Results 191 to 200 of about 4,118 (239)
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Radioactive and Radiogenic Isotopes
2016Abstract Radioactive and radiogenic isotopes are chronometers and source tracers in the ocean. A radioactive isotope of a given element has a constant probability per unit time (the time constant) to decay into a radiogenic isotope of another element.
Matthieu Roy-Barman +2 more
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Radiogenic Isotopes and Mantle Evolution [PDF]
, 2021 The radiogenic decay products of radioactive isotopes have been widely used to constrain the extent of compositional heterogeneity in Earth's mantle and the evolution of the silicate Earth.
Rob M. Ellam, Ellam, Rob M.
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A global survey of radiogenic strontium isotopes in river sediments [PDF]
Chemical Geology, 2021 International audienceRadiogenic strontium isotopes are routinely used in provenance studies, but their application to sediments is often complicated by various grain size and weathering effects, which can influence measured 87Sr/86Sr ratios.
Anne Trinquier +2 more
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Experimental evidence for mineral-controlled release of radiogenic Nd, Hf and Pb isotopes from granitic rocks during progressive chemical weathering [PDF]
Chemical Geology, 2019 The role of accessory minerals in the incongruent release of Hf and Pb during continental weathering and its implications for the generation of distinct seawater isotope compositions is subject of debate.
Kalin Kouzmanov +2 more
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Geochronology and radiogenic isotope research
Reviews of Geophysics, 1979During the four year period 1975–1978 research activity in the fields of geochronology and radiogenic isotopes has been alive and quite healthy. Geochronological laboratories have added greatly to our knowledge of time relations and patterns in the crust and others have applied studies of radiogenic isotopes to problems of the sources, genesis, and ...
M. E. Bickford, W. R. Van Schmus
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Non-nucleosynthetic heterogeneity in non-radiogenic stable Hf isotopes: Implications for early solar system chronology [PDF]
Earth and Planetary Science Letters, 2010 Nucleosynthetic heterogeneity and secondary neutron capture reactions may have important implications for 176Lu–176Hf chronology and modelling of early planetary evolution.
Dewashish Upadhyay +2 more
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Radiogenic Isotopes in Weathering and Hydrology
2003Peer Reviewed ; https://deepblue.lib.umich.edu/bitstream/2027.42/155850/1/Blum_Yerel_2003_Radiogenic_isotopes ...
Blum, Joel D, Erel, Yigal
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Reviews of Geophysics, 1975
The research effort in this field over the past 4 years has been exciting and extremely productive. The review of the literature presented here covers three main areas of research: extraterrestrial geochronology, terrestrial geochronology, and the rapidly growing field of isotopic tracer applications to problems of petrogenesis.
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The research effort in this field over the past 4 years has been exciting and extremely productive. The review of the literature presented here covers three main areas of research: extraterrestrial geochronology, terrestrial geochronology, and the rapidly growing field of isotopic tracer applications to problems of petrogenesis.
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Fractionation of radiogenic Pb isotopes in meteorites and their components induced by acid leaching [PDF]
Geochimica Et Cosmochimica ActaIn this study we test the possibility that radiogenic 207Pb/206Pb ratios (207Pb*/206Pb*) in meteorites can be fractionated during partial dissolution, and explore the consequences of this fractionation for Pb-isotope chronology of meteorites.
Yuri Amelin +2 more
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Radiogene Isotope in der Umweltforschung
1997Umweltbelastungen und Altlasten konnen meistens nicht sofort und vollstandig beseitigt werden. Dazu fehlen unter anderem die finanziellen Mittel. Deshalb mus beurteilt werden, wann von einer Umweltbelastung eine Gefahr ausgeht und wann nicht. Es setzt sich langsam die Erkenntnis durch, das uber den Grenzwerten liegende Meswerte nicht zwangslaufig zu ...
Muharrem Satir, Guido Bracke
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