Exploration of sedimentary deposits in the Atacama Desert, Chile, using integrated geophysical techniques

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Title:Main Title: Exploration of sedimentary deposits in the Atacama Desert, Chile, using integrated geophysical techniques
Description:Abstract: The Atacama Desert is a unique landscape to understand the evolution of the Earth in extremely arid environments. Clay pans are crucial to comprehend the surface and subsurface processes in areas limited by water availability. We present an integrated geoscientific study to investigate the sedimentary deposits of the Paranal clay pan located in the hyperarid core of the Atacama Desert. We used the loop source transient electromagnetic (TEM) method complemented by magnetics and active seismics to resolve different subsurface properties at different spatial scales. A total of 116 soundings were processed, analyzed, and inverted to investigate the resistivity distribution of the clay pan. The TEM-1D inversion results reveal a three-layered resistivity structure with reliable information down to a depth of 250 m. Colluvial and lacustrine sediments reach a maximum thickness of about 160 ± 10 m. The shape of the lacustrine sediments suggests the presence of an old paleochannel that might be part of the former main Paranal drainage network. In addition, the basement below the clay pan can be partly interpreted as a damaged zone of an inferred strike-slip fault system. Subsequent 2D magnetic modeling confirms the basement depth derived from the TEM results. The seismic transects reveal accurate structural information of the upper 60 m and are consistent with TEM-1D models. High P wave velocities correlate with high electrical conductivity layers and are interpreted as lacustrine sediments. Our work provides key information with respect to the sedimentary thickness above the basement contributing to paleoclimate research in northern Chile.
Identifier:https://doi.org/10.1016/j.jsames.2022.103746 (DOI)
Citation Advice:Blanco-Arrué, B., Yogeshwar, P., Tezkan, B., Mörbe, W., Díaz, D., Farah, B., ... & Wennrich, V. (2022). Exploration of sedimentary deposits in the Atacama Desert, Chile, using integrated geophysical techniques. Journal of South American Earth Sciences, 115, 103746.
Responsible Party
Creators:Barbara Blanco (Author), Pritam Yogeshwar (Principal Investigator), Bülent Tezkan (Author), Wiebke Mörbe (Author), Daniel Díaz (Author), Borja Farah (Author), Stefan Buske (Author), Lukas Ninnemann (Author), Julia Diederich (Author), Volker Wennrich (Principal Investigator)
Contributors:Pritam Yogeshwar (Supervisor), Bülent Tezkan (Supervisor), Wiebke Mörbe (Researcher), Daniel Díaz (Researcher), Volker Wennrich (Supervisor)
Publisher:Journal of South American Earth Sciences
Publication Year:2022
Topic
CRC1211 Topic:Surface
Related Subproject:A2
Subjects:Keywords: Geophysics, Transient Electromagnetic method (TEM)
Geogr. Information Topic:Geoscientific Information
File Details
Filename:BlancoArrue_etal_2022.pdf
Data Type:Data Paper - Article
File Size:19.1 MB
Date:Accepted: 09.02.2022
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
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Download Permission:Free
Download Information:https://doi.org/10.1016/j.jsames.2022.103746
General Access and Use Conditions:According to the CRC1211DB data policy agreement.
Access Limitations:According to the CRC1211DB data policy agreement.
Licence:[Creative Commons] Attribution-NonCommercial-NoDerivs 4.0 Unported (CC BY-NC-ND 4.0)
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Specific Information - Publication
Publication Status:Published
Review Status:Peer reviewed
Publication Type:Article
Article Type:Journal
Source:Journal of South American Earth Sciences
Source Website:https://www.sciencedirect.com/science/article/pii/S0895981122000372
Volume:115
Number of Pages:1 (32767 - 32767)
Metadata Details
Metadata Creator:Bárbara Nataly Blanco Arrue
Metadata Created:19.04.2022
Metadata Last Updated:19.04.2022
Subproject:A2
Funding Phase:2
Metadata Language:English
Metadata Version:V50
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