摘要
碾子山晶洞碱性花岗岩的δD与H_2O含量非常低且呈近于直立的正相关关系,这是开放体系岩浆去气作用的典型特征。采用去气方程对碾子山花岗岩进行拟合,得:1n(δD+1000)=(0.0182±0.0226)1nF+(6.8189±0.0224)。这表明对该岩体而言逸出水分子与岩浆水间的D/H分馏系数为1.0182左右;初始δD为-85‰左右,基本位于正常岩浆水范围。研究表明,岩浆去气作用是我国东部晶洞碱性花岗岩的共同特征。
The 6D values and H2O contents of the Nianzishan miarolitic alkaline granite are very low with a nearly vertical relationship. It is a typical characteristic of the open-system degassing. The ln(δD+1000) = (0.0182±±0.022(J)1nF+(6.8189±0.0224) can be fitted by the degassing equation. This means that the D/H fractionation factor for escaped water and magma water is equal to 1.0182. The initial 6D of the magma was estimated at -85%0, falling within the δD range of normal magma water. The open-system magma degassing is a common feature of the miarolitic alkaline granite in East China.
出处
《地球化学》
CAS
CSCD
北大核心
1992年第1期70-76,共7页
Geochimica
基金
国家自然科学基金4860074号
