一、绪言地处我国西南的西昌—渡口地区(简称攀西地区),广泛分布基性、超基性岩体(图1)。其中层状岩体和相关的矿产,已名闻中外,是世界重要钒钛磁铁矿区之一。在本区对基性、超基性岩及其赋存矿产进行过工作的有中国科学院贵阳地球化学研究所,中国地质科学院矿床地质研究所,成都地质矿产研究所,成都地质学院,四川省地质 I. INTRODUCTION It is located in the Xichang-Dukou area in the southwest of China (Panxi area for short) and is widely distributed with basic and ultrabasic rock mass (Figure 1). Among them, layered rock mass and related minerals are famous both at home and abroad and are one of the most important vanadium-titanium magnetite mines in the world. Guiyang Institute of Geochemistry, Chinese Academy of Geological Sciences, Institute of Geology and Mineral Resources, Chengdu Institute of Geology and Mineral Resources, Chengdu Institute of Geology, Geology of Sichuan Province