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1970年,W.E.叶谢诺夫等人提出可用 Os/Re 比值求地质年龄的方法以后,采用者不断增多。近几年,我们采用此法,对陕西小秦岭地区几个钼矿床进行了数十个同位素地质年龄计算。鉴于 W.E.叶谢诺夫等人对该法使用未作详细介绍,对干扰因素未曾探讨,本文就此引伸,以利推广使用。一、计算原理、方法及其讨论(一)计算原理现有资料表明,锇有七种稳定同位素,其中 Os~(187)可为放射性成因,聚集在含铼(辉钼矿)矿石中,由 Re~(187)发生β衰变形成。铼仅有 Re~(185)和 Re~(187)两种同位素,它们在天然混合
In 1970, W.E. Scheerenov et al. Proposed that the method of using the Os / Re ratio for geo-age could increase the number of adopters. In recent years, we use this method to dozens of isotopic geological age calculations for several molybdenum deposits in the Xiaoqinling area of Shaanxi Province. In view of the W.E. Ye Xie Xie Nuofu et al on the use of the law is not described in detail, did not discuss the interference factors, this article on this extension, to promote the use of. I. CALCULATIONS, METHODS AND DISCUSSION A. Principle of calculation The available data indicate that there are seven stable isotopes of osmium, of which Os ~ (187) can be radiogenic and accumulate in ores containing rhenium (molybdenite) from Re ~ (187) β decay occurs. Rhenium only Re ~ (185) and Re ~ (187) two isotopes, they are naturally mixed