Abstract
There were strong volcanic and hot spring activities in Late Proterozic in the Xiqiu mining district, Zhejiang Province. The volcanic rocks and hydrothermal sedimentary cherts have high contents of the major metallogenic elements. Their atomic percentage of Cu:Zn:Pb is similar very much between volcanic rock, hydrothermal sedimentary chert and ore. Therefore, the metallization has a direct bearing on the volcanic and hot spring activities in the Xiqiu area. The δ34S values vary from −6.5‰ to 2.8‰, the δ30Si values from −0.2‰ to 0.6‰, and the δ18O values from 8.14‰ to 22.32‰ Lead isotopes were derived mainly from the lower crust. The ores have high contents of As, Sb, bi, Ga, Zn, and Ba, and low Al/(Al + Fe+ Mn) ratios, with Zn/(Zn+ Pb) ratios approximate to unity. Therefore, the Xiqiu massive copper sulfide deposit can be ascribed to volcano-hot spring deposition.
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