HR: 1330h
AN: V22B-0585    [PDF]
TI: Submicron Mineral Inclusions in Garnet: a Key to Unravelling Otherwise Unrecognized Metamorphic Events
AU: * Yui, T
EM: tfyui@earth.sinica.edu.tw
AF: Institute of Earth Sciences, Academia Sinica, Institute of Earth Sciences, Academia Sinica, Taipei, 115 Taiwan
AU: Chu, H
EM: chuht@linx.moeacgs.gov.tw
AF: Central Geological Survey, Central Geological Survey, P.O. Box 968, Taipei, 235 Taiwan
AU: Hwang, S
EM: slhwang@mail.ndhu.edu.tw
AF: Department of Materials Science and Engineering, National Dong Hwa University, Department of Materials Science and Engineering, National Dong Hwa University, Hualien, 974 Taiwan
AU: Shen, P
EM: pshen@mail.nsysu.edu.tw
AF: Institute of Materials Science and Engineering, National Sun Yat-sen University, Institute of Materials Science and Engineering, National Sun Yat-sen University, Kaohsiung, 804 Taiwan
AB: Mineral inclusions are important in metamorphic petrology because they can often be used to establish prograde portions of the pressure-temperature (P-T) path, earlier P-T histories and tectonic events of metamorphic terranes that might be difficult to derive from host minerals alone. These mineral inclusions generally are micrometers in size and can be studied through careful microscopic observation and electron microprobe analysis. However, if the inclusions are of submicron (i.e., nanometer) size, they cannot be identified by conventional methods and are often overlooked. Such tiny inclusions can now be identified by analytical electron microscopy and have the potential to reveal otherwise unrecognized metamorphic events as demonstrated by us in the examples including (a) submicron polyphase inclusions in garnet of metapelite from the Tananao Metamorphic Complex, Taiwan; (b) nanometer-size alpha-PbO2-type TiO2 in garnet of ultrahigh-pressure gneiss from Erzgebirge, Germany; and (c) diamond-containing multiphase inclusions in garnet of ultrahigh-pressure gneiss from Erzgebirge, Germany and in ultrahigh-pressure garnet-clinproxene-quartz rock from Kokchetav, Kazakhstan.
DE: 3660 Metamorphic petrology
DE: 3670 Minor and trace element composition
DE: 3902 Creep and deformation
DE: 8030 Microstructures
DE: 8110 Continental tectonics--general (0905)
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2003 Fall Meeting