摘要
在200—550℃和60MPa条件下,以氯化物溶液对绿岩中金进行了淋滤实验,部分实验控制了氧逸度。实验结果显示,金的淋滤率与温度、溶液成分、酸碱度及氧逸度有关。在氧化和酸性溶液的实验中,淋滤率达50％以上。已查明金的淋滤作用受岩石中金溶解形成氯络合物的反应制约。因此,笔者认为花岗岩浆活动派生的酸性氯化物溶液话化迁移了绿岩中的金并富集成矿。
Leaching experiments of gold in greenstone were carried out with chloride solutions at temperatures of 200 to 550℃ and a pressure of 60 MPa. Oxygen fugacity was controlled by HM oxygen buffer for some experiments in order to examine the role of oxygen fugacity on the leaching.
Experimental results show that the leaching rate depends on the composition, acidity, oxygen fugacity and temperature of the solutions. Low pH values, high oxygen fugacity and elevated temperatures are favourable for leaching out of gold from the rocks. The leaching rate attains 50% or more in runs with oxidative and acid chloride solutions.
The leaching is controlled by the dissolution process of gold chloride complexes. Thus the authors suggest that acid chloride solutions genetically related to the granitic magmatism is responsible for the remobilization of gold from the source greenstone and gold concentration.
出处
《地质学报》
EI
CAS
CSCD
北大核心
1992年第4期362-370,共9页
Acta Geologica Sinica
基金
国家自然科学基金(4870204)
地质行业科技发展基金
关键词
淋滤作用
金矿床
绿岩
Leaching, gold deposits, greenstone
