Neutron activation Rb-Sr method applied to study biotites with high Rb-Sr ratio
Creators
- 1. AN SSSR, Leningrad. Inst. Geologii i Geokhronologii Dokembriya
- 2. AN SSSR, Moscow. Inst. Geokhimii i Analiticheskoj Khimii
Description
The possibilities of dating of biotites by Rb-Sr neutron activation method are considered. Dating by new Rb-Sr neutron activation method can by applied to samples having 0.2>=Rb/Sr>=3, that is a significant part of terrestrial and cosmic rocks and minerals. For samples having Rb/Sr>=3 nuclear reactions on thermal and fast neutrons are used: 85Rb(n,γ)86Rb → 19 days 86Sr and 87Rb(n,2n)86Rb →19 days 86Sr correspondingly. Age is estimated only from Sr isotopy. If Rb/Sr<=0.2 nuclear reaction 86Sr(n,p)86Rb is used and age is estimated from Rb and Sr isotopy. Isotopic composition of K is suggested to use as a neutron monitor. Isotopic analysis of Rb, Sr and K is reasonable to determine directly from the samples without chemical extraction. Primary experimental results for biotites with high Rb/Sr ratio are given in the paper
Additional details
Additional titles
- Original title (Russian)
- Нейтронно-активационны Рб-Ср метод в приложении к изучению биотитов с высоким отношением Рб/Ср
Publishing Information
- Journal Title
- Geokhimiya
- Journal Issue
- no.2
- Series
- Geokhimiya.
- ISSN
- 0016-7525
INIS
- Country of Publication
- Russian Federation
- Country of Input or Organization
- USSR
- INIS RN
- 11569794
- Subject category
- S58: GEOSCIENCES;
- Descriptors DEI
- BIOTITE; ISOTOPE DATING; ISOTOPE RATIO; NEUTRON ACTIVATION ANALYSIS; RUBIDIUM 86; STRONTIUM 86
- Descriptors DEC
- ACTIVATION ANALYSIS; AGE ESTIMATION; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; CHEMICAL ANALYSIS; DAYS LIVING RADIOISOTOPES; EVEN-EVEN NUCLEI; INTERMEDIATE MASS NUCLEI; ISOMERIC TRANSITION ISOTOPES; ISOTOPES; MICA; MINERALS; MINUTES LIVING RADIOISOTOPES; NUCLEI; ODD-ODD NUCLEI; RADIOISOTOPES; RUBIDIUM ISOTOPES; STABLE ISOTOPES; STRONTIUM ISOTOPES