Late Paleozoic Molybdenum Ore Uplift and Erosion in Jilin and Heilongjiang Area:Geochemical Evidence of Geology and Sedimentary
The Erzhan molybdenum deposit in the eastern of Jilin and Heilongjiang is a small molybdenum deposit related to acidic intrusions in the Late Paleozoic era.It is unclear whether the Late Paleozoic molyb-denum deposits represented by it have undergone uplift and erosion damage.Based on the geochemical measurements of sediments and soil elements in the water system,compared with the widely distributed Mesozoic molybdenum deposits in the Da Hinggan Mountains,the Xiao Hinggan Mountains,and the Zhangguangcai Mountains,the Paleozoic molybdenum deposits exhibit geochemical characteristics of Mo element in the water system and soil that inconsistent with the scale of the deposits,with large anomalous areas and high concent.Through exploration of trenches and drilling engineering in the research area,it has been revealed that the alteration of the mineralized rock mass is characterized by chloritization sericitization pyrite mineralization and potassium feldspar core,which is consistent with the alteration zoning of the por-phyry deposit model.However,the northeast oriented ore body has a relatively gentle occurrence,and the potassium mineralization core in the north of the ore body is buried relatively shallow.Combined with the identified uplift and erosion events in area of the Xiao Hinggan Mountains,Huanan,and the Da Hinggan Mountains,it is indicated that the Late Paleozoic molybdenum deposits represented by the Erzhan molyb-denum deposit have undergone uplift and erosion in the Xiao Hinggan Mountains-the Zhangguangcai Mountains since the Mesozoic era,resulting in the partial erosion of the ore body and the formation of a large area of secondary halo anomalies.The content of ore-forming elements is higher than that of most Mesozoic molybdenum deposits,which has a significant impact on the Late Paleozoic molybdenum depos-its.The preservation has a negative impact.
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维普
