Garnet From The Hongqiyingzi Complex Within Kangbo County,North Hebei Provinve:Mineral Chemistry And Genetic Implications

The Kangbao Hongqiyingzi Complex located in the middle of the north margin of North China craton,it is mainly distributed in the south-east Tianjin Guo area of Kangbao County,which is bounded by Kangbao-Weichang fault and Datong-Guyuan fault.The main lithology is garnet biotite plagioclase gneiss and intrusive garnet granite,and contains marble,quartz rock and other lens.The original Kangbao Hongqiyingzi Complex was divided into two parts,namely the Neoarchean metamorphic plutonic and the paleoproterozoic metamorphic intrusive rock body.In this investigation,it was found that the actual case of the Sujifang supracrustal rock and Xiaonao garnet granite,of which the case of the Sujifang supracrustal rock is mainly garnet biotite plagioclase gneiss,garnet granite distribution in Tianjin Guo,Niujiaying area,that is the Xiaonao Gneiss and Tianjin Guo Gneiss,the investigation found that it only occurred in deformation(tablets),not metamorphic.The Shipeng garnet granite in the north of Kangbao-Weichang fault is mainly distributed in Shipeng,Hounao,Lujiaying and so on,which invaded the the older granite bodies of the age in late Paleozoic.The supracrustal rock of the Sujifang case is widely distributed in the research area,which is distributed in the Sujifang,Qianamingdai,Yihusai and other places,as the main lithology of the Garnet biotite plagioclase gneiss mineral assemblage is quartz,feldspar,garnet,biotite,sillimanite,garnet fracture development,many of the aggregate output,in the garnet inside a large number of needlelike sillimanite,in the vicinity of the mineral pillars of sillimanite,some of the Garnet was confessed to the island-like.Almandine and Pyrope garnet occupies an absolute advantage in more than 90%,belonging to the Almandine and Pyrope Garnet series,the obvious rich MgO,poor MnO,belong to metamorphic Genesis Garnet.The main mineral assemblages of the Xiaonao garnet granite include quartz,feldspar,biotite,garnet and so on,the garnet belongs to the Almandine and Pyrope Garnet series.the garnet of Niujiaying is coarse in the area,The orientation of minerals is obvious,and the Tianjin Guo granule is finer,There is no obvious orientation of minerals,the aggregate output is more,and the inner of the aggregate is quartz,feldspar,biotite and so on,mostly with cracks,cracks are mostly biotite or sericite,such as filling;Tianjin Guo garnet has relatively high MgO,MnO content and Low Fe O,CaO content,the garnet core is a metamorphic garnet part of the melting residual particles,the edge of magma dissolved and then precipitation;There are relatively low MgO,MnO content and high FeO and CaO content in the Niujiaying garnet,the garnet is completely dissolved by the magma and then precipitation,for the magma Genesis Garnet.Kangbao Shipeng garnet granite mineral assemblages are mainly quartz,feldspar,muscovite,garnet,etc.,part of the Muscovite also appear sillimanite,garnet is the aggregate body,belonging to the Almandine and Spessartine Garnet series,With high MgO content,FeO content changed little,for the magma Genesis Garnet.The Sujifang supracrustal rock and the Xiaonao garnet granite garnet belong to the Almandine and Pyrope Garnet Series,the mineral chemical composition is similar,at the same time,there are differences and links in the Genesis,and the host rocks of the two are closely adjacent to each other in the spatial distribution.It should be the case that the partial melting of garnet occurred in the The Sujifang supracrustal rock.The slightly different compositions of garnet in two garnet granite bodies were not complete in the process of deep melting,and the characteristics of residual metamorphic garnet were preserved in Tianjinguo Garnet.While the Niujiaying Garnet is completely dissolved and precipitated,the magma Genesis is more remarkable.