【摘要】 在加热条件下,利用EPR方法研究了碱性长石中不同四面体位置间的Fe³⁺、Al³⁺交换。低温钠长石和透长石晶体分别在水热,1 kbar,500—900℃和干加热,1050℃条件下加热。在低温钠长石中,加热后Fe³⁺线被加宽,当温度为800℃时,除T₁（o）位置外,没有出现其余四面体位置Fe³⁺产生的谱线。透长石在1050℃加热1300h后,T₁和T₂线的相对强度发生了变化。实验表明,在碱性长石中不同四面体间Fe³⁺、Ak³⁺和Fe³⁺、Si⁴⁺交换与Al³⁺、Si⁴⁺交换比较,前者速度要缓慢得多。更多还原

【Abstract】 Under heating conditions the exchange of Fe³⁺ and Al³⁺ over the tetrahedral positions in alkali feldspar has been studied using EPR. Crystals of albite and sanidine were heated under hydrothermal conditions at 1 kbar between 500 and 900℃ and under dry conditions at 1050℃, respectively. In albite, the Fe³⁺ lines exhibited broadening after heating, but no additional lines due to positions other than T₁（o） occurred at 800℃ for 186 hrs. In sanidine, after heating at 1050℃ for 1300 hrs, the relative intensities of T₁ and T₂ lines changed. From the heating experiments it is concluded that Fe³⁺, Al³⁺ and Fe³⁺, Si⁴⁺ exchange among the distinct T sites in the lattice of alkali feldspar is distinctly more sluggish than Al³⁺ and Si⁴⁺.更多还原