Results 181 to 190 of about 19,693 (231)
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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, Catherine Jeandel
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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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Radiogenic Isotope Geochemistry
2016Isotopes provide important information on many geological processes, with key relevance to the mining and petroleum industries, yet the techniques to obtain, process and interpret the data can be complex to master. This accessible book provides broad coverage of radiogenic isotopes in geochronology and geochemistry, explaining the basic principles and ...
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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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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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Radiogenic isotopes in fluid inclusions
Lithos, 2001Abstract Radiogenic isotopes studied in fluid inclusions are still a limited field, with great potential for expansion as analytical techniques improve. The main limitation for Sr, Ar and He isotope work is the very small number of radiogenic atoms produced in a typical fluid inclusion. The requirements to analysts are correspondingly high.
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2005
The third edition of Radiogenic Isotope Geology examines revolutionary changes in geochemical thinking that have occurred over the past fifteen years. Extinct-nuclide studies on meteorites have called into question fundamental geochemical models of the Earth, while new dating methods have challenged conventional views of Earth history. At the same time,
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The third edition of Radiogenic Isotope Geology examines revolutionary changes in geochemical thinking that have occurred over the past fifteen years. Extinct-nuclide studies on meteorites have called into question fundamental geochemical models of the Earth, while new dating methods have challenged conventional views of Earth history. At the same time,
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Radiogenic and Stable Isotopes, Fluid Inclusions
2019Samarium and Nd isotope data are used to provide information on the source of melts, as well as to determine the age of the rocks. Several samples yield extreme high 147Sm/144Nd ratios of >0.3, indicating extreme fractionation of the REE. This is also reflected in their calculated present day eNd values of eNdt = 0 at >40.0.
Thomas Dittrich +5 more
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Production and Distribution of Radiogenic Isotopes
2012At present, more than 20 long-lived radioisotopes of heavy elements are known to exist in the Earth’s crust. These are evidence of the gigantic processes which resulted in the formation of chemical elements in our galaxy. The main characteristics of these elements are shown in Table 16.1.
V. I. Ferronsky, V. A. Polyakov
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Sources of oceanic basalts: Radiogenic isotopic evidence
Geology, 1985Oceanic basalts can be subdivided into five distinct groupings on the basis of their Sr, Nd, and Pb isotope composition. These classes, represented by mid-ocean ridge basalts (MORB) and St. Helena, Kerguelen, the Society Islands, and the Hawaiian Islands, may represent different but internally heterogeneous mantle reservoirs or merely distinct groups ...
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