西南区前震旦系中叠层石和非叠层石碳酸盐的稳定同位素的研究,国内尚属首次。所测数据自老而新地层中δ~(18)O值,与国外对比相一致,有增大的趋势,再次论证了为疑源类、叠层石所证实的昆阳群—东川群为正常层序;结合对塔甸—美党期沉积盆地古环境特征分析,结论也是一致的。 For the first time in China, the stable isotopes of stratigraphic and non-stratiform stone carbonate in the former Sinian in the southwestern area have been studied. The δ 18 O values ​​of the measured data from the old and new strata are consistent with those of the foreign strata and have a tendency of increasing. Once again proved that the Kunyang Group - Dongchuan Group As a normal sequence. Combined with the analysis of paleoenvironmental features in the Tarim-Uprising sedimentary basin, the conclusion is also consistent.