Since the beginning of the Yanshan period,the eastern Hebei has entered the stage of mantle branch structure activity,and the mantle branch structure in eastern Hebei has controlled large-scale magmatic intrusion activities and gold mineralization.There are several"Great Wall type"gold deposits along the Lengkou Fracture Zone,which are mainly controlled by the peripheral detachment slip zone and belong to structure control of ore,the main detachment slip zone provides a channel for the transport of gold-forming fluids,and the secondary detachment slip zone,interlayer slide zone and fractures and joints in the cover rocks provide enrichment space for the mineralized material,with the characteristics of increasing thickness to the deep.It is a remote low-temperature hydrothermal deposit,and the Xiaoyingzi granite magma provides part of the mineralized material for gold formation.
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