华北地区石炭、二叠系腐殖煤中的四环二萜烷

从华北西部和南部五个煤矿取得的石炭、二叠系腐殖煤的饱和烃馏分中,经GC和GC/MS分析，检测出了较丰富的二萜类生物标志物。根据质谱特征与卡瓦保留值，并对照文献谱图，确认其中包括五个具有贝壳松烷骨架的四环二萜烷(即ent-白叶烷、16α(H)-和16β(H)-扁枝烷、16α(H)-和16β(H)-贝壳松烷)，以及一个三环的异海松烷。一个完整的四环二萜烷系列在我国华北石炭、二叠系腐殖煤中的发现在北半球很可能属首次。这些二萜类内组成在时间和空间上的差异分布，可能反映古植物群演化与分布的变化。扁枝烷和贝壳松烷的立体化学构型，可提供重要的有机成熟度信息。

TETRACYCLIC DITERPANES OF CARBONIFEROUS AND PERMIAN HUMIC COALS IN NORTH CHINA

Diterpenoid biomarkers were evidently detected by GC and GC/MS analysis in the saturated hydrocarbon fractions of arboniferous and Permian humic coals in five coal mines in the western and Southern North China. Based on the characteristics of mass spectra, kovats indices as well as the comparison with literature ， their major conipcTnents were determined as five tetracyclic diterpanes with kaurane-typc skeletons, i.e., ent-beyerane, 16α(H) -and 16β(H) -phyllocladanes, 16α(H) -and 16β(H) -Kauraaes as well as atricyclic isopimarane, The discovery of a complete series of tetracyclic diterpanes in the Carboniferous and Permian coals in North China probably is the first case in the northern hemisphere. The differences of diterpenoid inner composition of humic coals trom different periods and positions in North China may reflect the variation of evolution and distribution of the palaeobotanic assemblages. The stereochemical configurations of phyllocladanes and kauranes could provide some information on the itiaturity of organic matter.