Computer Science
Scientific paper
Jun 1972
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972gecoa..36..673h&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 36, Issue 6, pp.673-683
Computer Science
8
Scientific paper
Chemical data from the Canadian Shield and the Precambrian of Scotland indicates that there is a progressive enrichment towards the surface in potassium and possibly in titanium, but observed variations in titanium do not form a simple pattern. The averages for the surface of the shield areas are more siliceous and sodic, and poorer in potassium, titanium and the ferro-magnesian elements than are most published continental crustal averages. Assuming that granulite facies rocks form a substantial part of the shields, the total shield analysis becomes richer in iron, magnesium and calcium, and poorer in silicon and potassium than published estimates of the composition of the shields, and because the shields form the dominant fraction of the continental crust, substantial differences in the average for the continental crust emerge compared with estimates based on igneous rocks. In particular, a total continental crust rich in granulite facies rocks is likely to be richer in silicon and sodium, poorer in iron, magnesium and potassium and very much poorer in titanium than one based on igneous compositions.
Holland James Grenville
Lambert Richard St John
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