| Oxidation Experiment of Natural Megacrystal Ch'nopyroxene: Implications for Assignment of Mossbauer Spectra |
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| 作者姓名： | ZHI Xiachen CHEN Peng |
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| 作者单位： | ZHI Xiachen，CHEN PengDepartment of Earth and Space Sciences，University of Science and Technology of China; Laboratory of Chemical Geodynamics，USTC; Advanced Research Center for Earth Science and Astronomy in USTC，Third World Academy of Science，Hefei 230026 LIN Chengzhong，CHEN Shuqing，ZHANG GuilanInstitute of Mineral Resources，Chinese Academy of Geology Sciences，Beijing 100037LI Yuzhi and LIN Lei Open Laboratory of Structure Analysis，USTC，Hefei 230026 |
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| 摘 要： | The Mossbauer spectra of natural megacrystal clinopyroxene are usually fitted by 4 sets of symmetric doublets, A-A', B-B', C-C' and D-D', respectively, in terms of increasing Qs value in literature. But the assignments of those doublets are quite different, except the D-D' doublet assigned to Fe3+ at the lattice site Ml in previous papers. Particularly, the assignment and interpretation of the C-C' doublet are diverse.The oxidation experiments of natural megacrystal clinopyroxene collected from the Hannuoba basalt, North China, were performed under controlled conditions of temperature at 1000℃ and oxygen fugacity of FMQ buffer in 1, 2, 3 and 5 days respectively. The oxidized samples were then measured by X-ray diffraction spectrometry and Mossbauer spectrometry. The oxidation of clinopyroxene is characterized by Fe2+→ Fe3+ at Ml under the subsolidus conditions, which is consistent with the increase of the area of the D-D' doublet when the heating time increases. Accordingly, the area of the A-A' and B
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Oxidation Experiment of Natural Megacrystal Ch'nopyroxene: Implications for Assignment of Mossbauer Spectra |
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| Authors: | ZHI Xiachen CHEN Peng |
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| Institution: | ZHI Xiachen,CHEN PengDepartment of Earth and Space Sciences,University of Science and Technology of Chin,Laboratory of Chemical Geodynamics,USTC,Advanced Research Center for Earth Science and Astronomy in USTC,Third World Academy of Science,Hefei LIN Chengzhong,CHEN Shuqing,ZHANG GuilanInstitute of Mineral Resources,Chinese Academy of Geology Sciences,Beijing LI Yuzhi and LIN Lei Open Laboratory of Structure Analysis,USTC,Hefei |
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| Abstract: | |
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| Keywords: | megacrystal clinopyroxene Mossbauer spectrum oxidation experiment anomalous doublet |
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