摘要
俄罗斯外贝加尔地区晚侏罗世斯特列措夫破火山口中的铀矿床是世界上最大的与火山岩有关的铀矿区,铀储量为280 000 t U,是俄罗斯最大的铀资源产地。该破火山口地层柱大约1/3是强烈蚀变的流纹岩。斯特列措夫破火山口中的铀资源比世界上其他与火山有关的任何铀矿区都大得多,除了热液蚀变的功效之外,可能是由同等重要的两大铀来源造成的:破火山口中高度分异的侏罗纪流纹岩和基底中的海西期富铀亚碱性花岗岩;富铀亚碱性花岗岩中的主要含铀副矿物在发生热液成矿作用的时候都是变生非晶质矿物。
The uranium deposit of the Late Jurassic Streltsovsky caldera in Transbaikalia of Russia is the largest uranium field associated with volcanics in the world, its uranium reserves are 280 000 t U, and it is the largest uranium resources in Russia. About one third of the caldera stratigraphic pile consists of strongly-altered rhyolites. Uranium resources of the Streltsovsky caldera are much larger than any other volcanic-related uranium districts in the world. Besides, the efficiency of hydrothermal alteration, uranium resources appear to result from the juxtaposition of two major uranium sources: highly fractionated peralkaline rhyolites of Jurassic age in the caldera, and U-rich subalkaline granites of Variscan age in the basement in which the major uranium-bearing accessory minerals were metamict at the time of the hydrothermal ore formation.
出处
《世界核地质科学》
CAS
2005年第2期90-94,共5页
World Nuclear Geoscience
