Potassium-argon ages of two granitoids northwest of Kumasi, Ghana
Description
Four granitic samples from two granitoids northwest of Kumasi,Ghana, have been dated using the conventional K-Ar method. Two samples NB1 NB2 from a road-cutting at Nyamebekyere village, located about 60 km from Kumasi on the Kumasi-Sunyani road gave biotite ages of 2144+/= 11 Ma and 2144+/=7 Ma, respectively. The biotite ages for two samples NTN1 and NTN2 from Kassardjan quarry, located about 3 km south of the Kumasi-Sunyani road at Ntensere village some 20 km northwest of Kumasi were 2070+/= 10 Ma and 2099+/=14 Ma, respectively. A hornblende age of 2169+/=26 Ma was obtained for NTN2 which suggests a slow cooling during the uplift of the granitoid. Although the biotite ages obtained here for the two G2 granitoids are older than most of the reported biotite ages which happen to be for G1 granites, it is too premature to generalize that G2 granitoids are older than G1 granitoids. (author). 21 refs. 1 fig. 1 tab
Additional details
Publishing Information
- Journal Title
- Ghana Journal of Science
- Journal Volume
- 29-30
- Journal Issue
- 1-2
- Journal Page Range
- p. 87-92.
- ISSN
- 0016-9544
- CODEN
- GHJSAC
INIS
- Country of Publication
- Ghana
- Country of Input or Organization
- Ghana
- INIS RN
- 28011756
- Subject category
- S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
- Resource subtype / Literary indicator
- Numerical Data
- Descriptors DEI
- ARGON 40; BIOTITE; EXPERIMENTAL DATA; GHANA; GRANITES; HORNBLENDE; ISOTOPE DATING; POTASSIUM
- Descriptors DEC
- AFRICA; AGE ESTIMATION; ALKALI METALS; AMPHIBOLE; ARGON ISOTOPES; DATA; DEVELOPING COUNTRIES; ELEMENTS; EVEN-EVEN NUCLEI; IGNEOUS ROCKS; INFORMATION; ISOTOPES; LIGHT NUCLEI; METALS; MICA; MINERALS; NUCLEI; NUMERICAL DATA; PLUTONIC ROCKS; ROCKS; SILICATE MINERALS; STABLE ISOTOPES
Optional Information
- Funding organization
- Ghana Univ., Legon (Ghana). Dept. of Physics; Ghana Atomic Energy Commission, Accra (Ghana).