Approach on source rock or source region of porphyry copper deposits

Most of porphyry copper deposits are confined to Central Asian-Mongolian belt, circum-Pacific belt and Tethyan belt where Paleozoic, Meso-Cenozoic and Cenozoic convergent plates lies respectively. A small amount of porphyry copper deposits are confined to Precambrian orogenic zones. It is inferred that geological setting characteristic of convergent plate existed as early as in the Precambrian. A great amount of initial Sr isotopic ratios, epsilon(Nd) (t), epsilon(Sr), (t) and REE data in combination with the geological setting indicate that the source rock or source region of ore-bearing porphyry might be ocean basalt (depleted upper mantle). It is inferred from ore-bearing porphyry was derived from partial melting of oceanic crust or upper mantle, however, there is evidence for contamination with lower crust. The porphyry copper belts, spatially, are coincident with active continental margins and associated with plate suture zones (confined to the hanging wall of the suture zone), and, temporally, with interval from subduction of oceanic crust to continent-continent collision orogeny. Thus, porphyry copper ore-formation occurs through whole pcocess from active continent margin accretion to lithosphere delamination.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000221036700005&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701GeologySCI(E)中文核心期刊要目总览(PKU)中国科学引文数据库(CSCD)342,SI229-2382