江西大吉山花岗岩风化壳稀土矿床稀土元素地球化学

本文系统采集分析了江西大吉山花岗岩体及其风化壳样品，通过研究其不同类型花岗岩风化壳的矿物组成、稀土元素组成和稀土元素的分配，得出了风化壳中稀土元素的分布特征和规律，讨论了风化作用过程中稀土元素的迁移机制。     

Mineralogical and Petrological Studies on Carbonatite Dykes in Bayan Ebo，Nei Mongol，China and Their Implication to Rare Earth Mineralization

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Rare Earths, Niobium and Tantalum Minerals in Bayan Obo Ore Deposit and Discussion on Their Genesis

Bayan Obo ore deposit is endowed with and lie hidden in the Proterozoic strata. The localities and occurfences of the minerals in the ore deposit were described. It is obviously that some minerals are strata minerals and some are post-strata minerals. The rare earths, niobium and tantalum minerals are exactly the post-strata minerals. In these minerals the hydrothermal metasomatic phenomena distinctly reveal their metallogenic characteristics. According to tectonic movement, magma activity, mineral paragenesis, hydrothermal metasomatism, geological age and lasting time-scale of metallogenesis, and some other factors, it is supposed that genesis of rare-earths, niobium and tantalum minerals in Bayan Obo ore deposit are closely related with hydrothermal metallogenic solution which is differentiated from silica acid and carbonic acid magma and derived from deep seated source, and then intruded into Proterozoic strata and metasomatized. It is recognized that the metallogenesis of Bayan Obo ore deposit is undergoing a long geological period and many episodes.     

Geochemical Characteristics of Rare Earth Elements in Guposhan Granite Complex and Their Petrogenetic Implication

In this paper the geochemical characteristics of rare earth elements in Guposhan granite complex in NanlingArea,South China,is systematically studied,and the balance of REE distribution in rock-forming minerals,which contain only 21.47～29.71 wt% of total REE in granites,is calculated.The petrogenetic relationship be-tween three different stages of the granites in the complex is discussed,and a geochemical model is suggested forthe formation of granitic magma in early stage by partial melting of the crustal basement rocks containing moreREE than that in the late stage.It shows that a ion-adsorption type of REE deposit could ocuur in the weath-ering crust on the early stage granite.Rb-Sr isotope isochron dating of the first stage medium-coarse-grainedK-feldspar granite shows that its age is 146.5 Ma and initial ~(87)Sr/~(86)Sr ratio is 0.71198.     

几种矿物中稀土元素激活剂的阴极发光发射光谱及其地质含义

目前,越来越多的关于阴极发光发射光谱(CES)在研究地质样品上的应用充分说明CES正成为矿物学研究的重要手段,并将迅速扩展到地质研究的各个领域。CES在检测矿物中稀土元索激活剂方面显示其独特的地位,它可以灵敏地给出在可见光     

花岗岩中稀土元素的赋存状态及质量平衡研究

本文对花岗岩中稀土元素的赋存状态与质量平衡进行了深入研究,提出应根据岩浆体系成分特征区别对待副矿物和造岩矿物对岩浆演化过程中稀土元素分馏的影响。首次引入描述矿物的蜕晶化程度的物理参数—α衰变辐射剂量D来考查其在地表风化条件下的稳定性,矿物的D值越大、蜕晶作用越强,其抗风能力则越弱,越易在风化条件下分解、释放出稀土离子,极大地控制了花岗岩风化壳的稀土元素配分特征。研究了花岗岩演化过程中的稀土(含稀土)副矿物组合变化特征。     

我国铌钽稀土矿物学及工业利用

该文对我国铌钽稀土矿床及其产出的矿物进行了论述。根据从铌钽稀土元素的地球化学性质，认为地球物质分异是元素地球化学的原始动力。矿物学的核心内容之一是矿物的晶体结构和晶体化学，而铌钽稀土矿物晶体化学问题更占重要位置。在铌钽稀土矿物晶体结构中，铌钽是在假想酸根中呈中等大小的阳离子，而稀土则为阳离子配位多面体中的大阳离子形式存在，以此决定了它们的晶体化学行为。列出了我国产出的铌钽稀土矿物种类和各类各族中的种数，并简要论述了它们的主要矿物学特征。综述了我国铌钽稀土矿床的成矿地质时代和矿床成因类型，并列出各类型矿床中的众多不同产地，以表明矿床类型的多样性和矿化地区的广泛性。还对我国利用这类矿物的特色和可持续发展做出了建议。     

白云鄂博海西期花岗杂岩体的稀土元素地球化学

本文在综合研究白云鄂博海西期花岗杂岩体岩石学特征的基础上 ,系统地分析测定了该杂岩体不同阶段花岗质岩石的稀土元素、微量元素和铅同位素组成 ,提出杂岩体的形成演化由早到晚 ,从花岗闪长岩→中粗粒黑云母钾长花岗岩→细粒黑云母钾长 -碱长花岗岩 ,是下地壳古老变质岩石经部分熔融作用产生的岩浆经不同程度的分离结晶作用所形成。白云鄂博花岗岩属于同碰撞花岗岩 ,形成于蒙古板块与华北板块的碰撞期。白云鄂博花岗杂岩体的稀土元素和微量元素地球化学特征明显不同于白云鄂博 RE- Nb- Fe矿床赋矿白云石大理岩 ,暗示稀土元素的成矿作用与花岗岩岩浆活动没有直接的成因联系。     

白云鄂博海西期花岗岩类成岩地球化学及与稀土成矿的关系

本文对白云鄂博海西期三个不同阶段的花岗岩类的成岩物理化学条件进行了估算,进而讨论了花岗岩类的地球化学特征及成岩方式,指出本区海西期花岗岩类是上地壳岩石经原地—半原地部分熔融所产生的岩浆又经分离结晶作用形成的。通过K_P~(RE)的计算,确定出与花岗熔体平衡的热水溶液的REE分布模式,得出稀土矿化在一定程度上取决于岩浆热液对成矿建造的叠加改造,使得原沉积岩中的稀土元素发生活化转移以致富集成矿。最后,讨论了花岗岩热液中稀土元素的搬运方式。