Arid
DOI10.1016/j.tecto.2010.10.017
U-series dating of co-seismic gypsum and submarine paleoseismology of active faults in Northern Chile (23 degrees S)
Vargas, Gabriel1; Palacios, Carlos1; Reich, Martin1; Luo, Shangde2,3; Shen, Chuan-Chou4; Gonzalez, Gabriel5; Wu, Yi-Chen2,3
通讯作者Palacios, Carlos
来源期刊TECTONOPHYSICS
ISSN0040-1951
EISSN1879-3266
出版年2011
卷号497期号:1-4页码:34-44
英文摘要

The convergence of the Nazca and South American plates along the subduction margin of the central Andes results in large subduction earthquakes and tectonic activity along major fault systems. Despite its relevance, the paleoseismic record of this region is scarce, hampering our understanding about the relationship between the Andes building and earthquake occurrence. In this study, we used the U-series disequilibrium method to obtain absolute ages of paleoearthquake events associated with normal displacements along the active Mejillones and Salar del Carmen faults in the Coastal Range of the Atacama Desert of northern Chile. The Th-230-U-234 disequilibrium ages in co-seismic gypsum salts sampled along the fault traces together with marine evidences indicate that earthquakes occurred at ca. 29.7 +/- 1.7 ka, 11 +/- 4 ka and 2.4 +/- 0.8 ka. When coupled with paleoseismic marine and radiocarbon (C-14) records in the nearby Mejillones Bay evidencing large dislocations along the Mejillones Fault, the geochronological dataset presented here is consistent with the notion that gypsum salts formed during large earthquakes as a result of co-seismic dilatancy pumping of saline waters along the major faults. Based on maximum observed cumulative vertical offsets in the studied faults, this phenomena could have occurred episodically at a rate in the order of 1:40 to 1:50 with respect to the very large subduction earthquakes during the latest Pleistocene-Holocene period. The results presented here reveal that the U-series disequilibrium method can be successfully applied to date the gypsum salts deposited along faults during seismic events, and therefore directly constrain the age of large paleoearthquakes in hyperarid and seismically active zones. (c) 2010 Elsevier B.V. All rights reserved.


英文关键词U-series dating Submarine paleoseismology Paleoearthquakes Active faults Hyperarid Atacama Desert
类型Article
语种英语
国家Chile ; Taiwan
收录类别SCI-E
WOS记录号WOS:000286718300004
WOS关键词PLASMA-MASS SPECTROMETRY ; PORPHYRY-CU DEPOSITS ; ATACAMA DESERT ; CRUSTAL DEFORMATION ; COPPER-DEPOSITS ; SOUTH-AMERICA ; LEVEL CHANGES ; FORE-ARC ; GEOCHEMICAL ANOMALIES ; COASTAL CORDILLERA
WOS类目Geochemistry & Geophysics
WOS研究方向Geochemistry & Geophysics
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/170681
作者单位1.Univ Chile, Dept Geol, Fac Ciencias Fis & Matemat, Santiago, Chile;
2.Natl Cheng Kung Univ, Earth Dynam Syst Res Ctr, Tainan 701, Taiwan;
3.Natl Cheng Kung Univ, Dept Earth Sci, Tainan 701, Taiwan;
4.Natl Taiwan Univ, Dept Geosci, Taipei 106, Taiwan;
5.Univ Catolica Norte, Fac Ingn & Ciencias Geol, Dept Ciencias Geol, Antofagasta, Chile
推荐引用方式
GB/T 7714
Vargas, Gabriel,Palacios, Carlos,Reich, Martin,et al. U-series dating of co-seismic gypsum and submarine paleoseismology of active faults in Northern Chile (23 degrees S)[J],2011,497(1-4):34-44.
APA Vargas, Gabriel.,Palacios, Carlos.,Reich, Martin.,Luo, Shangde.,Shen, Chuan-Chou.,...&Wu, Yi-Chen.(2011).U-series dating of co-seismic gypsum and submarine paleoseismology of active faults in Northern Chile (23 degrees S).TECTONOPHYSICS,497(1-4),34-44.
MLA Vargas, Gabriel,et al."U-series dating of co-seismic gypsum and submarine paleoseismology of active faults in Northern Chile (23 degrees S)".TECTONOPHYSICS 497.1-4(2011):34-44.
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