气候变化领域集成服务门户(CCPortal): Joint Inversion of Receiver Functions and Surface-Wave Dispersion in the Pantanal Wetlands: Implications for Basin Formation

CCPortal

DOI	10.1029/2019JB018337
	Joint Inversion of Receiver Functions and Surface-Wave Dispersion in the Pantanal Wetlands: Implications for Basin Formation
	Cedraz V.; Julià J.; Assumpção M.
发表日期	2020
ISSN	21699313
卷号	125 期号:2
英文摘要	The origin and evolution of the Pantanal basin have been investigated through velocity-depth profiles developed from the joint inversion of receiver functions and surface-wave dispersion velocities at 33 broadband stations. The Pantanal basin is a shallow and wide depression in South-Central Brazil that developed within the Andean foreland in response to loads and flexural bending of the South American plate. Our results reveal the existence of up to four different crustal types that correlate with surface geology: (i) crust of 35 km with VS < 4.0 km/s, under the basin and along the SW projection of the Transbrasiliano lineament (TBL); (ii) crust of 45 km with VS > 4.0 km/s below 40 km depth, flanking the basin to the east and west; (iii) crust of 50–55 km with VS > 4.0 km/s below 40 km depth, flanking the basin to the north and south and along the TBL; and (iv) crust of 42.5–45.0 km with VS < 4.0 km/s in the neighboring Paraná basin. Existing geodynamic models propose that the Pantanal basin formed either in the back-bulge of the flexural system or at the top of the forebulge, due to extensional bending stresses that reactivated preexisting faults in the shallow upper crust. We argue that the Pantanal basin was formed in a structurally weaker portion of the foreland crust that was affected by delamination and enhanced bending of the South American plate. Our findings do not allow for discrimination among the competing models but suggest that the TBL was critical in marking the location, origin, and evolution of this basin. ©2019. American Geophysical Union. All Rights Reserved.
英文关键词	Andean foreland bulge; joint inversion; Pantanal basin; receiver function; surface-wave dispersion; Transbrasiliano lineament
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/187944
作者单位	Programa de Pós-Graduação em Geodinâmica e Geofísica, UFRN, Natal, Brazil; Departamento de Geofísica, UFRN, Natal, Brazil; Instituto de Astronomia, Geofísica e Ciências Atmosféricas, USP, São Paulo, Brazil
推荐引用方式 GB/T 7714	Cedraz V.,Julià J.,Assumpção M.. Joint Inversion of Receiver Functions and Surface-Wave Dispersion in the Pantanal Wetlands: Implications for Basin Formation[J],2020,125(2).
APA	Cedraz V.,Julià J.,&Assumpção M..(2020).Joint Inversion of Receiver Functions and Surface-Wave Dispersion in the Pantanal Wetlands: Implications for Basin Formation.Journal of Geophysical Research: Solid Earth,125(2).
MLA	Cedraz V.,et al."Joint Inversion of Receiver Functions and Surface-Wave Dispersion in the Pantanal Wetlands: Implications for Basin Formation".Journal of Geophysical Research: Solid Earth 125.2(2020).