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Geological and geochemical characteristics and prospecting potential of the Daqiao hot spring‐type gold deposit in the west Qinling Orogen
Author(s) -
Liu Yunhua,
Han Yixiao,
Wei Juzhen,
Teng Fei,
Tian Runqing,
Gao Zuoyu
Publication year - 2018
Publication title -
geological journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.721
H-Index - 54
eISSN - 1099-1034
pISSN - 0072-1050
DOI - 10.1002/gj.3077
Subject(s) - geology , geochemistry , prospecting , pyrite , mineralization (soil science) , hot spring , breccia , metallogeny , ordovician , skarn , mesothermal , zircon , nappe , tectonics , hydrothermal circulation , fluid inclusions , paleontology , sphalerite , soil science , soil water
Great breakthroughs have recently been made in discovery of gold deposits in the west Qinling Orogen, which is an important component of the Central China Orogen, the most important gold metallogenic region in China, with numerous developed gold deposits. The Daqiao gold deposit is located in the west Qinling region of the Central China Orogen at the convergence of the Minxian–Dangchang–Liangdang and Zhouqu–Chengxian thrust and nappe tectonic belts. The gold orebodies exist in the silicolites occurring in a funnel shape at the lithologic unconformity between the Triassic lower limestone and argillaceous slate; ore types are dominated by siliceous breccia type, and ores are dominated by brecciated, filmy, crusty, veinlet–mesh vein, and porous structures, with silicification and kaolinization developed widely. The silicolites have δ 30 Si = −0.7–0.4‰ and δ 18 O = 12.8–17.9‰; their formation temperature calculated with an oxygen isotope thermometer is 108–182 °C. These features indicate characteristics of hot spring‐type gold deposits. The δ 34 S values of the pyrite (from 1.6‰ to 9.41‰ in the early period and −11.6‰ to 9.82‰ in the late period) and the lead isotope results show that the metallogenic materials were from a mixture of magmas and strata in the early period and from strata in the late period. The zircon SHRIMP U–Pb age of the granodiorite related to mineralization is 230.9 ± 1.9 Ma. A comprehensive study of the Daqiao gold deposit indicates that it is a hot spring‐type gold deposit, formed in an intracontinental orogenic environment.