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首页> 外文期刊>Geophysical Research Letters >Anomalously high delta D values in the mantle - art. no. 2008
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Anomalously high delta D values in the mantle - art. no. 2008

机译：地幔中异常高的D值-艺术。没有。 2008年

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Hydrogen isotopic compositions of four amphibole grains from three lherzolite xenoliths hosted in Cenozoic basanites of Nushan, eastern China have been analyzed by ion microprobe. deltaD values of all analyzed points range from 94 to +46parts per thousand. Large heterogeneities of D/H ratios within single grains have been observed with variations of deltaD up to 80parts per thousand on the scale of less than 400 m m. Neither correlation between deltaD values and water contents of the analyzed points nor regular variation between deltaD values and positions of analyzed points within the same grain can be found, implying that the scatter of deltaD values could not result from a late shallow process such as hydrogen loss or hydrothermal alterations and should be considered as inherited from the source at depth. Chemical compositions of Nushan amphiboles are very homogeneous, excluding the possibility that the scatter of deltaD values could arise from variable fractionation factors between a single fluid source and minerals. Therefore, metasomatic fluids responsible for the formation of Nushan amphiboles should have variable and unusually high hydrogen isotopic compositions. We suggest that this variation in the metasomatic fluids could be related to melt degassing in the mantle source. [References: 18]
机译：通过离子微探针分析了来自中国东部怒山新生代玄武岩中的三种斜纹沸石异质岩中的四个闪石颗粒的氢同位素组成。所有分析点的deltaD值范围为94至+46千分之几。已经观察到单个晶粒内D / H比的较大异质性，在小于400 m m的范围内，deltaD的变化高达千分之80。既无法找到deltaD值与被分析点的含水量之间的相关性，也无法找到deltaD值与被分析点在同一晶粒内的位置之间的规律变化，这暗示了deltaD值的散布不可能是由于后期的浅层过程（例如氢损失）而导致或热液蚀变，应被认为是从深处继承而来的。怒山闪石的化学成分非常均一，排除了δD值散布可能由单一流体源和矿物之间的可变分馏因子引起的可能性。因此，负责形成怒山闪石的交代流体应具有可变且异常高的氢同位素组成。我们认为，交代流体的这种变化可能与地幔源中的熔体脱气有关。 [参考：18]

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