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首页> 外文期刊>Journal of Volcanology and Geothermal Research >The geological and structural evolution of the long-lived Miocene-Pleistocene La Hoyada Volcanic Complex in the geodynamic framework of the Central Andes, Argentina
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The geological and structural evolution of the long-lived Miocene-Pleistocene La Hoyada Volcanic Complex in the geodynamic framework of the Central Andes, Argentina

机译：阿根廷中部安第斯山脉地球动力学框架中的中新世-更新世拉霍亚达火山复合体的地质和结构演化

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The long-lived La Hoyada Volcanic Complex (LHVC) is located in the east of Cordillera de San Buenaventura in Argentina. This region is important for understanding of the geodynamic evolution of the Southern Puna, since it is located in its southern edge, where the transition between normal and low-angle subduction occurs. The aim of this work is to contribute to the knowledge of the volcanism of the Southern Puna through the analysis of the stratigraphy and geological evolution of LHVC. Fieldwork and image analysis have led to a new lithostratigraphic scheme, that identifies lithosomes and unconformity-bounded stratigraphic units defining the stratigraphic architecture of the LHVC. New Ar-40/Ar-39 ages further constrain the geological evolution of this complex. The resulting stratigraphic scheme combines the lithostratigraphic units into lithosomes and synthemic units, with the identification of at least six superimposed eruptive centers and their products during the LHVC evolution. A new stratigraphic framework for the eastern Cordillera de San Buenaventura, composed by four supersynthems separated by unconformities that reflect periods of quiescence of the volcanic activity, catastrophic destructive events and changes in the magmatic plumbing system, is proposed: 1) San Buenaventura supersynthem (ca. 9-7 Ma), including mainly explosive rhyolitic volcanism; 2) Lower La Hoyada supersynthem (ca. 7-<4.63 Ma), comprising andesitic-dacitic lava flows and domes characterized by a pervasive compressive tectonic deformation; 3) Upper La Hoyada supersynthem (4.63-1.37 Ma), mainly represented by arc-related, calc-alkaline, andesitic-dacitic effusive products and subordinated pyroclastic and epiclastic deposits; and 4) Purulla supersynthem (<1.37 Ma), which comprises volcanic products with bimodal composition related to a Pleistocene extensional volcanotectonic fault system. The application of unconformity-based stratigraphic units provides a powerful tool for understanding the volcanic evolution of eroded long-lived volcanic complexes, with an effective reconstruction of the temporal and spatial relationships among constructive and destructive phases of the volcano history, correlated with the regional volcanic, magmatic and tectonic evolution of the southern Puna. (C) 2018 Elsevier B.V.
机译：长寿的拉霍亚达火山综合体（LHVC）位于阿根廷的科迪勒拉－德圣布埃纳文图拉的东部。该区域位于南部边缘，在此范围内发生法向俯冲与低角度俯冲之间的过渡，因此对于理解南普那的地球动力学演变非常重要。这项工作的目的是通过分析LHVC的地层和地质演化，为了解南普纳岛的火山活动做出贡献。现场工作和图像分析导致了一种新的岩相地层学方案，该方案可识别定义LHVC地层结构的岩体和不整合面边界层。新的Ar-40 / Ar-39年龄进一步限制了该复合物的地质演化。最终的地层方案将岩石地层单元合并为岩石小体和合成单元，并在LHVC演化过程中识别出至少六个叠加的喷发中心及其产物。提出了一种由四个超综合组成的东部地层山脉的新地层框架，该超综合由不整合面分开，这些不整合面反映了火山活动的静止，灾难性破坏性事件和岩浆管道系统变化的时期：1）San Buenaventura supersynthem（ca 9-7 Ma），主要包括爆炸性流纹岩火山作用； 2）下拉霍亚达（La Hoyada）超合成岩（约7- <4.63 Ma），包括安山岩—胶水熔岩流和穹顶，其特征是普遍的压缩构造变形； 3）上拉霍亚达超合成（4.63-1.37 Ma），主要表现为弧相关，钙碱性，安山性至达吉特​​喷出物以及次生火山碎屑和表层碎屑沉积； 4）Purulla超合成（<1.37 Ma），它包括与更新世伸展的火山构造断裂系统有关的双峰组成的火山产物。基于不整合面的地层单元的应用提供了一个强大的工具，可用于了解受侵蚀的长寿火山复合体的火山演化，并有效地重建了火山历史的建设性和破坏性阶段之间的时空关系，并与区域性火山相关南部的岩浆和构造演化。 （C）2018爱思唯尔B.V.

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