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利用穆斯堡尔谱仪对辽宁宽甸地幔岩包体中的矿物进行了三价铁的测定,测试结果与国内外已发表的数据接近。Fe3+/∑Fe比值分别为:斜方辉石0066~0196,单斜辉石0216~0344,尖晶石0283~0299,石榴石0057~0223。依据电价平衡原理计算的Fe3+含量受Si4+、Al3+和Cr3+的电子探针分析误差影响很大。根据地幔矿物的电子探针分析结果计算平衡温度、压力和氧逸度时,二辉石En、Ca转移反应温度计和石榴石斜方辉石Al压力计的计算结果不超过温压计的一般误差范围,而石榴石单斜辉石Fe2+Mg交换反应温度计在忽略Fe3+时计算的温度值可偏高100℃以上;采用橄榄石/斜方辉石/尖晶石组合氧压力计计算的氧逸度值,误差一般约在±07个对数单位。
The Mossbauer spectroscopy was used to measure the ferric iron in the mineral inclusions of the mantle plume in Kuandian, Liaoning Province. The test results are close to the published data at home and abroad. Fe3 + / ΣFe ratios are respectively: orthopyroxene 0066 ~ 0196, clinopyroxene 0216 ~ 0344, spinel 0283 ~ 0299, garnet 0057 ~ 0 223. The calculated Fe3 + content based on the principle of electricity price is greatly affected by the error of electron probe analysis of Si4 +, Al3 + and Cr3 +. Calculations of the equilibrium temperature, pressure, and oxygen fugacity based on the results of electron probe analysis of mantle minerals do not exceed the general error of the piezometer for the calculations of the diopside En, Ca transfer thermometer and garnet orthorhombic Al manometer Range, and the calculated temperature of garnet clinopyroxene Fe2 + Mg exchange reaction thermometer ignoring Fe3 + can be higher than 100 ℃. The oxygen fugacity calculated by olivine / orthopyroxene / spinel combined oxygen pressure gauge , The error is generally about ± 0.7 logarithmic units.