混合岩化作用改造的铬铁矿床

A MIGMATIZATION-ALTERED CHROMITE DEPOSIT

Discussion has been given to the geology and origin of a certain chromite deposit from a viewpoint of migmatization. 47 chromite orebodies have been discovered in this area. All of them, variously shaped as irregular lens, chambers, kidneys,etc., occur in migmatite, showing dear-cut contacts with the latter. Mineralogical composition of these deposits are exceedingly simple, composing mainly of chromium phlogopitc and chromite and, to the less extent, of pyrite, chalcopyrite, galena,rosite aaad etc. The pre-existing chromite deposit, which is magmatic in origin, is decply altered by migmatization, eventually giving rise to metamorphosed chromite deposits as are seen at present day.

Discussion has been given to the geology and origin of a certain chromite deposit from a viewpoint of migmatization. 47 chromite orebodies have been discovered in this area. All of them, variously shaped as irregular lens, chambers, kidneys, etc., occur in migmatite, showing clear-cut contacts with the latter. Mineralogical composition of these deposits are exceedingly simple, composing mainly of chromium phlogopite and chromite and, to the less extent, of pyrite, chalcopyrite, galena, rosite and etc. The pre-existing chromite deposit, which is magmatic in origin, is deeply altered by migmatization, eventually giving rise to metamorphosed chromite deposits as are seen at present day.