Diagenetic, metamorphic, and hydrogeologic consequences of hydrothermal circulation in subducting crust
Diagenetic, metamorphic, and hydrogeologic consequences of hydrothermal circulation in subducting crust
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俯冲地壳热液循环的成岩、变质和水文地质后果
DOI：
10.1130/ges01653.1
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发表时间：
2018
期刊：
影响因子：
2.5
通讯作者：
Underwood, Michael
中科院分区：
文献类型：
--
作者：
Spinelli, Glenn;Wada, Ikuko;Wang, Kelin;He, Jiangheng;Harris, Robert;Underwood, Michael
俯冲火成岩地壳中的流体循环引起的热量再分配产生热异常，这些热异常可以影响俯冲带内和俯冲前进入的板块中的物质的变化。这种热液循环从俯冲地壳中开采热量，并将其输送到海洋，导致海沟向海物质的温度极高，俯冲带的温度极低。异常高温的传入板块在空间上是有限的，例如，在日本南部的南海边缘，一个高温区是在30公里的增生棱柱变形锋。传入板块（四国盆地）经历了不到200万年的高温异常，所以四国盆地沉积物中的粘土矿物的蚀变仅略有提前，因为热异常。相比之下，俯冲物质被热液循环冷却，因此俯冲沉积物和火成岩的蚀变进一步向陆地移动（即，延迟）;在卡斯卡迪亚和南开边缘，这包括地震推断的位置的玄武岩榴辉岩过渡俯冲地壳。在非常热的边缘，热液循环冷却俯冲板片，并影响俯冲物质在何处以及是否可能熔化。在智利南部，这种冷却有助于解释缺乏一个玄武岩熔融签名弧熔岩，尽管年轻的俯冲岩石圈。最后，通过热液循环的俯冲板片的冷却将流体源从脱水反应进一步向陆地转移，延迟了倾向于降低渗透率的变质反应，并增加了流体粘度。俯冲地壳中的热液循环的响应在最热的俯冲带中最为明显，在那里俯冲基底含水层中的侧向热交换最大。
The redistribution of heat by fluid circulation in subducting igneous crust generates thermal anomalies that can affect the alteration of material both within a subduction zone and in the incoming plate prior to subduction. This hydrothermal circulation mines heat from subducted crust and transports it seaward, resulting in anomalously high temperatures in material seaward of the trench and anomalously low temperatures in the subduction zone. Anomalously high temperatures on the incoming plate are spatially limited; for example, on the Nankai margin of southern Japan, a zone of high temperatures is within ∼30 km of the accretionary prism deformation front. The incoming plate (Shikoku Basin) undergoes the high-temperature anomaly for less than 2 million years; so the alteration of clay minerals in Shikoku basin sediments advances only slightly because of the thermal anomaly. In contrast, subducted material is cooled by hydrothermal circulation, and therefore alteration of subducted sediment and igneous rock is shifted farther landward (i.e., delayed); in the Cascadia and Nankai margins, this includes the seismically inferred locations of the basalt-to-eclogite transition in the subducting crust. In very hot margins, hydrothermal circulation cools the subducting slab and affects where, and if, subducting material may melt. In southern Chile, this cooling helps explain the lack of a basaltic melt signature in arc lavas despite the young subducting lithosphere. Finally, the cooling of the subducting slab via hydrothermal circulation shifts fluid sources from dehydration reactions farther landward, delays metamorphic reactions that tend to reduce permeability, and increases fluid viscosity. The responses to hydrothermal circulation in subducting crust are most pronounced in the hottest subduction zones, where the lateral heat exchange in the subducting basement aquifer is greatest.
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影响因子：
2.8
作者：
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通讯作者：
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影响因子：
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作者：
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影响因子：
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作者：
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通讯作者：
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