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| Trace Element Characteristics of Pyrites from the Jinchang Gold Deposit in Helongjiang Province, China and Its Geological Significance |
| QING Min1, HAN Xian-ju1, ZHANG Le-jun2, ZHANG Dai1, ZHAO Yu-suo1, XIAO Li1, WANG Ke-yong3 |
1. Institute of Gold Geology in CAPF, Langfang Heibei 065000, China;
2. CODES ARC Centre of Excellence in Ore Deposits, University of Tasmania, Hobart 7005, Tasmania, Australia;
3. College of Earth Sciences, Jilin University, Changchun 130061, China |
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Abstract This paper carried on in situ LA-ICPMS trace element analysis and elemental mapping on pyrite from four metallogenic stages in breccia-pipe type and fault-controlled altered rock type gold mineralization, in the Jinchang super-large gold deposit, Dongning County, Heilongjiang Province, China. The results show that pyrite is rich in As, Co, Ni, Cu, Pb, Zn, Au, Ag, Sb, Se, Te and Bi and with small amounts of W, Mo and Sn. From the first metallogenic stage to the fourth, pyrites from two types of gold mineralization have covariant trace metal element compositions with overall trend of decreasing Co, Ni and increasing As. Enrichment of Au, Ag, Cu, Pb and Zn concentrated in the second and third stages. It is thus concluded that two gold mineralization types and three gold orebodies of Jinchang belong to different part of the same porphyry system. The content of As, Au+Ag, Cu, Pb+Zn, total trace elements and compositional zonation in pyrite can be effective indicators to evaluate intensity of gold (polymetallic) mineralization, associated ore-forming elements and ore occurrence. Elemental mapping of pyrite using LA-ICPMS can effectively and economically distinguish different stages pyrite and easily qualify the variety of trace elements.
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