Study On The Geological Characteristics And Enrichment Regularities Of Mineralization Of Hutouya Copper-iron Deposit,Qimantage,Qinghai Province

Hutouya mine is located in Qimantage area,East Kunlun,North Kunlun fault in the north,north of the mausoleum of gol fracture,polymetallic deposit of its development,this paper focuses on the research of the north section and the section of the middling area.In a variety of strata,and the mineralization of the strata of Langyashan group rocks,Ordovician Silurian Tanjianshan group volcano rock group,the lower Carboniferous Dagangou group and the upper Carboniferous Association Su Ao group.There are a large area of intrusions in the area,the main lithology is two long granite and granodiorite.From the study on petrology show: two long granite in Late Triassic three formed in the post collision environment in the Paleo Tethys ocean closed completely and enter the intracontinental orogenic stage;tectonic background in three Triassic granodiorite pluton formed in the subduction environment.The development of fault structure in the area,area of NW and NWW faults in the mining area where the tectonic convergence,as the main east-west tectonic,polymetallic ore bodies mainly occur in the east-west fault,the second part is formed in the secondary structure.The 10 mineralized belts divided into 117 ore bodies are mostly accumulated in the contact zone between the formation and the rock mass.There is a close relationship between the mineralization belts: iron ore is the main ore belt in the No.1 and No.3 ore belts,while the iron ore and copper ore bodies are the main minerals in the No.2 ore belt,while the others are copper,lead and zinc polymetallic ore bodies.Ore types include tin iron ore,magnetite ore,copper lead zinc ore,tin copper ore,tin ore,tin iron ore,molybdenite ore and so on.The internal alteration of skarn rocks mainly includes skarn,epidote,chlorite,diopside,silicification and so on.Through the experiment of Hutouya ore fluid two-phase gas-liquid inclusions in temperature peak at 280~340? range,the ore-forming fluid has the features of high temperature in the pressure range of 30~75MPa;mineralization,metallogenic depth value is 2.5km~3.09 km.In ore-forming materials,sulfur comes mainly from deep source magmatic sulfur,and has a small amount of sulfur from surrounding rocks.In the process of ore-forming fluid migration,it is also possible to extract various kinds of sulfur from crustal materials.The main source of ore-forming fluid is magmatic water,and other fluids,such as meteoric water,are involved in the later stage superimposition.According to the East Kunlun Qimantage area during the late Paleozoic to early Mesozoic tectonic magma continuous evolution of Hutouya deposit had undergone compression to extension transformation,due to the interaction of crust and mantle in acidic magma,ore deposits obtained large amount of metallogenic material.The ore-forming materials gradually enriched and separated along with magmatic hydrothermal solution in late crystallization stage.They formed carbonate rocks along the contact surface and fracture into carbonate formation and metasomatism with the surrounding rock.Because of the change of physicochemical conditions of hydrothermal fluids,the ore-forming materials carried by hydrothermal fluids are precipitated and enriched,forming deposits in this area.So it is considered that the genetic type of polymetallic ore deposit is skarn type deposit.Based on the results of all the studies on the Hutouya copper iron polymetallic ore enrichment regularities of mineralization are summarized,acidic rock and carbonate rock strata,contact zone and fault structures are to control deposit,wall rock alteration and tectonic superposition have affected the enrichment of mineralization,the metal elements obviously zonation also shows certain enrichment of mineralization regularity.