TEM-EELS line scan analysis and the corresponding spectrum results of Fa₇₁ -P75mJ, Fa₇₁ -M150mJ, Fa₁₀₀-P75mJ, and Fa₁₀₀-M150mJ samples. Twenty points were sampled on Fa₇₁ -P75mJ and Fa₇₁ -M150mJ samples, and fifteen points were sampled for Fa₁₀₀-P75mJ and Fa₁₀₀-M150mJ samples. Analysis points of the samples are shown in the top row, and the corresponding Fe L_3,2 TEM-EELS data for samples and standard references are shown in the bottom row. Images (a) and (e) Fa₇₁ -P75mJ; (b) and (f) Fa₇₁ -M150mJ; (c) and (g) Fa₁₀₀-P75mJ; (d) and (h) Fa₁₀₀-M150mJ. The standard references show that Fe²⁺ and Fe³⁺ have distinct edge shapes and peak positions at 706.2 eV and 708 eV, respectively. The TEM-EELS line scan shows that the Fe in olivine and the matrix existed as Fe²⁺, and no evidence of Fe³⁺ was found.