Physics
Scientific paper
Oct 1965
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1965gecoa..29.1115a&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 29, Issue 10, pp.1115-1130
Physics
11
Scientific paper
Rb-Sr measurements on six total-rook samples and associated mineral fractions from the Cape Granite are reported, together with K-Ar measurements on two biotites. The total-rock age of the granite is 553 ± 8 m . y . and the mineral ages (both Rb-Sr and K-Ar) are essentially in agreement, but suggest that a mild metamorphism has caused some daughter-product migration from biotites and K-feldspars. The apparent age of a cross-cutting mass of aplogranite is 500 ± 15 m . y . The Rb-Sr `isochron' relating to five samples of Malmesbury sediments is remarkably linear, and the related problem of inherited radiogenic Sr in clastic sediments is discussed. It is concluded that the age of the Malmesbury cannot greatly exceed the apparent age obtained from the isochron: 595 ± 45 m . y . It is possible, though unproved, that the granite was formed by the remobilization of the sediments at depth.
Allsopp H. L.
Kolbe P.
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