武夷山覆盖区马坑式铁矿层位及找矿方向

马坑式铁矿床是永梅晚古生代坳陷次一级北东向龙漳基底断裂凹陷带内的大型铁矿床.其赋矿层位并不是很清楚, 这影响了找矿工作.在野外地质调查和认真总结前人研究成果的基础上, 探讨了马坑式铁矿的控矿因素, 认为马坑式矿区的褶皱主体为倒转背斜, 而不是背斜的一翼; 经畲组-栖霞组(C₂j-P₁q)及其与上覆文笔山组(P₁w)之间的界面才是马坑式铁矿的赋矿层位, 而不是林西组(C₁l)与上覆经畲组-栖霞组(C₂j-P₁q) 之间的界面; 认为逆冲推覆构造也是重要的控矿因素, 并指出了找矿方向.燕山期逆冲推覆构造是Izanagi板块自南东向北西方向向欧亚板块之下俯冲所产生的结果. 

Strata Hosted Makeng Type Iron Deposits and Prospecting Orientation in the Wuyishan Covered Region

Makeng type iron deposit is a large deposit in the secondary NE-trending Longzhang basal fracture sag zone of the Late Paleozoic depression of Yongmei. The prospecting breakthrough has been hindered due to the fact that we are not very clear about the type of the strata hosted Makeng type iron deposits. On the basis of field investigation and conscientious study of the results of previous researches, this paper explores ore-controlling factors of the Makeng type iron deposit. It is found that the fold in the Makeng mine district is an overturned anticline instead of one limb of the anticline, and that the Yanshanian thrust nappe structure is the results generated by the subduction of Izanagi plate under the Eurasian plate from southeast to northwest. It is suggested that the Jingshe Formation-Qixia Formation (C₂j-P₁q) and interface between the Jingshe Formation-Qixia Formation (C₂j-P₁q) and the Wenbishan Formation (P₁w) are the horizon hosted Makeng type iron deposit, and that the thrust nappe structure is also important ore-controlling factors. In addition, this paper also presents the prospecting direction.