The Mn-Fe negative correlation in olivines in ALHA 77257 ureilite
作者： M. Miyamoto , T. Furuta , N. Fujii , D. S. McKay , G. E. Lofgren
DOI: 10.1029/92JE02943
关键词: Analytical chemistry 、 Ureilite 、 Manganese 、 Electron microprobe 、 Meteorite 、 Achondrite 、 Pyroxene 、 Olivine 、 Mineralogy 、 Redox 、 Geology 、 Earth-Surface Processes 、 Ecology (disciplines) 、 Earth and Planetary Sciences (miscellaneous) 、 Space and Planetary Science 、 Palaeontology 、 Forestry 、 Aquatic science 、 Atmospheric Science 、 Soil science 、 Geochemistry and Petrology 、 Geophysics 、 Oceanography 、 Water Science and Technology
摘要: Mn, Fe, and oxygen zoning profiles of olivines in the ALHA 77257 ureilite were measured by an electron probe microanalyzer to study effects reduction on Mn-Fe value, because exhibit thin reduced rims. The Mn content gradually increases toward rim as Fa (=100 × Fe/(Mg + Fe), mol %) component decreases, which suggests that olivine is related redox conditions. A calculated diffusional cooling rate 1–2°C/h gives best fit both observed MnO chemical 77257. results melting experiments suggest negative correlation low-Ca pyroxene positive temperature. Fe/Mn-Fe/Mg trend cores ureilites may be established process at about 1275°C.
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