Abstract:

 There are some CuZn polymetallic ore deposits  of volcanic hosted massive sulfide (VHMS) type  located in the Tongbai Region, Henan Province, China.  The trace element and rare earth element (REEs) abundance of ores of Liushanyan CuZn deposit, DalishuFanglaozhuang CuZn deposit and Yangjuan Cumineralizing spot were analyzed by using ICPMS method in order to discuss the genesis of these deposits. Four types have been identified on the  basis of study on trace elements and REEs geochemistry: ores of the first type show LREEenriched REE patterns, without Eu anomalies and weak negative Ce anomalies, but with a weak depleted HFSE and smaller anomalies at Zr and Ti relative to NMORB; ores of the second type show LREEenriched REE patterns having negative Eu anomalies and weak negative Ce anomalies; ores of the third type show LREEenriched REE patterns, having positive Eu anomalies and negative Ce anomalies, with a depleted HFSE and small negative anomalies at Zr and Ti relative to NMORB; ores of the fourth type show horizontal REE distribution patterns, having positive Eu anomalies and weak negative Ce anomalies, with a depleted HFSE and no anomalies at Zr and Ti relative to NMORB. The first type and the second type have similar characteristics to the basic volcanic rocks and acid volcanic rocks respectively. Characteristics of the third type indicate that the convective mixing of a small amount of sea water with high  temperature hydrothermal fluids had happened with a lot of minerals which are insoluble in the solvents in the residual phase. The fourth type has a depleted mantle source. These characteristics indicate that the mineralization material has the same source with its wall rocks of the Liushanyan Formation, which are the products of mantle partial melting that had undergone  multiple earlier melting events.

Key words: CuZn ore deposit; trace elements; rare earth elements; Liushanyan; Tongbai Region; Henan Province