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滇川黔接壤区位于扬子地块西南缘,是NS向小江断裂带、NE向师宗-弥勒断裂带和NW向紫云-垭都断裂带夹持的一个复杂地块。地块内构造以NE走向的隔档式褶皱及叠瓦状逆断层为特征,在遥感影像上形成NE向紧密条纹条带与宽缓的菱格状地块相间分布的景观特征。但在云南彝良毛坪-贵州威宁地区却存在一个NS轴向的透镜状环块构造,镶嵌于NE向的条带状区域背景景观之上(图1)。其地理位置对应于彝良毛坪矿化集中区,故称之为毛坪环块。
The junction of Yunnan, Sichuan and Guizhou is located in the southwestern margin of the Yangtze block and is a complex block sandwiched between NS to Xiaojiang fault zone, NE to Shizong-Maitrei fault zone and NW to Ziyun-Yadu fault zone. In the block, the NE-trending paddling fold and imbricate thrust faults are characterized by the formation of the landscape features of NE-tight striped stripes and broad-grained rhombic-shaped patches on remote sensing images. However, there is an NS axial lenticular ring block in the Maoying-Guizhou Weining area of Yiliang, Yunnan, which is embedded in the background landscape of the stripe-like area in the NE direction (Figure 1). Its geographical location corresponds to Yuli Mao Ping mineralization area, so called Mao Ping ring block.