黑龙江省浅成低温金矿床成矿地质特征及矿床成因

对发育在黑龙江省陆相火山岩区的主要金矿床的矿床地质特征、成矿流体和稳定同位素、稀土元素地球化学特征的归纳与总结，得出：该类型矿床属于典型的冰长石-绢云母化蚀变：δ^18O水 集中在-14．11‰～6．23‰，δD值在-78．25‰～-132．64‰，显示成矿流体以大气降水为主，有少量的岩浆水；δ^34S 多数集中在-3．1‰～4．6‰，稍正向偏离陨石硫的特点，^206Pb／^204Pb 为17．742～18．758，^207Pb／^204Pb为15．287～15．760，^208Pb／^204Pb 为37．414～38．616，显示成矿物质应主要来自于深部幔源物质的岩浆热液流体系统；稀土元素配分曲线显示，金矿体与赋矿围岩等有密切的关系，但稀土总量明显偏低，形态更趋复杂，显示了成矿物质来源的复杂性；成矿时代多集中在100～118Ma，多为早白垩世；流体包裹体均一值集中在150～280℃，盐度集中在1．2％～8．36％，成矿压力为4～19．6MPa，估算成矿深度为0．13～0．65km；显示为典型的浅成低温热液型金矿床的特点。

Geological characteristics and genesis of the epithermal deposits in Heilongjiang Province

The paper summarizes the geological characteristics, ore-forming fluids, stable isotopes and REE geo- chemical characteristics of main gold deposits developed in continental volcanic rocks district in Heilongjiang Prov- ince. Based on that, several conclusions are reached. The deposits belong to adularia-sericite alteration ; δ^18 O value ranges between 14.11‰ and 6.23 ‰ and δD values between -78.25 ‰ and - 132.64 ‰, indicating that the main ore-forming fluids are meteoric water with a small amount of magmatic water;δ34S mainly ranges between -3.1‰ and 4.6 ‰, showing a slightly positive deviation from the characteristics of sulfur in meteorites; with ^206Pb/^204Pb = 17. 742 - 18. 758,^207Pb/^204Pb = 15. 287 - 15. 760 and 2^204Pb/^204Pb = 37. 414 - 38. 616, it shows that the metallogenic materials should come from the magmatic hydrothermal fluid system in deep mantle; REE distribution shows a close relation between gold orebody and wall rocks, but total REE content is significantly lower and more complex, indicating the complexity of the metallogenic source; the deposits mainly date back to 100 -118 Ma in early Cretaceous; The homogenization temperatures are from 150 to 280 ℃, salinity 1.2 % -8.36 % （NaCl） ,the ore-forming pressure 4-19.6 Mpa; and estimated ore-forming depth around 0.13 -0.65 kin. All of.the above suggest typical characteristics of epithermal gold deposits.