Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/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
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ISSN | 0040-1951 |
EISSN | 1879-3266 |
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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