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一、鑛區地質情況 火燒坪鑛区在大地构造中所处的位置,应屬于川湘凹陷的东北部,区內鑛产主要为宁乡式铁鑛,地层系統自志留系至下三疊系之間,除缺失下泥盆系、下石炭系地层外,其他各紀地层,均有广泛出露。下三疊系以上地层,因浸蝕关系,在区內已剝蝕殆尽。志留系以下地层,則因出露地点距鑛区較远,故不包括在鑛区范圍之內。这些地层絕大部分都屬于海相沉积,只有在中泥盆紀、上泥盆紀初期、下二疊系初期和上二疊系初期才沉积有部分陆相或海陆交替相地
I. Geological Conditions of the Mining Area The location of the Huozhaoping Mining Area in the tectonic setting should belong to the northeast of the Sichuan-Xiangxi Depression. The ore in the area is mainly Ningxiang-type iron ore. The stratigraphic system is from Silurian to the lower Triassic In addition to the Lower Devonian and Lower Carboniferous strata, other strata have been widely exposed. The lower Triassic strata, due to erosion, have been denuded in the area. The Silurian strata below are not included in the mine area due to the location of the outlying area is further away from the mine area. Most of these strata belong to marine sediments. Only in the middle Devonian, the Upper Devonian, the early Lower Permian and the early Permian only some terrestrial or land-sea alternate phase