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Characteristics of isotope geology of sandstone-type uraniumdeposit in Yili basin,Xinjiang
Author(s): 
Pages: 150-154
Year: Issue:  3
Journal: URANIUM GEOLOGY

Keyword:  伊犁盆地砂岩型铀矿同位素年代学铀源;
Abstract: 本文对伊犁盆地可地浸砂岩型铀矿及其蚀源区进行了同位素地质特征研究,结果表明:伊犁盆地砂岩型铀矿具有多时期成矿的特点,其成矿年龄分别为82.4、60、11.4、7.1、3.5 Ma,而主要成矿期集中在第三纪的中、上新世.伊犁盆地南侧蚀源区发育有以海西期为主的花岗岩和火山岩,前者为293-316 Ma,后者为235-259 Ma.从含矿砂体精选出的锆石,其U-Pb同位素年龄为308 Ma,与蚀源区花岗岩、火山岩的时代一致,从而肯定了含矿砂体的物质来源.此外,通过对含矿砂体和蚀源区岩石U-Pb同位素体系演化特征的研究,指出伊犁盆地砂岩型铀矿具有多铀源富集的特点,这些铀源分别是:地层沉积时形成的富铀砂体(主要的)和富铀的蚀源区岩石的近代风化淋滤释出的铀.
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