1)isotopic geochronology同位素年代学
1.Study on Sm-Nd and Rb-Sr isotopic geochronology indicates the nappe structure was formed during Caledonian[(426.Sm-Nd及 Rb-Sr同位素年代学研究表明 ,早期逆冲推覆作用发生在加里东期 [( 4 2 6± 15 ) Ma] ,晚期层内伸展剪切及热液成矿作用发生在燕山早期 [( 15 2± 3 ) Ma]。
2.The study of isotopic geochronology shows that the ages of the Houhe Groups and Xixiang Group which constitute the metamorphic basement of the northern margin of the Yangtze Craton,are much older than those previously suggested.多种同位素年代学方法综合研究表明，扬子克拉通北缘中段基底岩系后河群和西乡群变质地层的原岩形成时代并非早期推测或报道的新元古代。
3.Based on the data of biostratigraphy, isotopic geochronology, magnetostratigraphy, the author has studied the upper and basal limits of Cretaceous in Zhejiang province and pointed out that the Tongxiang formation deve developed in Tongxiang Sag is the highest horizon of Cretaceous in Zhejiang province, it can be correlated with Taizhor formation in Jiangsu province.本文综合应用生物地层学，同位素年代学、磁性地层学方面的资料，论述了浙江白垩系顶、底界的位置。
英文短句/例句
1.THE EFFECT OF BACKGROUND POLLUTION ON AGE DATA IN ISOTOPE CHRONOLOGY同位素年代学中本底污染对年龄数据的影响
2.GEOCHRONOLOGICAL STUDY OF ARCHAEAN GRANITE-GNEISSES IN ANSHAN AREA, NORTHEAST CHINA鞍山铁甲山地区花岗片麻岩同位素年代学研究
3.The Features and Geochronology of Alkali Metasomatic Rock in Southern Zhuguang Uranium Mineralization Area诸广南部铀矿区碱交代岩特征及同位素年代学研究
4.Studies on the Geochronology, Geochemistry of the High-Grade Gneiss of the Larsemann Hills and Its Adjacent Region, East Antarctica;南极拉斯曼丘陵及邻区高级片麻岩的地球化学、同位素年代学研究
5.Geochronology and Geochemistry of the Tiejiashan Granites and Supercrustal Rocks in the Anshan Area, Liaoning Province;辽宁鞍山铁架山花岗岩及表壳岩的同位素年代学和地球化学研究
6.Geochemical, geochronological features and tectonic significance of volcanic rocks of Zhucun Formation in Baxoi area, eastern Tibet, China藏东八宿地区朱村组火山岩地球化学、同位素年代学及其构造意义
7.Isotopic Chronological Restriction of Granulite Facies Metamorphism in Daqingshan Area, Inner Mongolia;内蒙古大青山地区麻粒岩系变质作用的同位素年代学制约
8.A LA-ICP-MS chronological study of basic volcanics in Baiyin orefield,Gansu,China甘肃白银矿田基性火山岩的LA-ICP-MS同位素年代学
9.Isotopic Geochronological Characteristics and Implications of the Nanxiaoyao Gold Deposit in Yishui沂水南小尧金矿同位素年代学特征及其地质意义
10.EARLY PRECAMBRIAN MANJINGGOU HIGHPRESSURE GRANULITE MELANGE BELT ON THE SOUTH EDGE OF THE HUAIAN COMPLEX, NORTH CHINA CRATON. GEOLOGICAL FEATURES, PETROLOGY AND ISOTOPIC GEOCHRONOLOGY怀安蔓菁沟早前寒武纪高压麻粒岩混杂岩带地质特征、岩石学和同位素年代学
11.The Geochronological Studies of Liuhe Diopside-syenite-porphyry of Heqing County in Dianxi, SW China and Its Geological Implications;滇西鹤庆县六合透辉石正长斑岩的同位素年代学研究及其构造意义
12.GEOCHRONOLOGICAL STUDY OF ARCHAEAN ROCKS IN ANSHAN, LIAONING PROVINCE鞍山地区太古代岩石同位素地质年代学研究
13.isotopic dating of marine sediment海洋沉积物同位素年代测定
14.DISCUSSION ON ISOTOPIC GEOCHRONOLOGY OF PRECAM BRIAN JIAMUSI BLOCK关于佳木斯地块前寒武纪同位素地质年代学问题的讨论
15.ISOTOPIC GEOCHRONOLOGICAL EVIDENCE FOR THE CALEDONIAN XIONGDIAN ECLOGITE IN THE WESTERN DABIE MOUNTAINS,CHINA大别山西部熊店加里东期榴辉岩——同位素地质年代学的证据
16.Mesozoic Tectonic Evolution of the Qiangtang Block: Insights from Geochronology, Geochemistry and Isotopes of Volcanic Rocks;羌塘地体中生代构造演化：来自火山岩年代学、地球化学及同位素的证据
17.The Hydrogeological Research about Isotope of Chinese Present Salt Lakes;中国现代盐湖同位素水文地质学研究
18.Discussion on Rational Usage of Isotopic Age Information from the Metamorphic Rocks in Northern Fujian对闽北变质岩同位素年代信息合理使用的探讨
相关短句/例句
geochronology[英][,d?i:?ukr?'n?l?d?i][美][,d?iokr?'nɑl?d??]同位素年代学
1.According to the results of U-Pb、Rb-Sr、K-Ar isotope geochronology,the rockforming and mineralizing order of the Zijingshan Copper-gold deposit can be primarily set up: 133±6～118±14 Ma, granite intrusion resulting in wide alternation and Cu、An mineralization ; 105 ±1～100±1 Ma, the sub-and volcanism with the main An mineralizing period.紫金山铜金矿同位素年代学及其地质意义周肃，陈好寿（宜昌地质矿产研究所，湖北宜昌４４３００３）（浙江大学地球科学系，杭州３１００２７）关键词铜金矿，同位素年代学，成岩成矿时序紫金山铜金矿床是我国近年来发现的首例石英－明矾石型浅成低温热液矿床［１］。
3)isotope chronology同位素年代学
1.A comparative study of the petrology,geochemistry and isotope chronology at the typical sections of the Yix ian Formation in the two areas indicates that the horizon con-taining bird fossils(the Jianshangou lay er)and the Yixian Formation below the horizon in the Sihetun area,Beipiao,may correlate with the Zhuanchengzi layer of the Yixian Formation and the horizon below the layer in th.两地区义县组典型剖面区的岩石学、地球化学和同位素年代学等方面的对比研究表明,北票四合屯地区含鸟珍稀化石层位——尖山沟层及以下层位的义县组与义县地区义县组砖城子层及以下层位可比,而与义县地区义县组的其他层位不可比。
4)Isotopic chronology同位素年代学
1.From isotopic chronology to tectonic chronology;从同位素年代学到构造年代学
2.In this paper, the authors will review the progresses of mylonite petrology in the past two decades based on studies of micro ultramicroscopic structure, solid state rheology, mineralization of dynamic metamorphism, modeling experiment of rock formation, tectono geochemistry, orogenic kinematics and isotopic chronology.从显微超微构造、岩石固态流变、动力变质成矿、成岩模拟实验、构造地球化学、造山带运动学和同位素年代学等七个方面 ,较全面地阐述了近 2 0年来糜棱岩岩石学的研究进展情况。
5)isochronology同位素年代学
1.This paper presents a brief introduction to the basic theory and experimental method of Os-Osisochronology.本文介绍了国际上90年代最新发展的Os-Os同位素年代学方法的基本原理、实验方法；讨论了棒特点、应用范围、应用前景、发展方向及需要解决的问题。
6)isotopic age同位素年代
延伸阅读
同位素地质年代学同位素地质年代学isotopicgeochronology 同位素地球化学的一个研究领域。它依据放射性同位素衰变定律进行精确的地质计时，为地球形成以来各主要演化阶段确定了科学时标。所测年龄通常以100万年（Ma）表示。同位素地质年代学是地质学、核物理学和放射化学相结合而成的。它的发展与电子计算机技术、超微超纯分析技术特别是质谱分析技术的高速发展有关。能自发地放射各种射线的同位素称放射性同位素。放射性同位素放射出a或β射线而发生核转变的过程称放射性衰变。在放射性衰变过程中放射性母体同位素（衰变前的）的原子数衰减到原子数目的一半所需的时间称半衰期，记作T1/2。它不随外界条件、元素所处状态或元素质量的变化而改变。半衰期短的只10-7秒，长的可达1018年。放射性同位素在单位时间内每个原子核的衰变几率称衰变常数（λ）。T1/2和λ是计年时的特征常数。放射性衰变定律，指任何放射性同位素随时间按负指数规律衰减。公式为N＝N0e-λt，N0表示时间t＝0时放射性同位素的初始原子数，N表示经过t时间后剩下未衰变母体原子数，经任何时间由母体衰变的子体(新同位素)原子数为D＝N0－N。并得出的测年公式。计时法有铀-钍-铅法、钾-氩法、碳-14法等直接测定法和裂变径迹法等间接测定法。
