The trick they used to do this was to look at the isotopic composition of the oxygen in the wood of local trees.
他们所使用的办法是观测当地树木的木材中的氧同位素组成（isotopic composition）。
Such a study provides a basis for understanding palaeoclimate shifts by investigation of organic carbon isotopic composition in the deep sea sediments.
从而为利用深海沉积有机质碳同位素组成研究古气候变迁提供了依据。
Now, by examining the isotopic composition of that water, researchers have found that it matches that of meteorites, the likes of which also delivered Earth its first drink.
现在，通过检查水的同位素构成，研究人员发现这与第一次给地球带来水的陨石相吻合。
The isotopic composition of lead, sulphur and carbon demonstrate a complex source of ore forming material.
用硫、碳和铅同位素组成说明成矿物质的复杂来源。
The organic carbon isotopic composition of sediments has been widely used to reconstruct paleoenvironment.
沉积物中的有机质稳定碳同位素已经广泛应用于重建古环境。
The result reveals that there is positive relationship between boron content and boron isotopic composition.
硼含量和硼同位素组成有正相关关系。
The Pb isotopic composition of the ore is similar to that of Mesozoic_Cenozoic sedimentary rocks in this basin.
矿石与盆地的中新生界沉积岩系的铅同位素组成相似。
The isotopic composition of solar system is the base for studying the origin and evolution of the solar system.
太阳系原始同位素组成是研究太阳系起源和演化的基础。
The ideal choice, when isotopic composition is used to investigate the source of copper ore, would seem to be copper itself.
当同位素构成被用来研究铜矿石的来源时，理想的选择似乎是铜本身。
The influence of the monsoon climate on the isotopic composition of precipitation is discussed based on the accumulated data in China.
根据我国积累的雨水同位素组成资料，讨论了季风气候对雨水同位素组成的影响。
Triassic is a period with a great change in global environment, so it is more difficult to study its strontium isotopic composition of seawater.
三叠纪是地球环境的重大变革时期，海水锶同位素组成的研究也较为困难。
The lead isotopic composition of the Devonian stratabound ore deposits in the Nanling region is highly variable and belongs mostly to the "mixing type".
我国南岭地区泥盆系层控矿床的铅同位素组成变化很大，大多属混合型铅。
It is generally accepted that the carbon isotopic composition of plant material is correlated with C3 and C4 pathways of carbon fixation in photosynthesis.
一般认为，任何植物体的碳同位素组成主要与光合作用的C3和C4两种碳固定途径有关。
The Giant Impact Theory explains many aspects of lunar geology including the size of the Moon'score and the density and isotopic composition of moon rocks.
大碰撞假说能够解释月质学的许多方面内容，包括月球核心的大小、密度、月岩的同位素组分等。
The major factors that influence isotopic composition of cave drip water are mean annual air temperature, mean annual rainfall and change in moisture source.
影响洞内滴水的稳定同位素组成的因素主要是年平均气温、年降雨量以及降水气团的来源的变化。
Surface soil samples were collected in the deserts and Gobi regions of China. The carbonate content and carbon and oxygen isotopic composition were analyzed.
在中国的主要沙漠和戈壁等粉尘源区采集了地表沙或土壤（统称为表土）样品，分析了样品的碳酸盐含量和碳酸盐的碳氧同位素组成。
The hydrogen and oxygen stable isotopic composition and dissolved gas components of the hot spring (well) water in the southern area of Zhangjiakou are studied.
本文研究了张家口南部地区温泉（井）水的氢氧稳定同位素组成及溶解气体组分特征。
The paper deals with the ore-forming material sources on basis of study on S, Pb, H, O, C and rare gas isotopic composition, fluid inclusion and comparative analysis.
通过对峪耳崖金矿硫、铅、氢、氧、碳、稀有气体同位素、包裹体研究以及与区域对比分析，对金、银成矿物质来源进行探讨。
Sulfur isotopic composition of sulfide in different formations was related to their source, and tended to be uniform with the growing stacked reworking at later stages.
不同建造中硫化物的硫同位素组成与其来源有关，并随后期叠加改造作用的增强而趋于均一。
This paper sets up a curve of the strontium isotopic composition of the Late Paleozoic based on 92 unaltered marine carbonate samples collected from Sichuan and Guizhou.
根据川黔地区海相上古生界未经蚀变的92个样品的锶同位素测试数据，建立了该地区晚古生代锶同位素组成曲线。
It is indicated that the sulfur isotopic composition of precipitation of Xiang-Gui Corridor is enriched in 32S, however, which of the Pearl River Delta is enriched in 34S.
湘桂走廊地区大气降水明显的富集轻硫同位素（32S），而珠江三角洲地区则富集重硫同位素（34S）。
The isotopic composition of oxygen shows that the origin of the ore forming solution was turn from magmatic water in early stage to circulated meteoric water in later stage.
通过氧同位素研究证明了成矿溶液的来源由早期岩浆水转变为晚期大气降水；
Hydrogen and oxygen isotopic composition of the fluid inclusion in quartz indicates that the water in ore-forming fluid was derived meanly from mixture water of meteoric and magmatic.
石英流体包裹体氢氧同位素组成表明，成矿流体中的水主要来源于大气降水和岩浆水的混合。
Based on the carbon and oxygen isotopic composition and rare earth element (REE) patterns, the origin of the Dabaoshan deposit is considered to be related to the sea-floor thermal events.
根据含矿层序中的碳、氧同位素组成和稀土元素(REE)模式，认为大宝山矿床是海底热事件的结果。
The major compositions of amphibole in the granites, trace element composition and isotopic composition of granites were effective index to distinguish different metallogenic granitic bodies.
角闪石的化学成分及不同成矿岩体的微量元素和同位素特征是区分区内两类不同成矿岩体的有效判别标志。
Studies of the C and H isotopic composition of natural gases of continental origin will provide valuable information on the prospecting and development of natural gases of different genetic types.
通过对我国陆相成因天然气碳、氢同位素研究，探讨其同位素组成特征及其意义，从而为各种成因类型天然气的勘探开发提供了有益的信息。
The Pb isotopic composition of ore sulfides is stable and the ore lead is ordinary common lead. Ore lead derived from magma, which came from partial melting of the upper crust in Early Cretaceous.
矿石铅同位素组成稳定，为正常普通铅，矿石铅来源于早白垩世上地壳物质部分熔融形成的岩浆。
In addition, the hydrogen isotopic composition of the hydrocarbon gas generated during hydrous experiment is obvious lighter, especially for that of ethane, compared with that of anhydrous experiment.
与无水实验相比，加水实验所生烃气氢同位素组成明显较轻，并以乙烷最为显著。
In addition, the hydrogen isotopic composition of the hydrocarbon gas generated during hydrous experiment is obvious lighter, especially for that of ethane, compared with that of anhydrous experiment.
与无水实验相比，加水实验所生烃气氢同位素组成明显较轻，并以乙烷最为显著。
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