CARBON ISOTOPE ANALYSES OF INDIVIDUAL HYDROCARBON MOLECULES IN BITUMINOUS COAL, OIL SHALE, AND MURCHISON METEORITE

  • Kim, Kyoung-Sook (Department of Physics, Center for High Energy Astrophysics and Isotope Studies(CAIS), Ewha Womans University) ;
  • Yang, Jong-Mann (Department of Physics, Center for High Energy Astrophysics and Isotope Studies(CAIS), Ewha Womans University)
  • 발행 : 1998.06.01

초록

To study the origin of organic matter in meteorite, terrestrial rocks which contain or-ganic compounds similar to the ones found in carbonaceous chondrites are studied and compared with Muchison meteorite. Hydrocarbon molecules were extracted by benzene and methanol from bituminous coal and oil shale and the extracts were partitioned into aliphatic, aromatic, and polar fractions by silica gel column chromatography. Carbon isotopic ratios in each fractions were analysed by GC-C-IRMS. Molec-ular compound identifications were carried by GC-MS Engine. Bituminous coal and oil shale show the organic compound composition similar to that of meteorite. Oil shale has a wide range of ${\delta}^{13}C,-20.1%_0~-54.4%_0$ compared to bituminous coal, $-25.2%_0~34.3%_0$. Delta values of several molecular compounds in two terrestrial samples are different. They show several distinct distributions in isotopic ratios compared to those of meteorite; Murchison meteorite has a range of ${\delta}^13C\;from\;-13%_0\;to\;+30%_0$. These results provide interpretation for the source and the formation condition of each rock, in particular alteration and migration processes of organic matter. Especially, they show an important clue whether some hydrocarbon molecules observed in meteorite are indigenous or not.

키워드

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