摘要
本文报道了一项用喇曼光谱方法直接测定淬火高温氯化物溶液中金氯配合物形式的研究成果。实验结果表明:在100MPa和450℃以上实验后的淬火溶液中存在Au(Ⅲ)和 An(Ⅰ)的金氯配合物,虽然高温时[AuCl_2]^-配合物的稳定性显著增加,但[AuCl_4]^-在500℃的溶液中仍是存在的,只是其结构形式可能有所改变。本实验的物理化学参数(300—500℃,100MPa及0.1—1mol NaCl溶液)接近天然热液金矿的成矿条件,因此,有理由认为Au(Ⅰ)和Au(Ⅲ)的两种配合物均对热液成矿过程中金的活化迁移起了重要作用。
Direct Raman spectroscopic evidence is presented for the structural forms of Au-Cl com-plexes in quenched high-temperature chloride solutions. It is ascertained that both Au(Ⅲ)and Au(Ⅰ) chloride complexes are present in quenched chloride solutions, as obtained fromexperiments at 100 MPa and above 450℃. It is suggested that [AuCl_4]^- still exists in a pro-bably distored structural form at>500℃, though the stability of [AuCl_2]^- increases with tem-perature. The physico-chemical parameters of our experiments are: 300--500℃, 100 MPa and0.1--1 mol/L. NaCl solutions, quite similar to the forming conditions of hydrothermal goldores. It is reasonable that the complexes of Au(Ⅲ) and Au(Ⅰ) may be responsible for goldtransport during hydrothermal ore deposition. This study has proved that the quenching method is useful for the Raman spectroscopicdetermination of the speciation of ore metals in high-temperature solutions.
出处
《地球化学》
CAS
CSCD
北大核心
1993年第1期45-54,共10页
Geochimica
基金
国家自然科学基金与地质行业科技发展基金联合资助4870204项目
