotopes of martian meteorites.
Golabek, Gregor, Morishima, Ryuji, Samuel, Henri   +2 more
core   +1 more source

Lead isotope constraints on the mantle sources involved in the genesis of Mesozoic high-Ti tholeiite dykes (Urubici type) from the São Francisco Craton (Southern Espinhaço, Brazil)

Brazilian Journal of Geology
: The first results of Pb isotope compositions of the high-Ti Mesozoic dykes of the Southern Espinhaço are presented. The results do not show large variations and are significantly more radiogenic than the Pb isotope compositions of the high-Ti ...
Leila Soares Marques, Eduardo Reis Viana Rocha-Júnior, Marly Babinski, Karine Zuccolan Carvas, Liliane Aparecida Petronilho, Angelo De Min   +5 more
doaj   +1 more source

Dust Transport to the Taylor Glacier, Antarctica, During the Last Interglacial

Geophysical Research Letters, 2019
Changes in the composition of dust trapped in ice provide evidence of past atmospheric circulation and earth surface conditions. Investigations of dust provenance in Antarctic ice during glacial and interglacial periods indicate that South America is the
S. M. Aarons, S. M. Aciego, J. R. McConnell, B. Delmonte, G. Baccolo   +4 more
doaj   +1 more source

Marine Strontium Isotope Evolution at the Triassic‐Jurassic Transition Links Transient Changes in Continental Weathering to Volcanism of the Central Atlantic Magmatic Province

Geochemistry, Geophysics, Geosystems
The end‐Triassic extinction (ETE) is one of the most severe biotic crises in the Phanerozoic. This event was synchronous with volcanism of the Central Atlantic Magmatic Province (CAMP), the ultimate cause of the extinction and related environmental ...
Bernát Heszler, Joachim Katchinoff, László Palcsu, Anikó Horváth, Zsolt Vallner, Emma Blanka Kovács, Noah Planavsky, József Pálfy   +7 more
doaj   +1 more source

Tracer Applications of Noble Gas Radionuclides in the Geosciences

, 2013
The noble gas radionuclides, including 81Kr (half-life = 229,000 yr), 85Kr (11 yr), and 39Ar (269 yr), possess nearly ideal chemical and physical properties for studies of earth and environmental processes.
Fischer, T. P., Kennedy, B. M., Lu, Z. -T., Purtschert, R., Schlosser, P., Severinghaus, J. P., Smethie Jr., W. M., Solomon, D. K., Sturchio, N. C., Tanhua, T., Yokochi, R.   +10 more
core   +3 more sources

Reconstruction of changes in ocean circulation and continental weathering using radiogenic isotopes in marine sediments [PDF]

, 2006
Gutjahr, Marcus
core   +1 more source

Oxygen Isotope Variations of Basaltic Lavas and Upper Mantle Rocks [PDF]

, 2001
This chapter summarizes the oxygen isotope geochemistry of terrestrial basalts and their mantle sources, including the conceptual framework for interpreting such data and the phenomenology of known variations.
Eiler, John M.
core  

60Fe-60Ni chronology of core formation in Mars

, 2014
The timescales of accretion, core formation, and magmatic differentiation in planetary bodies can be constrained using extinct radionuclide systems. Experiments have shown that Ni becomes more siderophile with decreasing pressure, which is reflected in ...
Dauphas, Nicolas, Tang, Haolan
core   +1 more source

Radiogenic age and isotopic studies: report 7

, 1993
Granulite facies ortho- and paragneisses and felsic intrusive rocks form the crystalline core of the Boothia Uplift, which extends northward from Boothia Peninsula into the Arctic Archipelago. The rocks dated come from northern Boothia Peninsula, western Somerset Island, and eastern Prince of Wales Island, between 71 °N and 74°N.
openaire   +1 more source

Radiogenic age and isotopic studies: Report 2

, 1988
Numerical error analysis is applied to typical 40Ar/39Ar data. It extends previous error treatments to al! possible variables used in the calculation of ages of samples and shows that in some cases minor corrections may contribute significantly to age uncertainties.
openaire   +1 more source