Liquiñe-Ofqui's fast slipping intra-volcanic arc crustal faulting above the subducted Chile Ridge.

Liquiñe-Ofqui's fast slipping intra-volcanic arc crustal faulting above the subducted Chile Ridge.
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DOI:
10.1038/s41598-021-86413-w
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发表时间:
2021-03-29
期刊:
影响因子:
4.6
通讯作者:
Gutiérrez F
Gutiérrez F
中科院分区:
综合性期刊3区
文献类型:
--
作者:
De Pascale GP;Froude M;Penna I;Hermanns RL;Sepúlveda SA;Moncada D;Persico M;Easton G;Villalobos A;Gutiérrez F

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利基涅-奥夫基断裂带(LOFZ)的最南端位于巴塔哥尼亚智利海岭斜向俯冲形成的板片窗内。沿着主断层沿着绘制的古地表断裂、偏移和岩性分离图使我们能够首次将地质滑动速率限制为右旋速率11.6-24.6 mm/年(第四纪)和3.6-18.9 mm/年(晚新生代)。我们在绘制LOFZ的地图时遇到了麻烦,因为一个部分坍塌且以前未被发现的火山复合体,马特大火山(VMG:1,280米高,因此维苏威火山大小),它生长在一个破火山口中,也沿着沿着LOFZ偏移,并且具有与相邻的成层火山不同的地球化学特征。除了明确的地震和火山灾害的影响,结构连接沿着主要轨迹的快速滑动LOFZ和VMG的地球化学提供了证据的板片窗口和洞察快速滑动的地壳弧内地壳断层和火山之间的相互作用。
The southernmost portion of the Liquiñe-Ofqui fault zone (LOFZ) lies within the proposed slab window which formed due to oblique subduction of the Chile Ridge in Patagonia. Mapping of paleo-surface ruptures, offsets, and lithological separations along the master fault allowed us to constrain geologic slip rates for the first time with dextral rates of 11.6–24.6 mm/year (Quaternary) and 3.6–18.9 mm/year (Late-Cenozoic) respectively. We had trouble mapping the LOFZ in one local because of a partially collapsed and previously undiscovered volcanic complex, Volcan Mate Grande (VMG: 1,280 m high and thus Vesuvius-sized) that grew in a caldera also offset along the LOFZ and has distinct geochemistry from adjacent stratovolcanoes. Besides the clear seismic and volcanic hazard implications, the structural connection along the main trace of the fast slipping LOFZ and geochemistry of VMG provides evidence for the slab window and insight into interplay between fast-slipping crustal intra-arc crustal faults and volcanoes.
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