水洞岭地段应用铅同位素方法找矿评价的研究

应用铅同位素方法，对水洞岭和桑树坪区段的铅同位素特征与桐柏大河铜锌矿床进行对比，认为水洞岭地段寻找优地槽块状硫化物层控型矿床有利，深部找铜矿有一定希望。     

变质岩型铜矿床稳定同位素地球化学特征及成矿机理

我国主要的变质岩型铜矿床Ｈ、Ｏ、Ｓ、Ｃ、Ｐｂ同位素研究结果表明，成矿热液具热卤水和地热水特征，成矿物质属深部来源，此外，不同程度的区域变质作用对变质岩型铜矿床的同位素的组成和分布亦产生一定的影响。总的来看，我国主要的变质岩型铜矿床与裂谷坳陷带大型喷气热液活动有关。     

The Coupled Re—Os and Pt—Os Systematics：A Theoretical Consideration

The ^190Pt-^186Os system should be a unique tracer for mantle processes be-cause both Pt and Os are concentrated in the mantle.The ^190Pt-^186Os system will also be a good supplement to the ^187Re-^187Os system for dating and tracing mantle pro-cesses because the ^190Pt-^186Os system is not so easily contaminated by crustal materials as the ^187Re-^187Os system.In turn,the application of the ^187Re-^187Os system to Pt-enriched materials uncontaminated by crustal materials will indirectly refine the half life of ^190Pt.The ^190Pt is refined.In the coupled ^187Re-^187Os and ^190Pt-^186Os sys-tematics,an ^186Os*/^190Pt-^187Os*/^187Re Concordia diagram similar to the ^206Pb*/^238U-^208Pb*/^232Th Concordia can be constructed.In such a Concordia diagram,a date will be obtained so long as the ^190Pt-^186Os system remains closed even if the ^187Re-^187Os sys -tem is contaminated by crustal materials.In addition ,for the coupled ^190Pt-^186Os and ^187Re-^187Os systematics,the mantle processes and the interactions between the mantle and the crust will be described by two ratios:^186Os/^188Os and ^187Os/^188Os .The coupled ^187Re-^187Os and ^190Pt-^186Os systematics will be a powerful tool in the investigation of the geodynamic history of the Earth because the ^187Re-^187Os system is sensitive to the interactions between the mantle and the crust,while the ^190Pt-^186Os system is a good tracer for mantle processes.     

Implications of εNd—La／Nb,Ba／Nb,Nb／Th Diagrams to Mantle Heterogeneity—Classification of Island—arc Basalts and Decomposition of EMII Component

A group of εNd/Nb,Ba/Nb,Nb/Th diagrams are used to study mantle heterogeneity.Island-arc basalts(IAB) are distributed in a triangle of these diagrams. Three end-member components (the MORB-type depleted mantle, the fluid released from subducted oceanic crust and the sediments from the continental crust) of the source of IAB may be displayed in these diagrams. Two types of IAB are identified .They are of the two-component type (with little continental sediments), such as the basalts from Aletians and New Britain ,and the three-compeonent type, such as those from Sunda, Lesser Antilles and Andes. In addition ,the EMII type mantle-derived rocks may also be divided into two groups. One is exemplified by continental flood basalts and some peridotite xenoliths, similar to IAB, with high La/Nb and Ba/Nb and low Nb/Th ratios, The other includes the Samoa-type oceanic island basalts, with low La/Nb and Ba/Nb and high Nb/Th ratios. The corresponding two sub-components of EMII are EMIIM, which is related to the metasomatism of lithosphere mantle by fluids released from the subducted oceanic crust, and EMIISR, related to the intervention of recycling continental sediments into the convective mantle.     

华南金矿二元混合成矿模式

根据华南六个有代表性金矿的成矿时代、断裂构造、围岩、侵入岩、中基性岩墙、成矿类型、成矿阶段，矿石组成、成矿温度、包裹体成分以及稳定同位素等多方面研究，发现华南大部分金矿具有共同特征；主要成矿时代为燕山期，远落后于围岩时代；是沿地壳级大断裂形成的后生矿床，六个金矿的铅同位素组成可分出高值区（组）和低值区（组），表明成矿物质有深浅两个不同来源；不同金矿氢、氧同位素指示成矿热液水为深源岩浆水与古大气降水     

白云鄂博矿区磷灰石氧同位素研究

通过新建立的BiPO4转化法，笔者分析了白云鄂博矿区部分磷灰石的氧同位素组成，其变化范围为6．3‰～9．4‰，并通过与各种产状磷灰石及不同时代磷酸盐沉积的氧同位素对比、磷灰石形成温度的计算，以及磷灰石Sr－Pb同位素数据的分析，推断矿区磷灰石的形成可能与热水沉积作用有关。     

中国东部新生代火山岩的地质特征及火山作用发育的某些共同规律

中国东部从黑龙江到海南岛的广大范围内新生代玄武岩广泛发育。根据构造关系笔者把本区划分为三个部分：北、中和南构造地块。新生代火山作用在时空上表现出明显的分带。从老到新，火山作用演化的特点是ＳｉＯ２饱和程度减少，碱金属和镁含量增加。从南构造地块到北构造地块出现的玄武岩各具特色。从东南沿海向西北方向，即从东南沿海断裂经长白山－郯庐断裂到大兴安岭－太行山断裂方向，是地壳厚度增加的方向，新生代火山活动的演化     

当代地球化学研究的某些新进展（Ⅱ）

当代地球化学研究的某些新进展（Ⅱ）魏春生（中国科学院地球化学研究所，贵阳５５０００２）关键词同位素地球化学，同位素示踪，同位素地球化学分析技术，同位素分馏１同位素地球化学理论与实验研究的进展（１）氧同位素理论分馏方程研究的重大突破：继Ｕｒｅｙ（１９４...