滇西梁河丝光坪锡矿床的控矿构造

丝光坪锡矿床产于一单斜岩层中,主要控矿构造为F_6;F_(16),F_(15)三条断层。其中,F_6、F_(16)是多期活动的断层,为成矿热液运移提供通道,并控制热液的流向,是该区的导矿构造;F_(15)是形成于F_6和F_(16)较晚期同向扭动下派生的次级应力场中的张性断裂带,为矿液沉淀提供空间,控制矿体的展布,是该区的容矿构造。工业矿体是严格受F_(15)控制在空间上表现为形态多变、尖灭再现的矿脉组,而不是前人所称的单一层状体。

THE ORE-CONTROLLNG STRUCTURE IN THE SIGUANGPING TIN DEPOSIT,LIANGHE,WESTERN YUNNAN

The Siguangping tin deposit is located within a monoclinic stratum.The major ore-controlling structures are three faults: F_6, F_(16) and F_(15).F_6 and F_(16) have undergone multistage activities, they are channeewayswhich provided the flowing channels and controlled the flowing directionfor the ore-forming solution; F_(15) is a late tension fault zone formedin the low-grade stress field derived from the F_6 and F_(16) shear ina direction, it is a ore-host structure offering a space for the precipitationof the ore-forming fluid and controlling the distribution of ore-bodies.The industrial orebodies are strictly controlled by F_(15), they are a groupof ore veins different in shape and pinching-out and repearing end toend alignment in space, but not a formerly called simple layered body.