青龙地区铁矿类型及其矿床地质特征

在长期野外工作的基础上，对河北青龙地区的铁矿类型、产出特征及BIFs主要成因进行了总结。认为青龙铁矿类型主要有（火山）沉积变质型（BIFs）、接触交代型及少量岩浆岩型。BIFs主要赋存于太古代迁西岩群、滦县岩群和朱杖子岩群等，矿石以磁铁石英岩为主，呈层状或透镜状产出，其成因与海底火山间歇喷发密切相关，条带状硅铁韵律层代表了海底火山喷气的周期性旋回，生物作用参与了铁层沉积。

Types and Geological Characteristics of the Iron Deposits in Qinglong

On the basis of long-term fieldwork，summarized the types of iron deposits in Qinglong，the output characteristics and brief geogenesis of banded iron formations(BIFs). It is considered that the main types of Qinglong deposits are BIFs，skarn deposit and a small amount of magmatic rocks. The BIFs mainly occurred in Archean metamorphic formations including Qianxi，Luanxian and Zhuzhangzi rock groups. Magnetite quartzite as the main iron ore，is output in layered or lentoid structure. The iron deposit geogenesis of BIFs is closely related to submarine volcanic eruption，and the banded ferro and siliceous rhythmic strata stand for the periodic cycles of submarine exhalation. Microorganisms have participated in the deposition of BIFs.