Revisiting the Faroe Marine Ash Zone III in two Greenland ice cores: implications for marine‐ice correlations
Revisiting the Faroe Marine Ash Zone III in two Greenland ice cores: implications for marine‐ice correlations
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重新审视两个格陵兰冰芯中的法罗海洋灰烬区 III：对海冰相关性的影响
DOI：
10.1002/jqs.2663
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发表时间：
2013
影响因子：
2.3
通讯作者：
A. Svensson
中科院分区：
文献类型：
--
作者：
A. Bourne;S. Davies;P. Abbott;S. Rasmussen;J. Steffensen;A. Svensson
在NGRIP和NEEM冰中发现了19个新的冰岛火山灰层，这些冰横跨格陵兰岛Interstadial-9（GI-9）和GI-8的早期阶段（约38 000-40 500 b2 k）。NGRIP记录中确定了14个火山岩，NEEM中确定了5个直接相关物，从而表明发生了14次独立的火山事件。除了两个例外，火山岩是拉斑玄武岩的组成，尽管有非常相似的地球化学特征，在大多数情况下，可以区分彼此使用其TiO 2值。所有这些火山灰层都属于法罗群岛海洋火山灰区III（FMAZ III）存款的成分范围，这些存款先前在法罗群岛地区的海洋岩心中发现，并且先前与Davies等人的NGRIP 2066.95 m相关联（）。因此，海洋领域的FMAZ III很可能是一个复杂的火山灰区，代表了一系列时间紧密的Grimsvötn喷发，到目前为止，只能在高分辨率的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，目前在海洋领域定义的FMAZ III火山灰存款不能与NGRIP 2066.95 m或在此期间保存的任何其他冰芯火山灰层位相关联。
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 2066.95 m 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 Grimsvötn 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 2066.95 m or any other ice‐core tephra horizons preserved during this interval.
影响因子：
12.1
作者：
Abbott, Peter M.;Davies, Siwan M.
通讯作者：
Davies, Siwan M.
影响因子：
4
作者：
Abbott, Peter M.;Davies, Siwan M.;Wastegard, Stefan
通讯作者：
Wastegard, Stefan