ON THE REE ACROSS THE PERMIANTRIASSIC BOUNDARY IN SOUTH CHINA

This paper discusses the INAA results of REE in clays atand near some Permian/Triassic boundaries of South China.It showsthat the REE patterns of boundary clays differ from those of non-boundary clays.One difference is that the boundary clays are moreenriched in LREE,with steeper slope of REE and a smaller Eu nega-tive anomaly than the non-boundary clays.Another difference is that theboundary clays show a small Ce negative anomaly,but no Ce anomalyoccurs in the non-boundary clays.From these REE patterns and some other experimental facts,it isproposed that the P/T boundary clay may be a mixed product consistingof the acidic-intermediate ash and the upper crust substance representingsputtering component,and the calculated fraction of the former andlatter is 7/3.

ON THE REE ACROSS THE PERMIANTRIASSIC BOUNDARY IN SOUTH CHINA

This paper discusses the INAA results of REE in clays at and near some Permian/Triassic boundaries of South China.It shows that the REE patterns of boundary clays differ from those of non- boundary clays.One difference is that the boundary clays are more enriched in LREE,with steeper slope of REE and a smaller Eu nega- tive anomaly than the non-boundary clays.Another difference is that the boundary clays show a small Ce negative anomaly,but no Ce anomaly occurs in the non-boundary clays. From these REE patterns and some other experimental facts,it is proposed that the P/T boundary clay may be a mixed product consisting of the acidic-intermediate ash and the upper crust substance representing sputtering component,and the calculated fraction of the former and latter is 7/3.