| The study area is located in the north of Eergu'na gold and nonferrous metallogenic belt,Au-Cu-Mo metallogenic belt of Heilongjiang(marginal sea),the Laogo Au-Cu-Mo-graphite metallogenic belt(reverse zone),and the Menduli Au-Cu-graphite ore collection area.The mainly exposed stratas are Jurassic Xiufeng group,Ershierzhan group,Mohe group,Lower Cretaceous Guanghua group and Ganhe group.In the south,the exposed stratas are Middle Ordovician coarse monzonitic granite and early Cretaceous granodiorite-porphyry.The zircon dating indicates,the emplacement times respectively are 477.5 ± 5.9 Ma and 134.61 ± 0.77 Ma.Tectonic framework was controlled by NE direction region of Mohe nappe structure.The fault structures are mostly in NE direction,and anaphase developed the NNE and NW fracture.Thw region of study area has discovered the Shabaosi and Laogo gold deposits,ascertained the Maniqi River and Laogo River gold deposits and lower-Longgou River and Xilinji River placer gold.The existing prospecting and researching show that,geological conditions for mineralization in the study area are favorable,prospeciting indicators are obvious,prospecting potential of gold and polymetallic deposits is fine.Mineralization of Gold and polymetallic in the study area is Integrated controlled by Jurassic stratum,NW ans NE trending structures and Early Cretaceous magmatism.The contents of Au and Sb in the stratum of Lower-middle Jurassic Xiufeng group,the contents of Au,Ag,Cu,Mo and Sb in the stratum of middle Jurassic Mohe group,the contents of Cu and Mo in the granodiorite-porphyry of Early Cretaceous,the content of Zn in the monzonitic granite of Middle Ordovician are high.Jurassic stratas provide favorable conditions of surrounding rock for gold and polymetallic mineralization.The mineral formation is mainly controlled by the NW trending and NE trending faults,and the NE trending faults are hosting structure.Early Cretaceous magma intruded into the conglomerate basement of the Mohe group and formed mineralization.Granodiorite porphyry which is the source rocks for Copper and polymetallic,provided the heat source and carrier for the migration of ore fluid and enriched and formated the ore bodies in the favorable sites of ore-forming structures.The main prospecting indicators of gold and polymetallic mineralization are mineralization alteration and geophysical and geochemical prospecting anomalies.Silicification,pyritization(ferritization),chloritization and Carbonation are main sign of the alteration.The element association of Au,Ag,Cu,Mo and Sb is the chief geochemical marks.High resistance high polarization,low resistance high polarization and high magnetic in positive magnetic field are the significant geophysical prospecting indicators.According to the favorable level of metallogenic geological conditions,developmental condition of prospecting indicators,and the development characteristics of the Known mineralization,Circle the Laogoku gold,silver,copper,molybdenum and antimony grade ? Metallogenic prospective area,Shiyanshan gold and antimony grade ? Metallogenic prospective area,Shuangjianshan gold,silver,copper,molybdenum and antimony grade ? Metallogenic prospective area.Optimization of gold,silver,copper,molybdenum and antimony prospecting target in the east of Laogo River,copper,molybdenum and antimony prospecting target in the east of Laogoku.All these provide the basis for the subsequent surveying work. |
PDF Full Text Request