Radiometric determination of thorium, uranium and potassium in basalts and in two magmatic differentiation series

Details Radiometric determination of thorium, uranium and potassium in basalts and in two magmatic differentiation series Radiometric determination of thorium, uranium and potassium in basalts and in two magmatic differentiation series

Feb 1963

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1963gecoa..27..137h&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 27, Issue 2, pp.137-154

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23

Scientific paper

Thorium, uranium and potassium contents of basalts and other basic rocks have been measured by gamma-ray spectrometry. The ratios of Th/K, U/K and Th/U are constant within one order of magnitude in a wide variety of rock types. The averages for basalts are: Th / K × 10 4 = 2.8, U / K × 10 4 = 0.60 and Th / U = 4.8. Some tendency exists, however, for increase in these ratios with igneous differentiation, as shown by investigations of the Duluth and Southern California intrusive sequences. The Th/U ratio is particularly low in tholeiites (1·6) from the orogenically active Japanese area and is also lower in the basic rocks of the Duluth and Southern California sequences than in most basalts. Apparently the process which leads to the formation of magma in orogenic areas causes removal of thorium, potassium and to a lesser extent, uranium from source materials before intrusion or eruption. Close relationship between potassium content and Th/U ratio in basic rocks from widely separated areas, however, suggests that the subcrust in which basic magmas originate is compositionally uniform and differences between the compositions of primary basalt magmas are probably the result of local processes.

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