查询词典 isotope

In the past several decades,great achievements have been made by the marine foraminiferal boron isotope researches on the following aspects:analytical techniques,offsets between laboratories,isotopic fractionation factor,long-term changes in.

海洋浮游有孔虫中的硼同位素能够反映海水酸碱度的变化，从而为重建大气二氧化碳浓度的变化提供了一种新的手段，有望提供目前极地冰心记录所无法企及的百万年甚至千万年时间尺度上的大气二氧化碳浓度的变化。

Based on the high-resolution analysis of planktonic foraminiferal isotope and organic carbon of 91 sediment samples from two box cores located respectively in the southern and northern slopes of the South China Sea, the changes of sea surface temperature and paleoproductiviy of the past 2400 years were reconstructed. The sea surface temperature and the depth of thermocline varied in different stages during the late Holocene, with some short-term climate events such as the Little Ice Age.

对南海南、北陆坡两个箱式柱状样中91个沉积物样品进行了高分辨率的稳定同位素和有机碳分析，获得最近2400年以来上部海水温度和表层古生产力的记录，发现晚全新世南海的表层海水温度和温跃层呈现阶段性变化，且有小冰期等短期气候事件。

In the past several decades, great achievements have been made by the marine foraminiferal boron isotope researches on the following aspects: analytical techniques, offsets between laboratories, isotopic fractionation factor, long-term changes in seawater boron isotopic compositions and vital effects.

最近，海洋浮游有孔虫硼同位素的研究在实验分析技术、实验室偏差、同位素分馏系数、海水硼同位素长期变化以及各种次要因素等方面都取得了长足的进步，尤其是全蒸发负热电离质谱法的建立使硼同位素分析的样品需求量降到纳克级以下。

This paper reviews the methods and recent progress in cold seep benthic foraminiferal studies in some modern active cold seeps. Through comparison the main characteristics of modern cold seep benthic foraminiferal faunal and the discrepancy between different seepages are presented. It also reviews the carbon isotope response of benthic foraminifera in different cold seep areas and its possibly influential factors. Finally we give a general outlook for the study of cold seep benthic foraminifera in the northern South China Sea.

综述了全球一些主要冷泉区的底栖有孔虫研究方法及其进展，对比了各冷泉区底栖有孔虫群落结构的主要特征及地域差异，评述了冷泉区底栖有孔虫的碳同位素记录特征、影响因素及其对冷泉活动的潜在指示意义，最后提出了南海北部冷泉活动区底栖有孔虫方面的研究展望。

The results based on the gas, carbon isotope and water chemistry geothermometer suggest that the temperature of the deep reservoir is about 250±7℃, while the temperature ranges of the median and shallow reservoirs are 241~190℃ and 195~154℃ respectively....

气体、同位素、水化学地球化学温标显示，深层热储的温度约为 2 5 0± 7℃、中、浅层地热储温度的变化范围分别为 2 41～ 190℃和 195～ 15 4℃。根据岩浆来源 CO2 和 CH4之间的碳同位素分馏值计算，目前该区深部岩浆热源的温度应高于 5 14℃。

Geothermal fluid ; Magma hot source ; Isotope ; Geothermometer

地热流体；岩浆热源；同位素；地质温度计

Associated minerals are primary glauberite, halite and terrigenous mud; while calcite is absent or rare. The X-ray diffraction analysis shows that the mud-sized crystalline dolostone has an average CaCO3 mole content of 57.30% and an average degree of order of 0.40, revealing the characteristics of higher calcium content and lower degree of order. It is closely intergrown with glauberite, indicating that the aqueous medium in the depositional environment of mud-sized crystallinedolostone was hypersaline water or dilute brine. The temperature of water in the depositional environment calculated according to the oxygen isotope data averaged 30.5℃ and the minimum homogenization temperature of inclusions in primary glauberite crystals associated with mud-sized crystalline dolomite was 44℃. The two groups of temperature data are close, indicating that the temperature of the water in the paleolake environment during the deposition of mud-sized crystalline dolostone ranged from 30.5℃ to 44℃.

泥晶白云石在阴极发光下呈红色、橙红色，与其伴生的矿物除原生钙芒硝、石盐、陆源泥质外，方解石没有或极少；X衍射分析结果表明，泥晶白云石的CaCO3摩尔含量平均为57.30%，有序度平均为0.40，具高富钙、低有序的特征；与钙芒硝岩的紧密共生，说明泥晶白云岩沉积环境的水介质为高盐度的咸水或淡卤水；根据氧同位素数据计算的沉积环境的水体温度平均为30.5℃，与泥晶白云石伴生的原生钙芒硝晶体中的包裹体均－温度最低值为44℃，这两组温度数据基本接近，表明泥晶白云石沉淀时环境水体的温度大致在30.5-44℃之间。

So the meta-granitoids can he recognized and separated from the metamorphic sequences. They are grouped as the Meoproterozoic-Neoproterozoic gneissoid granite-monzogranite-granodiorite, with their isotope ages of 953.4 Ma to 1450 Ma, and the Sinian schistostose quartz monzogranite diorite.

主要成岩期及代表性岩类有：晚元古代为片麻状正长花岗岩－二长花岗岩－花岗闪长岩，同位素年龄为953.4~1450Ma；震旦纪为片理化石英二长岩－石英闪长岩，同位素年龄为547Ma。

The stable carbon isotope values of α-,β-,and γ-hexachlorocyclohexane isomers were determined by GC-C-IRMS,EA-IRMS,and Dual-inlet IRMS in this study.

应用GC-C-IRMS技术分析了水样品中α-和γ-六六六的碳同位素组成，结果表明六六六在溶解、稀释、萃取、挥发等过程碳同位素组成没有分馏现象。

In this study, bound residues of [C ring-U-14 C] ZJ0273 in three kinds of soil and dynamics distribution in humus fulvic acid, humin and humic acid were studied by using 14C isotope tracer technique.

利用14C同位素示踪技术研究了［C环－U-14C］丙酯草醚(ZJ0273)在3种不同类型好氧土壤中的结合残留及其在富啡酸、胡敏酸和胡敏素中的动态分布。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。