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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Evolution of a magmatic to a phreatomagmatic volcanic system: The birth of a monogenetic volcanic field, Tilocalar volcanoes, northern Chile
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Evolution of a magmatic to a phreatomagmatic volcanic system: The birth of a monogenetic volcanic field, Tilocalar volcanoes, northern Chile

机译：魔法魔法火山系统的演变：单一的火山田，蒂莱洛尔火山，北智利的诞生

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摘要

The Tilocalar volcanic complex comprises four monogenetic volcanoes located at the southeastern edge of the Salar de Atacama Basin, northern Chile. These monogenetic volcanic centers are the Tilocalar Norte lava, the El Mani dome, the Tilocalar Sur small-lava shield, and the Tilocalar Sur maar, respectively, and were formed between 460 +/- 50 ka to 1 Ma ago along the north-south-striking Tilomonte ridge that underlies the Tucucaro Ignimbrite (3.2 +/- 0.3 Ma). Their formation is the result of an intermediate magma rising to the surface during a local transtensional regime, which is observed at El Mani, under a dominantly compressional tectonic setting. The Tilocalar monogenetic centers provide a rare opportunity to examine the variability from individual and small-volume magma batches to the development of a monogenetic volcanic field. These volcanoes and the control on their eruption styles were studied by geological mapping and stratigraphic considerations, morphometric analysis, textural studies (density and vesicularity), petrographic observations, and geochemical analyzes. The Tilocalar Norte lavas have an intermediate composition (mostly andesite, 62.02 wt.% SiO2) that reach a maximum distance of 3.9 km to the north and 1.2 km to the southwest from their vent, with a dense-rock equivalent (DRE) volume of 8.73 x 10(7) m(3). The El Mani lava dome is small (covering 750 m(2) area and consisting of 1.06 x 10(3) m(3) DRE volume) that presents mingled mafic (63.89 wt.% SiO2) and felsic (73.73 wt.% SiO2) products of the original magma source, related to shallow crustal melts. The Tilocalar Sur small lava-shield is characterized by a pyroclastic fall deposit and lavas. The pyroclastic fall deposit is characterized by agglutinated andesite scoria-spatter fall units, covering 2.81 km(2) and consisting of 7.75 x 10(5) m(3) DRE volume. In contrast, the lavas are characterized by an andesitic composition (57.64 wt.% SiO2), which is 1.8 km in length to the northwest and 1.4 km to the east of their source. These lavas cover an area of 3.78 km(2) with 9.15 x 10(7) m(3) DRE volume. Tilocalar Sur maar crater has an elliptical shape in map view(363 m diameter east-west and 288 m diameter north-south), surrounded by individual conglomerates, sandstones, granitoids, and tuff fragments that lie on the present-day surface around the crater rim. The Tilocalar volcanic complex is interpreted as a small monogenetic volcanic field that shows an eruption history defined by a spectrum of eruptive processes determined by internal and external parameters at any given time from the four independent volcanic centers. (C) 2021 Elsevier B.V. All rights reserved.
机译：Tilocalar火山复合体包括四个单一的火山位于智利北部撒拉德·阿塔卡马盆地的东南部边缘。这些单一的火山中心是Tilocalar Norte Lava，El Mani圆顶，Tilocalar Sur小熔岩屏蔽，以及Tilocalar Sur Maar，并形成460 +/- 50ka至＆沿着北朝鲜的北朝鲜山上脊髓岩石下降，这是Tucucaro Ignimbrite（3.2 +/- 0.3 ma）。它们的形成是在局部触发状态期间上升到表面的中间岩浆的结果，在埃尔马尼观察到在主导的压缩构造构造。 Tilocalar单一的中心提供了一种难以理解的机会，用于检查个体和小体积岩浆批次到单一的火山场的开发中的可变性。通过地质映射和地层考虑，形态学分析，纹理研究（密度和杂质），岩体观察和地球化学分析研究了这些火山和爆发样式的控制。 Tilocalar Norte Lavas具有中间组成（大部分山顶，62.02重量％的SiO2），距离北方的最大距离为3.9公里，从通风口到西南1.2公里，具有致密的岩石等效（DRE）体积8.73 x 10（7）m（3）。 El Mani Lava Dome小（覆盖750米（2）个区域，包括1.06 x 10（3）米（3）个DRE体积），其呈现混合的MAFIC（63.89重量％SiO 2）和铰接（73.73重量％SiO2 ）原始岩浆源的产品，与浅地壳熔体有关。 Tilocalar Sur小熔岩屏蔽的特点是发球菌矿床和熔岩。 Pyroclastic坠落沉积物的特征在于凝集的粘液泡沫塑料落下单元，覆盖2.81 km（2），并由7.75×10（5）m（3）杆体积组成。相比之下，熔岩的特征在于依旧组合物（57.64重量％的SiO 2），其长度为1.8公里，到了西北部和东部1.4公里。这些熔岩覆盖了3.78公里（2）的面积，9.15 x 10（7）m（3）DRE体积。 Tilocalar Sur Maar Crater在地图视图（直径363米的东北和288米直径的南北）有椭圆形的形状，周围环绕着在火山口周围的当前表面上的单独的砾岩，砂岩，花岗岩和凝灰岩碎片轮缘。 Tilocalar火山复合物被解释为小单一的气体火山场，其示出了由来自四个独立火山中心的任何给定时间的内部和外部参数确定的爆发过程谱定义的喷发历史。 （c）2021 Elsevier B.v.保留所有权利。

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  • 来源
    《Journal of Volcanology and Geothermal Research》 |2021年第6期|107243.1-107243.22|共22页
  • 作者

    Ureta Gabriel; Nemeth Karoly; Aguilera Felipe; Kosik Szabolcs; Gonzalez Rodrigo; Menzies Andrew; Gonzalez Cristobal; James Diego;

  • 作者单位

    Univ Catolica Norte Programa Doctorado Ciencias Menc Geol Av Angamos 0610 Antofagasta 1270709 Chile|Univ Catolica Norte Nucleo Invest Riesgo Volcanico Ckelar Volcane Av Angamos 0610 Antofagasta 1270709 Chile;

    Massey Univ Volcan Risk Solut Sch Agr & Environm Turitea Campus Palmerston North 4442 New Zealand;

    Univ Catolica Norte Nucleo Invest Riesgo Volcanico Ckelar Volcane Av Angamos 0610 Antofagasta 1270709 Chile|Ctr Nacl Invest Gest Integrada Riesgo Desastres C Av Vicuna Mackenna 4860 Santiago 7810000 Chile|Univ Catolica Norte Dept Ciencias Geol Av Angamos 0610 Antofagasta 1270709 Chile;

    Massey Univ Volcan Risk Solut Sch Agr & Environm Turitea Campus Palmerston North 4442 New Zealand|Horizons Reg Council Private Bag 11025 Palmerston North 4442 New Zealand;

    Univ Catolica Norte Nucleo Invest Riesgo Volcanico Ckelar Volcane Av Angamos 0610 Antofagasta 1270709 Chile|Univ Catolica Norte Dept Ciencias Geol Av Angamos 0610 Antofagasta 1270709 Chile;

    Bruker Nano GmbH Studio 2D D-12489 Berlin Germany;

    Univ Catolica Norte Programa Doctorado Ciencias Menc Geol Av Angamos 0610 Antofagasta 1270709 Chile|Univ Catolica Norte Nucleo Invest Riesgo Volcanico Ckelar Volcane Av Angamos 0610 Antofagasta 1270709 Chile;

    Univ Catolica Norte Nucleo Invest Riesgo Volcanico Ckelar Volcane Av Angamos 0610 Antofagasta 1270709 Chile;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Central Volcanic Zone (CVZ); monogenetic volcanism; lava flows; domes; small-lava shields; maars;

    机译：中央火山区（CVZ）;单一的火山主义;熔岩流动;圆顶;小型熔岩盾;Maars;

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