四川龙门山地区阳新组灰岩地质特征及用途

二叠系阳新组灰岩厚度240~350 m，走向延伸大于50 km，出露面积15 km2以上，资源储量极为丰富.研究区0.6 km2范围内资源量为5193×104 t.阳新组灰岩CaO含量49.87%~55.74%，MgO含量0.24%~2.80%，SiO2含量0.38%~5.80%之间，SO3含量0.01%~0.40%，K2O+Na2O含量0.02%~0.12%，均达到Ⅰ级水泥用料要求.饱和抗压强度41.6~82.4 MPa，坚固性1%~3%，压碎指标8.2%~9.6%；所有指标均符合建筑石料用要求.对阳新组灰岩地质特征、物理化学指标的分析评价显示，其可广泛运用于水泥、建筑石料等领域，具有重要的经济价值和意义.

GEOLOGY AND UTILIZATION OF YANGXIN FORMATION LIMESTONE IN LONGMENSHAN AREA,SICHUAN PROVINCE

The limestone of Yangxin Formation, Permian, is 240-350 m thick with the strike extension more than 50 km, exposed area over 15 km² and abundant resource reserves. The resources is 51.93 Mt within a 0.6 km² range of the study area. In terms of the main chemical composition content in Yangxin Formation limestone, CaO is 49.87%-55.74%, MgO 0.24%-2.80%, SiO₂ 0.38%-5.80%, SO₃ 0.01%-0.40%, and K₂O+Na₂O 0.02%-0.12%, which all meet the requirements of grade-I material for cement. The saturated compressive strength of 41.6-82.4 MPa, firmness of 1%-3% and crushing index of 8.2%-9.6% all reach the required indexes of building stone. The analysis and evaluation on the geological characteristics and physical-chemical indexes of Yangxin Formation limestone show that it can be widely used in cement, building stone and other fields, and has important economic value and significance.