Table 1 Late-Cenozoic to present LOFZ geological seperation and displacement evidence with associated dextral, strike slip, slip rates.
From: Liquiñe-Ofqui’s fast slipping intra-volcanic arc crustal faulting above the subducted Chile Ridge
Number, type of displacement and description | Displacement (km or m) | Age range (years) | Study evidence is derived from | Slip rate or range (mm/year) |
|---|---|---|---|---|
(1) Geological and Geomorphic Offset, Golfo de Pena, the roughly circular embayment that penetrates approximately 100 km into the Southern Andes and which likely formed as a pull-apart basin in response to the northward migration of the Chiloe Block along the LOFZ. Provides a minimum slip rate since 11.6 to 5.3 Ma (Figs. 1 and 2) | ~ 100 km | 11.6 to 5.3 Ma Late Miocene | Forsythe and Nelson (1985), Murdie et al. (1993) | 8.6 to 18.9 (mean 13.8) |
(2) Geologic Separation; Miocene Granodiorites, Diorites and tonalities, located East of the LOFZ near the northern end of the Golfo de Penas (Shown in Fig. 2). West of the LOFZ, this same unit is located -65 km to the north. Provides a minimum slip rate since 18 to 5.3 Ma (Fig. 2) | 65 ± 5 km | 18.0 to 5.3 Ma Miocene | This study using SERNAGEOMIN, 2003 regional geology | 3.6 to 12.3 (mean 8.0) |
(3) Quaternary geomorphic offset, Huemules Range, with an offset southern valley wall from the Huemules Cirque (HC). Provides a post-LGM dextral slip rate (Figs. 5 and 6) | ~ 400 ± 25 m | 17.3 ka Post-LGM Quaternary | This study—remote sensing & SfM. Deglaciation not earlier than 18–17 ka from Hein et al. (2010) | 21.7 to 24.6 (mean 23.1) |
(4) Quaternary geomorphic offset, Huemules Range, offset of a cliff wall, likely post-Younger Dryas (YD). (Figs. 5 and 6) | 150 m | 12.9 to 11.7 ka Post-Younger Dryas | This study using remote sensing SfM. Younger Dryas was from 12.9 to 11.7 ka from Glasser et al. (2012) | 11.6 to 12.8 (mean 12.2) |
Arithmetic mean dextral late-cenozoic LOFZ strike slip | 14.3 ± 7 |
