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加拿大阿萨巴斯卡不整合面型铀矿床形成于约1 200Ma前,尔后盆地经历了幕式大气降水注入,它穿透了基底含石墨变泥质岩和片麻岩中发育的深大断裂构造。故而晚期大气降水注入诱导的蚀变在矿床附近常表现突出。晚期阶段高岭石的出现降低了矿带附近断裂中所有粘土矿物的δD值;随着伊利石中含水量的增加,K_2O损失;也降低了K-Ar年龄值。McArthur河的研究成果结合几个不整合面型铀矿床资料表明,辐射作用不仅没有促进退化蚀变,而且进一步证实了这些矿床中粘土矿物的退化蚀变是由于沿着复合剪碎带注入的低温大气降水引起的较简单的作用过程。
The Athabasca unconformity-type uranium deposit in Canada formed before about 1200 Ma, and later the basin underwent episodic atmospheric precipitation infiltration, which penetrated into deep-bedded faults that developed in the basement including graphene-bearing argillaceous and gneiss structure. Therefore, the alteration induced by the precipitation of late atmospheric precipitation often shows prominently near the deposit. The presence of kaolinite in the late stage reduced the δD values of all clay minerals in the vicinity of the orebelt; the loss of K 2 O with increasing water content in the illite also reduced the K-Ar age value. The McArthur River results, combined with data from several unconformity facies uranium deposits, show that not only does radiation not promote degenerated alteration, but it further confirms that the degenerated alteration of clay minerals in these deposits is due to the low temperature injected along the composite shear zone Atmospheric precipitation caused by the more simple role of the process.