Origin of the disseminated magnetite pyroxenite in the Tieshanmiao-type iron deposits in the Wuyang region of Henan Province, China

The Tieshanmiao-type iron deposits in the southern North China Craton comprise two types of ores: banded pyroxene–magnetite quartzite (BMQ) and disseminated magnetite pyroxenite (DMP). Whether the quartz-poor DMP represents metamorphosed iron-bearing ultramafic rocks or chemical sedimentary rocks is still unclear. Pyroxene compositions in the DMP are low in Al2O3 and TiO2, which are similar to those from the BMQ and altered marble and...