positive anomaly

5×10~(-6)-290×10~(-6)), their chondrite-normalized patterns show a strong enrichment of LREE and positive Eu anomaly, in contrast with the dolomites which show a slight LREE enrichment and moderately neg.

研究表明,不同类型矿石均具REE总量高(726×10 6～4633×10 6)、铕正异常(1 68～5 16)、轻稀土强烈富集[(La/Yb)N=3 98～81 1]等特征,Y/Ho比值(24 4)小于球粒陨石中比值(28),与黑烟囱的比值接近。

Nearly all the literatures about Palaeoproterozoic positive δ 13 C carb excursion in the carbonate sequences on the earth during 2.

06Ga)碳酸盐岩碳同位素正异常现象的基础数据及资料。