Pb同位素三维空间拓扑投影与化探评价

通过对数据集合的拓扑学分析，获得了Pb同位素三维空间拓扑投影特征值V1和V2。运用特征值可以定量地预测隐伏铜金矿床的埋藏深度和隐伏矿量，是隐伏矿预测评价的新方法，开创了同位素化探的新领域。     

辽东裂谷块状硫化物矿床中电气石岩的H、O和Si同位素地球化学

辽东裂谷内分布着一系列块状硫化物矿床，含矿建造及矿层内普遍发育有纹层状电气石岩。电气石岩的H、O和Si同位素地球化学研究表明，其中δD为-50‰—62‰，δ18O值为13.3‰—16.7‰，δSi为0.1‰—0.4‰。H、O同位素组成与典型块状硫化物矿床中的电气石岩完全一致。研究认为矿床中的电气石岩为海底热水沉积成因作用的产物。此类电气石央坏蛋硫化物矿床关系密切，具有明显的成因找矿指示意义。     

橄榄岩中尖晶石的O同位素继承性与晶体结构转换

应用增量法计算的矿物对O同位素分馏曲线，得到正尖晶石-矿物对O同位素温度高于尖晶石在地幔中的熔点，而用反尖晶石-矿物对计算的O同位素温度低于尖晶石的熔点，较为合理。因此，地幔橄榄岩中镁铝尖晶石的O同位素组成可能继承了其母体反尖晶石特征，即使反结构尖晶石在发生相变作用变成正结构尖晶石时未发生O同位素再平衡。     

IAEA-S-1 参考物质及V-CDTS 同位素标准的32S/34S绝对比值

采用高纯S同位素物质和SF6的分析方法对IAEA-S-1参考物质及V-CDT S同位素标准的32S/34S绝对比值进行了实验标定，V-CDT的32S/34S比值为22.6496±0.060，IAEA-S-1的32S/34S比值为22.6564±0.0060.     

中子活化分析在铼—锇法年龄测定中的应用

同位素稀释中子活化分析铼与感耦等离子体质谱法测定锇相结合，应用于辉钼矿及铜＿镍硫化物矿物的铼＿锇年龄测定，取得了满意的结果，扩大了铼＿锇测年法的应用范围。     

泥炭档案气候变化重建的定量模型

泥炭档案气候变化重建的定量模型＊陶发祥洪业汤（中国科学院地球化学研究所，贵阳５５０００２）李汉鼎冷雪天（东北师范大学地理系，长春１３００２４）关键词泥炭档案纤维素稳定同位素气候变化定量模型用泥炭档案定量重建大气ＣＯ２浓度的研究已取得重要进展［１］，但...     

滇黔桂微细浸染型金矿铅同位素组成及应用

滇黔桂微细浸染型金矿铅同位素组成及应用＊刘显凡刘家军朱赖民（中国科学院地球化学研究所，贵阳５５０００２）卢秋霞（成都理工学院，成都６１００５９）关键词微细浸染型金矿铅同位素组成矿质来源上地幔分异混染滇黔桂１矿床地质背景研究区位于扬子地台西南缘与华南加...     

The glacilacustrine sedimentary environment of Bowser Lake in the northern Coast Mountains of British Columbia, Canada

Bowser Lake, a fiord lake in the northern Coast Mountains of British Columbia, contains a thick Holocene fill consisting mainly of silt and clay varves. These sediments were carried into the lake by proglacial Bowser River which drains a high-energy, heavily glacierized basin. Sedimentation in the lake is controlled by seasonal snow and ice melt, by autumn rainstorms, and by rare, but very large jökulhlaups from glacier-dammed lakes in the upper Bowser River basin which complicate environmental inferences from the sedimentary record. Sediment is dispersed through the deep western part of the lake by energetic turbidity currents. The turbidity currents apparently do not overtop a sill that separates the western basin from much shallower areas to the east. Large amounts of silt and clay are deposited from suspension in the eastern part of the lake, but sediment accumulation rates there are much lower than to the west. Several strong acoustic reflectors punctuate the varved fill in the western basin; these may be thick or relatively coarse beds deposited during jökulhlaups or exceptionally large storms. The contemporary sediment yield to Bowser Lake, estimated from sediments in the lake, is about 360 t km^-2a^-1. This is a relatively high value, but it is less than yields insome other, similar montane basins with extensive snow and ice cover.The most likely explanation for the difference is that large amounts of sediment have been, and continue to be, stored on the Bowser delta andin small proglacial lakes.     

甘肃走廊南山朱龙关群的时代及其火山岩的岩石化学特征

甘肃走廊南山朱龙关群是一套以发育大量基性火山岩为特征的浅变质火山沉积岩系，分布于托来山北坡刘口峡山至热水大坂一带以及朱龙关河北侧小柳沟和古浪峡等地。本文在前人工作的基础上，对区内地层的分布提出了新的见解，认为沙龙地区和北过龙至金龙河地区出露的一套浅变质火山－沉积岩石应划归来龙关群，并运用同位素年代学方法测定了该地层中火山岩的成岩时代，首次较确切地给出了这套浅变质岩系的时代归属，从而进一步确定了朱龙关群的时空分布。同时根据火山岩岩石化学特征研究，认为朱龙关群火山岩的成岩大地构造背景为陆内裂谷。     

福建浦城－三都澳和崇安－石城成矿带铅同位素特征及其地质意义

对浦城－三都澳和崇安－石城成矿带钢金锡多金属矿床及相关岩体的铅同位素特征作了系统研究和对比。结果表明，两成矿带不同成矿期以及同一成矿期不同区段间的铅同位素组成存在很大差异。并就此探讨了在成矿作用和岩浆作用动力学机制等地质问题中的意义。