松辽盆地钱家店铀矿床成矿作用特征及成矿模式

Geologic characteristics and metallogenic model of Qianjiadian uranium deposit in Songliao basin

笔者通过对钱家店铀矿床地质特征、成矿作用地球化学特征的研究,认为钱家店铀矿床为典型的同生沉积后生叠造复成因可地浸砂岩型铀矿床。矿床定位受晚白垩世姚家期辫状河道洼地、晚白垩世嫩江期末至古近纪构造反转隆升剥蚀构造窗及浅层含氧含铀水与深部油田还原性流体交替混合地球化学障等地质因素控制。矿床成矿作用历经了同生沉积成矿、油田流体叠加成矿和含氧含铀流体叠加成矿3个阶段。矿床形成年龄为96±14 Ma、67±5 Ma和40±3 Ma。在总结矿床成矿地质特征、成矿作用地球化学特征的基础上,建立了钱家店铀矿床成矿模式。

Based on the research of geologic and geochemical characteristics of Qianjiadian uranium deposit, it is considered that the deposit is a leachable sandstone type uranium deposit with typical complex origin of synsedimentary and epigenetic superimposed alteration, Location of the deposit is controlled by the geologic factors of billabongs of braided river of Yaojia period of Lower Cretaceous, denuded windows of lifted reverse structures formed from Late Cretaceous to Paleogene and geochemical barriers formed by the mix of oxo and uranous water in shallow sequence to the reducible oil flow. Metallogenesis of the deposit experienced three stage, they are metallogenesis of synsedimentary, metallogenesis of oil field flow epigenetic superimposed alteration and metallogenesis of superimposed alteration of oxo and uranous flow. The age of the deposit is 96±14 Ma, 67±5 Ma and 40±3 Ma. Based on the summaring of geologic characteristics and geochemical characteristics, the metallogenic model of Qianjiadian uranium deposit is set up for the basin.