North China in the western margin of a major Precambrian geological events

Title: North China in the western margin of a major Precambrian geological eventsAuthor: Gong RuijunDegree-granting units: Chengdu University of TechnologyKeywords: North China margin of;; Precambrian;; geological eventsSummary:

Western margin of North China is a country in Precambrian strata exposed one of the more complete, this area has been found in Precambrian strata there are many important output of mineral resources, such as copper, lead, zinc, gold and rare earth elements Neodymium magnets and other metal mineral resources. China Nuclear Industry Geological Bureau based on a research project "in the western part of North China margin of the Precambrian uranium ore-forming conditions and prospecting direction", the author produced in North China by the western margin of Precambrian strata in the special Large deposits of large-scale geological features of the analysis and isotopic data, that the existence of four major geological events, are Neoarchean geological events (> 2500Ma), Paleoproterozoic geological events (2500 ~ 1800Ma), Mesoproterozoic geological events (1800 ~ 1000Ma) and the Paleozoic - Mesozoic geological events (543 ~ 65Ma).

(1) Archean geological events mainly 2700Ma mafic volcanism, 2500Ma in acidic magmatism and the development of extensive and intense metamorphism; this period mainly formed Archean granite - greenstone belt of gold deposits, of banded iron deposits, as well as high-grade metamorphic rocks of the graphite deposits.

(2) Paleoproterozoic major geological event occurred in 2350 ~ 2100Ma and 2100 ~ 1800Ga during orogenic events during the acid with a large number of granitic magma activity of the Archean granite-greenstone belt overlay transformation, substances into gold, forming gold deposits Paishanlou; Proterozoic lead-zinc mineralization is an important period, the region Caijiaying the formation of Pb-Zn deposits with the period of construction is closely related to thermal events.

(3) Mesoproterozoic geological events are the most important metallogenic study area events, mainly for the early Proterozoic (1800Ma ~ 1300Ma) north of the ancient continental breakup event and the late Mesoproterozoic (1300Ma ~ 1000Ma) convergence event, and the formation of the Wolf - aulacogen residue Altay Mountains and the Bayan Obo aulacogen two aulacogen. Produced a large number of Proterozoic large deposits, such as Nb deposit Bayan Obo rare earth iron, Wolf - sulfur residue Altay Mountain polymetallic mineralization belt, high-plate River lead and zinc - pyrite ore, ferro-vanadium deposits in Temple , and manganese ore beds.

(4) Paleozoic - Mesozoic geological event is mainly on the substrate before the formation of structural transformation, cracking put together, accompanied by intense magmatism and mineralization associated with the intrusion, especially in the Hercynian and http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php Yanshanian magmatic activity extremely frequent. The formation of Dongping gold deposit, gold deposits and other cliff valley ear.

Precambrian strata in the study area of ​​gold, copper, lead and zinc, manganese, iron ore, rare earth minerals and other deposits are affected by regional faults and magmatic belt control. In addition to Xing and graphite mine only by Precambrian regional metamorphism affected. Mineral Deposits has a multistage, additive, especially in gold deposits.Degree Year: 2010