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报道了辽河断陷下第三系烃源岩有机质 (干酪根、可溶有机质 )的Pb ,Sr同位素组成 .干酪根的Pb同位素组成有很大的变化范围 ,2 0 6Pb/2 0 4Pb =17.488～ 18.6 5 6 ,2 0 7Pb/2 0 4Pb =15 .388～ 15 .6 92 ,2 0 8Pb/2 0 4Pb =37.6 5 6～ 37.748,可溶有机质具有相当稳定的Pb同位素组成 :2 0 6Pb/2 0 4Pb =17.42 4～ 17.6 0 1,2 0 7Pb/2 0 4Pb =15 .376～ 15 .448,2 0 8Pb/2 0 4Pb =37.6 2 0～ 37.870 .干酪根的Sr同位素组成变化在 0 .70 6 35～ 0 .716 79之间 ,可溶有机质的Sr同位素组成有较大的变化范围 ,在 0 .70 96 7～ 0 .7475 9之间 .根据上述特征 ,说明了在裂谷盆地的地质环境中 ,地幔流体对有机质 (古生代、中新生代 )的作用以及热液烃生成的可能性
The Pb and Sr isotopic compositions of organic matter (kerogen, soluble organic matter) in the Lower Tertiary source rocks in the Liaohe Fault Depression are reported. The Pb isotopic composition of kerogen varies greatly, with 206Pb / 204Pb = 17.488 ~ 18.6 5 6, 2 0 7Pb / 2 0 4Pb = 15 .388 ~ 15 .6 92, 2 0 8Pb / 2 0 4Pb = 37.6 5 6 ~ 37.748, and the soluble organic matter has quite stable Pb isotopic composition: 206Pb / 2 0 4Pb = 17.42 4 ~ 17.6 0 1,2 0 7Pb / 2 0 4Pb = 15.376 ~ 15.448,2 0 8Pb / 2 0 4Pb = 37.6 2 0 ~ 37.870. The Sr isotopic compositions of kerogen vary with 0 .70 6 35 ~ 0 .716 79 between the soluble organic Sr isotope composition has a larger range of variation, between 0.70 96 7 ~ 0.7475 9. According to the above characteristics, indicating that in the rift The role of mantle fluid on organic matter (Paleozoic and Mesozoic Mesozoic) and the possibility of hydrothermal hydrocarbon generation in the basin’s geological environment