COCORP Arizona transect: Strong crustal reflections and offset Moho beneath the transition zone

Hauser, Ernest C.; Gephart, John W.; Latham, T. S.; Oliver, Jack; Kaufman, S.; Brown, L. D.; Lucchitta, Ivo

doi:10.1130/0091-7613(1987)15<1103:catscr>2.0.co;2

Cited by 75 publications

(41 citation statements)

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“…Hauser et al,1987a;Cook et al,1992), while in other cases it is imaged as a diffuse and discontinuous sequences of reflectors, or may even be completely absent (e.g. Brown et al,1986;Hauser et al, 1987b;Hall e al., 1990). Accordingly the Moho may be categorized into the following three types (Fig.6): Type-I Moho is characterized by no clear or only discontinuous reflections (I in Fig.…”

Section: Structural Geometry Of the Reflection Mohomentioning

confidence: 96%

Crustal structure and Moho geometry of the northeastern Tibetan plateau as revealed by SinoProbe-02 deep seismic-reflection profiling

et al. 2014

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Section: Structural Geometry Of the Reflection Mohomentioning

confidence: 96%

Crustal structure and Moho geometry of the northeastern Tibetan plateau as revealed by SinoProbe-02 deep seismic-reflection profiling

et al. 2014

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“…Arizona was interpreted as a late tectonic expression of crustal extension and thinning across this transition zone (Hauser et al, 1987b).…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Crustal versus mantle core complexes

et al. 2018

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Contrary to what is commonly believed, it is argued from analogue and numerical models that detachments that accommodate exhumation of core complexes do not initiate at the onset of extension but in the course of progressive extension when the exhuming ductile crust reaches the surface. In models, convex upward detachments result from a rolling hinge process. A C C E P T E D M A N U S C R I P TMantle core complexes develop in either the oceanic lithosphere, at slow and ultra-slow spreading ridges, or in continental lithospheres, whose initial Moho temperature is lower than 750°C, with "sub-Moho mantle-dominated" strength profiles. It is argued that the mechanism of mantle exhumation at passive margins is a nearly symmetrical necking process at ACCEPTED MANUSCRIPTA C C E P T E D M A N U S C R I P T 2 lithosphere scale without major and permanent detachment, except if strong strain localization could occur in the lithosphere mantle. Distributed crustal extension, by upper crust faulting above a décollement along the ductile crust increases toward the rift axis up to crustal breakup.Mantle rocks exhume in the zone of crustal breakup accommodated by conjugate mantle shear zones that migrate with the rift axis, during increasing extension.

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“…Their argument is based on seismic and gravity evidence that the Moho is presently flat beneath these regions [Allmendinger et al, 1987;Hauser et al, 1987].…”

Section: Implications For Metamorphic Core Complexesmentioning

confidence: 99%

Lithospheric extension near Lake Mead, Nevada: A model for ductile flow in the lower crust

Kruse¹,

McNutt²,

Morgan³

et al. 1991

J. Geophys. Res.

172

117

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Small variations in gravity anomalies and topographic elevation observed in areas that have undergone highly variable amounts of upper crustal thinning can be satisfactorily explained by ductile flow of lower crustal material under the proper conditions. In this study we examine the boundary between the unextended Colorado Plateau and a strongly extended domain in the Basin and Range Province in the Lake Mead (Nevada) region. Bouguer gravity and topography data suggest that both present and preextensional variations in crustal thickness between the unextended and extended regions are small. Analytic channel flow models show that viscosities required for ductile flow in a lower crustal channel to reduce discontinuities in crustal thickness associated with variable amounts of extension are highly d•dent on the channel thickness and on the length scale of flow required. We test these hypotheses in the area around Lake Mead, Nevada, which is a transition zone between highly extended crust of the Basin and Range and the adjacent unextended Colorado Plateau.

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COCORP Arizona transect: Strong crustal reflections and offset Moho beneath the transition zone

Cited by 75 publications

References 0 publications

Crustal structure and Moho geometry of the northeastern Tibetan plateau as revealed by SinoProbe-02 deep seismic-reflection profiling

Crustal structure and Moho geometry of the northeastern Tibetan plateau as revealed by SinoProbe-02 deep seismic-reflection profiling

Crustal versus mantle core complexes

Lithospheric extension near Lake Mead, Nevada: A model for ductile flow in the lower crust

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