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闽西南地区的铁矿床,主要分布在闽粤海西-印支断陷带北段(即永梅拗陷)的东部。目前已知,马坑、洛阳等铁矿区都有一套早、中石炭世中基性火山岩。闽西南其它地区和粤东一些铁矿区也同样如此。这些火山岩的分布与马坑式铁矿的含矿层位基本一致,与成矿关系显得极为密切。但由于后期地质作用的影响,这套岩石的外貌发生了不同程度的变化,有的甚至难于辨认。因此,在工作的初期,对这套岩石是否火山岩,马
The iron deposits in southwestern Fujian are mainly distributed in the eastern part of the northern section of the Hercynian-Indosinian fault zone in Fujian and Guangdong (ie, Yongmei Depression). It is known that there are a set of early and middle Carboniferous base volcanic rocks in Ma Hang and Luoyang and other iron ore mines. The same applies to other areas in southwestern Fujian and some iron mines in eastern Guangdong. The distribution of these volcanic rocks is basically consistent with the ore-bearing beds of the Makeng-type iron mine and the relationship with the mineralization is extremely close. However, due to the influence of later geology, the appearance of the rock has changed in varying degrees, and some are even difficult to identify. Therefore, at the beginning of the work, whether this set of rocks is volcanic, horse