姜梨园铁矿成矿地质特征及成矿过程分析

On metallogenic geological properties and metallogenic process of Jiangliyuan Iron Deposit

沛县姜梨园铁矿为矽卡岩型铁矿,主要产于燕山期中基性(角闪)闪长斑岩与下奥陶系肖县组下段碳酸盐岩地层的接触带附近,矿石类型主要为磁铁矿和假象赤铁矿。矿区围岩蚀变分布广泛,有热力变质,钠长石化,矽卡岩化和中低温热液蚀变4种,其中,钠长石化和矽卡岩化与铁矿关系密切;断裂构造较发育,F1断层是主要控岩控矿构造,近东西走向,向北陡倾斜为正断层,断距300多m,姜梨园上层铁矿和姜梨园下层铁矿分居其南北两侧。

As a kind of skarn-type iron deposit, Jiangliyuan Iron Deposit in Peixian County was occurred near a contact zone between moderate basic （hornblende） dioritic porphyry of Yanshanian epoch and carbonate rock layers of lower Xiaoxian Formation in lower Ordovician system, with magnetite and martite as the main ore types. Wall rock alteration was widely spread in the district; There were four types of alterations ： thermodynamic metamorphism, albitization, and skarnization and moderate-low temperature thermal fluid alteration. In which, albitization and skarnization had a close relationship with iron deposit; Fracture structures were developed, and F1 fault was the major rock and mineral controlling structure, with near westeast strike, sharp inclination towards the north and was a normal fault of 300 meters long. The upper and lower layers of Jiangliyuan iron deposit were located in the north and south sides of the fault.