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Sierra Pe(?)a Blanca地区是与火山岩有关铀矿床的一个明显实例。在该地区,火山岩既是矿床的主岩,又是铀源层。矿化主要产于新生代火山岩堆积体(Nopal和Escuadra流纹岩)下部层位,此堆积体覆盖在中生界钙质基底之上。已确定有3种成因类型的铀矿化:热液型;大气降水-喷气混合型;表生型,相应的代表性矿床为:Nopal 1号矿床;Las Margaritas矿床以及Puerto 3号矿床。 本文总结了该区不同地段有关蚀变、矿化、断层-裂隙型式、流体包裹体以及裂变径迹等的最新研究成果。
The Sierra Peña Blanca area is a clear example of volcanic rock-related uranium deposits. In this area, volcanic rock is both the host rock and the uranium source. Mineralization occurs primarily in the lower layers of the Cenozoic volcanic deposits (Nopal and Escuadra rhyolites), which overlie the Mesozoic calcareous substrates. Three types of genetic types of uranium mineralization have been identified: hydrothermal; atmospheric precipitation-jet mixed; epiphytic; the corresponding representative deposits are Nopal 1; Las Margaritas and Puerto 3 deposits. This paper summarizes the latest research results on alteration, mineralization, fault-fissure types, fluid inclusions and fission tracks in different parts of the area.