δ~(18)O CONTOURS AND ANCIENT FOSSIL HYDRO-THERMAL SYSTEM OF MIAROLITIC ALKA-LINE GRANITE,NIANZISHAN,HEILONGJIANG

The H and O isotope compositions of 41 whole rocks and 24 separated minerals of theNianzishan miarolitic alkaline granite and 3 local meteoric water samples have been meas-ured. The results indicate that the meteoric-hydrothermal convective system might have beendeveloped in this stock. The distributions of δ~(18)O values of whole-rock samples formed anapproximateIy δ~(18)O contours with the characteristic of kighest values in the midst and de-creasing toward the outer zones. The water/rock ratio (W/R) contours were also calculated.This phenomenon might have common significance for stocks or plutons.     

黑龙江碾子山晶洞碱性花岗岩δ~(18)O等值线与古化石热水体系研究

本文分析了碾子山晶洞碱性花岗岩体41个全岩、24个单矿物及当地大气降水的H,O同位素组成,所得结果说明该岩体明显经历过大气降水-岩石相互作用。将全岩样品的δ~(18)O值全部投在地质图上,可画出δ~(18)O内高外低的等值线。计算的水/岩比(W/R)构成形状一致但呈内低外高现象的等值线图,这一现象可能具有普遍意义。