what are the characteristics and tectonic settings of the shoshonite rock association ?

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What are the characteristics and tectonic settings of the Shoshonite rock Association?
The shoshonite rock association is characterised by: hypersthene-olivine normative basalts, low iron enrichment, high Na2O + K2O, high content of light ion lithophile elements, high but variable Al2O3, high Fe2O3/FeO and low TiO2.
 
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