Resource Distribution And Genesis Of Natural Crystalline Graphite In Heilongjiang

Natural crystal graphite mineral is an important non-metallic mineral in China,which is a necessary mineral material for traditional industries and strategic emerging industries.The graphite resources of our country currently is in an embarrassing position: low-priced export graphite materials and high-priced import graphite products.The trade deficit has caused a result: over-exploitation and waste in the natural graphite resources of our country.The largest reserving provinces for crystalline graphite in our country is Heilongjiang province.The ore deposit types are mainly regional metamorphism,whose deposit scale is large.At present,it has been found that graphite deposits and properties is 54,where has three super-large graphite ore deposit.Through figuring the datas of the graphite mines,I found the graphite ore deposits are mainly distributed in Jiamusi block.The regional metamorphic graphite deposit is large-scale and has high-quality minerals,in which the Yunshan graphite deposit is called "the largest graphite deposit in Asia".The ore-bearing strata of crystal graphite mineral is Precambrian meta-morphic rock.Regional metamorphism can reach the amphibolite facies or granulite facies.The occurrence of ore bodies is in occordance with surrounding rock,which expresses they are sedimentated at the same timef.The forms of Graphite deposit are mainly decided by organic carbon which is included in the primary sedimentary strata.The organic carbon turns into the graphite ore body by the regional metamorphism.So the crystal graphite deposit has the characteristic of “stratabound ore deposit”.The high temperature and pressure led by metamorphism makes the organic carbon have a precoterization of the carbon,which makes the organic carbon crystal graphite.The data for analysing of the carbon isotopes of graphite deposits shows it's between-20.8‰ and-17.8‰,which is usually-20‰.The result is exactly the same with modern plant and animal,modern organic matter,oil,coal,asphalt,and the sea organisms,but it is completely different from the limestone and marble.So we can conclude that the carbon source of graphite deposit is mainly from organic carbon of Heilongjiang province.Through the anaiyze of the distribution regulation and metallogenic regulation summed up the graphite deposit prospecting marks is the petrologic symbol and stratigraphic symbol.The key area for the graphite deposit exploration should be the outside of the known mineral.