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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Structural control on volcanism at the Ubinas, Huaynaputina, and Ticsani Volcanic Group (UHTVG), southern Peru
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Structural control on volcanism at the Ubinas, Huaynaputina, and Ticsani Volcanic Group (UHTVG), southern Peru

机译：秘鲁南部Ubinas，Huaynaputina和Ticsani火山群（UHTVG）的火山活动的结构控制

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The Ubinas-Huaynaputina-Ticsani Volcanic Group (UHTVG) developed oblique to and approximately 30-70 km behind the main arc of the Central Volcanic Zone in southern Peru. Detailed study at Volcan Huaynaputina revealed the importance of four fault systems trending NW-SE, E-W, NE-SW, and N-S in the development and evolution there. By using remote sensing and ground truthing, we extend those observations through a synoptic analysis of regional structures and reveal that the entire UHTVG has been controlled by these same structures. Local tectonic regime and evolution of these structures have controlled the development of the magma systems: from the volcano locations, to magma ascent, and the evolution of the edifices. We unravel a history that shows that during uplift of the Andes and prior to the end of the Pliocene, the UHTVG area was in an E-W extensional regime and the Rio Tambo graben formed, enclosing Cretaceous volcanics of the Matalaque Formation. The graben subsided along N-S trending normal faults activated through lateral motion along sinistral, NE-SW strike-slip faults. In the Mid-Pleistocene, the extensional regime shifted to a N-S direction and NW-SE sinistral strike-slip faults became active. We determined that one NW-SE fault dislocated the Rio Tambo graben by 5 km as well as rotated the southern block by 25°. The volcanoes of the UHTVG are positioned at various corners of the graben where crustal gaps likely opened at the intersections of N-S trending normal faults and NW-SE strike-slip faults. This fault geometry not only affected magma ascent but also the morphology of each volcanic center. For example, the SE flank of Ubinas was heavily breached by the NW-SE strike-slip fau eruptive vents of Huaynaputina developed at the intersection of NW-SE and N-S faults and an 800-m wide non-coherent collapse caldera formed along these faults in conjunction with an E-W fau the Ticsani edifice nearly completely collapsed due to displacement along a NW-SE fault and most recently, three associated lava domes were emplaced along a N-S fault. Overall, the UHTVG exhibits multiple effects of tectonic structures on magmatism and volcanism.
机译：Ubinas-Huaynaputina-Ticsani火山群（UHTVG）向秘鲁南部中央火山区主弧倾斜并向后延伸约30-70 km。在Volcan Huaynaputina进行的详细研究表明，四个故障系统在西北地区发展，演化的过程中，趋向于NW-SE，E-W，NE-SW和N-S的重要性。通过使用遥感和地面实况，我们通过对区域结构的概要分析扩展了这些观测结果，并揭示了整个UHTVG都由这些相同的结构控制。局部构造体制和这些构造的演化控制着岩浆系统的发展：从火山的位置到岩浆上升以及建筑物的演化。我们揭示的历史表明，在安第斯山脉隆起期间以及上新世末之前，UHTVG地区处于E-W扩张状态，Rio Tambo grab陷形成，圈闭了Matalaque组的白垩纪火山。 grab爪沿着N-S趋势正断层消退，该断层通过沿东北NE-SW走滑断层的横向运动而激活。在中更新世，伸展体制转向南北向，北西南西向左走向走滑断裂活动。我们确定一个西北偏南断层使里约坦博被俘的地块错位了5公里，并使南部地块旋转了25°。 UHTVG的火山位于抓斗的各个角落，那里的地壳间隙可能在N-S趋势正断层和NW-SE走滑断层的相交处打开。断层的几何形状不仅影响了岩浆上升，而且影响了每个火山中心的形态。例如，NW-SE走滑断层严重破坏了Ubinas的东南侧。 Huaynaputina的喷发孔在NW-SE和N-S断层的交汇处形成，沿着E-W断层沿这些断层形成的800m宽的非相干塌陷破火山口；由于沿NW-SE断层的位移，Ticsani建筑物几乎完全坍塌，最近，沿N-S断层放置了三个相关的熔岩穹顶。总体而言，UHTVG表现出构造结构对岩浆作用和火山作用的多种影响。

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