Significance of zircon trace element geochemistry,the Shihu gold deposit,western Hebei Province,North China

• Published in: Journal of rare earths Vol. 29; no. 3; pp. 277 - 286
• Main Author: 曹烨 李胜荣 张华锋 刘小滨 李真真 敖翀 要梅娟
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.03.2011; School of Earth Science and Resources,China University of Geosciences,Beijing 100083,China; State key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Beijing 100083,China; Department of Earth Sciences,Laurentian University,Sudbury,P3E2C6,Canada%State key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Beijing 100083,China; School of Earth Science and Resources,China University of Geosciences,Beijing 100083,China%School of Earth Science and Resources,China University of Geosciences,Beijing 100083,China
• Subjects: Correlation; Diorite; geodynamic background; Quartz; Rare earth metals; rare earths; Rocks; Shihu gold deposit; single zircon; Taihang Orogen; trace element geochemistry; Trace elements; Veins; Zircon; 含金石英脉; 地球化学意义; 微量元素含量; 河北省; 等离子体质谱分析; 金矿化; Taihang Orogen; geodynamic background; single zircon; trace element geochemistry; Shihu gold deposit; rare earths
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(10)60445-0

The Shihu gold deposit is characterized by gold-bearing quartz-polymetallic sulfides and quartz veins.Both Mapeng granitoids batholith and intermediate-basic dikes intruded the metamorphic basement rocks,and are spatially associated with gold mineralization.Trace element abundances in zircons from the Shihu gold deposit,determined by laser-ablation microprobe ICPMS analysis,are sensitive to source rock type and crystallization environment.Concentrations of 21 trace elements were determined for zircons from granitoid rocks,diorites,quartz diorite porphyrites and gold-bearing quartz veins revealed some elemental characteristics and chondrite-normalized trace element patterns from different samples.There were no distinctive differences in REE concentrations of zircons from plutonic rocks and quartz veins,indicating that they probably had the same origin.Relatively flat chondrite-normalized REE patterns with（Yb/Sm）N ratios less than 60 characterized zircons from quartz diorite porphyrites and quartz veins.The highest Nb/Ta ratios were found in zircons from quartz diorite porphyrites,whereas the lowest ratios were found in quartz vein zircons.The Nb/Ta ratios were broadly correlated with HREE＋Y contents,and had weak positive correlations with the depth of the Eu negative anomalies.High values U up to 0.4% and Th up to 0.1%,as well as positive correlations with REE＋Y characterized zircons from quartz vein.The lowest Th/U ratios of zircons present in quartz veins reflected the relatively high concentration of U in hydrothermal fluid,and high Pb concentrations only typified quartz vein grains relatively enriched in U and Th.Zircons from quartz diorite porphyrites showed the most pronounced Ce anomalies,whereas weak Ce anomalies were typical of zircons from quartz veins,in which Eu/Eu＊ of zircons had a broadly negative correlation with Ce/Ce＊.Trace element geochemistry of zircons from mineralized quartz veins and plutonic rocks confirmed that the sources of ore-forming materials were from Precambrian host rocks.Our results significantly enhanced the usefulness of zircon in crustal studies of the North China craton and as an indicator mineral in mineral exploration of the Taihang region.