一、引 言 磷灰石矿床位於江苏省东北部新海连市西南15公里,属旧东海县。 本矿床1919年原开探铁锰矿石,自1920年发现磷灰石以后才开始开採磷矿。 矿床的地质研究工作,自1920年刘季辰调查江苏省北部地质,曾对本矿床做过初步报导。1934年张祖还在本区进行了比较详细的研究工作。以上两位作者对於磷灰石矿床的成因均认为由后岩浆期含磷高温热液交代石灰岩或大理岩形成。1944年黄春江调 I. Introduction The apatite deposit is located 15 kilometers southwest of Xinhailian City in the northeast of Jiangsu Province, belonging to the old Donghai County. The original 1919 iron-manganese ore exploration, since the discovery of apatite after 1920 began mining phosphate rock. Geological research work of the deposit, since Liu Jichen in 1920 to investigate the northern geology of Jiangsu Province, had done a preliminary report on the deposit. In 1934 Zhang Zu also conducted a more detailed study in this area. The above two authors believe that the origin of the apatite deposit is believed to be formed by the replacement of limestone or marble with post-magmatic, high-temperature, pyro-hydrothermal fluids. 1944 Huang Chunjiang tune