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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 >Imaging the Laguna del Maule Volcanic Field, central Chile using magnetotellurics: Evidence for crustal melt regions laterally-offset from surface vents and lava flows
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Imaging the Laguna del Maule Volcanic Field, central Chile using magnetotellurics: Evidence for crustal melt regions laterally-offset from surface vents and lava flows

机译：使用MagnetOcellurics的Central Chile中央智利成像：从表面通风口和熔岩流动偏移的地壳熔体区域的证据

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Magnetotelluric (MT) data were collected at the Laguna del Maule volcanic field (LdMVF), located in central Chile (36 degrees S, 70.5 degrees W), which has been experiencing unprecedented upward ground deformation since 2007. These data were used to create the first detailed three-dimensional electrical resistivity model of the LdMVF and surrounding area. The resulting model was spatially complex with several major conductive features imaged at different depths and locations around Laguna del Maule (LdM). A near-surface conductor (Cl; 0.5 Omega m) approximately 100 m beneath the lake is interpreted as a conductive smectite clay cap related to a shallow hydrothermal reservoir. At 4 km depth, a strong conductor (C3; 0.3 Omega m) is located beneath the western edge of LdM. The proximity of C3 to the recent Pleistocene-to-Holocene vents in the northwest LdMVF and nearby hot springs suggests that C3 is a hydrous (5 wt% H2O), rhyolitic partial melt with melt fraction 35% and a free-water hydrothermal component. C3 dips towards, and is connected to, a deeper conductor (C4; 1 Omega m). C4 is located to the north of LdM at 8 km depth below surface and is interpreted as a long-lived, rhyolitic-to-andesitic magma reservoir with melt fractions less than 35%. It is hypothesized that the deeper magma reservoir (C4) is providing melt and hydrothermal fluids to the shallower magma reservoir (C3). A large conductor directly beneath the LdMVF is not imaged with MT suggesting that any mush volume beneath LdM must be anhydrous (2 wt% H2O), low temperature and low melt fraction (25%) in order to go undetected. The presence of large conductors to the north has important implications for magma dynamics as it suggests that material may have a significant lateral component (10 km) as it moves from the deep magma reservoir (C4) to create small, ephemeral volumes of eruptible melt (C3). It is hypothesized that there may be a north-south contrast in physical processes a
机译：在Laguna del Maule火山（LDMVF）收集Magnetelluric（MT）数据，位于智利中部（36摄氏度，70.5摄氏度），自2007年以来一直经历前所未有的向上变形。这些数据用于创建第一个详细的LDMVF和周边地区的三维电阻率模型。所得到的模型在空间上复杂，在Laguna del Maule（LDM周围的不同深度和位置上成像的几个主要导电功能。湖下方约100米的近表面导体（Cl; 0.5ωm）被解释为与浅热储层有关的导电蒙脱石粘土帽。在4公里深度，强度的导体（C3; 0.3 omega m）位于LDM的西边缘下方。 C3对最近西北LDMVF和附近的温泉最近的全兴对全新女通风口的接近表明C3是含水（＆ 5wt％H 2 O），菱形部分熔体与熔体馏分＆ 35％和自由 - 水热量组分。 C3倾斜，并连接到更深的导体（C4; 1 OMEGA M）。 C4位于LDM的北部AT＆GT; 8公里深度深度，被解释为长寿命的血管内岩体岩浆储层，熔体分数小于35％。假设更深的岩浆储层（C4）正在向浅岩浆储存器（C3）提供熔体和水热流体。直接在LDMVF下方的大导体不会与MT成像，表明LDM下面的任何糊状体积必须是无水的（＆ 2wt％H 2 O），低温和低熔体馏分（<25％）以便未被发现。北方的大导体的存在对岩浆动力学具有重要意义，因为它表明材料可能具有重要的横向部件（＆ 10公里），因为它从深岩浆储存器（C4）移动到产生的小，短暂的卷起熔体（C3）。假设物理过程中可能存在南北对比

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