Enrichment value for zinc is 5.3343, Igeo is -5.4371, and contamination factor is 0.0346. please explain how is enrichment severe, yet Igeo negative

my Enrichment value for zinc is 5.3343, Igeo is -5.4371, and contamination factor is 0.0346.

please explain how is enrichment severe, yet Igeo negative and contamination low?

i used Zinc background value from shale of Turkian and Wedepohl, which is 95 ppm Fe reference value Read more Read less