Determining the ages of minerals by means of the tracks of fission fragments from uranium nuclei

Berzina, I.G.; Demidova, P. G.

doi:10.1007/bf01885938

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1972

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“…As mentioned in the preceding chapter, the double etching technique (Bigazzi 1967, Berzina andDemidova 1966) was applied. The counting was generally performed after the second etch and both kinds of tracks registered simultaneously.…”

Section: Countingmentioning

confidence: 99%

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Fission track studies on hornblende, biotite and phlogopite from Sweden

Welin¹,

Lundström²,

Åberg³

1972

Bull Geol Soc Finland

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Fission track studies and K-Ar dating on three silicate minerals from Sweden have given the following results: Fission track age K-Ar age RM 07249 hornblende, Malmberget, Fragment 1 1255 m.y. 1875 m.y. » 2 450 » RM 620569 biotite, Ingelsbo Fragment 1 305 » 975 » » 2 520 » » 3 355 » » 4 410 » RM 640448-640451 phlogopite,Ainön,Fragment 1 230 » 555 » » 2 240 » It is concluded from this investigation that due to inhomogeneous uranium distribution, recent uranium movement and sensitivity for annealing, the fission track dating technique is suitable only for the study of the last thermal event in areas which have undergone a complex geological evolution.

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Section: Countingmentioning

confidence: 99%

“…If the surface to be etched was not an interior surface during irradiation, qJqj in the above equation has to be multiplied by a factor which is 0.5-0.8, depending on the investigated material (Reimer et al, 1970). In the double etching technique used in this work (Bigazzi 1967, Berzina andDemidova 1966) an external surface is studied.…”

Section: Introductionmentioning

confidence: 99%