气候变化领域集成服务门户(CCPortal): The great tectonic discontinuity of Bahía de Banderas, Mexico

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DOI	10.1016/j.tecto.2021.228762
	The great tectonic discontinuity of Bahía de Banderas, Mexico
	Alvarez R.; Corbo-Camargo F.; Yutsis V.
发表日期	2021
ISSN	00401951
卷号	803
英文摘要	Detachment of the Baja California peninsula from the North American plate altered the crustal region between them, including an extension of the crust between the peninsula and Mexico's mainland. In the SE portion of this region Bahía de Banderas, a 60-km indentation in the littoral of Mexico, is a boundary region across which significant changes in topography, seismicity, seismic attenuation, trench subduction angle, continental platform width, geomagnetic field, and crustal thickness have been documented. Here we identify two additional, major discontinuities: one in gravity and the second in the regional electrical resistivity to 50-km depth, both associated with the region in which the crust changes from extended to un-extended. Under the former, we ratify and extend the presence of the oceanic slab obtained elsewhere with seismological determinations. Plate rollback is also reported in the boundary region. Gravity and electrical resistivity models locate the NW and SE limits of the rolled-back portion of the oceanic slab; within this region, we identify upwelling asthenospheric material. Bahía de Banderas region represents a major tectonic discontinuity, implying the existence of a continental sliver prolonging ~160 km into the San Blas basin north of the bay, the Tres Marías sliver, independent from the Jalisco block, in which crustal fragmentation processes appear to be still in progress. We argue that this sliver is tectonically different from the Jalisco block since at least the late Miocene, when extensional tectonics stretched and thinned its corresponding crust and lithosphere. © 2021 Elsevier B.V.
英文关键词	Electric conductivity; Geomagnetism; Seismology; Structural geology; Topography; Boundary regions; Continental platforms; Crustal thickness; Extensional tectonics; Fragmentation process; Geomagnetic fields; North american plates; Seismic attenuation; Tectonics; asthenosphere; crustal structure; crustal thinning; detachment fault; discontinuity; electrical resistivity; extensional tectonics; gravity survey; lithospheric structure; Miocene; North American plate; plate tectonics; seismic attenuation; seismicity; tectonic setting; topographic effect; Banderas Bay; Mexico [North America]
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207935
作者单位	Instituto de Investigaciones en Matemáticas Aplicadas y en Sistemas, Universidad Nacional Autónoma de México, Ciudad Universitaria, México DF, 04510, Mexico; Centro de Geociencias, CGEO-UNAM, Universidad Nacional Autónoma de México, Blvd. Juriquilla No. 3001, Querétaro, 76230, Mexico; Instituto Potosino de Investigación Científica y Tecnológica, División de Geociencias Aplicadas, Camino a la Presa San José, 2055, San Luis Potosí, 78216, Mexico
推荐引用方式 GB/T 7714	Alvarez R.,Corbo-Camargo F.,Yutsis V.. The great tectonic discontinuity of Bahía de Banderas, Mexico[J],2021,803.
APA	Alvarez R.,Corbo-Camargo F.,&Yutsis V..(2021).The great tectonic discontinuity of Bahía de Banderas, Mexico.Tectonophysics,803.
MLA	Alvarez R.,et al."The great tectonic discontinuity of Bahía de Banderas, Mexico".Tectonophysics 803(2021).