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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
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。
The U-Pb Isotopic Dating Age of Single Zircon from Biotite Plagioclase Gneiss in the Qinggele Area, Alashan, Western Inner Mongolia 内蒙古阿拉善庆格勒图黑云斜长片麻岩的单颗粒锆石U-Pb法年龄
U-Pb age of single zircon 单颗粒锆石U-Pb法年龄
single zircon U - Pb ages 颗粒锆石U-Pb年龄
~(207)Pb/~(206)Pb Age of Zircon and ~(40)Ar/~(39)Ar of Amphibole from Plagioclase Amphibolite in the Taihua Group, Luoning,Henan,China 河南洛宁太华岩群斜长角闪岩的锆石~(207)Pb/~(206)Pb和角闪石~(40)Ar/~(39)Ar年龄
DIRECT DETERMINATION OF THE ~(207)Pb/~(206)Pb AGE OF SINGLEGRAIN ZIRCON BY USE OF THE THERMAL EMISSION MASS SPECTROMETER 用热离子发射质谱计直接测定单颗粒锆石~(207)Pb/~(206)Pb年龄
The average age of the boys in this class is fifteen. 本班男生的平均年龄是十五岁。
I don't think he looks his age of seventy. 我感到他看起来不像70岁的人。
Li Huimin, Li Huaikun, Lu Songnian.Ore forming age of the Dongping gold ore: The U - Pb zircon dating of the hydrothermal zircon in the ore vein[J].Journal of Earth, 1997, 18(Sup. ) : 176 - 178. [6]李惠民;李怀坤;陆松年.;用矿脉中热液锆石的U-Pb定年确定东坪金矿的成矿时代[J]地球学报;1997;18(增刊):176-178
Uranium-Lead Age Determination of Single Zircon Grain by Laser Ablation Microprobe-Inductively Couple Plasma Mass Spectrometry 激光探针等离子体质谱测定单颗粒锆石铀-铅年龄
The age of majority is eighteen. 成年的法定年龄是18岁。
He ran away from home at the age of thirteen. 他十三岁那年就离家出走了。
At the age of thirty, Mary began to lose colour. 玛丽在30岁的年纪就红颜渐逝了。
She was orphaned at the age of ten. 她在十岁时成为孤儿。
My father retired at the age of 60. 我父亲六十岁时退休了。
My grandmother got married at the age of seventeen. 我的祖母十七岁就结婚了。
He is living in a state of single blessedness. 他过着独身生活。
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。
He was already balding at the age of 25. 他25岁就秃顶了。