Metallic phases of Dong Ujimqin mesosiderite: A field emission scanning electron microscope study |
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Authors: | Yanhua Mao Daode Wang |
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Affiliation: | (1) Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640 Guangzhou, China |
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Abstract: | The microstructure of Fe-Ni metallic phases in Dong Ujimqin mesosiderite was studied using the field emission SEM. Taenite is characterized by a zoned structure, consisting of outer clear taenite and inner cloudy zone (CZ). CZ has a typical “island-honeycomb” microstructure. The average size of the island phase is about 358 nm, suggesting a cooling rate of ∼ 0.5°C/Ma at low temperature (< 400°C). The Ni concentration profiles across kamacite and zoned taenite were also measured by electron probe microscope analysis (EPMA). Formation of the Fe-Ni metallic phases, microstructure in Dong Ujimqin mesosiderite was discussed based on the new low-temperature Fe-Ni phase diagram. |
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Keywords: | field emission scanning electron microscope Fe-Ni metallic phase microstructure mesosiderite Dong Ujimqin |
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