中国北东部系指华北、东北及豫、鲁、苏、皖十省(区).在其广泛分布的前震旦纪变质岩系中,普遍有中、基性火山岩层(绿岩带),后者金丰度值显著偏高,为特有的金地球化学区.这些地区自下元古代至中生代曾经多次构造运动与造山旋回,遭到变质作用、混合岩化作用以至花岗岩化作用,形成变质岩、混合岩或混合花岗岩甚至形成再生 North-eastern China refers to the provinces of North China, Northeast China and Henan, Shandong, Jiangsu and Anhui provinces. In its widely distributed Pre-Sinian metamorphic series, there are generally intermediate and basic volcanic formations (greenstone belts) The gold abundance value is obviously high, which is a unique gold geochemical zone.These areas from the Proterozoic to the Mesozoic have repeatedly tectonic movement and orogenic cycle, metamorphism, migmatization and even granitization, forming metamorphism Rock, mixed rock or mixed granite even form a regeneration