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Shock-produced zones in meteorite Elga, the member of IIE irons with silicate inclusions, were investigated with EMPA, SEM, Raman spectroscopy and TEM. The results demonstrate the occurrence of extraterrestrial siderite and amorphous sp2 carbon in shocked zones of meteorite Elga. The CO2 involved in shock-induced reactions could have been trapped by silicate target from the atmosphere during impact. This scenario seems reasonable because during shock wave propagation through the rock, cracks and fissures within the rock can trap components of the atmosphere. If so, then Mars can be a potential candidate for a parent body of Elga.