| The Coupled Re—Os and Pt—Os Systematics：A Theoretical Consideration |
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| 引用本文： | 熊永良,翟裕生.The Coupled Re—Os and Pt—Os Systematics：A Theoretical Consideration[J].中国地球化学学报,1995,14(1):52-59. |
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| 作者姓名： | 熊永良 翟裕生 |
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| 作者单位： | DepartmentofGeologyandGeologicalEngineering,CollegeofMinesandEarthUniversityofIdaho,Moscow,ID83843,US |
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| 摘 要： | The ^190Pt-^186Os system should be a unique tracer for mantle processes be-cause both Pt and Os are concentrated in the mantle.The ^190Pt-^186Os system will also be a good supplement to the ^187Re-^187Os system for dating and tracing mantle pro-cesses because the ^190Pt-^186Os system is not so easily contaminated by crustal materials as the ^187Re-^187Os system.In turn,the application of the ^187Re-^187Os system to Pt-enriched materials uncontaminated by crustal materials will indirectly refine the half life of ^190Pt.The ^190Pt is refined.In the coupled ^187Re-^187Os and ^190Pt-^186Os sys-tematics,an ^186Os*/^190Pt-^187Os*/^187Re Concordia diagram similar to the ^206Pb*/^238U-^208Pb*/^232Th Concordia can be constructed.In such a Concordia diagram,a date will be obtained so long as the ^190Pt-^186Os system remains closed even if the ^187Re-^187Os sys -tem is contaminated by crustal materials.In addition ,for the coupled ^190Pt-^186Os and ^187Re-^187Os systematics,the mantle processes and the interactions between the mantle and the crust will be described by two ratios:^186Os/^188Os and ^187Os/^188Os .The coupled ^187Re-^187Os and ^190Pt-^186Os systematics will be a powerful tool in the investigation of the geodynamic history of the Earth because the ^187Re-^187Os system is sensitive to the interactions between the mantle and the crust,while the ^190Pt-^186Os system is a good tracer for mantle processes.
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| 关 键 词： | 铼－锇系统 铅－锇系统 地球动力学史 地幔 铼同位素 锇同位素 铅同位素 |
The coupled Re-Os and Pt-Os systematics: A theoretical consideration |
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| Xiong Yongliang,Zhai YuSheng.The coupled Re-Os and Pt-Os systematics: A theoretical consideration[J].Chinese Journal of Geochemistry,1995,14(1):52-59. |
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| Authors: | Xiong Yongliang Zhai YuSheng |
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| Institution: | (1) Department of Geology, University of Alberta, T6G 2E3 Edmoton, Alberta, Canada;(2) Present address: Department of Geology and Geological Engineering, College of Mines and Earth Resources, University of Idaho, 83843 Moscow, ID, USA;(3) China University of Geosciences, 100083 Beijing |
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| Abstract: | The190Pt-186Os system should be a unique tracer for mantle processes because both Pt and Os are concentrated in the mantle. The190Pt-186Os system will also be a good supplement to the187Re-187Os system for dating and tracing mantle processes because the190Pt-186Os system is not so easily contaminated by crustal materials as the187Re-187Os system. In turn, the application of the187Re-187Os system to Ptenriched materials uncontaminated by crustal materials will indirectly refine the half life of190Pt. The190Pt-186Os system will be a promising tracer and chronometer when the decay constant of190Pt is refined. In the coupled187Re-187Os and190Pt-186Os systematics, an186Os*/190Pt-187Os*/187Re concordia diagram similar to the206Pb*/238U-208 Pb*/232Th concordia can be constructed. In such a concordia diagram, a date will be obtained so long as the190Pt-186Os system remains closed even if the187Re-187Os system is contaminated by crustal materials. In addition, for the coupled190Pt-186Os and187Re-187Os systematics, the mantle processes and the interactions between the mantle and the crust will be described by two ratios:186Os/188Os and187Os/187Os. The coupled187Re-187Os and190Pt-186Os systematics will be a powerful tool in the investigation of the geodynamic history of the Earth because the187Re-187Os system is sensitive to the interactions between the mantle and the crust, while the190Pt-186Os system is a good tracer for mantle processes. |
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| Keywords: | coupled Re-Os and Pt-Os systematics 190Pt-186Os system 187Re-187Os system concordia geodynamic history of the Earth mantle process |
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