| Jiapigou metallogenic belt is located at the intersection grounding zone of the eastern end of the northern margin of the North China Platform and Xingmeng orogenic belt.It is situated at the compound part of Huifahe fault and east-west tectonic belt.TTG grey gneiss and epicrust rocks dominate the south-west side and Xingmeng orogenic belt that consists mainly of large areas of Paleozoic and Mesozoic granites and Paleozoic meso-shallow metamorphic rocks locates north east side.The metallogenic belt is a multi-arc metamorphic belt controlled by NE-trending Huifahe,Liangjiang and NW-trending Jiapigou faults.The belt is rich in mineral resources,mainly gold deposits,accompanied by non-ferrous metal deposits such as Cu,Ag,Zn,Pb,Fe,and non-metallic minerals such as potassium feldspar and porcelain stone.The study shows that the prospecting model of Jiapigou metallogenic belt is as follows.1.Rock type:The rock types are plagioclase amphibolite,biotite granulite,amphibolite quartzite and a few ultramafic metamorphic rock assemblages of Neoarchaean epicrust rocks(also known as granite-greenstone terrane).2.Metallogenic epoch:In this study,the upper limit of metallogenic epoch was established to be 186 Ma.3.Tectonic setting:The tectonic setting is the transitional stage from the early Jurassic to the middle Jurassic in Pre-South China East North China Block(II)Longgang-Chentaigou-Yishui Pre-Neoarchaean Block(III)Neoarchaean Block.4.Metallogenic environment:The Huifahe-Gudonghe deep fault protrudes northward to form an arc-shaped top or anti-S structural system.Affected by the NW-Fuping fold axis and ductile shear,the deposit has multiple ductile-brittle tectonic superimposition in the later stage of ductile shear zone,forming a multi-stage compression fracture zone.Gold deposits are located at the axis,steep wing or dipping end of fold structure.The Erdaogou Gold Mine and Sandaocha Gold Mine are spatially compatible with the ductile shear zone.5.Mineralization alteration:Alteration types are K-feldspar-biotite,epidote-chlorite,sericitization-silicification,muddification,calcification and iron dolomitization in turn from outside to inside.The main mineralization types are pyritization and pyrite+chalcopyrite.6.Ore control conditions:The continental margin continental-continental collision zone and ductile shear zone control the distribution of Jiapigou orefield.The inherited ductile-brittle structure superimposed on the ductile shear zone and the towed brittle structure are host structures.The development of intermediate-acid rocks in each stage is closely related to ore space.Late-stage rocks and dikes have higher gold-bearing abundance.7.Geochemistry:Regional geochemical anomalies are characterized by large scale,clear zoning,obvious concentration center and high intensity.The enrichment and superimposition geochemical field of complex element components composed of assemblage anomalies is conducive to the further migration,enrichment and metallogenesis of major metallogenic elements.Among the 1:50000 drainage system sedimentary anomalies and 1:10000 soil geochemical anomalies,the main elements are gold,silver,lead,zinc,copper and bismuth.Their combination anomalies can provide a basis for indicating the location of ore bodies.8.Aeromagnetic survey:The scale of negative(weak)magnetic field zone is larger.Top of the turning point of NW-NE gravity cascade zone between gravity high anomaly distribution area and gravity low anomaly area reflects the characteristics of joint control of two groups of fractures.9.Remote sensing:The densely distributed areas of NE-trending and NW-trending faults with different scales and their intersections are well developed in brittle-ductile deformation tectonic zones in all directions,concentrated distribution areas of ring structures related to concealed rock masses,remote sensing light tone anomaly areas,remote sensing hydroxyl anomaly and iron stain anomaly uniformly distributed.10.Prospecting criteria:Alteration is an important prospecting indicator in this area.Sedimentary anomalies of 1:200,000 River system,1:50,000 river system and 1:10,000 soil geochemical anomalies show that the main anomalies are gold,silver,lead,zinc,copper and bismuth.Gold heavy sand anomaly is obvious. |
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