山东省微山郗山地区稀土矿成矿规律探讨

Study on Metallogenic Regularities of Rare Earth Deposit in Xishan Area of Weishan County in Shandong Province

摘要:

近年来，在鲁西峄城凸起南西部郗山地区的稀土矿勘探工作取得了飞速进展。该区发育有较强的航空放射性异常，分别为г2261、г2262和г2263三个次级放射性异常，г2263异常对应已知的郗山稀土矿。以往工作表明，该稀土矿床具“岩体和构造”联合控矿的特征，即稀土矿体受控于中生代燕山期郗山杂岩体与各种类型的（构造）接触带；其成矿时代为早白垩世(110～119Ma)，与鲁西地区其他稀土矿形成时代基本一致；稀土矿成矿物质主要来源于富集地幔，成矿流体为高浓度、中高温流体，成矿流体来源于碱性岩浆分异。放射性异常较强的地段进行稀土矿找矿工作最为有利。

Abstract:

In recent years, rapid progress has been made in the exploration of rare earth deposits in the southwestern Fucheng uplift in western Shandong province. There are three secondary radioactivity anomalies, they are г2261, г2262 and г2263 respectively. The г2263 anomaly corresponds to the known Pushan rare earth deposit. As showed by previous work, the rare earth deposit has the characteristics of "rock mass and structure" combining orecontrolling, that is, the rare earth deposit is controlled by Xishan complex and various types of (structural) contact zone in Mesozoic Yanshan period. The metallogenic age is early Cretaceous (110～119Ma), which is basically consistent with other rare earth deposits in western Shandong province.The oreforming fluids are high concentration, medium temperature fluids and alkaline magma differentiation fluids. The area with strong radioactivity is most favorable for prospecting rare earth minerals.