摘要
江西银山多金属矿床的热液蚀变粘土矿物主要由伊利石组成 ,伊利石主要由流体作用过程中长石的伊利石化形成 ,其结晶度与成矿流体作用密切相关。银山第 1期铅锌银成矿作用 ,水 岩比相对较低 ,成矿流体以孔隙渗透为主 ,溶质迁移慢 ,形成含有少量膨胀层的伊利石 ;第 2期铜金成矿作用 ,水 岩比相对较高 ,流体的运移方式以通道式或裂隙式为主 ,溶质迁移的速度快 ,形成不含膨胀层的伊利石。研究表明成矿作用过程中的伊利石化主要与铅锌银矿化有关 。
The Yinshan poly metallic deposit is a hydrothermal deposit which closely related to the acidic intermediate volcanic subvolcanic rocks in age of Late Jurassic. The clay minerals formed in the hydrothernal alteration mainly consist of illite, which was a result of illitiztion of feldspar during the fluid rock interaction. The crystallinity of illite was closely associated with ore forming fluid flow action. The nature, composition, fluid/rock ratios and fluid flow of ore forming fluid restrict the forming of illite. In first episode of Pb Zn Ag mineralization, the fluid/rock ratios was relatively lower, fluid flow was mainly by pore osmosis, and the solute transported slowly, the illite presenting a little swelling layers. In the second episode of Cu Au mineralization fluid/rock ratio was relatively higher, and fluid flow was mainly through fractures or channel. The solute transported quickly, the illite presenting no swelling layers. The paper suggested that illitization was closely related to Pb, Zn and Ag mineralization, whereas chloritization related to Cu and Au mineralization. The assemblages of clay minerals, the distribution and structural features of illite are indicators of temperature variation, and the type and intensity of hydrothermal alteration are clues to explore Cu, Au or Pb, Zn, Ag mineralizations in the district.
出处
《地质科学》
CAS
CSCD
北大核心
2002年第1期86-95,共10页
Chinese Journal of Geology(Scientia Geologica Sinica)
基金
国家自然科学基金重点项目 (编号 :4973 3 1 2 0 )
面上项目 (编号 :49873 0 2 6)
国家重点基础研究发展规划项目 (编号 :G1 9990 43 2 0 9)资助
