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Microstructures of peridotites from the Mount Melbourne, Antarctica

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Microstructures of peridotites from the Mount Melbourne, Antarctica
Other Titles
남극 멜버른화산에서 가져온 감람암의 미구조
Kim, Daeyeong
Park, Moonjae
Michibayashi, Katsuyoshi
Park, Yongcheol
Lee, Mi Jung
Seo, Junghun
Issue Date
Kim, Daeyeong, et al. 2019. Microstructures of peridotites from the Mount Melbourne, Antarctica. International Symposium on Antarctic Earth Sciences. Incheon. 2019.07.22~2019.07.26.
Microstructures of mantle xenoliths are investigated to understand internal structure and evolution of mantle beneath the Mt. Melbourne, Antarctica. Massive peridotites are characterized by abundant undulose extinction of olivine, bent cleavage traces of orthopyroxene and interstitial spinel. Chemical compositions of spinel and olivine suggest the low degree of melting. The olivine CPOs of six peridotites are acquired by rotation of [100] and [010] to be paralleled to lineation and foliation, respectively, after EBSD analysis. The CPOs of the analyzed olivine in peridotites are subdivided into D- and A-type based on Fabric Index Angle (FIA) methods (Michibayashi et al., 2016, EPSL). Temperature and pressure conditions are calculated as >900 °C and >9 MPa by two-pyroxene thermometer and grain size piezometer, respectively. Absent water content in olivine detected by FTIR is concordant with results of the FIA analysis. Abundant intracrystalline deformation features combined by low degree of melting may suggest the existence of partial melting beneath the West Antarctic Rift System. Therefore the occurrence of low-velocity zone beneath the Mt. Melbourne can be explained by seismic anisotropy of olivine in the massive peridotites.
Conference Name
International Symposium on Antarctic Earth Sciences
Conference Place
Conference Date
Appears in Collections  
2019-2019, Characterizing mantle domain beneath West Antarctic Rift System and Antarctic mid-ocean ridges (19-19) / Park, Yongcheol (PE19050)
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