Composition of the Precambrian Llano Uplift, central Texas, U.S.A.

Details Composition of the Precambrian Llano Uplift, central Texas, U.S.A. Composition of the Precambrian Llano Uplift, central Texas, U.S.A.

Nov 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976gecoa..40.1419j&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 40, Issue 11, pp.1419-1420

Computer Science

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Scientific paper

The Llano uplift exposes rocks of approximately 1000 m.y. age. The
weighted average composition of the exposed crust is: 70.7% SiO 2 ;
0.35% TiO 2 ; 13.6% A1 2 O 3 ; 3.4% total Fe as Fe 2 O 3 ; 1.1% MgO;
2.6% CaO; 3.3% Na 2 O; and 4.4% K 2 O. This composition is similar to,
but more potassic, than equivalent estimates for the Canadian shield.

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