Work

Rb-Sr whole-rock isotopic study of late Archaean and early Proterozoic granitoid intrusions, Kainuu, Eastern Finland

Year: 1988

Type: article

Abstract: A tonalite-granodiorite-granite suite emplaced during the late Archaean D, deformational phase yields a six point isochron age of 2,500 ± 270 Ma and an initial 87 Sr/ 86 Sr of 0.7044 ±0.0018.A rapakivi-type granite suite emplaced after the late Archaean episode and before the emplacement of early Proterozoic Jatulian dolerites yields a six point isochron age of 2,290 ± 110 Ma and an initial »'Sr/^Sr of 0.7036 ± 0.0085.Both ages are c.150-200 Ma younger than corresponding U-Pb mineral ages for the same rock: the difference is interpreted as representing continued isotopic homogenization prior to uplift although the mechanism for such large scale, fluid phase mass transfer is not well understood.

Source: Bulletin of the Geological Society of Finland

DOI: 10.17741/bgsf/60.2.002

Authors: A.N. Halliday, E.J. Luukkonen, D.R. Bowes

Institutions: Geological Survey of Finland, University of Michigan, University of Glasgow

Language: English

Topic: Geological and Geochemical Analysis

Subfield: Geophysics

Field: Earth and Planetary Sciences

Domain: Physical Sciences

Open Access status: diamond

Funders: University of Glasgow, Natural Environment Research Council

OpenAlex ID: W2747518545

FWCI:

Cites: 8

Cited by: 7

Related to: 10