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首页> 外文期刊>Chemical geology >Precise and accurate Os-186/Os-188 and Os-187/Os-188 measurements by Multi-collector Plasma Ionisation Mass Spectrometry, part II: Laser ablation and its application to single-grain Pt-Os and Re-Os geochronology
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Precise and accurate Os-186/Os-188 and Os-187/Os-188 measurements by Multi-collector Plasma Ionisation Mass Spectrometry, part II: Laser ablation and its application to single-grain Pt-Os and Re-Os geochronology

机译：多收集器等离子体电离质谱法精确，准确地测量Os-186 / Os-188和Os-187 / Os-188，第二部分：激光烧蚀及其在单颗粒Pt-Os和Re-Os地球年代学中的应用

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The abundance of platinum group alloy (PGA) gains available from some alluvial deposits combined with their great chemical resistance to conventional acid attack generates the need for an alternative method of obtaining routine, rapid yet precise Os isotopic data. Laser ablation multi-collector ICP-MS (LA-MC-ICP-MS) is ideally suited for this purpose and has been applied, in a relatively limited extent, to Os-rich samples by previous workers (e.g., Hirata, T., Michinari Hattori, M., and Tsuyoshi Tanaka, T., 1998. In-situ osmium isotope ratio analyses of iridosmines by laser ablation-multiple collector-inductively coupled plasma mass spectrometry. Chem Geol., 144, 269-280.; Malitch, K.N., 2004. Osmium isotope constraints on contrasting sources and prolonged melting in the Proterozoic upper mantle: evidence from ophiolitic Ru-Os sulfides and Ru-Os-Ir alloys. Chem Geol. 208. 157-173.; Walker, R.J., Brandon, A.D., Bird, J.M., Piccolia, P.M., McDonougha, W.F., R.D., Asha, R.D., 2005. Os-187-Os-186 systematics of Os-Ir-Ru alloy grains from southwestern Oregon. Earth Planet. Sci. Lett. 230, 211-226.). The wide variety of PGA minerals yield a broad spectrum of Pt, Re and Os contents which translate into a wide spread in parent-daughter ratios that is an attractive proposition for geochronology using the Re-Os and Pt-Os decay schemes. Here we show that single PGA grains, can contain sufficient internal Re, Pt and Os elemental variability and coupled variations in parent/daughter and daughter isotope compositions that they present an opportunity to obtain 'isochron' ages from two different isotope decay systems.
机译：从某些冲积矿床中获得的大量铂族合金（PGA）以及它们对常规酸侵蚀的强大耐化学性，导致需要一种获取常规，快速而精确的Os同位素数据的替代方法。激光烧蚀多收集器ICP-MS（LA-MC-ICP-MS）非常适合此目的，并且以前的工作人员（例如，Hirata，T。， Michinari Hattori，M.和Tsuyoshi Tanaka，T.，1998年。通过激光烧蚀-多收集器-电感耦合等离子体质谱法对铱进行定量分析，测定铱的含量。Chem Geol。，144，269-280 .; Malitch， KN，2004. O同位素对对比源的约束和元古代上地幔的长期熔融：胶质Ru-Os硫化物和Ru-Os-Ir合金的证据。Chem Geol。208. 157-173 .; Walker，RJ，Brandon， AD，Bird，JM，Piccolia，PM，McDonougha，WF，RD，Asha，RD，2005年，Os-187-Os-186来自俄勒冈州西南部的Os-Ir-Ru合金晶粒的系统，地球行星，科学编号230 ，211-226。）。各种PGA矿物产生的Pt，Re和Os含量范围很广，这转化为父子比的广泛分布，这对于使用Re-Os和Pt-Os衰减方案的年代学来说是一个有吸引力的主张。在这里，我们表明单个PGA晶粒可以包含足够的内部Re，Pt和Os元素变异性以及父/子和子同位素组成的耦合变化，它们提供了从两个不同的同位素衰变系统获得“等时”年龄的机会。

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