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一、弓长岭石榴石的成因弓长岭二矿区的含铁建造为太古代硅铁建造而非碳酸盐建造,故有利于形成非钙榴石,而不利于形成钙榴石.该矿区条带型贫铁矿类型有磁铁石英岩、赤铁石英岩、阳起石磁铁石英岩、绿帘石磁铁石英岩、普通角闪石磁铁石英岩;隐纹型富铁矿类型有石英磁铁矿、镁铁闪石磁铁矿、绿泥石磁铁矿、石墨磁铁矿.贫矿含TFe27～39%,SiO_232～48%;富矿含TFe54.72～67.91%,SiO_22.28～21.58%.两者均有较多的硅铁,有利于形成铁铝榴石.但硅铁矿体中缺铝,故铁铝榴石又较少见.此类硅铁矿体变质前原为胶体沉淀,故当围岩中
First, Gongchangling Garnet Cause Gongchangling two iron ore area is built for the construction of Archean iron rather than carbonate, it is conducive to the formation of non-garnet, but not conducive to the formation of garnet. The banded-type lean iron ore types include magnetite quartzite, hematite quartzite, pyrophoric magnetite quartzite, ettringite magnetite quartzite and common hornblendite magnetite quartzite. The invisible iron-rich ore type includes quartz magnet Mine, mafic magnetite, chlorite magnetite and graphite magnetite.The lean ore contains 27-39% of TFe and 32-48% of SiO2, and the content of TFe is 54.72-67.91%, and the content of SiO2 is 22.28-21.58% Both have more ferrosilicon, is conducive to the formation of alluvial, but the lack of aluminum in the ferrosilicon ore, it is rare almandine. Such ferrosilicon ore body before the original colloidal precipitation, Therefore, when the rock around