The evolution of the Galápagos mantle plume.
The evolution of the Galápagos mantle plume.
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DOI：
10.1126/sciadv.add5030
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发表时间：
2023-03-10
期刊：
影响因子：
13.6
通讯作者：
中科院分区：
文献类型：
--
作者：
与地幔柱有关的熔岩可以在整个地幔中取样并探测其动力学。然而，羽流研究往往只能及时拍摄快照，通常是最近的羽流活动，使地球地幔中主要对流上升的化学和地球动力学演变受到很大的限制。在这里，我们报告的地球动力学的关键信息，如何岩性和密度的羽变化，从羽头阶段的尾巴。我们使用铁稳定同位素和热力学模型来表明，加拉帕戈斯羽在其9000万年的历史中含有少量，几乎恒定的致密循环地壳。尽管在加拉帕戈斯有关熔岩的回收壳源熔体量的时间演变，我们表明，这可以解释单独的羽流冷却，没有相关的变化，在羽流的地幔源;结果也是一致的羽流植根于下地幔低速区也采样原始组件。加拉帕戈斯地幔柱在其历史上含有少量的辉石岩，随着时间的推移，其浮力逐渐减少。
The lavas associated with mantle plumes may sample domains throughout Earth’s mantle and probe its dynamics. However, plume studies are often only able to take snapshots in time, usually of the most recent plume activity, leaving the chemical and geodynamic evolution of major convective upwellings in Earth’s mantle poorly constrained. Here, we report the geodynamically key information of how the lithology and density of a plume change from plume head phase to tail. We use iron stable isotopes and thermodynamic modeling to show that the Galápagos plume has contained small, nearly constant, amounts of dense recycled crust over its 90-million-year history. Despite a temporal evolution in the amount of recycled crust-derived melt in Galápagos-related lavas, we show that this can be explained by plume cooling alone, without associated changes in the plume’s mantle source; results are also consistent with a plume rooted in a lower mantle low-velocity zone also sampling primordial components. The Galápagos plume has contained small amounts of pyroxenite over its history, decreasing its buoyancy through time.
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影响因子：
1.8
作者：
Denyer, Percy;Gazel, Esteban
通讯作者：
Gazel, Esteban
影响因子：
3.5
作者：
Gazel, Esteban;Trela, Jarek;Jicha, Brian
通讯作者：
Jicha, Brian
影响因子：
64.8
作者：
CASTILLO, P
通讯作者：
CASTILLO, P
影响因子：
3.1
作者：
Davis, Fred A.;Tangeman, Jean A.;Hirschmann, Marc M.
通讯作者：
Hirschmann, Marc M.
DOI：
10.1007/978-3-319-15627-9_15
发表时间：
2015-01-01
期刊：
EARTH'S HETEROGENEOUS MANTLE: A GEOPHYSICAL, GEODYNAMICAL, AND GEOCHEMICAL PERSPECTIVE
影响因子：
--
作者：
Deschamps, Frederic;Li, Yang;Tackley, P. J.
通讯作者：
Tackley, P. J.