Petrological and geochemical characteristics of E-type alaskite in the Husab uranium deposit in Namibia
The uranium ore bodies of the Husab uranium deposit in Namibia mainly occur in D-type and E-type alaskite masses.This study selected the E-type alaskite on the mining face of the deposit as the research object and conducted detailed petrographic and elemental geochemical characteristics work on it.The characteristics of major elements in the entire rock indicate that the E-type alaskite of the Husab uranium deposit has higher SiO2 and Na2O+K2O contents,while the MnO,MgO,Na2O,P2O5,and CaO contents are lower,and show peraluminous rock with higher potassium calc-alkaline series to potassic basalt series.The REE characteristics show that Eu element is slightly depleted and the fractionation of light and heavy rare earths is not obvious,being of a significant four-grouping effect.The characteristics of trace elements indicate that these samples are close to the global crust in the values of the Rb/Sr,Nb/Ta,Zr/Hf,and the E-type granite may be a crustal source rock;In addition,it can be seen from the trace element spider web diagram that the E-type granite is relatively rich in large ion lithophile elements such as Rb,K,Th,U,Pb,while Ba,Nb,Sr,Ti,etc.show significant negative anomalies;The depletion of Sr may be the result of the separation and crystallization of plagioclase during magma evolution,while the depletion of Ti may be caused by the separation and crystallization of titanium iron oxide,indicating that the magma crystallization differentiation of E-type granite is relatively complete.
FacieologyGeochemistryAlaskiteDamara orogenHusab uranium deposit in Namibia
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