铼-锇同位素体系定年研究综述

铼-锇(Re-Os)同位素体系以其特殊的地球化学性质为确定岩石的形成时间、演化过程及其地球动力学背景提供了重要参数。随着测试技术和超净化实验室的发展,Re-Os同位素的应用领域不断扩大,测试对象种类也随之扩展。然而,不同测试对象的Re-Os同位素赋存形式、活动特征及其体系封闭性有所差异。文章总结了以辉钼矿、普通硫化物、地幔橄榄岩包体、富有机质沉积岩以及灰岩作为Re-Os同位素体系定年对象的基本原理和研究进展,并对存在问题进行简要地评述,最后对其未来的发展方向作了展望,以期推动Re-Os同位素体系在地质科学中的研究和应用。

Review of Re-Os geochronology

The Re-Os isotopic system can provide unique insight in dating and evolution of rocks and parameters of regional geodynamic background as they are highly siderophile compared to other long-lived radiaogenic isotopic systems.With the advances in both chemical separation procedures and chemical clean room,the Re-Os isotopic system is applied to a wider field.However,study suggests that occurrence,active characteristics and closure temperature of Re-Os system are varied.In this paper are summed up the principles of the Re-Os dating,progress recently made and the problems remained on basis of its application to molybdenite,sulfides,mantle-derived peridotitic inclusions,organic-rich sedimentary rocks and limestone.Then is put forward the development direction.