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- W2022700422 abstract "The content of K, Th and U in the continental crust is estimated based on the assumption that the concentration of these elements decreases with depth asAx = A0e−x/D [11], withAx andA0 the heat production rates at depthx and at the surface, respectively. Taking the weighted mean heat production rate of the intrusive rocks of the upper crust asA0 = 2.33 μWm−3, that of the granulites representing the lower crust asAx = 0.72 μWm−3, and the mean scale heightD= 9.5km [1] the average vertical distancex = b between these intrusives and granulites is 11.2 km. Withb known and the average concentrations of K, Th and U in granulites and intrusive rocks of the upper crust the scale heights of the vertical distribution of these elements areDK = 71km,DTh = 9.5km,DU = 5.8km. The knowledge of these parameters permits to calculate the average concentrations of these elements in a 33.3 km thick crust:K= 2.19%,Th= 4.43ppm,U= 0.66ppm; Th/U = 6.7 and K/U = 3.3 × 104. The resulting heat flow is 23.0 mW m−2 which is practically identical with the value deduced from heat flow measurements. Assuming that the Th/U ratio of the entire crust—including the sediments—is 3.9, the high ratio of 6.7 in the crystalline crust indicates that about 7.2 × 1012 t U were extracted from it. All rocks with Th/U ratios <3.9 are possible sinks of this U. About half that amount is deposited in sedimentary rocks, mainly in black shales. The second important sink are the volcanic rocks of the continental margins." @default.
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- W2022700422 date "1983-03-01" @default.
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- W2022700422 title "On the content and vertical distribution of K, Th and U in the continental crust" @default.
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