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Minerals or altered minerals such as sericite, biotite and K feldspar in the altered wallrocks are selected to be objects of age determination, and the Ar Ar, K Ar, Rb Sr, U Pb isochron dating methods are adopted. 选用矿石或蚀变围岩中的绢云母、黑云母、钾长石等蚀变矿物作为测年对象 ,采用 Ar- Ar、 K- Ar法或 Rb- Sr等时线法测年在目前的技术条件下是经济可行的 ,关键是要保证被测矿物确为蚀变矿物并且纯度较高。用 U- Pb法测定矿脉中的水热锆石来确定成矿年龄 ,但如何区分继承锆石和水热锆石尚不成熟。
Dating of Sm Nd, Rb Sr isotopic systems and its dynamic singificance for the Proterozoic augen granite in Yunkai area. 云开元古宙眼球状花岗岩Sm-Nd和Rb-Sr同位素体系定年及其动力学意义
Isotopic ages of the cumulate xenoliths and their host dioritehave been systematically measured by means of whole rock Rb Sr isochron, K Ar and 40Ar 39Ar techniques and 8 ages are obtained. 分别用Rb Sr法、K Ar法和Ar Ar法 ,对堆晶岩捕虏体及其寄主岩全岩或单矿物进行了详细的同位素地质年代学研究 ,共获得各种年龄数据8件。
Rb Sr ISOCHRON AGE GROUPS OF ROCKS FROM THE EASTERN SECTOR OF NORTHERN HUAIYANG AND THEIR REGIONAL GEOLOGICAL SIGNIFICANCE 北淮阳东段几组铷锶等时线年龄及其区域地质意义
The Sm Nd,Rb Sr Isotopic Ages of the Archean Granites in Southern Jilin Province 吉林南部太古代花岗岩Sm-Nd,Rb-Sr同位素年龄测定
He prefers to assort with people of his own age. 他更喜欢与自己的同龄人交往。
Even the best quality rubber will perish with age. 就是最佳质量的橡胶也会因老化而腐烂。
He come to the fore as a physicist at an early age. 他在早年就成了杰出的物理学家。
The average age of the boys in this class is fifteen. 本班男生的平均年龄是十五岁。
Education should not be restricted to any one specific age group. 教育不应限制在任何特定的年龄组上。
It was difficult to tell his exact age. 很难判断他到底多大岁数。
The annular markings on a tree indicate its age. 树的环形纹理显示其年龄。
Age and wedlock we all desire and repent of. 成年与婚姻，均为我辈所欲，亦为我辈所悔。
Her widowhood condemns her to a lonely old age. 守寡使她不得不过着孤独的晚年生活。
I don't think he looks his age of seventy. 我感到他看起来不像70岁的人。
He has always assorted with men of his age. 他总是与和他年令相仿的人交往。
He's of an age when he ought to settle down. 他已经到了应该安顿下来的年龄了。
Age stole onward and benumbed me more and more. 年纪渐老使得我(反应)越来越迟钝。
The child is at an impressionable age. 这孩子正处于易受影响的年龄。
That paper has yellowed with age. 那张纸因年代久远而泛黄了。