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1)  uranium isotope age
铀同位素年龄
2)  U Pb isotopic age
铀-铅同位素年龄
3)  isotope age
同位素年龄
1.
A series of the lava and the red strata up them in the west part of northern Dabie orogen were divided into Chenpeng Formation and Zhou Jiawang Formation,which belong to the early and late Cretaceous period,according to the conchostracans,the isotope age and the fossils of abundant dinosaur eggs and a few ostracodas.
大别造山带北缘西部的一套火山岩及其上的“红层”,依据叶肢介、同位素年龄值和较丰富的恐龙蛋和少量介形虫化石,从下而上划分为陈棚组、周家湾组,时代归属早、晚白垩世。
2.
Isotope age determination results show that the age of formation is 138 Ma for the 3-d member of the Zhangjiakou group volcanic rocks and is 133 Ma for the Huajiying group rocks.
根据同位素年龄测定,冀北地区张家口组三段酸性火山岩的形成年龄为138Ma,属于上侏罗统顶部;花吉营组中基性岩石的形成年龄为133Ma,应划归下白垩统底部为宜。
4)  isotopic age
同位素年龄
1.
The rocks and isotopic age of collisional structures in Pamir Plateau recorded the movement of Indian plate towards Asian plate, which passed through 3 stages of subduction, collision and squeezing.
帕米尔地区碰撞构造的岩石与同位素年龄,记录了印度板块对亚洲板块的运动,经历了俯冲、碰撞和榨挤3 个阶段。
2.
Large amount of isotopic age data achieved in recent 10 years in Hengshan & Wutai Mt.
近10年在恒山和五台地区所获得的大量同位素年代学资料,统计发现恒山杂岩的同位素年龄峰值比五台杂岩大致要年轻20Ma,这与恒山-五台地区为岛弧根带-岛弧关系的推论相符合。
3.
Rock and isotopic age of the collision structures in Pamir region have recorded the movement of Indian plate toward Asian plate, which has experienced subduction and consumption of Neo-Thetys (113±1.
帕米尔地区碰撞构造的岩石与同位素年龄记录了印度板块对亚洲板块的运动,经历了新特提斯洋俯冲消减(113±1。
5)  Isotopic ages
同位素年龄
6)  Re-Os isotopic age
铼-锇同位素年龄
1.
Re-Os isotopic ages of Tangjiaping molybdenum deposit in Shangcheng County,Henan and their geological significance;
河南商城县汤家坪钼矿辉钼矿铼-锇同位素年龄及地质意义
2.
Re-Os isotopic age dating of molybdenite separates from Elegen porphyry Mo (Cu) mineralized area, northwestern Alxa, western Inner Mongolia;
内蒙古额勒根斑岩型钼(铜)矿化区辉钼矿铼-锇同位素年龄及地质意义
补充资料:铀同位素
分子式:
CAS号:

性质:已发现质量数在226和242之间的16个铀同位素。其中238U,235U和234U是天然放射性同位素,其相对丰度(原子百分数)分别为99.275%,0.720%和0.005%。235U是惟一天然存在的易裂变核素,是重要的初级核燃料,可在慢中子作用下发生裂变放出大量能量。238U吸收一个中子后,经两次β衰变生成234pu,239pu为慢中子引发裂变,故238U是重要的次级核燃料。234U是238U的衰变子体,无实际意义。233U是232Th俘获中子后随之进行两次日衰变生成的人造易裂变核素。232U是232Th和233U的快中子反应生成的,由钍制造的233U中含有少量232U,后者的子体发出硬γ射线,使得233U核燃料比较难于处理。

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