中国地调局地科院地质所在雅鲁藏布江缝合带西段普兰岩体中首次发现了共存的高铬型和高铝型铬铁矿。而在此前全球已发现的豆荚状铬铁矿中,同一岩体内一般只存在一种类型的矿体。因此,这一发现对于普兰地区的找矿工作有启发和指导意义。普兰岩体由地幔橄榄岩(方辉橄榄岩、纯橄岩和少量二辉橄榄岩)、辉长辉绿岩和火山岩等组成,其铬铁矿矿体的矿石类型主要有致密块状、稠密浸染状和稀疏浸染状等。该铬铁矿矿体长2~6m,厚0.5~2m,最大延伸方向为北西一南东向,与展布方向 China Bureau of Earthquake Research Institute of Geology in the Brahmaputra suture along the western section of Pulan rock mass coexistence was found for the first time the high-chromium and high-aluminum chromite. In the previously found podiform chromite in the world, there is generally only one type of ore body in the same rock mass. Therefore, this finding is enlightening and instructive for prospecting work in the Pulan area. The Pulan rock mass is composed of mantle peridotites (Hatch Chrysalis, dullestite and a small amount of lherzolites), gabbro and volcanic rocks. The ore types of the chromite ore bodies are mainly composed of dense blocks and dense Disseminated and sparse disseminated and so on. The chromite ore body is 2 ~ 6m long and 0.5 ~ 2m thick. The maximum extension direction is northwest-south-east direction,