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首页> 外文期刊>Geochemistry, geophysics, geosystems >Plume-ridge interaction via melt channelization at Galaapagos and other near-ridge hotspot provinces
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Plume-ridge interaction via melt channelization at Galaapagos and other near-ridge hotspot provinces

机译：Plume-ridge通过Galaapagos和其他近岭热点省份的熔体信道相互作用

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摘要

The interaction of mantle plume driven flow with upwelling flow due to a nearby mid-ocean ridge occurs for many mantle plumes including Galapagos and Iceland. This interaction is typified by trace element and isotopic signatures demonstrating the "contamination" of normal ridge composition by relatively enriched plume material. However, another common signature of plume-ridge interaction is volcanic lineaments linking ridges and nearby plumes, perhaps most conspicuously the Wolf-Darwin lineament (WDL) at Galapagos and the Rodrigues Ridge (RR) at La Reunion. These enigmatic features remain unexplained. Plume-ridge interaction is commonly modeled in terms of interaction between solid-state plume flow and divergent ridge flow, but such models do not likely lead to the kind of solid-state flow channelization that might explain narrow features such as the WDL and RR. Likewise, models involving tapping of anomalously hot and/or fertile asthenosphere between the plume and ridge due to lithospheric faulting appear to be inconsistent with a variety of evidence. We propose an alternative model in which the lineaments are the surface expressions of localized melt channels in the asthenosphere formed due to instabilities in a two-phase partially molten system. A thermodynamic analysis shows that given the magma fluxes inferred to be associated with structures such as WDL and RR, these melt channels can be maintained over plume-ridge distances up to similar to 1000 km. These results suggest that plume-ridge interaction in general, possibly including transport of plume-derived material along ridge axes (e.g., Iceland), may involve transport in high-melt-fraction channels, as opposed to just solid-state mantle flow.
机译：由于包括加拉帕戈斯和冰岛的许多地幔羽毛，披着羽流动流动与附近的中海脊引起的升高流动的相互作用。通过痕量元素和同位素签名通过相对富集的羽流材料表明正常脊组合物的“污染”的同位素。然而，Plume-ridge互动的另一个常见签名是将山脊和附近羽毛的火山谱系，也许是沃尔巴塔戈斯的狼人和罗格里斯岭（RR）在La Reunion上的狼吞虎咽疯狂的逻辑。这些神秘的特征仍然是未解释的。 Plume-ridge交互通常在固态羽流量和发散脊流量之间的相互作用方面建模，但这种模型不太可能导致可以解释诸如WDL和RR等窄特征的固态流动信道。同样，由于岩石故障导致的羽流和脊之间的异常热和/或肥沃的刺激性的模型似乎与各种证据不一致。我们提出了一种替代模型，其中谱系是由于两相部分熔融系统中的不稳定性而形成的静脉圈中局部熔体通道的表面表达。热力学分析表明，考虑到与WDL和RR的结构相关联的岩浆助熔剂，这些熔体通道可以保持在羽流距离上至1000 km的距离。这些结果表明，Plume-ridge相互作用通常包括沿着脊轴（例如，冰岛）的羽流衍生材料的运输，这可能涉及在高熔体分数通道中的运输，而不是固态地幔流。

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