Structural Evolution and Its Restriction on Uranium Mineralization in Gaudeanmus Area, Namibia
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    Abstract:

    The Gaudeanmus area is composed of Neoproterozoic felsic rocks interbedded with mafic rocks. This area experienced deep crustal strong ductile deformation, under the tectonic setting of continental collision events of the Damara phase. In the post collision stage, extensive stretch thinning and granite magmatism formed a variety of leucogranites(alskites). Uranium minerals mainly exists in type D and type E of alaskites which are S granites source from crust. The Gaudeanmus area has experienced four period and five stages of tectonic evolution: pre Damara stage structure deformation, Damara collisional orogenic stage ductile deformation (early stage of thrust extrusion and late stage of the strike slip ductile shear deformation), post Damara stage brittle deformation and Cenozoic uplifting related brittle deformation, respectively. The extensively developed granites belong to syntectonic plutons. Measurement of joints in the metamorphic rocks and granites yielded, thousands groups occurrences of joints from 27 locations, basically determining the regional after collision stress field in the study area. The most principal compressive stress direction is between N260°~350°, followed by those between N110°~129° and N345°~360°. The dense joint structures preserved in all kinds of rocks were formed by post tectonic tectonic exhumation or magma upwelling that reached upper crust levels, which are closely associated with uranium enrichment.This study further discussed the Damara phase structure, ductile shear, the late stage brittle structure associated with the genesis of uranium mineralization.

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GU Dazhao, FAN Honghai, SHU Liangshu, XU Xisheng, YAO Jinlong, ZHAO Kai, CHEN Jinyong.2016. Structural Evolution and Its Restriction on Uranium Mineralization in Gaudeanmus Area, Namibia[J]. Geological Review,62(1):83-93.

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History
  • Received:November 05,2014
  • Revised:September 25,2015
  • Adopted:
  • Online: January 19,2016
  • Published: