Petrogenetic Significance of the New Petrogenetic Grid (2000) Compared with Synthetic System and Theoretically Computed Grid

  • Ahn, Kun-Sang (Department of Earth Science, College of Education, Chosun University) ;
  • Nakamura, Yasuo (Department of Earth Science and Astronomy, College of Arts and Sciences, University of Tokyo) ;
  • Shin, In-Hyun (Department of Earth Science, College of Education, Chosun University)
  • 발행 : 2002.01.31

초록

The observation of the new biotite isograd (chlorite + chloritoid = andalusite + biotite) in the Mungyong coal field requires the modification of Harte and Hudson's (1979) metapelite grid which eliminates the stability field of staurolite + cordierite assemblages. The newly proposed metapelite grid by Ahn and Nakamura (2000) can define more properly the isograd reaction observed from nature. We discuss first topological interrelations between synthetic system (FASHO-, KFASHO-, KFMASH system) on an isobaric section at 2kbar, where phase relations are well constrained. The following discussion is concentrated on the topological relations between stable reactions. At the last, we discuss the petrogenetic significance of the Ahn's petrogenetic grid compared with theoretically computed grids. Ahn's petrogenetic grid is consistent with synthetic and natural system, and is one of the excellent example of KFMASH approximation in metapelite.

키워드

참고문헌

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