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通过室内对含铵伊利石粘土岩样品加热处理,利用DTA、XRD、FTIR、氮元素分析等方法研究了铵伊利石的热稳定性,发现铵伊利石矿物中的氮含量随温度的升高而逐渐降低。铵伊利石矿物晶格结构在500℃之前,具有稳定性,层间的N表现为缓慢释放的特征。在500~600℃温度区间,层间N的释放速率加剧。600℃开始向半晶质化方向发展,700℃以上晶格结构破坏,层间NH4+消失。加热到700~800℃高温相中,仍残留有0.3%~0.5%的氮,这表明矿物中的N在高温下通过与Si、A l和O原子化学结合,仍具有比较高的相对稳定性。本研究对于认识地球系统幔源物质演化、运移、分异、脱气作用和氮循环等具有重要理论意义。
The thermal stability of ammonium illite was studied by indoor heat treatment of ammoniated illite clay, and the thermal stability of ammonium illite was investigated by DTA, XRD, FTIR and nitrogen elemental analysis. It was found that the nitrogen content of ammonium illite mineral increased with the increase of temperature Gradually decreases. Ammonium illite mineral lattice structure before 500 ℃, the stability of the inter-layer N showed a slow release characteristics. In the temperature range of 500 ~ 600 ℃, the release rate of interlayer N aggravates. 600 ℃ began to develop toward the direction of semi-crystalline, 700 ℃ above the destruction of the lattice structure, interlayer NH4 + disappeared. Heating to 700-800 ° C in the high temperature phase still retains 0.3% ~ 0.5% of nitrogen, indicating that the mineral N at high temperatures by Si, Al and O atoms chemically bonded still has a relatively high relative stability . This study is of great theoretical significance for understanding the evolution, migration, differentiation, degassing and nitrogen cycling of mantle-derived matter in the Earth system.