滇东北阳新组一段与二段野外划分标志  

THE FIELD DIVISION CRITERIA OF MEMBER 1 AND 2 OF YANGXIN FORMATION IN NE YUNNAN

作　　者：刘德民[1] 王慧平[2] 李致伟 吕晓春[2] 

机构地区：[1]中国地质大学(武汉)地球科学学院,湖北武汉430074 [2]中国人民武装警察部队黄金第十支队,云南昆明650001

出　　处：《云南地质》2017年第4期435-443,共9页Yunnan Geology

基　　金：基金项目:1:5万岔河;者海;待补;务德四幅区域地质;矿产调查(编号:12120113072100;12120115041601)

摘　　要：滇东北地区中二叠统阳新组灰岩广泛分布,该组划分的一段和二段在野外识别划分较为困难。通过近期的区域地质调查,笔者等从一段和二段各自的颜色深浅、岩层厚度及总体厚度的差异、豹皮(虎斑)灰岩的形态及发育状态、方解石团块、方解石脉等,以及钙质成分与硅质岩、硅质条带等硅质成分的多少、淡水方解石、风化铁疙瘩、海泡石等特殊矿物的出现等,诸多方面的差异可作为一段(栖霞组灰岩)与二段(茅口组灰岩)的划分标志。Middle Permian Yangxin Formation limestone is widely distributed in NE Yunnan area. The field division of Member 1 and 2 of this Formation is difficult. In the recent regional geological survey, we have regarded the color dark or pale,difference of rock bed thickness and general thickness,the form and development state of leopard( tiger stripes) limestone,calcite nodule,vein,etc,calc,siliceous rock,band more or less,the occurrence of fresh water calcite,weathering Fe nodule,sepiolite,etc special mineral as the division criteria of Member 1( Qixia Formation limestone) and 2( Maokou Formation limestone).

关 键 词：阳新灰岩 分段标志 野外 滇东北 

分 类 号：P534.46[天文地球—古生物学与地层学]