DOI: 10.1016/j.tecto.2021.228818
论文题名: Multi-proxy insights into the structure and geometry of the tectonic boundary at the Cordillera de Domeyko-Salar de Atacama border: An example of the interplay between basement and foreland basins
作者: Bascuñán S. ; Maksymowicz A. ; Martínez F. ; Hernández M.J. ; Becerra J. ; Arriagada C.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2021
卷: 807 语种: 英语
中文关键词: Andes
; Gravimetry
; Magnetism
; Salar de Atacama
; Seismic profiles
英文关键词: Buildings
; Accommodation space
; Deformation front
; Extensional faults
; Fault inversions
; Magnetic anomalies
; Sedimentary units
; Seismic reflection profiles
; Tectonic boundaries
; Faulting
; basement rock
; foreland basin
; geomagnetism
; geometry
; gravimetry
; seismicity
; tectonic structure
; Andes
; Antofagasta
; Chile
; Cordillera de Domeyko
; Salar de Atacama Basin
; Atacama
英文摘要: The study of the Cordillera de Domeyko and the Salar de Atacama Basin in northern Chile has been critical to understand the generation of the Andean Cordillera and the migration of the deformation front eastwards. However, the relation between the uplift of the range, its temporal pattern, and the formation of the Preandean Depression have not been fully understood. In this article, we forward modeled two gravimetry surveys, consisting in 185 stations crossing the boundary between the Salar de Atacama Basin and Cordillera de Domeyko, with the goal of understanding the physical traits of each domain and the variations in basin geometry. We interpreted two seismic reflection profiles, along with log data from one well in the basin center, and additionally, we analyzed an inversion of the magnetic anomaly for both lines. The results of the analysis show the segmentation of physical properties into two domains. The first is interpreted as basement (Triassic-older) units, while the other shows the presence of gravity lows correlated with late Mesozoic-Cenozoic units cropping out along the western edge of the basin. The magnetic anomalies identified were correlated with variations within the basement and outcrops of crystalline intrusives. Within the sedimentary units, the Late Cretaceous-Paleogene Purilactis Group and Paleogene-Eocene formations were distinguished from the evaporite-rich Oligocene-Miocene Paciencia Group. The latter was deposited after a compressive event (Incaic Event) which thrusted basement units eastwards, inverted Mesozoic extensional faults, and generated the accommodation space required for its deposition. The basin then experienced renewed compression during the Miocene. This interplay between basement uplift and thrusting, along with fault inversion and basin generation, is a characteristic found in other parts of the Salar de Atacama Basin and the orogen, suggesting that this tectonic style might be prevalent in other basins comprising the Preandean Depression and along the Central Andes. © 2021 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170776
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile; Departamento de Geofísica, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Blanco Encalada 2002, Santiago, Chile; Departamento de Geología, Universidad Católica del Norte, Angamos 0610, Antofagasta, Chile; SQM Salar S.A., El Trovador 4285, Las Condes, Santiago, Chile
Recommended Citation:
Bascuñán S.,Maksymowicz A.,Martínez F.,et al. Multi-proxy insights into the structure and geometry of the tectonic boundary at the Cordillera de Domeyko-Salar de Atacama border: An example of the interplay between basement and foreland basins[J]. Tectonophysics,2021-01-01,807