Geological Characteristics And Genesis Of Kanchuangou Gold Deposit In Muling County Heilongjiang Province

The Kanchuangou Au deposit is located in the estern part of CAOB Jiamusi massif,which belongs to Jiamusi-Mudanjiang polymetallic metallogenic belt.The ore bodies occurred in Marattiopsis and mylonitized granite,obviously,all of them are under control of NE-trending structures.Based on the achievements and data of past scholars,we carried out field observation and laboratory study,and the following knowledge has been obtained:The orebody of surrounding rock in Heilongjiang group Jinmantun + Laogou group(Pt1j + 1)tectonic altered rock or marble marble edge,orebody strip,strip along the north east to fracture distribution,two ore bodies were found in this area,wall rock alteration are mainly carbonatization lithification,zeolite and Angle.Carbonatization,zeolite,the main development in diorite,carbonate minerals in thin layers distribution in rock fracture and zeolite are thin net vein.Zircon dating of syenogranite and mylonitized granite testify that the formation time are 238.9 ± 1.2 Ma and 135.4 ± 1.0 Ma,respectively.The mineralization is closely related to mineralization mylonitization granite formed in early cretaceous.Late yanshanian,formed a series of related to magmatic activity in the study area of neutral-acid small rock mass,rock strain and so on,the tectonic setting shall be the Pacific plate subduction and mantle plume effect caused by the asthenosphere upwelling and lithosphere thinning and crust-mantle interaction.The results of geochemical annalysis show that mylonitized granite which is closely related to mineralization formed in Yanshanian,belongs to A-type granite.The ore-forming materials may be derived from the mantle.Syenogranite is the production of magmatic of the transition of tectonic,which occurs in late period of Indocinian,contains a part of crustal material;the protolithes of granulite is argillaceous sedimentary rock.According to orebody characteristics,ore feature and geochemical signature of minerogenic rock,we consider that the desposit is hydrothermal metasomatism type gold deposit,and is closely associated with the subduction of the Pacific plate to Eurasian plate in Mesozonic era.The late ductile shearing enriched Au,made further efforts to form Kanchuan gou gold desposit.The Kanchuangou gold ore deposit is belongs to hydrothermal metasomatic type gold deposits,which formed in the tectonic environment related to plate subduction.