Andean‐age structure of Eastern Cordillera (Province of La Paz, Bolivia)
Abstract
A Moho root beneath the Bolivian Andes, 40 km deep, is consistent with 230 km of overlap of Neogene age on a single, trenchward dipping transcrustal thrust fault with 10° of finite ramp cutoff (Main Andean Thrust (MAT)). Only 10% of the Andean crustal volume is ascribable to magmatic addition. The MAT is located within South American crust of full thickness. It intersects the basement top 450 km inland from the Neogene crustal margin. It is not a collision suture as shown by persistent pre‐Neogene facies continuity. Thrusting is not accompanied by terrane accretion. The present bilaterally symmetrical thrust belt responds to elastic line loading and to Coulomb rheology. In the hanging wall of the MAT, a deep high‐stress wedge base builds a steep critical slope. In the footwall, the foredeep response is fast subcritical growth by progradation and blind thrusting on a low‐stress decollement. Interaction is maintained by out‐of‐sequence renewal of movement on the MAT.
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If Roeder's high shortening rate estimate is correct, the GPS data and the locked model imply a more dramatic and more recent (post-5 Ma) slowdown.
“If Roeder's [1988] high shortening rate estimate is correct, our data and the locked model imply a more dramatic and more recent (post-5Ma) slowdown.”
From Constraints on present‐day shortening rate across the central eastern Andes from GPS data (1997) · cites this paper as Roeder, 1988
Cross sections in northern Bolivia suggest 135 km shortening in the last 5 Ma.
“Cross sections in northern Bolivia suggest 135 km shortening in the last 5 Ma [Roeder, 1988], i.e., 27 mm/yr average rate.”
From Constraints on present‐day shortening rate across the central eastern Andes from GPS data (1997) · cites this paper as Roeder, 1988
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Constraints on present‐day shortening rate across the central eastern Andes from GPS data
Leffler, L., Stein, S., Mao, A., Dixon, T., Ellis, M. A., Ocola, L., & Sacks, I. S. (1997) · Geophysical Research Letters · doi:10.1029/97gl00770 · Cited by 28 · see citing works
- Authors
- Roeder, D.
- Corresponding author
- Roeder, Dietrich
- Venue
- Tectonics
- Publisher
- American Geophysical Union (AGU)
- Published
- 1988-02
- Volume
- 7
- Issue
- 1
- Pages
- 23-39
- ISSN
- 0278-7407 (ISSN-L)
- 1944-9194
- OpenAlex
- W2134407044
- Cited by
- 172
- References
- 0
- Citations by year
- 2026: 1 · 2025: 1 · 2024: 2 · 2023: 1 · 2022: 8 · 2021: 2 · 2020: 5 · 2019: 4 · 2018: 2 · 2017: 2 · 2016: 2 · 2015: 2 · 2014: 1 · 2013: 2 · 2012: 2
- FWCI
- 3.81
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Tectonics (publishedVersion)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Tectonic Studies in Latin America
- Physical Sciences › Earth and Planetary Sciences › Geology › Geological and Geophysical Studies
- Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geophysical Studies Worldwide
- Keywords
- Eastern Cordillera, décollement, critical slope, out-of-sequence thrusting, foreland basin, Andean orogeny
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