Open AccessFluid inclusions at different depths in the S anshandao gold deposit, J iaodong P eninsula, C hina
Author(s) -
Hu F. F.,
Fan H. R.,
Jiang X. H.,
Li X. C.,
Yang K. F.,
Mernagh T.
Publication year - 2013
Publication title -
geofluids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.44
H-Index - 56
eISSN - 1468-8123
pISSN - 1468-8115
DOI - 10.1111/gfl.12065
Subject(s) - geochemistry , stockwork , geology , isochron , sericite , mineralization (soil science) , mineralogy , metallurgy , materials science , hydrothermal circulation , seismology , copper , chalcopyrite , soil science , soil water
The S anshandao gold deposit, located at northwestern edge of the J iaodong P eninsula, eastern N orth C hina C raton, is one of the largest gold deposits in the J iaodong gold province. In the deposit, disseminated‐ and stockwork‐style ores are hosted in M esozoic granitoids. Mineralization and alteration are largely controlled by the regional S anshandao– C angshang fault. Sericite separated from alteration rocks in the mineralized zone yields an Rb–Sr isochron age of 117.6 ± 3.0 Ma. The ore‐forming fluids in the S anshandao gold deposit contain CO 2 ‐H 2 O‐NaCl±CH 4 with low to intermediate temperatures and low salinities. Microthermometric analysis shows that homogenization temperatures gradually decrease from the early mineralizing stage (258–416°C) to main mineralizing stage (180–321°C) and to late mineralizing stage (112–231°C). Homogenization temperatures from the same mineralizing stage are nearly same and do not show an increase with depth. The nature of the ore‐forming fluids remains nearly the same over a 2000 m vertical depth interval.