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一、区域地质背景 马坑式铁矿床主要分布于我国闽西南和粤北地区。在大地构造位置上,闽西南地区位于闽粤海西—印支断陷带的北段(通称“永梅拗陷”),东邻浙闽粤中生代断陷带,西畔武夷隆起,南近广东梅县,北为闽西北隆起(图6)。闽粤断陷带是在华南加里东地槽褶皱基底上发育的、主要由上古生界组成的海西期断陷。闽西南地区“马坑式”铁矿主要赋存于闽粤断陷带东侧的大田—龙岩复向斜内。
First, the regional geological background Ma Hang-type iron deposits are mainly distributed in China’s southwestern Fujian and northern Guangdong. At the tectonic location, the southwestern Fujian region is located in the northern segment of the Hercynian-Indosinian fault zone in Fujian and Guangdong Provinces (commonly known as “Yongmei Depression”), with the Mesozoic-Cenozoic Zhejiang-Fujian-Guangdong Depression, Guangdong Meixian, north of Fujian Northwest uplift (Figure 6). The Min-Yue fault zone developed on the gabbro basement of the Galiadong in southern China and consists mainly of the Hercynian fault depression of the Upper Paleozoic. The “Ma Hang-type” iron ore in the southwestern part of Fujian Province mainly occurs in the Dada-Longyan synclinorium on the east side of the Min-Yue Depression Zone.