Neuere Beiträge zur Geochronologie und Geochemie

Meier, Harald

doi:10.1007/bfb0051903

Cited by 3 publications

(3 citation statements)

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“…As in equilibrium for each decaying parent atom, on the average also one of each inter mediate daughter atom decays, it can be written approximately (MEIER, 1966) Ai Ni = A218 N218 = A214 N214 = A21o N210 (1) 0.693 0.693 0.…”

Section: Discussionmentioning

confidence: 99%

“…It is known that the fission track ages of biotite and other minerals may be discordant with the real age of the mineral determined by the K-Ar or Rb-Sr methods (MEIER, 1966;WAGNER, 1973;WELIN et al, 1972;OSBORNE, 1947;LAKATOS and MILLER, 1973;BIGAZziet al, 1971;MILLER and JAGER, 1968;MILLER, 1968;GUPTA et al, 1971). For instance, younger fis sion track ages are caused by thermal annealing of fission tracks (HAACK and POTTS, 1972) in accordance with eq.…”

Section: Ormentioning

confidence: 97%

“…Therefore, it is possible to find alpha emitters of the decay series of 238U or 232Th in microscopic inclusions from the Precambrian up to the Tertiary, which might be of interest in chronological estimations (LON GINELLI, 1960;PRZIBRAM, 1953;MEIER, 1966;HIR SCHMANN, 1967) or in an examination of the con stancy in time of the radioactive decay (GENTRY, 1973;SPECTOR, 1972). Moreover, it is possible to get from anomalous halos hints at extinct radionuclides or at the existence of radio nuclides which are unknown up to now.…”

Section: Introductionmentioning

confidence: 99%

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Radioactive halos as possible indicators for geochemical processes in magmatites.

Meier¹,

Hecker²

1976

Geochem. J.

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In systematic microscopic measurements completed by fission track studies the occurrence of polonium halos and polonium bands could be confirmed in biotites of different areas. The abundance of the different types of polonium halos is given by the order 210Po ) 218Po > 214po. As magmatic and often also hydrothermal mechanisms are contrary to geological evidences a supergene hypothesis has been supposed for the genesis of the polonium halos. According to this mechanism polonium isotopes are accumulated out of uranium or radium-bearing solutions which are liberated from rocks by leaching processes of percolating weathering waters. The concept of the given origin of polonium halos may be significant in discussing problems of dating, uranium prospection and the origin of secondary uranium deposits.

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Section: Discussionmentioning

confidence: 99%