壳型花岗岩具较高的铅同位素比值和富铀铅贫钍铅的特点；
The crust granites have higher lead isotope ratios and are richer in uranium lead but poorer in thorium lead.
地球不同圈层的稀有气体同位素具有不同的特征同位素比值。
Rare gases in different spheres of the earth have different characteristic isotopic ratios.
证据就存在于海洋泥土，花粉化石和记录温度变化的化学同位素比值变化之中。
The evidence lies in ocean mud, in fossil pollen, and in changes in ratio of chemical isotopes that record shifts in temperature.
结合低本底化学流程，实现了微量地质样品的高精度同位素比值测试。
Combining chemical separation procedures having low blank, measurements of micro-geological samples have successively been achieved.
使用同位素比值法有着一个明显的局限因素，就是要用质谱仪进行分析。
An obvious restraint in the use of isotope ratios results from the need to employ mass spectrometers.
环境样品的硫同位素比值能够提供硫的来源及其在环境中扩散迁移的相关信息。
Sulfur isotope ratio of environmental sample can provide detail information regard to origin and transport of sulfur in the environment.
宇宙化学是研究发现的化学品的太阳能系统，包括起源的要素和不同的同位素比值。
Cosmochemistry is the study of the chemicals found within the Solar System, including the origins of the elements and variations in the isotope ratios.
具体结论如下：石墨发射剂的量和涂样顺序对硼同位素比值的测定有一定的影响。
The results showed as the following: The content of graphite as loading agent and the sequence of loading graphite and the sample to the filament affect the boron isotopic ratios.
不过，变质岩中微量碳酸盐的碳含量和碳同位素比值分析能够对原岩类型提供有效的判别。
Nevertheless, the combined carbon content and isotope analyses of micro-carbonate in metamorphic rocks can be used to make a distinction in origin between sedimentary and igneous protoliths.
近年来，随着检测灵敏度和分辨率的提高，该技术在放射性核素含量和同位素比值测定中的应用日益突出。
In recent years, with the improvement of sensitivity and resolution, its application was increasing to determine radionuclides content and isotope ratios.
旧的GCIRMS单体碳同位素比值色谱质谱仪离子源高压放电故障频频发生，以致仪器不能正常工作。
The old GC IR MS didn't operate continuously because its fault of ion source high voltage discharge took place frequently.
气体采样中的氪和氙同位素比值产生了一个令人吃惊的结果：这些比值跟在形成太阳系的原始云团中所发现的比值不一致。
The krypton and xenon isotope ratios in the gas samples provided a surprising result: They did not match the ratios found in the primordial cloud that spawned the solar system.
采用一系列温和的化学降解法对松辽盆地南部嫩江组烃源岩的干酪根进行连续的选择性化学降解，并对不同降解产物进行色谱—同位素比值质谱分析。
A sequential selective chemical degradation was performed for the kerogen from the Nenjiang Formation of the southern Songliao Basin by using a series of mild chemical degradations.
根据甲烷碳同位素法和烃类比值法分析判断该区地表烃类异常主要由深部油气活动所产生。
The surface hydrocarbon anomalies in the area was caused by oil and gas activities in deep part, according to the analysis and judgement using the carbon isotope and hydrocarbon ratio.
本研究共采集岩心样品1003个，发现介形类化石557个，鉴定出15个化石组合带，测得252组碳氧同位素和189组微量元素比值数据。
In this study, 1003 core samples were collected, found 557 fossils of ostracods, identified the 15 fossil assemblage, the measured carbon and oxygen isotopes 252, and 189 trace element ratio data.
另外碳氮同位素及其比值在当前的河流有机质生物地球化学研究中仍起着非常重要的示踪作用。
In addition, carbon and nitrogen isotope and its ratio was important indicator in the riverine biogeochemistry study.
硫、铅同位素和锇同位素初始比值显示，成矿物质主要来自含矿侵入岩体，但是也有其它来源。
Sulfur and lead isotopic features and initial OS values suggest that the ore-forming materials were mainly derived from the host quartz diorite and granodiorite.
硫、铅同位素和锇同位素初始比值显示，成矿物质主要来自含矿侵入岩体，但是也有其它来源。
Sulfur and lead isotopic features and initial OS values suggest that the ore-forming materials were mainly derived from the host quartz diorite and granodiorite.
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