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给农作物施用的磷肥主要来源于海相磷块岩矿床。按照以往地质学者提出的成矿模式,磷块岩只能在低纬度区,温暖气候环境中形成。谢尔顿(Sheldon,1964)认为磷块岩形成于古纬度5°—42°,平均23°;库克(Cook,1980)则强调:“在纬度40°将无磷块岩形成。最近,南非地质工作者在二叠纪沉积岩中发现了冰川成因的条带状磷块岩矿床,其形成条件与传统认识迥然不同。
Phosphate fertilizer applied to crops mainly comes from marine phosphorous rock deposits. According to the mineralization model proposed by the geologists in the past, phosphorite rock can only be formed in the low latitude area and the warm climatic environment. Sheldon (1964) argues that phosphorite is formed at an ancient latitude of 5 ° -42 ° with an average of 23 °; Cook (1980) emphasizes: ”No phosphorous is formed at latitude 40 °, , Geologists in South Africa found glacial-genetically banded phosphorite deposits in Permian sedimentary rocks, and the formation conditions are quite different from the traditional understanding.