Most of China's rare earth deposits with rare element symbiosis, deposit formed in the long historical period from yuan archean to Mesozoic, in am - Inner Mongolia, east qinling, black, liao glue, south China, such as kang dian mineralization zones have different degree of distribution. The basic situation of space-time distribution of rare earth deposits is:
Precambrian is an important mineralization period of rare earth deposits. For example, baiyun ob-niobium and rare earth deposit located in the mineralization area of Inner Mongolia is a rare and rare rare rare rare earth deposit in the world. According to zhong-xin yuan and so on in recent years the study of baiyun obo ore deposit metallogenic era show that rare earth mineralization mainly occurs in middle proterozoic, roughly between 1400 ~ 1600 ma (ore deposit geology, 1991, №. 1), the ore is formed by way of deposit. During the caledonian period, the second mineralization of rare earth was caused by the magma of alkaline carbonate rocks and the possible intrusion of some alkaline gabbro magma. During the hercynian period, along with the intrusion of granite magma in the south of the mining area, the original deposit was reshaped, and there was a new late stage of rare earth minerals.
The rare and rare earth deposits formed in the caledonian period are mainly distributed in northern and western northern rock bands, such as qinling area and kunlun - qilian mountains. The deposit type is dominated by pegmatite, and the mineralization scale is small.
In addition, phosphorus and rare earth elements are commonly found in the ordovician system of Cambrian in southern guangxi province. In the process of mixed lithification, rare earth elements are enriched to form a mixed rock type rare earth deposit.
Hercynian in hinggan mountains - Inner Mongolia area, altay area, qilian mountain tianshan north minery, kunlun, east qinling area, south China area, kang dian area and black ji liao glue area are hercynian zone exists, forming many rare, rare earth ore deposit scale range.
In the indo-china period, it is only found in the west sichuan province that the large scale lithium pyroxite deposit and the altai area of the altai region of xinjiang are located in the calumute-sodium feldspar pegmatite deposit. However, large scale rare earth deposits have not been found.
Yanshan epoch is rare in our country, the main metallogenic period of rare earth mineral deposits, especially in mining area of southern China into many granite, pneumatolytic hydrothermal type and hydrothermal type, pegmatite type, alkaline and alkaline granite rock type, volcanic hydrothermal type, such as rare, rare earth deposits, mostly in the yanshanian mineralization. In addition, the research on the rare earth deposits of yak ping in the mianning area of sichuan province is in the Himalayan period (yuan zhongxin et al., 1995).
The changes of rare earth and yttrium minerals in rare earth deposits of different genetic types have certain regularity. In the magmatic deposit related to alkaline-ultrabasic magma, it mainly forms the combination of cerium rare earth minerals. In the mineral deposits related to acid magmatism, yttrium mineral assemblage is mainly formed. In the pegmatite deposit, the alkaline pegmatite deposit mainly forms the combination of cerium rare earth minerals. Granite pegmatite mainly forms a combination of yttrium rare earth minerals. In hydrothermal deposit, cerium rare earth fluorocarbon mineral assemblage is mainly formed.
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