The characteristics of metallogenic rocks in the Pulang porphyry copper deposit of Yunnan Province

The Pulang porphyry copper deposit is a typical Indo-Chinese porphyry copper deposit in Zhongdian area,hosted in southern composite body of the Yidun structural—magmatic belt.The composite rock body is a hypabyssal-ultrahypabyssal intermediate-acid porphyry(porphyrite) body,which can be divided into three invasion stages,i.e.,quartz diorite porphyrite,quartz monzonite porphyry,and granodiorite—porphyry.Geochemical characteristics show that the rocks are enriched with Ba,La,Rb,Sr,K,chalcophile elements Cu,Pb,and siderophile elements Mo,Ni,and are depleted in Nb,Zr,Hf and Ti.Porphyry(porphyrite) is the same as the rock series of granite island,belonging to calc—alkaline suite,and their genetic types are also similar to each other,belonging to I-type granite.The ore bodies are controlled by structures.The porphyry copper deposit mainly occurs in the Indo-Chinese intermediate-acid porphyry(porphyrite),and the mineralization was controlled by such factors as magmatic rocks,emplacement formation,uranium migration,hydrothermal alteration and structural space,which jointly constituted a porphyry metallogenic system characterized by the structural—magmatic—hydrothermal coupling in Indo-Chinese period.