Metallogenic regularity of iron ore
Iron ore deposit is mainly produced in Liaoning, Hebei, Shandong, Henan, Anhui and other places of Archean Anshan group, Qianxi group, Taishan group, Huo Qiuqun and metamorphic rocks of Dengfeng group, the equivalent in different layers; Shanxi, Inner Mongolia five Taiwan group, Lower Proterozoic metamorphic rocks and Lv Liangqun quite, most belong to the metamorphism greenschist to amphibolite facies and granulite facies in the individual. The provinces of Hunan, Jiangxi and so on are formed in stream group or Sinian group. The iron bearing metamorphic rocks in most areas are affected by varying degrees of mixing and mineralization.
Metamorphosed iron and siliceous forming iron depositsThe typical iron ore deposits are distributed in the Anshan Liaoning Benxi area, so they are generally called "Anshan style" iron ore. These types of iron deposits are metamorphosed by varying degrees of regional metamorphism and are associated with the formation of volcanic iron - siliceous sedimentary deposits. Roughly with foreign Algoma type iron ore is. Mainly formed in the Precambrian (mostly concentrated in 2000 ~ 3000Ma) old metamorphic rocks.
In different periods, under similar geological conditions, can form iron ore deposits of the same type; but in different periods of the geological and tectonic movement period, the dominant iron ore deposit type is different, showing the formation and evolution of the crust is closely related to the characteristics of iron ore deposit. From the old to the new, the following main types of iron ore deposits and metallogenic regularity of different geological periods: the iron ore deposits and metamorphosed sedimentary iron ore deposits mainly occur in Precambrian (Archean and Proterozoic) ancient regional metamorphic rocks, China is very important iron ore types, the reserves the total reserves of 57.8%. And it has the characteristics of large, poor, shallow, easy (optional), that is, large ore deposits, low iron content, ore bodies exposed, surface or shallow, easy to choose. Mainly distributed in southeastern Jilin, Liaoning - Benxi, Jidong, Beijing, Miyun, northern Shanxi, southern Inner Mongolia, Henan, China, Lu Zhong, Northwest Anhui, Jiangxi, Xinyu, Shaanxi, Hanzhoung and hunan. According to the type of ore in the ore deposit and the mineral and mineral assemblage of the ore bearing metamorphic rock series and other geological characteristics, they are divided into the following two categories.
