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通过对大兴安岭中南段花岗岩中的黑云母进行成分测定、差热分析及红外光谱研究,对黑云母的差热曲线即DTA曲线中的吸热谷进行了解释。得出的结论是:黑云母在加热过程中分两次脱羧,一次脱羧Mg-OH键断裂,造成DTA线中的600℃左右的吸热谷;二次脱羟Fe-OH键断裂,形成850~1100℃间的吸热谷;DTA线中最后一个吸热谷为黑云母熔化吸热而成,其温度范围为1100~1300℃。
Through the determination of biotite in the granites in the central-southern Daxing’anling, differential thermal analysis and infrared spectroscopy, the differential thermal curve of biotite, ie, the endothermic valley in DTA curve, is explained. The conclusion is drawn as follows: During the heating process, biotite decarboxylates twice, one decarboxylation of Mg-OH bonds breaks, resulting in an endothermic valley of about 600 ° C in the DTA line; the second decarboxylation of Fe-OH bonds ruptures to form 850 ~ 1100 ℃ between the endothermic valley; DTA line in the last endothermic valley is made of biotite melting endothermic, the temperature range of 1100 ~ 1300 ℃.