金从热液中沉淀的机制

THE DEPOSITION MECHANISM OF GOLD FROM HYDROTHERMAL SOLUTION

影响金从热液中沉淀的物理化学因素有温度、压力、氧逸度、ｐＨ值和形成金的配合物的配体组份的活度。简单冷却作用很难导致金的有效沉淀。引起金从成矿热液中沉淀的主要地质作用有沸腾与相分离、两种流体的混合、流体组份与围岩的化学反应（引起金的配合物的解体）及吸附。

The physico-chemical factors responsible for the deposition of gold from hydrothermal solution are temperature, pressure,oxygen fugacity,pH and the activity of ligand forming gold coordinate compounds. The simple cooling can hardly cause the effective deposition of gold. The major geological processes which can result in gold deposition from hydrothermal solution are attributed to boiling and phase separation, mixture of two kinds of fluids, chemical reaction of ore-forming fluid with the host rocks and absorption.