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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。
- It intruded in Upper Ordovician Shifeng Formation and is dated as 333 86Ma of U Pb concordant age of zircon, which belongs to middle stage of Variscan. 岩体侵入上奥陶统石缝组（O3s） ， 岩体的锆石U?Pb 一致线年龄333－86 Ma， 属华力西中期。
- U - Pb dating U-Pb年龄
- U - Pb dating of zircon 锆石U-Pb定年
- zircon SHRIMP U - Pb dating 锆石SHRIMP
- LA - ICP - MS U - Pb dating LA-ICP-MSU-Pb定年
- ZIRCON U Pb AGE OF META BASIC LAVA FROM THE KUANPING ROCK GROUP,SHAANXI PROVICE 陕西宽坪岩群变基性熔岩锆石U-Pb年龄
- Nothing could b u further from the tr Dating uth! 这完全与事实真相!
- Chemical Th-U-total Pb isochron dating is a new method to calculate the geological ages based on EMPA dada of U, Th and Pb. 化学定年方法是利用电子探针分析副矿物中的U、Th、Pb含量而进行定年的一种新方法。
- They've been dating for a long time. 他们一直频频约会。
- They haven't set a date for their wedding yet. 他们的婚期还没定下来。
- This Greek dish is of a very early date. 这个希腊盘子是很早时期的制品。
- ~(14)C, ~(137)Cs and ~(210)Pb dating and accelerated tendency of the present sedimentation rate along the Laolangtuozi coast of the Bohai Bay 渤海湾老狼坨子海岸带~(14)C、~(137)Cs、~(210)Pb测年与现代沉积速率的加速趋势
- I tried to fix the date in my mind. 我试着把那个日期牢记在心。
- Can you produce any proof of your date of birth? 你能出示有关你的生日日期的任何证件吗？
- All our information is up to date on the computer. 我们计算机上的信息都是最新的。
- It is no good asking her for a date. 要求和她定个约会也没有用。
- He can reel off the date of the king of england. 他能流畅地说出所有英国国王的生卒年份。
- The dresses on show are out of date. 展出的服装都过时了。
- Let's discuss the delivery date first. 我们先讨论交货日期。
