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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 >Major element heterogeneity in the mantle source of the North Atlantic igneous province
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Major element heterogeneity in the mantle source of the North Atlantic igneous province

机译：北大西洋火成岩省地幔源中的主要元素异质性

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High-MgO (＞8.5% wt%), aphyric lavas erupted at various locations in the North Atlantic igneous province are utilized to characterize the nature of mantle melting during the formation of this province. Based on the observation that the Ni concentration in residual mantle olivine mostly falls in the range of 2000-3500 ppm, these high-MgO samples are corrected for olivine fractionation until the Ni concentration of equilibrium olivine reaches 3500 ppm, to estimate the composition of primary mantle-derived melt. Estimated primary melt compositions suggest that this province is characterized by significant major element source heterogeneity possibly resulting from basalt addition prior to melting. Primary melts for Southwest Iceland and Theistareykir (North Iceland) are shown to require different source mantle compositions. Whereas the Theistareykir primary melt may be explained by the melting of pyrolitic mantle, the source mantle for Southwest Iceland must be enriched in iron, having molar Mg/(Mg+Fe), or Mg#, ＜0.88. This compositional dichotomy in Iceland seems to continue to adjacent Mid-Atlantic Ridge segments, i.e. the Kolbeinsey and Reykjanes Ridges. The primary melts for East and Southeast Greenland also indicate a fertile mantle source, and the estimate of Mg# is the lowest for the East Greenland source mantle (＜0.87). The inferred spatial extent of source heterogeneity suggests the presence of a long-lived compositional anomaly in this igneous province since the opening of the North Atlantic.
机译：在北大西洋火成岩省的不同地点喷出的高镁（> 8.5％wt％）火山熔岩被用来表征该省形成期间地幔融化的性质。根据观察，残留地幔橄榄石中的镍浓度主要在2000-3500 ppm的范围内，对这些高MgO样品进行橄榄石分馏校正，直到平衡橄榄石中的镍浓度达到3500 ppm，以估算原生橄榄石的成分。地幔衍生的熔体。估计的初级熔体成分表明，该省的特征是主要元素源的异质性很可能是由于融化之前加入玄武岩引起的。西南冰岛和Theistareykir（北冰岛）的初生熔体显示需要不同的源地幔成分。尽管Theistareykir初生熔体可以通过热解幔的熔融来解释，但冰岛西南部的源幔必须富含铁，摩尔比为Mg /（Mg + Fe）或Mg＃，＜0.88。冰岛的这种构成二分法似乎继续延续到大西洋中脊相邻的部分，即科贝恩西脊和雷克雅尼斯脊。东格陵兰岛和东南格陵兰岛的初级熔体也显示出肥沃的地幔源，而Mg＃的估算值是东格陵兰岛地幔的最低值（＜0.87）。推断源异质性的空间范围表明，自北大西洋开放以来，该火成岩省存在长期存在的成分异常。

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