| With the continuous growth of economy and depletion of surface deposits,exploiting the potential of deep mineral resources is the focus of mineral resource exploration and mineralization prediction research worldwide.Mesozoic intrusive rock mass currently plays an important role in the development of mineral resources.It is an important composition to research the process of deep geological mineralization and mineral prediction.It is also closely related to metallic-nonmetallic mineral resources which have great economic potential.This method is written to solve the problem of deep spatial relationship of Mesozoic intrusive rock mass and ore-controlling role in the Qingchengzi ore concentration area(Liaoning province).Then the deep distribution features of rock mass,occurrence mode and ore-controlling mode are studied.The results indicate that: the regions with relatively active magmatic or tectonic activities may be favorable area for exploration.Based on this cognition,Xinling-Shuangdinggou rock mass might be the key area for prospective prospecting.This achievement can be used for supporting the research metallogenic prediction research,deep ore-prospecting and quantitative resource evaluation.The geological research results of predecessor are summarized systematically.The spatial distribution states of the main lead-zinc deposits(Xiquegou,Diannan,Zhenzigou,etc.),Mesozoic intrusive rock messes(Xinling and Shuangdinggou),fault structures(Yushanggou,Erdaogou,etc.)and strata in the study area are identified.A macroscopic geological model is established which can describe the formation-enrichment-evolution process of lead-zinc deposits.In this area,all the lead-zinc ore bodies are spatially dependent with faults and rock masses.It can be inferred that the Mesozoic rock masses and secondary fractures not only participate in the lead-zinc mineralization stage,but also have latentcorrelation with the spatial enrichment of ore bodies.The existing geochemical data in Qingchengzi area are collected and managed,including geochemical data of rock mass(major elements,rare earth elements,isotopes and petrologic feature)and the geochemical data of ore deposit(S,Pb,H,O isotopes and fluid inclusions).The geochemical data show that Xinling rock mass and Shuangdinggou rock mass have a same source of magma and connected in deep each other.All the lead-zinc deposits in this area have the same material source as well.The metallogenic temperature is generally between 190? and 310?.The ore-forming hydrothermal fluid shows the characteristics of highly reductive and the hot brine mingle with magmatic hot water.On the basis of geological and geochemical studies,the deep spreading pattern of Mesozoic rock mass in the study area is preliminarily determined by anomaly analysis and potential field separation through 1:50,000 bouguer gravity anomalies.n order to directly reveal the spatial distribution relationship between deep rock mass and ore body,7 gravity inversion profiles are set up in Qingchengzi ore-concentrated area.Combined with the statistical and analytical results of stratigraphic,tectonic,petrophysical and geochemical data,the human-machine interactive gravity inversion are carried out under the constraint of joint information with interpretation and analysis of gravity data.Inversion results show that connecting part of Xinling-Shuangdinggou hidden rock mass is lopolith-like in the deep,which is the result of magmatic emplacement along Liaohe group interlayer fault during the Indosinian.The secondary faults formed in the same period are the main channels for the migration of ore-forming fluids.It provides space for Pb and Zn,and directly controls the migration process of ore-forming elements.In summary,the lead-zinc deposits are located in the vicinity of Mesozoic rock mass and fault in study area.All those deposits are controlled by Mesozoic rock mass and fault.Furthermore,fracture is the dominant factor of ore-controlling,while magmatic activity is the essential factor. |
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