The Characteristics Of Enclaves Riched In Iron In The Intrusive Rocks And Its Significance To The Origin Of Hanxin Type Iron Deposit In Fushan,Shexian County,Hebei Province

The Hanxing area is located in the central part of the North China Craton,the middle-south section of the Taihang Mountain Inner Orogen;Fushan is located in Wu'an City and Shexian County,Hebei Province,an important iron ore base in China;A set of medium-basic complexes have been developed in Fushan area,among which there are many types of inclusions in porphyritic hornblende;iron-rich inclusions are the process of magma(iron-rich melt)reformation,migration and evolution The middle magma channel was captured and carried from the deep mantle or crust.In this paper,the porphyritic hornblende diorite and the mineral assemblages in iron-rich inclusions and porphyry porphyry are studied in detail,and then the source of the metallogenic material of the Hanxing iron ore and the evolution of Fushan magma are discussed.Iron-rich inclusions are mostly round and elliptical;the long axis diameter is about 2-8cm,the boundary between the inclusion and the host magma is straight and straight,and the common particle structure and flow characteristics.The main minerals in Fushan iron-rich inclusions are: plagioclase(35%-40%),potash feldspar(5%-15%),hornblende(5%-10%),pyroxene(10%-15%)),Magnetite(20%-25%);accessory minerals are: apatite(less than 5%),quartz(about 1%),etc.The main minerals of iron masses are: magnetite(10%-15%),hornblende(20%-30%),plagioclase(20%-25%),potash feldspar(5%-15 %),Pyroxene(about 5%);accessory minerals are: apatite(less than 4%),epidote(2%-3%),rutile(about 2%),quartz(about 1%),etc.;The main minerals in the host rock mass are: plagioclase(45%-50%),potash feldspar(5%-15%),hornblende(25%-30%),magnetite(5%-10 %),Pyroxene(about 5%);accessory minerals are: apatite(less than 5%),quartz(about 3%),etc.The study found that the mineral combinations in iron-rich inclusions and iron clusters are: 1.Sodium feldspar + magnetite + apatite + diopside + actinolite,2.Sodium feldspar + hornblende + Magnetite + Apatite + Rutile,and classify the single minerals in host magma,iron-rich inclusions and iron clusters,and find that the magnetite belongs to the magma type and the kiruna type.According to the mineral assemblage and structural characteristics of iron-rich inclusions and plaques,it is speculated that the deep iron ore intruded into the upper magma chamber,and was captured by other invading magma during the evolution process,and was enriched by iron-rich inclusions and iron mass The spot form exists in the host magma.According to the calculation formula of Ridolfi(2010),the temperature and pressure of the host magma,iron-rich inclusions,and hornblende in the iron clusters are calculated,and then the depth is estimated.Then speculate on the evolution of magma.