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dating precision
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  测年精度
     The dating precision low of the present Quaternary chronological scale will progressively be replaced on the basis of macroscopic and microscopic deposit characteristics and systematic dating ages from stalagmites in caves.
     这些1.2~4 m高的巨型石笋,沉积旋回、纹(微)层、层面构造等特征,都很有典型性和代表性。 根据石笋的宏观、微观沉积特征和系统测年,拟逐步取代测年精度不高的现行第四纪地质年表。
短句来源
     It is very important to select methods for baddeleyite U-Pb dating according to the mineral content, grain size, age range, U-Pb content and dating precision requirement of the samples to get relatively ideal results.
     在实际工作中,根据从具体样品中分选得到的斜锆石的数量、粒度大小、年龄范围、U-Pb含量、测年精度要求等因素,灵活地选择测年方法,对于获得比较理想的测年结果是非常重要的。
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  相似匹配句对
     the precision (c. v. )
     精密度(C.V.)
短句来源
     The Radiocarbon Dating Technology of High Precision
     高精度 ~(14)C 测年技术
短句来源
     Optical dating
     激光断代
短句来源
     Passion for Precision
     精密度的追求
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     Dating for Children
     子女相亲,父母代劳(英文)
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  dating precision
7100 and 5040 b.c., dating precision with 95% probability: ±7 years).
      
For most of the samples we could provide dendrochronological dates (1-year dating precision, back to 5125 b.c.) or wiggle matched dates (between approx.
      


The Quaternary plays an important role in the geological history because it is closely related to the human beings.Therefore highly reliable and precise Quaternary dating is needed.Now geologists have improved and developed many Quaternary dating methods.This paper discusses some recent advances in the Quaternary dating in respect to rock stratigraphy,biology,magnetic stratigraphy,archaeology and isotope dating.The main progress of these methods is as follows: the dating precision and efficiency have bean...

The Quaternary plays an important role in the geological history because it is closely related to the human beings.Therefore highly reliable and precise Quaternary dating is needed.Now geologists have improved and developed many Quaternary dating methods.This paper discusses some recent advances in the Quaternary dating in respect to rock stratigraphy,biology,magnetic stratigraphy,archaeology and isotope dating.The main progress of these methods is as follows: the dating precision and efficiency have bean raised markedly while the required dosage of a dated sample is reduced significantly because of the development of technologies,such as the Ar-Ar laser microprobe dating;and these dating methods can be used in wider research fields. For example,the ESR method has used in dating of tills and the sequences established according to the dating results may correlate with the deep sea oxygen isotope stages. However,it is necessary to have plenty of geological experience,choose appropriate dating methods according to the features of the samples and use as many appropriate methods as possible for comparative dating to improve the reliability of dating.

第四纪与人类的关系及其在地质历史中的重要位置,需要高精度高分辨率的测年。第四纪地质学家们改进、发展了许多第四纪的测年方法。文章主要从岩石地层法、生物法、磁性地层法、考古法、放射性定年法等方面讨论了近年第四纪测年的一些研究进展。目前,这些方法的主要进展表现在由于科学技术的提高,如激光显微探测技术等,使得测年的精度、功效显著提高而样品的用量却有了显著的降低,并且拓展了一些测年的应用领域,如电子自旋法应用于冰碛物的测年,其据测年结果建立的序列可与深海氧同位素阶段对比。但要使得测年的可靠性增强,则需要有丰富的地质工作经验,根据所测样品的特征选择恰当的测年方法,且要尽量选择多种适当方法进行对比测年。

The vertical distribution of ~(137)Cs in sediment profiles is present in accordance with the record of ~(137)Cs fallout variations in the atmosphere. Therefore,~(137)Cs can be used to infer a geochronology for sediment profiles and sediment accumulation rates can be estimated by measuring vertical distribution of ~(137)Cs in sediment profiles. But some factors must be taken into account for dating horizon in sediment profiles more accurate and precise. The time lag between the time of atmospheric deposition...

The vertical distribution of ~(137)Cs in sediment profiles is present in accordance with the record of ~(137)Cs fallout variations in the atmosphere. Therefore,~(137)Cs can be used to infer a geochronology for sediment profiles and sediment accumulation rates can be estimated by measuring vertical distribution of ~(137)Cs in sediment profiles. But some factors must be taken into account for dating horizon in sediment profiles more accurate and precise. The time lag between the time of atmospheric deposition of ~(137)Cs and the time of deposition of ~(137)Cs to sediment profiles should be calculated. For some sediment profiles ~(137)Cs concentration per unit of clay should be explained. In order to prove the accurate of ~(137)Cs dating, sediment accumulation rates estimated by ~(137)Cs dating should also be compared with that measured at same site by other methods, such as standard sediment survey method, ~(210)Pb dating, sedimentary lamination, pollen and so on. Then with several depositional horizons marked by ~(137)Cs the depth (cm) or the mass (g/cm~(2)) of sediment for different time periods can be calculated. And it can be made to compare sediment accumulation rate in depth (sediment accumulation rate) and in mass (sediment flux) for different time periods. Because of compaction effect on sediment the sediment flux can well and truly reflect sedimentation rate. Based on the sediment flux and the area of lake bed measured by GIS, the annual gross accumulation of sediment can be calculated and internal load of pollutants in the lake sediment, lake evolution and environment changes of the lake basin can be studied further. Therefore, ~(137)Cs dating has been extensively used for evaluation of sediment accumulation rate of lake, estuary, and ocean. However, there are still some problems under resolve. Firstly, how thickness of sampling should be divided up to meet both the needs of ~(137)Cs dating precision and the propriety of measurement work. Secondly, attention should be paid to the lag time between ~(137)Cs deposition in atmosphere and in sediment relates to the transport time from soil loss in field to lake. Thirdly, it should be also carefully taken into account whether diffusion and infiltration movement of ~(137)Cs in sediment profiles occurred and what their mechanisms are.

137Cs计年法利用137Cs固有的理化和沉降特性,在湖泊沉积物的137Cs垂直分布与大气137Cs沉降间确立对应关系,找出有异常137Cs含量的沉积层作为时标,但需注意137Cs从水体表面至湖底的时间和粘粒含量对各层137Cs含量的影响,并用其它方法校验时标的可靠性。再求取不同时标层间的年均沉积厚度,或因克服了压实效应而更能反映真实沉积速率的年均沉积通量,且结合GIS等手段进一步估算湖泊各区域的沉积总量;还可延伸研究湖泊内源污染负荷及相关环境演变和湖泊演化。但是,沉积柱样的分割厚度取多少才能既满足计年精度要求又不使工作量过大,137Cs的大气沉降时间与进入沉积物时间还与泥沙的陆地迁移时间有关,沉积物中究竟是否发生137Cs下渗及其机理等都还是此法应用中有待解决的问题。

The luminescence dating is one of important research methods used in the study of geology and archeology.It has been made a rapid development in the last ten years,which mainly include:(1) the rapid progresses in the technical equipments,such as stimulating light source,bleaching light source,radiation source and operating software,etc..As a result,the dating precision of the technical equipment has been improved and the systematic error has been decreased largely;(2) the rapid progress in the dating...

The luminescence dating is one of important research methods used in the study of geology and archeology.It has been made a rapid development in the last ten years,which mainly include:(1) the rapid progresses in the technical equipments,such as stimulating light source,bleaching light source,radiation source and operating software,etc..As a result,the dating precision of the technical equipment has been improved and the systematic error has been decreased largely;(2) the rapid progress in the dating method.As the developmental symbol of luminescence dating method,the single aliquot regenerative dose protocol and the linear modulation technique has been developed quickly in the last ten years,which turned out that the measurement of equal dose becomes more accuracy and its process is more simple and easily to operate;(3) the diversification of the materials for luminescence dating.It not only includes the heated materials(such as the fragment of ceramic and tile) and the complete optical exposure materials,but also includes the other heated materials(such as fault clay) and the incomplete optical exposure materials,which expands the application field of the luminescence dating;(4) the mutual complementation of the measurement methods for annual dose,which reduces the uncertainty in the measurement of the annual dose.

根据释光测年是地质学研究和考古学研究领域重要的研究手段和断代方法,总结出了在近十多年来应用该方法在以下几个方面所取得的成果及进展:(1)主要包括激发光源、晒退光源、辐射源以及操作软件等技术设备方面的巨大进展,以及由于释光测年技术设备精度的提高而由此极大地降低了释光测年的系统误差;(2)以单片再生测年技术和线性调整技术为代表的多种测年方法的快速发展,使得不同类型样品等效剂量的测定更加准确,而且测年流程更加简单易于操作;(3)测年材料不仅包括经受热过(主要是陶瓦)和经充足曝光的物质,同时对未经充足曝光的物质(如水积物和崩积物等)和其他经受热过的物质(如断层泥等)等也进行了大量的测年研究,从而极大地拓展了释光测年的应用领域;(4)各种年剂量测定方法的相互补充降低了在年剂量测定方面的不确定性.

 
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