WANG Xin-li1,2, GU Xue-xiang1,3, PENG Yi-wei1, ZHANG Yong-mei1,3, ZHANG You-hui4, GAO Hu1, HE Ge1, ZHOU Chao1
1. School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China;
2. Xinda Gold & Silver Development Centre, Beijing 100038, China;
3. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences(Beijing), Beijing 100083, China;
4. Central South Institute of Geological Survey, China Metallurgical Geology Bureau, Wuhan, 430081, China
Abstract:The Halegati Fe-Cu deposit located in the Boluoke'nu metallogenic belt, western Tianshan area, Xinjiang, China, is a newly discovered medium-scale skarn deposit. Its ore bodies occur in the contact between the Dawabulake monzogranite body and marble or marblzed limestone of the Upper Ordovician Hudukedaban Formation. This paper studied sulfur, lead, carbon and oxygen isotopic geochemical characteristics of the Halegati deposit. The δ34S values of sulfides from the deposit vary from -1.7‰ to 4.9‰,with an average of 1.8‰, indicating that the sulfur was mainly derived from deep magma. The 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb ratios of sulfides vary from 17.951 to 20.224, 15.568 to 15.692, and 38.02 to 40.22, respectively, which are consistent with a mixed ore lead source between crust and mantle in the subduction zone. The δ13CV-PDB values vary from -1.9‰ to -1.4‰ and the δ18OV-SMOW values vary from 10.8‰ to 17.9‰ for marble indicate that it was formed through re-crystallization of marine carbonates. The δ13CV-PDB and δ18OV-SMOW values of the calcite vary from -2.9‰ to 0.0‰ and 12.0‰ to 14.7‰, respectively, indicating a marine carbonates source of carbon and a mixed source of oxygen between the ore-forming fluid and marine carbonates.
Keywords: isotope source of ore-forming materials Halegati Boluoke’nu western Tianshan area
