DOI: 10.1016/j.tecto.2021.228762
论文题名: The great tectonic discontinuity of Bahía de Banderas, Mexico
作者: Alvarez R. ; Corbo-Camargo F. ; Yutsis V.
刊名: Tectonophysics
ISSN: 00401951
出版年: 2021
卷: 803 语种: 英语
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]
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170768
Appears in Collections: 气候变化与战略
There are no files associated with this item.
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
Recommended Citation:
Alvarez R.,Corbo-Camargo F.,Yutsis V.. The great tectonic discontinuity of Bahía de Banderas, Mexico[J]. Tectonophysics,2021-01-01,803