The regional distribution patterns for 20 critical melts derived by an areal-pattern recognition technique leads to the conclusion that metals are regularly distributed preferentially in the accreted and cratonic terrains in and surrounding the state of Washington, USA. The distribution patterns along distinctively different zones differ in these contrasting crusts across a concealed boundary that is established by Sr-isotope data. Cu and Au appear to be abundant in both terrains; Ni, Co, Cr and Pt-group metals predominate in accreted terrains; Pb, Zn, Sn and W are concentrated locally along the boundary zone and in the interior of the cratonic terrain. The association of metals with accreted terrains and with restricted areas or lineaments in the craton further supports the metallogenic hypothesis that metal materials are derived mainly from underlying ensialic and ensimatic crusts, and anticipates the possibility of remobilization of these materials along the same broad linear zones over geological time.-P.Br.
Additional Publication Details
Correlation of metal occurrence and terrane attributes in the northwestern conterminous United States.