A Genetic Mineralogic Study on the Archaean Metamorphic Iron Deposits in Ban jieyu Region,Miyun Diatrict in Beijing
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    Abstract:

    The systematic determinations of the chemical compositions, physical pro- perties, crystal structures and the fabric characteristics of 37 samples of pyro- xene, garnet and magnetite collected from the iron-bearing formation have been made. On the basis of these data connecting with the nature of the prim- ary rocks it may be considered that the iron deposits in this district are meta- morphic volcanosedimentary iron deposits. The disi:ribution coefficients of Fez+, Mg, Mn between these minerals axe nearly constant. In comparison with the distribution coefficients of Kondapalli granulate, Madras granulite and Ruby granulite, we found that they are very similar. It may be concluded that physicochmical balance was attained in the process of metamorphism and the metamorphic facies in the district belongs to the granulitic facies. The P-T conditions of metamorphism in this district have been determi- ned by using four methods of pyroxene geothermometer. The temperature of metamophism was about 750-800℃. and the pressure was about 7-9 Kb.

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周鸿勳,1983,北京密云半截峪一带太古代变质铁矿的成因矿物学[J].岩石矿物学杂志,2(3):197~205.,1983,A Genetic Mineralogic Study on the Archaean Metamorphic Iron Deposits in Ban jieyu Region,Miyun Diatrict in Beijing[J]. Acta Petrologica et Mineralogica,2(3):197~205.

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