宁夏贺兰石赋存特征及矿物成分分析

贺兰石是宁夏的五宝之一,具有极大的经济价值和人文含义.以银川市西部的贺兰山中段为研究区,调查分析贺兰石的赋存特征和矿物成分特征,结论认为(1)贺兰石含矿岩性段赋存于青白口系黄旗口组第一岩段下部,呈狭长的条带状分布,层位稳定连续,走向大致呈南北向,顺走向延伸长度约14 km.含矿层的厚度8～23 m;(2)矿石主要成分为粘土质矿物、绢云母和绿泥石,矿石的化学成分主要为SiO2、AI2O3、Fe2O3、K2O;(3)矿石吸水率均低于1%,矿石摩氏硬度为2～4,矿石体重平均为2.89 g/cm3,矿石抗压强度为58.17 MPa,抗拉强度7.1 MPa,抗剪强度19.16 MPa;(4)研究区贺兰石开采前景广阔,具有较大的工业价值.

Analyze Occurrence Characteristics and Mineral Composition of Helan Stone in Ningxia

Helan stone is one of five treasures in Ningxia,and has great economic value and cultural meaning.This paper takes the middle Helan mountain in the west of Yinchuan City as the research area,which investigated and analyzed the occurrence characteristics and mineral characteristics of Helan stone.It can be concluded that(1) Ore-bearing lithologic of Helan stone occured in the lower part of the first rock segment in Huangqikou Fm of Qingbaikouan System,and which is narrow banded distribution,stable continuous layer,roughly north-south direction,extending along the length of about 14 km.The thickness of the ore-bearing lithologic is between 8 to 23 m;(2) The main components of the ore are clay minerals,sericite and chlorite,and the main chemical ones are SiO2,Al2O3,Fe2O3,K2O;(3) The water absorption of the ore are less than 1%.Mohs scale of hardness is between 2 to 4.The average density is 2.89 g/cm3.The compressive strength is 58.17 MPa.The tensile strength is 7.1 MPa,and shear strength is 19.16 MPa;(4) Helan stone has broad mining prospects and large industrial value in the research area.