摘要
牟乳金矿带位于华北克拉通东缘的胶北花岗岩－绿岩地体东部活化区。区内元古宙荆山群绿岩建造是金的矿源层。北北东向断裂为主要控矿构造。金矿床主要为含金硫化物石英脉型。金的成矿作用与一定的构造－热－动力事件相联系。根据成矿特征和物理化学条件，作者进行了成矿构造地球化学实验、实验表明：分散在黄铁矿中的Ａｕ等成矿元素在高温高压（剪）应力作用下，产生活化迁移。金的迁移可以固态纳米金形式及在化学迁移作用下进行。在成矿后期的引张作用微裂隙空间中，富金残余流体中的金以纳米金为核心发生沉淀富集。为解释晶隙金、裂隙金的形成提供了直接微观证据。同时，也提供了合理解释多数金矿床中金品位变化系数不稳定的原因。
Muping-Rushan gold metallogenic belt is located in the activated region of Jiaodong granite-greenstone terrain of eastern margin of North China Craton. Lower Proterozoic Jingshan Groupgreenstone formation is the source bed of the gold mineralization in this region. Spatial distribu- tion of gold deposits is controlled by the NNE faults. Gold ore is geneticall associated with somespecial events of structure-heat-dynamics. Tectonogeochemical experiments were conductedbased on physicochemical conditions of nuneralization. The resuIts indicate that gold and other el-ements, scattered in pyrities were activated and migrated under compressive and/or shear stressat high temperature. The gold may migrate in solid form of micron-size gold or in form of chemi-cal migration. Gold in resldual fluld precipitated and concentrated around a core of micron-sizegold in the microcrack forn1ed by tensile force. The experiments provides direct evluence for theexplanation of the forn1ation of gold between crystals and intracrystal crack and they were alsoaccount for the variation gold grade coefficient in most gold deposits.
出处
《地质找矿论丛》
CAS
CSCD
1998年第1期13-23,共11页
Contributions to Geology and Mineral Resources Research
关键词
金矿床
石英脉型
成矿构造
地球化学
实验研究
Quartz vein type Au deposit tectonogeochemical experiments Muping-Rushan gold ore belt Shandong
