Abstract
Diverse tectonic regimes and the onset of Andean shortening are chronicled in principally nonmarine clastic deposits of Triassic through Paleogene age in the Eastern Cordillera, Subandean Zone, and Santiago-Marañón foreland basin of northern Peru. Detrital zircon U-Pb geochronological results for 16 sedimentary rock samples from a ~5km thick stratigraphic succession provide a framework to establish new depositional age constraints, infer sediment provenance, and reconstruct sediment routing systems through time. Integration of these results with U-Pb ages from metasedimentary basement samples, additional provenance data, facies distributions, and structural constraints support reconstructions of basin evolution involving: (1) Middle Triassic-Jurassic extension and post-rift thermal subsidence; (2) Late Jurassic-earliest Cretaceous unconformity development; (3) Early Cretaceous renewed regional subsidence; (4) latest Cretaceous shortening-induced flexural subsidence; and (5) Paleogene growth and advance of an integrated flexural foreland basin system.
Original language | English (US) |
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Title of host publication | Andean Tectonics |
Publisher | Elsevier Inc. |
Pages | 269-296 |
Number of pages | 28 |
ISBN (Electronic) | 9780128160091 |
ISBN (Print) | 9780128160107 |
DOIs | |
State | Published - Jan 1 2019 |
Externally published | Yes |
Keywords
- Andes
- Arc magmatism
- Foreland basin
- Peru
- Provenance
- U-Pb geochronology
ASJC Scopus subject areas
- General Earth and Planetary Sciences