摘要
华北富磷碱性-偏碱性杂岩的岩浆成分和岩浆熔体结构对岩浆的含磷性和磷的富集起着控制作用。磷的富集作用发生在岩浆起源阶段和岩浆分异作用(岩浆不混溶作用、结晶分异作用)阶段。在这两个阶段的演化过程中,P_2O_5含量及其变化趋势严格受岩浆成分、熔体结构(如NBO/T,M/F)和α_(SiO_2)、μ_(K_2O)控制,表现为P_2O_5含量与SiO_2、K_2O、K_2O+Na_2O及CaO/(MgO+SiO_2)等有密切关系。
The phosphorus deposits associated with the complexes enriched in phosphorus are one of the common magmatic types. In this paper the inherent relations of magma chemistry with phosphorus potential, melt structure controlling on phosphorus potential of the magma and magmatic process for enrichment of phosphorus are discussed. It suggests that the source containing Phl and Ap and enriched in some trace elements in the prcess of mantle metasomatism, had melted to form the mafic magma enriched in potassium, phosphorus and incompatible trace elements in some areas of northern China. The silicate liquid immiscibihty led phosphorus to move and be concentrated. Crystallization of unmixed magma (pyroxenitic magma unit) caused phosphorus to be further concentrated. P_2O_5 content in the magma and its evolution tendency were controlled by melt structure of magma(M/F, NBO/T) and ~αSiO_2, αK_2O. Chemically, there is a close relation between P_2O_5 and SiO_2, K_2O, CaO/(MgO+SiO_2)in magmas.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
1992年第3期222-223,共2页
Acta Petrologica Sinica
基金
国家自然科学基金830968号项目部分成果
关键词
杂岩
磷碱性
偏碱性
岩浆
含矿
Magma chemistry
Melt structure
Phosphorus potential
