福建霞浦大湾铍钼矿床地质特征及成因初探

On Geological Characteristics and Genesis of the Dawan Beryllium and Molybdenum Deposit in Xiapu County,Fujian Province

霞浦大湾铍钼矿体主要产于晚侏罗世南园群鹅宅组与赤水组火山碎屑岩接触带附近的裂隙带中,辉钼矿石英脉呈脉状、铍矿体呈似层状分布在脉状辉钼矿体两侧,围岩蚀变具水平分带和垂直分带特征,以中-高温面状蚀变为主,成矿作用与岩浆活动和裂隙构造关系密切,属中-高温热液充填-交代型铍钼矿床,成矿时代为晚侏罗世。

The beryllium and molybdenum orebodies in the Dawan beryllium and molybdenum deposit of Xiapu County are mainly discovered in the fractured zones near the contact zone of Late Jurassic Ezhai and Chishui Formation volcaniclastic rocks.The quartz veins of molybdenite occur in veins and the beryllium orebody is distributed in the veiny molybdenite as a stratoid pattern.The alteration of wall rocks takes on the characteristics of horizontal and vertical zonation and gives priority to the intermediate and high temperature sheet alteration.The ore-forming process is hand in glove with magmatic activity and fissuring structures.The deposit belongs to the intermediate and high temperature hydrothermal filling and metasomasis type of a beryllium molybdenum deposit.It is inferred that the metallogenetic time of the deposit is Late Jurassic.