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Sediment fill geometry and structural control of the Pampa del Tamarugal basin, northern Chile

2018; Geological Society of America; Volume: 131; Issue: 1-2 Linguagem: Inglês

10.1130/b31722.1

1943-2674

N. Labbé, Marcelo García, Y. Simicic, Eduardo Contreras‐Reyes, Reynaldo Charrier, G. De Pascale, César Arriagada,

Mining and Resource Management

Research Article| September 12, 2018 Sediment fill geometry and structural control of the Pampa del Tamarugal basin, northern Chile N. Labbé; N. Labbé † 1Advanced Mining Technology Center, Universidad de Chile, Avenida Tupper 2007, Santiago, Chile2Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile †nlabbe@ing.uchile.cl Search for other works by this author on: GSW Google Scholar M. García; M. García 1Advanced Mining Technology Center, Universidad de Chile, Avenida Tupper 2007, Santiago, Chile2Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile Search for other works by this author on: GSW Google Scholar Y. Simicic; Y. Simicic 1Advanced Mining Technology Center, Universidad de Chile, Avenida Tupper 2007, Santiago, Chile2Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile Search for other works by this author on: GSW Google Scholar E. Contreras-Reyes; E. Contreras-Reyes 3Departamento de Geofísica, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Avenida Blanco Encalada 2002, Santiago, Chile Search for other works by this author on: GSW Google Scholar R. Charrier; R. Charrier 2Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile4Escuela de Ciencias de la Tierra, Universidad Andres Bello, Sazié 2119, Santiago, Chile Search for other works by this author on: GSW Google Scholar G. De Pascale; G. De Pascale 2Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile Search for other works by this author on: GSW Google Scholar C. Arriagada C. Arriagada 2Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile Search for other works by this author on: GSW Google Scholar Author and Article Information N. Labbé † 1Advanced Mining Technology Center, Universidad de Chile, Avenida Tupper 2007, Santiago, Chile2Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile M. García 1Advanced Mining Technology Center, Universidad de Chile, Avenida Tupper 2007, Santiago, Chile2Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile Y. Simicic 1Advanced Mining Technology Center, Universidad de Chile, Avenida Tupper 2007, Santiago, Chile2Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile E. Contreras-Reyes 3Departamento de Geofísica, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Avenida Blanco Encalada 2002, Santiago, Chile R. Charrier 2Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile4Escuela de Ciencias de la Tierra, Universidad Andres Bello, Sazié 2119, Santiago, Chile G. De Pascale 2Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile C. Arriagada 2Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Plaza Ercilla 803, Santiago, Chile †nlabbe@ing.uchile.cl Publisher: Geological Society of America Received: 07 Dec 2016 Revision Received: 27 Sep 2017 Accepted: 16 May 2018 First Online: 12 Sep 2018 Online Issn: 1943-2674 Print Issn: 0016-7606 © 2018 Geological Society of America GSA Bulletin (2019) 131 (1-2): 155–174. https://doi.org/10.1130/B31722.1 Article history Received: 07 Dec 2016 Revision Received: 27 Sep 2017 Accepted: 16 May 2018 First Online: 12 Sep 2018 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation N. Labbé, M. García, Y. Simicic, E. Contreras-Reyes, R. Charrier, G. De Pascale, C. Arriagada; Sediment fill geometry and structural control of the Pampa del Tamarugal basin, northern Chile. GSA Bulletin 2018;; 131 (1-2): 155–174. doi: https://doi.org/10.1130/B31722.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Determination of the sediment fill geometry and structure of basins along the western flank of the Central Andes is crucial for understanding the regional tectonic evolution and the geological situation of natural resources. In this study, we developed a sediment-thickness distribution model for the Pampa del Tamarugal basin (between 20°20′S and 21°30′S, northern Chile), from surface geological information, available wells, and interpretation and depth conversion of 14 seismic-reflection profiles. Four Oligocene–Holocene units and one Carboniferous–Eocene undifferentiated basement unit were identified in the seismic profiles. For depth conversion, we established an empirical velocity model using P-wave velocities measured from rock samples, with velocity values from 2 to 6 km/s. By interpolating the basal-fill surface from the processed data set, and subtracting it from the topographic surface, we generated an isopach map of the basin, which has a maximum fill thickness of 1566 m. Four N-S–elongated asymmetric subbasins with a fill exceeding 700 m in thickness were identified, and these are separated by four basement highs. Both basement and fill units are folded and cut by west-vergent high-angle reverse faults, which originated before the Oligocene and were reactivated in the Miocene. During the isopach map construction, three sources of error were identified (i.e., topographic adjustment, interpretation, and conversion method), and the mean accumulated thickness error was found to be ±250 m; in addition, the lack of wells as validation data also contributes to the uncertainty. Based on our results, the basin-fill geometry was controlled by both compressional tectonics, which generated uplifted blocks and accommodation spaces, and desertification, which has significantly decreased the sediment input since the late Miocene. Despite the uncertainties, our results provide new insights into Andean tectonics and may be used as a screening tool for natural resources such as minerals and groundwater. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.