320铀矿床成矿角砾岩成因新识

本文介绍在３２０铀矿床中首次发现的热液隐爆现象。提出该矿床中的成矿角砾岩是以构造岩成因为主、热液隐爆为辅的复成因认识。角砾岩中的晶洞是多成因的，其中以构造角砾岩成因晶洞为主，另可由热液隐爆、粗体生物化石溶失和脱落（印模）、古岩溶和现（近）代热泉水溶蚀、岩石中黄铁矿溶失等造成。推测硅化角砾岩的原岩为硅岩、炭质页岩和炭泥质生物屑灰岩。

A NEW GENETIC UNDERSTANDING FOR THE MINERALIZED BRECCIA FROM THE URANIUM DEPOSIT No. 320

The hydrothermal cryptoexplosion was found in the uranium deposit No. 320 for the first time. A polygenetic understanding is presented in this paper that the mineralized breccia in the deposit is mainly attributed to tectonite genesis and secondarily attributed to the hydrothermal cryptoexplosion. Geodes in breccia are of multigenesis,of these,the geodes from tectonic breccia are the most important,other geodes may be attributed to the hydrothermal cryptoexplosion,disgolution and dropping (stripping)of coarse biological fossils, paleokarst and modern hot spring water corrosion,dissolution of pyrite in rocks,etc. It is inferred that the original rocks of silicified breccia are silicalite, carbonaceous shale and carbonaceous politic limestone rich in biogenic debris.