摘要
硅化岩型金矿赋矿地层主要为下石炭统大哈拉军山组酸性火山灰凝灰岩段；含矿岩石主要为硅化凝灰质砾岩和硅化凝灰岩；具有低品位、大矿量、埋藏浅、层控性明显的特点；成矿期分为原生沉积富集、水热交代蚀变、表生氧化淋滤三期；包裹体少而小，以液相成分为主，气液比５％～１０％；成矿流体以大气降水为主，含有少量岩浆水，盐度Ｎ／ｗ（ＭａＣＩ）＝０．３９％， ｐＨ值５．５， Ｅｈ值－０．８～１．２ Ｖ；成矿温度８８℃～９８℃，成矿压力５９×１０ Ｐａ，成矿深度２３０ ｍ左右，属浅成低温水热系统金矿。
The silicified-rock-type gold deposits are hosted in silicified tuffaceous conglomerate and silicified tuff, which are part of the Acidic-Ash-Tuff Formation of the Lower Carboniferous Dahalajunshan Group.They are characterized by low grade, large reserve, near surface and strata-bound.The generalization can be divided into three metallogenic stages: primary sedimentary concentration, hydrothermal alteration and epigenetic oxidation and leaching. Fluid inclusion, although it is rare and tiny, studies show that the liquid phase is dominant with gas/liquid phase from 5% to 10% ,The ore-forming fluid is commonly meteoric water, and with minor magmatic water. The salinity is No.39wt% NaCI, pH=5.5 and Eh=-0.8-1.2 V.The metallogenic temperature(T) is 88°-98°, Pressure (P)=59×10 Pa and Depth (H)=230 m.It is concluded that the silicified-rock-type gold deposits are formed by an epithermal system.
出处
《新疆地质》
CAS
CSCD
2000年第1期42-50,共9页
Xinjiang Geology
