论文部分内容阅读
为了小规模地(岩石成因问题)以及大规模地(地质力学问题)探索地球的化学演化过程,业已证明,放射成因同位素是极其有效的工具。近年来,利用钕同位素作为地质追踪剂的结果表明,多追踪剂技术比单一的追踪剂技术优越得多。Nd和sr同位素之间的负相关性与Pb—Sr同位素之间的非相关性不同,因而给地球的化学演化提示了一个最重要的问题。 这些研究结果清楚地表明,需要有更多的、具有不同特点的地质追踪剂,以便对地球演化方面的普遍性问题提供新的制约因素。这些制约因素就是锇同位素。~(187)Re通过β~-衰变为~(187)Os,其衰变常数约为1.6×10~(-11)年~(-1)。铼与锇都是亲铁-亲铜元素,因此有人认
In order to explore the chemical evolution of the Earth on a small scale (rock formation problems) and on a large scale (geomechanical issues), radiogenic isotopes have proven to be extremely effective tools. In recent years, the use of neodymium isotopes as a geological tracer has shown that the multi-tracer technology is much superior to a single tracer technology. The negative correlation between Nd and Sr isotopes is not the same as that of Pb-Sr isotopes, thus suggesting one of the most important issues for the Earth’s chemical evolution. These findings clearly demonstrate the need for more geological tracing agents with different characteristics in order to provide new constraints on the universality of the evolution of the Earth. These constraints are osmium isotopes. The decay constant of ~ (187) Re is ~ 1.6 × 10 ~ (-11) years -1 through β ~ - decay to ~ (187) Os. Both rhenium and osmium are pro-iron-pro-copper elements, so some people think