Abstract
The Jiaojia gold deposit is located in the northwest jiaodong ore-concentrated area, north wing of Laizhou-Xixia anticlinoria, the orebody occurred in the granite which exists the footwall of Jiaojia Fault, Jiaojia Fault is the eastern secondary NE-NNE trending fault of Tan-Lu Great Fault. There are three types of fluid inclusion in Jiaojia gold deposit, respectively are H2O-CO2 inclusion (H-C type), CO2-H2O-CH4 inclusion (CH4 -bearing type) and H2O inclusion (H type). In Jiaojia gold deposit, the main ore-forming temperature is 170.2～358.1℃, the salinity is ranging from 2.04 wt% NaCl.eq to 10 wt% NaCl.eq with a average of 6.64 wt% NaCl.eq, sum intensity is (0.89～0.946) g/cm3 , pressure estimation is 2×103～3.8×103kPa, the Jiaojia gold deposit is mesothermal gold deposit. The metallogenic substances derived from a mantle-crust-mixed source according to the S and Pb isotopes. The Jiaojia gold deposit was formed in the late stage which was a tensional environment. The ore-forming fluids mainly derived from magmatic and meteoric water, and a fraction of metamorphic water. The Jiaojia gold deposit is formed in the Yanshanian.
Highlights
Jiaodong is one of the most important gold producing area in China, it reserves account for 1/3 of rock gold in our country has proven, its importance is self-evident.The Jiaojia gold deposit is located in the northwest Jiaodong ore-concentrated area, north wing of Laizhou-Xixia anticlinoria, the orebody occurred in the granite which exists the footwall of Jiaojia Fault, Jiaojia Fault is the eastern secondary NE-NNE trending fault of Tan-Lu Great Fault
The fluid inclusion microthermometry analysis is conducted on the Linkan THMS 600 type heating-cooling stage of Chang'an University Metallogeny and Metallogenic Dynamics Key Fluid Inclusion Laboratory of the Ministry of Education, and temperature calibration is conducted on the heating-cooling stage by utilizing the artificially synthesized fluid inclusion standard sample provided by the U.S FLUIDINC Company
Through the detailed microthermometry on fluid inclusions of the representative sample at all metallogenic stages of Jiaojia Gold deposit and by combining with the inclusion study of predecessors on Jiaojia Gold Mine, it is concluded that the temperature range of main metallogenic epoch is between 170.2~358.1°C, the salinity (NaCl) is 2.04%~10% with a mean value of 6.64%(NaCl)
Summary
Jiaodong is one of the most important gold producing area in China, it reserves account for 1/3 of rock gold in our country has proven, its importance is self-evident.The Jiaojia gold deposit is located in the northwest Jiaodong ore-concentrated area, north wing of Laizhou-Xixia anticlinoria, the orebody occurred in the granite which exists the footwall of Jiaojia Fault, Jiaojia Fault is the eastern secondary NE-NNE trending fault of Tan-Lu Great Fault. Jiaojia gold deposit is one of the last three decades an important prospecting achievements for our broken with altered rock type gold, and achieved fruitful results of the prospecting, research results can be described as "voluminous". Shandong Jiaojia gold deposit is the typical area for "Jiaojia Type" of broken belt altered rock type gold deposit, is one of the important ore deposits in the geology study. The previous research of Jiaojia gold deposit is relatively inadequate and especially lack of systematic comprehensive geochemistry study such as fluid inclusion, stable isotopes, etc. It's important for us to study the geology characteristics, fluid inclusion and stable isotopes in this area, in order to conclude ore-forming regulations and metallogenic prediction in this region The previous research of Jiaojia gold deposit is relatively inadequate and especially lack of systematic comprehensive geochemistry study such as fluid inclusion, stable isotopes, etc. it's important for us to study the geology characteristics, fluid inclusion and stable isotopes in this area, in order to conclude ore-forming regulations and metallogenic prediction in this region
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