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Lunar apatite with terrestrial volatile abundances

机译：月球磷灰石，陆地挥发物丰富

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摘要

The Moon is thought to be depleted relative to the Earth in volatile elements such as H, Cl and the alkalis. Nevertheless, evidence for lunar explosive volcanism4'5 has been used to infer that some lunar magmas exsolved a CO-rich and CO_2-rich vapour phase before or during eruption. Although there is also evidence for other volatile species on glass spherules, until recently there had been no unambiguous reports of indigenous H in lunar rocks. Here we report quantitative ion microprobe measurements of late-stage apatite from lunar basalt 14053 that document concentrations of H, Cl and S that are indistinguishable from apatites in common terrestrial igneous rocks. These volatile contents could reflect post-magmatic metamorphic volatile addition or growth from a late-stage, interstitial, sulphide-saturated melt that contained ～1,600 parts per million H_2O and ～3,500 parts per million Cl. Both metamorphic and igneous models of apatite formation suggest a volatile inventory for at least some lunar materials that is similar to comparable terrestrial materials. One possible implication is that portions of the lunar mantle or crust are more volatile-rich than previously thought.
机译：人们认为月球相对于地球而言会消耗H，Cl和碱等挥发性元素。然而，已使用月球爆炸火山作用的证据4'5推断某些月球岩浆在喷发之前或期间溶解了富含CO和富含CO_2的汽相。尽管也有证据表明玻璃小球上还有其他挥发性物质，但直到最近还没有明确报道月球岩石中存在H。在这里，我们报告了来自月玄武岩14053的后期磷灰石的定量离子微探针测量，该测量记录了与普通陆地火成岩中磷灰石无法区分的H，Cl和S的浓度。这些挥发物含量可能反映了岩浆后变质挥发物的添加或增长，是后期，间隙，硫化物饱和的熔体所含，其含量为每百万H2O约1600份和每百万Cl约3500份。磷灰石形成的变质和火成模型都表明至少一些月球物质的挥发物库存与类似的陆地物质相似。一个可能的暗示是，月幔或地壳的某些部分比以前认为的更易挥发。

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  • 来源
    《Nature》 |2010年第7305期|P.466-469|共4页
  • 作者

    Jeremy W. Boyce; Yang Liu; George R. Rossman; Yunbin Guan; John M. Eiler; Edward M. Stolper; Lawrence A. Taylor;

  • 作者单位

    Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125-2500, USA Department of Earth and Space Sciences, University of California, Los Angeles, California 90095-1567, USA;

    rnPlanetary Geosciences Institute, Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, Tennessee 37996, USA;

    rnDivision of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125-2500, USA;

    rnDivision of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125-2500, USA;

    rnDivision of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125-2500, USA;

    rnDivision of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125-2500, USA;

    rnPlanetary Geosciences Institute, Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, Tennessee 37996, USA;

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