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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >~(18)O/~(16)O evidence for an early, short-lived (～ 10 yr), fumarolic event in the Topopah Spring Tuff near the proposed high-level nuclear waste repository within Yucca Mountain, Nevada, USA
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~(18)O/~(16)O evidence for an early, short-lived (～ 10 yr), fumarolic event in the Topopah Spring Tuff near the proposed high-level nuclear waste repository within Yucca Mountain, Nevada, USA

机译：〜（18）O /〜（16）O在美国内华达州尤卡山拟建的高级核废料处置库附近的托波帕春季凝灰岩中发生的一个短暂，早期（〜10年）富马酸事件的证据。

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摘要

~(18)O/~(16)O analyses of rock samples from the Exploratory Studies Facility (ESF) and from three other locations in the vicinity of Yucca Mountain, Nevada, suggest that the uppermost 5-20 m of the 12.8 Ma Topopah Spring Tuff displays a characteristic ~(18)O/~(16)O pattern that is indicative of short-lived (～10 yr), high-temperature (～ 500 ℃), fumarolic meteoric-hydrothermal activity. Hydrothermally altered rock is characterized by 1-3-m-thick zones of ~(18)O-depleted groundmass (down to δ~(18)O = +5.5) located above and locally within the upper vitrophyre, as well as complementary, 2-4-m-thick, overlying zones of ~(18)O-enriched (as high as δ~(18)O = +13.7), mineralogically altered, groundmass. Thirty-four samples of the Topopah Spring Tuff collected below the upper vitrophyre are not hydrothermally altered and correspondingly display a more uniform set of δ~(18)O values (δ~(18)O = +8.6 to + 11.1). Sanidine phenocrysts from fumarolically altered tuff in the upper cooling unit are petrographicaly also display uniform δ~(18)O values (δ~(18)O = +7.80 ± 0.45), which are in isotopic equilibrium with other phenocyrst phases at magmatic temperatures. The ~(18)O/~(16)O signature displayed by the upper part of the Topopah Spring Tuff is analogous to that produced by short-lived (10-25 yr), high-temperature (500 ℃), fumarolic activity in the Bishop Tuff and in the 1912 ash-flow sheet in the Valley of Ten Thousand Smokes, Alaska. The remarkable preservation of a fragile, fumarolic ~(18)O/~(16)O signature in the upper part of the Topopah Spring Tuff indicates that no subsequent hydrothermal alteration of this part of the tuff has occurred.
机译：勘探研究设施（ESF）以及内华达州尤卡山附近其他三个地点的岩石样品的〜（18）O /〜（16）O分析表明，在12.8 Ma Topopah中最高的5-20 m春季凝灰岩表现出〜（18）O /〜（16）O的特征，表明其寿命短（〜10年），高温（〜500℃），富马酸的陨石热液活动。热液蚀变岩石的特征是〜（18）O耗尽的地表层（低至δ〜（18）O = +5.5）的1-3-m厚区域位于上部玻璃体上方和局部内部，以及互补的，富含矿物（〜18）O（高达δ〜（18）O = +13.7）的2-4-m厚的上覆带，矿物学改变了地层。在上部玻璃体下方收集的34个Topopah Spring Tuff样品没有进行热液改变，因此显示出更均匀的δ〜（18）O值集合（δ〜（18）O = +8.6至+ 11.1）。上层冷却单元中经富马酸化改变的凝灰岩的山梨素结晶在岩石学上也显示出均匀的δ〜（18）O值（δ〜（18）O = +7.80±0.45），在岩浆温度下与其他苯酚晶相处于同位素平衡。 Topopah Spring Tuff上部显示的〜（18）O /〜（16）O签名类似于短命（10-25 yr），高温（500℃）的富马酸活性所产生的签名。凝灰岩主教和1912年阿拉斯加一万烟谷的灰流板。在Topopah Spring Tuff的上部显着保留了脆弱的，富马酸的〜（18）O /〜（16）O标记，这表明该凝灰岩的此部分没有发生随后的热液蚀变。

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