四川阿坝州党坝超大型锂辉石矿床成矿规律及深部和外围找矿方向
The Metallogenic Regularity, Deep and Periphery Prospecting of Dangba Superlarge Spodumene Deposit in Aba, Sichuan Province

党坝矿区位于松潘－甘孜稀有金属成矿带东段，可尔因矿田的东南部，是我国超大型锂辉石矿床之一.为了解该矿床地质特征及成矿规律，查明工作区深部及外围地质找矿方向，梳理了现有工作成果和野外地质观察结果，总结工作区岩浆岩岩相的空间变化特征、控岩控矿构造力学特征，对成矿规律进行了深入分析.研究表明：(1)党坝矿区主矿脉Ⅷ是2期成矿作用叠加、复合形成的钠长石锂辉石+锂云母型伟晶岩脉，每期伟晶岩脉内构造分带明显，自外向内分别是锂云母钠长石伟晶岩带、白云母钠长石伟晶岩带、锂辉石钠长石伟晶岩带；(2)主成矿期的应力场为EW向挤压，形成了矿区内的NW向和NEE向2组剪裂隙，伟晶岩脉充填其中，形成了呈“X”型分布的伟晶岩脉带；(3)以Ⅵ矿脉为成岩成矿中心，NW走向的伟晶岩矿脉带向南东侧伏，NE走向的伟晶岩矿脉带向北东侧伏，为工作区开展深部及外围地质找矿指明了方向.
The Dangba pegmatite-type spodumene deposit, located in the southeast of Keeryin orefield, also in the eastern part of Songpan-Ganze rare metals ore-forming belt, is one of super-large spodumene deposits in Sichuan, China. In order to find out the ore-forming potential in the deep and periphery, combined the previous research results and field geological observation, this paper summarized the spatial variation characteristics of magmatic rock facies and the mechanical characteristics of rock controlling structures in mining area, deeply analyzed the metallogenic regularity, and proposes the direction of geological prospecting. It is concluded that: (1) The main vein Ⅷ in Dangba mining area is albite spodumene+lepidolite type pegmatite vein formed by two-stage mineralization of superposition and recombination. The pegmatite intrastructural zoning is obvious in each period, with the lepidolite albite pegmatite belt, the muscovite albite pegmatite belt, and the spodumene albite pegmatite zone distributed from the outside to the inside; (2) Being controlled by the NW-trending and NEE-trending structures, the mineralized pegmatite belts show a trend of “X” type distribution; (3) Being centered around the diagenetic mineralization ,vein Ⅵ NW extensional veins pitch to south east, and the NE extensional veins pitch to north east. This study indicates the direction of the deep and peripheral geological prospecting for Dangba spodumene deposit