川西北泥盆系沙窝子组碳酸盐岩特征及用途  

Characteristics and Application of Devonian Shawozi Formation Carbonate Rocks in Northwest Sichuan

作　　者：刘亮[1] 杨鹏涛[1] 何学锋[1] 王超 陈娜 LIU Liang;YANG Peng-tao;HE Xue-feng;WANG Chao;CHEN Na(Northwest Sichuan Geological Team,Sichuan Bureau of Geological and Mineral Resources,Mianyang 621010,China)

机构地区：[1]四川省地质矿产勘查开发局川西北地质队

出　　处：《科学技术与工程》2019年第26期46-54,共9页Science Technology and Engineering

摘　　要：川西北龙门山地区泥盆纪沙窝子组碳酸盐岩分布广泛,资源量丰富,通过碳酸盐岩各类特征分析,对其用途进行了探讨,能够有效提高碳酸盐岩资源利用效率。沙窝子组碳酸盐岩包括灰岩和白云岩,灰岩Ca O含量50.89%~55.27%,MgO含量0.12%~0.99%,Si O2含量0.62%~3.73%,SO3含量0.02%~0.087%,K2O+Na2O为0.035%~0.098%,可满足水泥、建筑、冶金等各类用途。白云岩Ca O含量28.19%~35.06%,MgO含量16.27%~21.12%,Si O2含量0.24%~7.07%,SO3含量0.020%~0.76%。碳酸盐岩(灰岩+白云岩)饱和抗压强度在35~75 MPa之间,压碎值8.2%~10.9%,坚固性指标2%~4%,碱集料反应14 d膨胀率为0.009%~0.014%;总α值为3.50×10^2~3.52×10^2Bq/kg,总β值为1.62×10^2~1.76×10^2Bq/kg;内照指数小于0.08,外照指数小于0.06;所有指标均符合建筑石料用标准。Carbonate rocks of Devonian Shawozi Formation are widely distributed in Longmenshan area,north-west Sichuan Province,with abundant resources. Through the analysis of various characteristics of carbonate rocks,the application is discussed,which can effectively improve the utilization efficiency of carbonate resources. Carbonate rocks of Shawozi Formation include limestone and dolomite. Major chemical components of limestone are CaO 50.89%~ 55.27%,MgO 0.12%~ 0.99%,SiO 2 0.62%~ 3.73%,SO 3 0.020%~0.087%,K 2O+Na 2O 0.035%~ 0.098%. It can be used for cement,construction and metallurgy. Major chemical components of dolomite are CaO 28.19%~35.06%,MgO 16.27%~ 21.12%,SiO 2 0.24%~ 7.07%,SO 3 0.02%~ 0.76%. Physical and mechanical properties of carbonate rocks (limestone+dolomite) indicate that saturated compressive strength ranges from 35 to 75 MPa,crushing index 8.2%~ 10.9%,hardness index 2%~ 4%,expansion rate of alkali aggregate reaction for 14 d is 0.009%~0.014%. The total α value is 3.50×10^2~3.52×10^2,the total β value is 1.62×10^2~1.76×10^2;the internal exposure index is less than 0.08 and the external exposure index is less than 0.06. All indicators meet the building stone standards.

关 键 词：川西北 沙窝子组 碳酸盐岩 用途 建筑石料 

分 类 号：P558[天文地球—构造地质学]