Composition of the Precambrian Llano Uplift,central Texas,U.S.A. |
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| Authors: | Linda A Johnson John JW Rogers Richard M Nagy |
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| Institution: | Department of Geology, Rice University, Houston, Texas 77001, U.S.A. |
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| Abstract: | The Llano uplift exposes rocks of approximately 1000 m.y. age. The weighted average composition of the exposed crust is: 70.7% SiO2; 0.35% TiO2; 13.6% A12O3; 3.4% total Fe as Fe2O3; 1.1% MgO; 2.6% CaO; 3.3% Na2O; and 4.4% K2O. This composition is similar to, but more potassic, than equivalent estimates for the Canadian shield. |
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