(Figure 2, page 940) K-T boundary enrichment for cerium and iridium chemical ...

Hydrogenous manganese nodules form on the ocean floor by slow authigenic precipitation (1-6 mm/Ma) of the oxyhydroxides of manganese and iron that continuously scavenge trace...水成锰结核（Hydrogenous manganese nodules）形成于洋底，由锰和铁的羟基氧化物以每百万年1至6毫米的速率发生缓慢自生沉淀作用形成，此类羟基氧化物会持续捕集痕量……