Liquiñe-Ofqui Fault

Approximate extent of the Liquiñe-Ofqui Fault shown in red. Note that it is near parallel to the Peru-Chile trench, the coastline, the Chilean Coast Range and the Andes.

The Liquiñe-Ofqui Fault is major geological fault that runs a length of roughly 1200 km in a NNE-SSW orientation and exhibits current seismicity.[1][2] It is located in the Chilean Northern Patagonian Andes. It is a dextral intra-arc transform fault.[2] Most large stratovolcanoes of the Southern Volcanic Zone of the Andes are aligned by the fault which allows for the movement of magma and hydrothermal fluids.[2]

The fault crosses several transverse faults including the Mocha-Villarrica Fault Zone (MVFZ) and the Biobío-Aluminé Fault Zone.[2] The fault have had periods of ductile deformation associated to pluton emplacement be it either at great depths or by shallow intrusions.[3]

The forces that move the fault are derivative of the oblique subduction offshore Chile's coast. This leads to partition of deformation between the subduction zone, the fore-arc and the intra-arc region where the fault lies.[2]

The fault name was coined by Francisco Hervé, I. Fuenzalida, E. Araya and A. Solano in 1979.[4] The fault itself was first inferred by Chilean government agent Hans Steffen around 1900 who referred to it as a "tectonic furrow" (Spanish: surco tectónico).[4]

References

  1. ↑ Lange, D.; Cembrano, J.; Rietbrock, A.; Haberland, C.; Dahm, T.; Bataille, K (April 2008). "First seismic record for intra-arc strike-slip tectonics along the Liquiñe-Ofqui fault zone at the obliquely convergent plate margin of the southern Andes". Tectonophysics. 455 (1–4): 14. Bibcode:2008Tectp.455...14L. doi:10.1016/j.tecto.2008.04.014.
  2. 1 2 3 4 5 Pérez-Flores, Pamela; Cembrano, José; Sánchez-Alfaro, Pablo; Veloso, Eugenio; Arancibia, Gloria; Roquer, Tomás (2016). "Tectonics, magmatism and paleo-fluid distribution in a strike-slip setting: Insights from the northern termination of the Liquiñe–Ofqui fault System, Chile" (PDF). Tectonophysics. 680: 192–210. Bibcode:2016Tectp.680..192P. doi:10.1016/j.tecto.2016.05.016. Retrieved June 1, 2018.
  3. ↑ Adriasola, Alberto C.; Stockhert, Bernhard (2008). "Cooling histories and deformation of plutonic rocks along the Liquiñe-Ofqui Fault Zone, Southern Chile (41°-42°15'S)". Revista Geológica de Chile. 35 (1): 39–61.
  4. 1 2 Hauser, A. (1991). "Hans Steffen, precursor del concepto falla Liquiñe-Ofqui". Revista Geológica de Chile (in Spanish). 18: 177–179.

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