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新近在我国山西省娄烦县尖山铁矿的角闪片岩中发现一种取向连生的镁铁质闪石与钙质闪石共存对。电子探针分析确定它们分别为铁门石K_(0.001)(Na_(0.027)Ca_(0.073)Mn_(0.031)Fe_(1.801)~(2+)_(1.932)(Fe_(2.948)~(2+)Mg_(1.964)Ti_(0.002)Al_(0.087))_5Si_(8.069)O_(22.10)(OH)_2与铁韭闪石(K_(0.135)Na_(0.461))_(0.596)(Na_(0.088)Ca_(1.853)Mn_(0.005)Fe_(0.072)~(2+))_2(Mn_(0.005)Fe_(2.789)~(2+)Mg_(0.875)Ti_(0.021)Fe_(0.499)~(3+)Al_(0.812))_5(Si_(6.103)Al_(1.897))_8O_(22.00)(OH)_2。共存的两种闪石以共轴取向联生的形式共同组成一个“单晶”,两者间的边界在化学和光学上都是突变的。对比前人所发现的镁铁质闪石与钙质闪石的共存情况,本次所发现的新的共存闪石对,具有更低的镁铁比值和更大的不混溶间隙。
Recently, a coexisting mafic amphibole coexisting with calcareous amphiboles was found in the hornblende fragments of the Jianshan Iron Mine, Loufan County, Shanxi Province, China. The results of electron probe analysis showed that they were K_ (0.001) (Na_ (0.027) Ca_ (0.073) Mn_ (0.031) Fe_ (1.801) ~ (2 +) _ (1.932) (0.88) Na_ (0.461) _ (0.596) (Na_ (0.088)) _2_ (0.189) O_ (22.10) (OH) Ca_ (1.853) Mn_ (0.005) Fe_ (0.072) ~ (2 +)) _2 (Mn_ (0.005) Fe_ (2.789) ~ (2+) Mg_ (0.875) Ti_ (0.021) Fe_ (0.499) Al_ (0.812)) _5 (Si_ (6.103) Al_ (1.897)) _8O_ (22.00) (OH) _2. The coexisting two amphiboles coexist in the form of co-axial formation of a “single crystal” Of the boundaries of the chemical and optical mutations are the same.Compared with previous coexistence of mafic amphiboles and calcareous amphiboles, the new coexisting amphibole pairs discovered in this study have lower mafic Ratio and larger immiscible gap.