碱性长石中Fe^(3+)在四面体位置间交换动力学的EPR研究  

EPR STUDY ON EXCHANGE KINETICS OF FE^(3+) OVER THE TETRAHEDRAL POSITIONS IN ALKALI FELDSPAR

作　　者：富毓德 Ivan Petrov S.S.Hafner 

机构地区：[1]中国科学院地球化学研究所 [2]联邦德国马尔堡大学矿物学与结晶学研究所

出　　处：《矿物学报》1989年第2期97-103,共7页Acta Mineralogica Sinica

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Fe^(3+)、Al^(3+)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Fe^(3+)线被加宽,当温度为800℃时,除T_1(o)位置外,没有出现其余四面体位置Fe^(3+)产生的谱线。透长石在1050℃加热1300h后,T_1和T_2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Fe^(3+)、Ak^(3+)和Fe^(3+)、Si^(4+)交换与Al^(3+)、Si^(4+)交换比较,前者速度要缓慢得多。Under heating conditions the exchange of Fe^(3+) and Al^(3+) 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 Fe^(3+) lines exhibited broadening after heating, but no additional lines due to positions other than T_1(o) occurred at 800℃ for 186 hrs. In sanidine, after heating at 1050℃ for 1300 hrs, the relative intensities of T_1 and T_2 lines changed. From the heating experiments it is concluded that Fe^(3+), Al^(3+) and Fe^(3+), Si^(4+) exchange among the distinct T sites in the lattice of alkali feldspar is distinctly more sluggish than Al^(3+) and Si^(4+).

关 键 词：长石 碱性 FE^3+ 动力学 EPR法 

分 类 号：P578.968[天文地球—矿物学]