气候变化领域集成服务门户(CCPortal): Distribution of Temperature and Strength in the Central Andean Lithosphere and Its Relationship to Seismicity and Active Deformation

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DOI	10.1029/2020JB021231
	Distribution of Temperature and Strength in the Central Andean Lithosphere and Its Relationship to Seismicity and Active Deformation
	Ibarra F.; Prezzi C.B.; Bott J.; Scheck-Wenderoth M.; Strecker M.R.
发表日期	2021
ISSN	21699313
卷号	126 期号:5
英文摘要	We present three-dimensional (3D) models of the present-day steady-state conductive thermal field and strength distribution in the lithosphere beneath the Central Andes. Our primary objective was to investigate the influence that the structure of the Central Andean lithosphere has on its thermal and rheological state, and the relationship between the latter and the active deformation in the region. We used our previous data-driven and gravity-constrained 3D density model as starting point for the calculations. We first assigned lithology-derived thermal and rheological properties to the different divisions of the density model and defined temperature boundary conditions. We then calculated the 3D steady-state conductive thermal field and the maximum differential stresses for both brittle and ductile behaviors. We find that the thickness and composition of the crust are the main factors affecting the modeled thermal field, and consequently also the strength distribution. The orogen is characterized by a thick felsic crust with elevated temperatures and a low integrated strength, whereas the foreland and forearc are underlain by a more mafic and thinner crust with lower temperatures and a higher integrated strength. We find that most of the intraplate deformation coincides spatially with the steepest strength gradients and suggest that the high potential energy of the orogen together with the presence of rheological lateral heterogeneities produce high compressional stresses and strong strain localization along the margins of the orogen. We interpret earthquakes within the modeled ductile field to be related to the weakening effect of long-lived faults and/or the presence of seismic asperities. © 2021. The Authors.
英文关键词	Active deformation; Central Andes; rheological modeling; thermal modeling
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187170
作者单位	CONICET-Universidad de Buenos Aires, Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGeBA), FCEyN, Ciudad Universitaria, Buenos Aires, Argentina; Institut für Geowissenschaften, Universität Potsdam, Potsdam, Germany; GFZ – German Research Center for Geosciences, Potsdam, Germany; Department of Geology, Geochemistry of Petroleum and Coal, RWTH Aachen University, Aachen, Germany
推荐引用方式 GB/T 7714	Ibarra F.,Prezzi C.B.,Bott J.,et al. Distribution of Temperature and Strength in the Central Andean Lithosphere and Its Relationship to Seismicity and Active Deformation[J],2021,126(5).
APA	Ibarra F.,Prezzi C.B.,Bott J.,Scheck-Wenderoth M.,&Strecker M.R..(2021).Distribution of Temperature and Strength in the Central Andean Lithosphere and Its Relationship to Seismicity and Active Deformation.Journal of Geophysical Research: Solid Earth,126(5).
MLA	Ibarra F.,et al."Distribution of Temperature and Strength in the Central Andean Lithosphere and Its Relationship to Seismicity and Active Deformation".Journal of Geophysical Research: Solid Earth 126.5(2021).