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Geology, petrology, and tungsten mineralization of the southern Lodi Hills, Nye County, Nevada
AdvisorHibbard, M. J.
Geological Sciences and Engineering
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The geology of the southern Lodi Hills is dominated by a Mesozoic age intrusive complex composed of numerous stocks with compositions ranging from granite to quartz - gabbro (calc-alkaline series). Emplacement of the complex into Triassic age carbonate sequences was structurally controlled, and in part, syntectonic with the Nevadan Orogeny. Salient features of the complex include a variable sodic feldspathization, and localized overprints of deformation, metamorphism, structure, and metasomatic alteration. Concentrations of hydrothermal activity along some contacts and shear zones has produced economic concentrations of tungsten, quartz -tourmaline veining, and various alterations. Areas of feldspathized and mineralized intrusive coincide with migmatitic areas within border facies. Associated scheelite mineralization is present in altered skarn, in feldspathized and migmatized altered granitoid, and in late - stage quartz - tourmaline vein environments. Traces of gold, molybdenem, and tin are associated with the intrusive complex.
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Mesozoic age intrusive complex
Triassic age carbonate sequences