The Huaiji area belongs to the middle section of the Nanling metallogenic belt in Guangdong Province.The metallogenic geological conditions of the Huaiji area are superior.A large number of deposits（points） such as iron，lead，zinc and silver have been found in the area，but their genetic relationship with granite has not been studied in depth.In order to determine the source of minerals，S，Pb，H and O isotope geochemistry studies were carried out to explore the source of metallogenic minerals.On the basis of the background analysis of ore-forming elements，the Pb and S isotope analysis of sulfide in the ore，and the O，H，C isotope analysis of the quartz and carbonate in the altered rock and ore were carried out to trace the mineralization and the source of ore-forming fluids reveals the coupling relationship between magmatic activity and mineralization.The results show that：δ ³⁴S_CDT（‰） is -0.12‰~6.58‰，the mean value is 3.23‰，the peak is in the 3‰~5‰，there is a clear tower-like distribution.Since there is no sulfate in the ore，most of the S in the ore-forming fluid is H₂S，which is in a low f（O₂） and low pH environment.The δ ³⁴S value of pyrite is approximately equal to the δ ³⁴S∑S value of the fluid.Therefore，its sulfur source mainly comes from deep sources，and a small part comes from sulfate materials in stratigraphic marine carbonate rocks.The Pb isotopic composition of most ores is similar to that of Late Cretaceous granite potash feldspar，but the ²⁰⁷Pb/²⁰⁴Pb value of the ores is generally slightly lower.The ore-forming material may mainly come from granite，but there is a small amount of mantle-derived material during the mineralization.The test results of the H and O isotopes of the representative quartz fluids related to the Late Cretaceous granites in the survey area are input into the fluid hydrogen and oxygen isotope composition diagram.Except for the Jiangjuntou deposit，all fall into the range of magmatic water，indicating the main source of ore-forming hydrothermal fluids in magma water.Through the study，it is further confirmed that the ore-forming materials and ore-forming fluids of the skarn type and skarn-hydrothermal vein type deposits in Huaiji area are mainly derived from the late Cretaceous granite.

http://www.goldsci.ac.cn/article/2021/1005-2518/1005-2518-2021-29-6-805.shtml