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首页> 外文期刊>Journal of quaternary science: JQS >Revisiting the Faroe Marine Ash Zone III in two Greenland ice cores: Implications for marine-ice correlations
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Revisiting the Faroe Marine Ash Zone III in two Greenland ice cores: Implications for marine-ice correlations

机译：在两个格陵兰冰芯中重温法罗海洋灰区III：对海冰相关性的启示

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摘要

Nineteen new Icelandic tephra layers are identified in NGRIP and NEEM ice spanning Greenland Interstadial-9 (GI-9) and the early phase of GI-8 (～38 000-40 500 b2k). Fourteen tephras are identified in the NGRIP record and five direct correlatives are identified in NEEM, thus indicating the occurrence of 14 separate volcanic events. With two exceptions, the tephras are tholeiitic basalt in composition and despite having very similar geochemical signatures can, in most cases, be discriminated from one another using their TiO2 values. All of these tephra layers fall within the compositional range of the Faroe Marine Ash Zone III (FMAZ III) deposit previously identified in ocean cores from the Faroes region and previously correlated to NGRIP 2066.95m by Davies et al.. Thus, the FMAZ III in the marine realm is most likely a complex ash zone that represents a series of closely timed Grimsv?tn eruptions that, as yet, can only be stratigraphically separated in the high-resolution ice-core records. The geochemical signatures and stratigraphic positions of the new ice-core layers means that the FMAZ III tephra deposit, as currently defined in the marine realm, cannot be correlated to NGRIP 2066.95m or any other ice-core tephra horizons preserved during this interval.
机译：在跨越格陵兰岛际9号（GI-9）和GI-8的早期阶段（〜38 000-40 500 b2k）的NGRIP和NEEM冰中发现了19个新的冰岛特非拉层。 NGRIP记录中鉴定出14个特弗拉斯，NEEM中鉴定出5个直接相关物，因此表明发生了14次独立的火山事件。除了两个例外，特非拉在成分上是可膨胀的玄武岩，尽管具有非常相似的地球化学特征，但在大多数情况下，可以使用它们的TiO2值相互区分。所有这些提菲拉层都属于法罗群岛海洋灰区III（FMAZ III）沉积物的成分范围，该沉积物先前已在法罗群岛地区的海芯中发现，先前与Davies等人的NGRIP 2066.95m相关。海洋领域很可能是一个复杂的火山灰带，代表着一系列时间紧迫的格里姆斯火山喷发，但迄今为止，这些火山喷发只能在高分辨率冰芯记录中进行地层分离。新冰芯层的地球化学特征和地层位置意味着，目前在海洋领域中定义的FMAZ III特菲拉沉积物不能与NGRIP 2066.95m或在此间隔内保存的任何其他冰芯特菲拉层位相关。

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