Helium and argon isotopic compositions of the Longquanzhan gold deposit in the Yishu fault zone and their geological implications

• Published in: Acta geochimica Vol. 26; no. 1; pp. 46 - 51
• Main Author: 胡华斌 孙爱群 牛树银 王宝德 李英平
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Nature B.V 01.03.2007; College of Resources, Shijiazhuang University of Economics, Shijiazhuang 050031, China%Shandong Institute of Geological Survey, Ji'nan 250031, China
• Subjects: Argon; Geochemistry; Geology; Gold; Helium; Meteoric water; Mineralization; Mineralogy; Oxygen isotopes; 地质意义; 氦同位素成分; 氩同位素成分; 沂水县龙泉站金矿; 沂沭断裂带; Yishu fault zone; ore-forming fluid; helium and argon isotopes; Longquanzhan gold deposit
• ISSN: 1000-9426; 2096-0956; 1993-0364; 2365-7499
• DOI: 10.1007/s11631-007-0046-2

The Longquanzhan gold deposit hosted in granitic cataclasites with mylontization of the foot wall of the main Yishui-Tangtou fault. ^3He/^He ratios in fluid inclusions range from 0. 14 to 0. 24 R/Ra, close to those of the crust-source helium. ^40Ar/^36Ar ratios were measured to be 289-1811, slightly higher than those of atmospheric argon. The results of analysis of helium and argon isotopes suggested that ore-forming fluids were derived chiefly from the crust. The δ^13O values of fluid inclusions from vein quartz range from -1.78‰ to 4.07‰, and the δD values of the fluid inclusions vary between -74‰ and -77‰. The hydrogen and oxygen isotope data indicated that the ore-forming fluid for the Longquanzhan gold deposit had mixed with meteoric water in the process of mineralization. This is consistent with the conclusion from the helium and argon isotope data.