海南岛离子吸附型稀土矿成矿规律及找矿新发现

Metallogenic regularity and new exploration finding of the ion-absorption-type REE deposits in Hainan Island

重点研究了海南岛离子吸附型稀土矿的矿床(点)时空分布、稀土矿类别、成矿母岩种类及其空间分布、母岩地球化学特征、风化壳发育程度、地形地貌、气候条件等方面的成矿规律特征,并在此基础上新发现一具有特大型稀土矿找矿前景的什运稀土矿点。在区域成矿模式上,认为海南岛离子吸附型稀土矿的成矿作用大体可分为三个阶段:第一阶段为印支中晚期或燕山晚期岩浆演化较晚阶段,第二阶段为风化壳形成阶段,第三阶段风化壳离子吸附型稀土矿形成阶段。

This paper is focused on the deposit characteristics of the metallogenic regularity,including the temporal and spatial distribution,REE mineral category,metallogenic host rock types and their spatial distribution,the geochemistry of these host rocks,the development degree of the weathered crust,topography and landform,and climatic condition of ion-absorption type REE deposits in Hainan Island.On the basis of these data,Shiyun REE mineral occurrence is found out with a great exploration prospective for the super-large scale REE deposit.On the regional metallogenic model,the paper has suggested that the mineralization period of the ion absorption type REE deposit in Hainan Island,could be divided into three stages,the first one is in the late stage of the middle-late Indosinian or late Yanshanian magmatic evolution,the second one is in the formation period of the weathering crust,and the third stage is in the formation process of ion-absorptiontype REE deposit in the weathering crust.