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首页> 外文期刊>Journal of South American earth sciences >Crustal structure of the Central Precordillera of San Juan, Argentina (31°S) using teleseismic receiver functions
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Crustal structure of the Central Precordillera of San Juan, Argentina (31°S) using teleseismic receiver functions

机译：阿根廷圣胡安（31°S）中央震颤的地壳结构，采用远震接收机功能

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摘要

The subduction of the Nazca plate under the South American plate around 31°S is characterized by flat slab geometry. The (Chilean) Pampean flat slab of Argentina associated with the subduction of the Juan Fernandez ridge lies in a region of a series of foreland uplifts corresponding to the thin-skinned Precordillera and basement cored Sierras Pampeanas ranges. The SIEMBRA project deployed 40 broadband stations in 2008-2009 in both the Precordillera and the Sierras Pampeanas with the aim to foster the understanding of the entire central Andean flat slab region. One of the SIEMBRA station (DOCA) located on the western flank of Sierra de la Invernada in the Central Precordillera appears particularly appropriate to study the crustal structure and eventually detect discontinuities related to terranes establishment. We thus performed a receiver function analysis using teleseismic data recorded at the DOCA station during the SIEMBRA project and from October 2011 to June 2012 using a broadband UNSJ (National University of San Juan) seismic station with the purpose to obtain crustal images with details of the intracrustal structure consistent with a mechanism that could explains both the observed earthquake depths and the uplift pattern in the Central Precordillera. Our results show that the Moho beneath the Precordillera lies at a depth of about 66 km. The Moho signal appears diminished and behaves irregularly as a function of azimuthal orientations. Although this observation could be the result of an irregular geometry it also correlates with the hypothesis of partial eclogitisation in the lower crust. Two midcrustal discontinuities have also been revealed. The shallower one could correspond to a decollement level between the Precordilleran strata and the Cuyania basement at 21 km depth. The deeper one which the presence has been matched with a sharp decrease of the crustal seismic activity drove us to the hypothesis of a major change in crustal composition at 36 km. Finally the flat portion of the subducted slab has been imaged lying at about 100 km depth.
机译：纳斯卡板块在31°S附近在南美板块上的俯冲特征是平板几何形状平坦。与胡安·费尔南德斯山脊的俯冲作用有关的阿根廷（智利）潘普拉斯平坦平板位于一系列前陆隆起的区域，对应于薄皮的前鞭毛虫和地下室核心山脉塞拉内斯潘潘亚纳斯山脉。 SIEMBRA项目于2008-2009年在Precordillera和Sierras Pampeanas部署了40个宽带站，目的是增进对整个安第斯中部平板区域的了解。 SIEMBRA站（DOCA）之一位于前Precordillera中部Sierra de la Invernada的西翼，似乎特别适合研究地壳结构并最终检测与地层建立有关的不连续性。因此，我们使用SIEMBRA项目期间以及2011年10月至2012年6月期间在DOCA站记录的远震数据进行了接收器功能分析，目的是使用宽带UNSJ（圣胡安国立大学）地震台站，目的是获取带有地震波细节的地壳图像。壳内构造与一种机制相一致，可以解释观测到的地震深度和中央前壁的隆升模式。我们的结果表明，Precordillera下面的莫霍面位于约66公里的深度。 Moho信号似乎减弱了，并且随方位角方向的变化而表现不规则。尽管这种观察可能是不规则几何形状的结果，但它也与下地壳部分发炎的假说有关。还发现了两个中壳间断。浅层可能对应于21公里深度的Precordilleran地层与Cuyania地下室之间的挠曲程度。地壳深处的存在与地壳地震活动的急剧减少相吻合，使我们想到了在36 km处地壳成分发生重大变化的假说。最终，对俯冲板的平坦部分进行了成像，其深度约为100 km。

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  • 来源
    《Journal of South American earth sciences》 |2013年第10期|100-109|共10页
  • 作者

    Jean-Baptiste Ammirati; Patricia Alvarado; Marcelo Perarnau; Mauro Saez; Guillermo Monsalvo;

  • 作者单位

    Departamento de Geofisica y Astronomia, Facultad de Ciencias Exactas, Fisicas y Naturales (FCEFyN) de la Universidad Nacional de San Juan, Meglioli 1160 Sur, 5406 Rivadavia, San Juan, Argentina,Agenda Nacional de Promotion Cientifica y Tecnologica (ANPCyT-FONCyT), Argentina;

    Departamento de Geofisica y Astronomia, Facultad de Ciencias Exactas, Fisicas y Naturales (FCEFyN) de la Universidad Nacional de San Juan, Meglioli 1160 Sur, 5406 Rivadavia, San Juan, Argentina,Consejo Nacional de Investigations Cientificas y Tecnicas (CONICET), Argentina;

    Departamento de Geofisica y Astronomia, Facultad de Ciencias Exactas, Fisicas y Naturales (FCEFyN) de la Universidad Nacional de San Juan, Meglioli 1160 Sur, 5406 Rivadavia, San Juan, Argentina,Consejo Nacional de Investigations Cientificas y Tecnicas (CONICET), Argentina;

    Departamento de Geofisica y Astronomia, Facultad de Ciencias Exactas, Fisicas y Naturales (FCEFyN) de la Universidad Nacional de San Juan, Meglioli 1160 Sur, 5406 Rivadavia, San Juan, Argentina;

    Departamento de Geofisica y Astronomia, Facultad de Ciencias Exactas, Fisicas y Naturales (FCEFyN) de la Universidad Nacional de San Juan, Meglioli 1160 Sur, 5406 Rivadavia, San Juan, Argentina,Agenda Nacional de Promotion Cientifica y Tecnologica (ANPCyT-FONCyT), Argentina;

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  • 正文语种 eng
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  • 关键词

    Andean retroarc; Flat slab; Decollement; Partial eclogitisation; Continental crust; Moho;

    机译：安第斯后弧;平板清除局部发炎;大陆地壳;莫霍;

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