中国磷矿成矿规律与高效勘查技术组合OA

China is the world's second-largest holder of phosphate rock resources and also a major consumer.Phosphate plays an irreplaceable role in both national food security and the development of new energy industries.Therefore,there is an urgent need to strengthen exploration and evaluation efforts for phosphate resources.Research on metallogenic regularities and the establishment of an efficient exploration technology system are essential for achieving breakthroughs in phosphate prospecting.Based on previous studies,this work systematically summarized the genetic types,metallogenic mechanisms,and spatiotemporal distribution patterns of phosphate deposits in China.It also reviewed and synthesized efficient exploration techniques and their application examples tailored to different types of phosphate deposits.Research indicates that China is endowed with abundant phosphate resources,characterized by large reserves and concentrated distribution.These deposits can be classified into three genetic types:magmatic,sedimentary,and metamorphic.Magmatic-type phosphate deposits are mainly distributed in the northeastern North China Craton and the northeastern margin of the Tarim Basin,with their metallogenic epoch predominantly spanning the Triassic to Cretaceous.Sedimentary-type phosphate deposits are widely distributed in the central and western Yangtze Craton,primarily formed during the Sinian,Cambrian,and Devonian periods.Metamorphic-type phosphate deposits are mainly hosted within the Tongbai-Dabie metallogenic belt and the Sulu metallogenic belt in the North China Craton,with formation ages primarily in the Proterozoic and Archean.Currently,phosphate exploration relies predominantly on geophysical methods,supplemented by geochemical techniques.For magmatic-type deposits,a combination of remote sensing structural interpretation,spectral measurement,magnetic and electrical methods is recommended,with attention to anomalies of F,U,Th,and rare earth elements.For sedimentary-type deposits,exploration should integrate lithofacies and paleogeographic studies with audio-frequency magnetotelluric(AMT)methods and gamma-ray logging,supplemented by analysis of anomalies in elements such as V,Mn,Sr,and Ba.For metamorphic-type deposits,a combination of gravity,aeromagnetic,and AMT methods is advisable,coupled with comprehensive delineation based on anomalies of Fe,P,Ti,and V.Future phosphate exploration should adhere to the principle of prioritizing geological research,selecting efficient technical combinations based on deposit types and specific geological conditions,while also advancing the development and application of new rapid exploration technologies to achieve significant breakthroughs in prospecting deep-seated and covered phosphate deposits.