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“支撑马里安隆起亏损地幔的薄洋壳证据”论文在《Nature》杂志上正式发表

-Thin crust as evidence for depleted mantle supporting the Marion Rise

    周怀阳为第一作者的《支撑马里安隆起亏损地幔的薄洋壳证据》论文在《Nature》杂志上正式发表,这是我国海洋地质学界首篇第一作者的《Nature》杂志论文。这项研究成果来源于他在2009年至2010年在“大洋一号”环球科考中担任航段首席科学家。
      中国科学院院士汪品先对这篇论文评价道:“这是中国科学家在深海硬岩石研究领域取得的突破性成果,是中国在大洋岩石圈研究上头一回出彩。”

      摘要如下:

      The global ridge system is dominated by oceanic rises reflecting large variations in axial depth associated with mantle hotspots. The little-studied Marion Rise is as large as the Icelandic Rise, considering both length and depth, but has an axial rift (rather than a high) nearly its entire length. Uniquely along the Southwest Indian Ridge systematic sampling allows direct examination of crustal architecture over its full length. Here we show that, unlike the Icelandic Rise, peridotites are extensively exposed high on the rise, revealing that the crust is generally thin, and often missing, over a rifted rise. Therefore the Marion Rise must be largely an isostatic response to ancient melting events that created low-density depleted mantle beneath the Southwest Indian Ridge rather than thickened crust or a large thermal anomaly. The origin of this depleted mantle is probably the mantle emplaced into the African asthenosphere during the Karoo and Madagascar flood basalt events.
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