一、緒言大栗子铁矿床賦存于前震旦紀辽河系地层中。这套岩层包括:千枚岩,碳酸鹽岩石,砂岩以及千枚岩与碳酸鹽和千枚岩与砂岩互层等。前震旦紀地层在本区構成一个軸向东北西南,向南傾沒之复向斜,已知矿体絕大多数賦存于复向斜西北翼小向斜之軸部或小背斜的鞍部。西北翼地层走向一般为北东东,向南作 I. INTRODUCTION The large chestnut iron deposit occurs in the Liaohe system stratigraphy of the former Sinian. This rock formation includes: phyllites, carbonate rocks, sandstone, phyllite and carbonate interbeds with phyllite and sandstone. Pre-Sinian strata in this area form an axially northeast-southwest, southward dip complex syncline, the vast majority of known ore bodies occur in the synclinal northwest wing of the small syncline axis or small anticlinal saddle . Northwest Wing formation generally toward the north east, south