江苏沉积变质型磷矿构造制约机制与找矿方向

江苏沉积变质型磷矿带位于大别—苏鲁造山带东段，锦屏岩组是带内唯一赋矿地层，因其遭受过多期强烈变形变质作用改造，层序杂乱，勘查难度大。通过对磷矿带内各矿床地质特征的研究，查明区域早期复式褶皱构造控制着带内磷矿体的空间分布、厚度及品位，晚期复式褶皱构造制约着含磷岩系的总体分布；结合区域及各矿区的地球物理资料，建立了覆盖区隐伏磷矿的地球物理勘查模型，认为在面积性重力高异常区内，局部叠加剩余重力高异常，且伴随平缓正磁异常的地段是隐伏磷矿勘查的首选目标；通过钻探进行验证，在此基础上圈定了3处找矿靶区，为后续磷矿勘查指明了方向。

Tectonic constraint mechanism and prospecting direction of sedimentary metamorphic phosphate deposit in Jiangsu Province

The sedimentary metamorphic phosphate ore belt in Jiangsu Province is located in the eastern part of the Dabie-Sulu orogenic belt. The Jinping Rock Formation is the only ore-bearing stratum in the belt. Due to multiple periods of intense deformation and metamorphism, its sequence is disordered and difficult to explore. Through the study of the geological characteristics of various deposits in the phosphate ore belt, the paper shows that the early regional compound fold structure controls the spatial distribution, thickness and grade of the phosphate ore body in the belt, and the late compound fold structure controls the overall distribution of the phosphate rock series. Based on the geophysical data of the region and each mining area, the geophysical exploration model of the concealed phosphate ore in the coverage area is established. It is considered that the section with local superimposed residual high gravity anomaly which accompanied by gentle positive magnetic anomaly is the preferred target for the exploration of the concealed phosphate ore in the area of regional high gravity anomaly, which has been verified by drilling. On this basis, three prospecting targets have been delineated, indicating the direction for subsequent phosphate ore exploration.