| Kangshan gold deposit is located in the west side of Xiong'er area in the south of north China platform,it has a simple formation which consists of Taihua group as a basement and Xiong'er group as a cover.Through the system analysis of geochemical characteristics based on metamorphic rocks and volcanic rocks,altered rocks and gold ore.Exploring the characteristics of ore-controlling structure and summarizing the regional geological background and ore deposit geology and exploring the gold deposit genesis in xionger area.The gneiss in Kangshan gold deposit has the characteristics of rich alkali and rich aluminum,with the complex protolith,by the late sedimentation and multiphase metamorphism,main protolith is igneous rock and thick mudstone.Volcanic rocks are mainly andesite which belong to shoshonite and high-k calc-alkaline series of subalkaline.The andesite has the characteristics of rich iron,rich magnesium,rich alkali and less aluminum.The concent of SiO2 and Au is increased from gneiss-andesite-altered rock to gold ore.The trace elements Rb,Ba and K are enrichment in gold ore.A few trace elements such as La,Ce,Nd,P,Zr and Hf and Y are less enrichment.The elements such as Th,U,Ta,Nb,Ti,Lu,Sm are loss while Sr,Nb and Ti are strong loss.The standardization distribution curve of Gold ore is more closer to altered rock and andesite.V/Cr in the ore has a weak positive correlation to the Sr/Ba.According to Taihua group's gold abundance reach an average of 1.14×10-9 and Xiong'er group is 0.64×10-9,Taihua group has more possibility to provide Au for gold deposit than Xiong'er group.Rare earth distribution curve shows the right “L” type,it has the characteristics of light rare earth enrichment and heavy rare earth weak loss.Altered rock distribution curve is located in the transitional zone between gold ore with rock.The differentiation of gold ore about light rare earth and heavy rare earth is not obvious,its content was lower than gneiss and andesite,its tilt angle is consistent with area gneiss and andesite,it approves that both Taihua group and Xiong'er group have provided some ore-forming materials.on the whole,the rare earth eigenvalue ?REE of gold ore is weak positive correlated with LREE/HREE,LREE/HREE and ?Eu has negative relationship in a straight line,which is consistent with Marine original rock sedimentary characteristics.The deposit has a ore controlled faults model characteristic.It refers to the northeastern Kangshan – Qiliping fault is a major stracture fault,and the secondary faults parallel with the major,the alteration has its zone.The distribution of Vein is suitable for superposition distribution characteristics,The content and thickness in the different positions is different.Mineralization of vain is incraced from the north – east-south to the west.The thickness and concent has positive correlation,it has the ore-bearing hydrothermal ore-forming regularity and has the characteristics of pulse.Mantle source Taihua group and Xiong'er group and crustal magma provided Au,S,Pb and other trace elements for fluid.Then the fluid went cross the fault until arrived the destination,and in this period fluid Mixed by magmatic water and atmospheric water.In a word,Kangshan gold deposit was a middle(low)temperature magmatic hydrothermal gold deposit. |
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