西峡县陈阳坪铍铷矿地质特征

在东秦岭西官庄-镇平断裂带陈阳坪地区进一步发现稀有金属矿产后,为了解铍铷矿床特征,对陈阳坪花岗伟晶岩型铍铷矿石矿物电子探针特征及矿区地质等进行了综合分析研究.本区发现伟晶岩脉11条,铍铷矿体4条,矿体长105～1100 m,厚4.26～7.00 m,BeO品位:0.035％～0.0445％,Rb2O品位:0.046％～0.123％.矿石有用矿物为钾长石、白云母、绿柱石、石榴子石等,钾长石晶体裂隙中可见绿柱石,为含铍的重要矿物;白云母集中于花岗伟晶岩中带,铯榴石不均匀出现于伟晶岩边部、构造裂隙、钾长石颗粒间隙,为含铯铷矿物.据矿石矿物电子探针分析,矿石中的铷主要赋存于钾长石、白云母矿物.产于晋宁期花岗伟晶岩中的铍铷稀有金属矿,矿体受伟晶岩脉控制,晋宁期的岩浆活动为本区铷矿、稀有元素形成提供了丰富的物质来源,经后期构造及岩浆热液活动使岩体中的铍、铷元素活化富集形成稀有金属矿床.在矿区东部及南部也存在类似地质构造特征,陈阳坪地区花岗伟晶岩的研究成果对豫西南铍铷等稀有金属矿产取得进一步找矿突破具有一定意义.

Geological characteristics of beryllium rubidium deposit in the Chenyangping area, Xixia County

To understand the characteristics of beryllium rubidium ore, we find rare- metallic mineral resources in the Xiguanzhuang- Zhenping fault zone of East Qinling Mountains from the Chenyangping area, and integrated analysis was done on the electron probe characteristics of Chenyangping granite- pegmatite- type Beryllium Rubidium ore mineral and the geological characters of the mining area. Here we find 11 pegmatite veins and 4 Beryllium orebodies, the orebodies are 105~1100m in length and 4.26~7.00m in thick, BeO grade: 0.035%~0.0445%, R2O grade: 0.046%~0.123%. The economically valuable minerals of the ores contain K- feldspar, muscovite, beryl, garnet, etc. Beryl is an important beryllium- bearing mineral, and it appears in K- feldspar fissures in the studies area. Muscovites are concentrated in the middle part of granite pegmatite. Pollucite is a cesium- rubidium- bearing mineral, it unevenly appears in edges of pegmatite, tectonic fissures, and the clearances of K- feldspar grains. According to the analysis of the mineral electron probe, rubidium mainly occurs in K- feldspar and muscovite. The distribution of beryllium- rubidium rare- metallic minerals in Jinningian granite pegmatite are controlled by pegmatite veins. The magmatic activities during the Jinningian provided rich material sources for the formation of rubidium and rare elements in the studied area, through the later tectonic and magmatic- hydrothermal activities, beryllium and rubidium in the rock mass were activated and enriched to form rare metal ores. Similar tectonic features exist in the eastern and southern parts of the mining area, so it is of great significance to strengthen the study of granite pegmatite in the Chenyangping area for the further exploration of rare metal minerals such as beryllium in southwest Henan province.