General compilation of isotopic work on rocks from Greenland

Abstract

1972 has seen a further development of the trend noted in Report of Activities, 1971 towards detailed isotopic studies of particular petrological and geochronological problems rather than the regional programmes of K/Ar mineral age determinations carried out previously. As the main picture of Greenland geochronology emerges so the problems to be solved become more complex and require close cooperation and mutual understanding between field and the laboratory investigators. In many studies the limits of the currently available field and laboratory techniques have been reached and in several cases now under investigation interpretation of the results involves a much more exact knowledge of the conditions under which the various rock and mineral systems become closed to loss of radiogenic daughter elements.