Thermoelastic modeling of lithospheric uplift:

Hinojosa, Juan Homero; Mickus, Kevin L.

doi:10.1016/s0098-3004(01)00028-0

Cited by 13 publications

(8 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To evaluate the role of heat production in southern Madagascar, we use a 2‐D transient heat flow model based on the alternating direction, implicit, finite‐difference method described by Hinojosa and Mickus []. The model is a 350 × 150 km rectangular grid with 2 km node spacing.…”

Section: Thermal Modelingmentioning

confidence: 99%

Focused radiogenic heating of middle crust caused ultrahigh temperatures in southern Madagascar

et al. 2016

View full text Add to dashboard Cite

Internal heating can cause melting, metamorphism, and crustal weakening in convergent orogens.This study evaluates the role of radiogenic heat production (RHP) in a Neoproterozoic ultrahigh-temperature metamorphic (UHTM) terrane exposed in southern Madagascar. Monazite and zircon geochronology indicates that the Paleoproterozoic Androyen and Anosyen domains (i) collided with the oceanic Vohibory Arc at~630 Ma, (ii) became incorporated into the Gondwanan collisional orogen by~580 Ma, and (iii) were exhumed during crustal thinning at 525-510 Ma. Ti-in-quartz and Zr-in-rutile thermometry reveals that UHTM occurred over >20,000 km 2 , mostly within the Anosyen domain. Assuming that U, Th, and K contents of samples from the field area are representative of the middle to lower crust during orogenesis, RHP was high enough-locally >5 μW/m 3 -to cause regional UHTM in <60 Myr. We conclude that, due in large part to the stability and insolubility of monazite at high crustal temperatures, RHP was the principal heat source responsible for UHTM, obviating the need to evoke external heat sources. Focused RHP probably thermally weakened portions of the middle crust, gravitationally destabilizing the orogen and facilitating thinning via lateral extrusion of hot crustal sections.

show abstract

Section: Thermal Modelingmentioning

confidence: 99%

Focused radiogenic heating of middle crust caused ultrahigh temperatures in southern Madagascar

et al. 2016

View full text Add to dashboard Cite

show abstract

“…Equally controversial is the mechanism for the uplift of the CP. Some of the proposed models include various crustal thickening models involving the flat subduction of the Farallon plate [ Bird , 1984, 1988; Chase et al , 2002], thermal heating of the lithosphere [ Hinojosa and Mickus , 2002], delimination of a part or all of the mantle lithosphere [ Bird , 1979; England and Houseman , 1988; Zandt et al , 1995; Spencer , 1996; McQuarrie and Chase , 2000], chemical alteration of the lithosphere and removal of the Farallon plate [ Humphreys et al , 2003; Roy et al , 2004], mantle convection [ Liu and Gurnis , 2010], and buoyancy from a lower velocity channel in the depth range of 150 to 300 km [ West et al , 2004].…”

Section: Tectonic Settingmentioning

confidence: 99%

Crustal structure and evolution beneath the Colorado Plateau and the southern Basin and Range Province: Results from receiver function and gravity studies

Bashir

Gao

Liu

et al. 2011

Geochem. Geophys. Geosyst.

View full text Add to dashboard Cite

[1] Over the past several decades, contrasting models have been proposed for the physical and chemical processes responsible for the uplift and long-term stability of the Colorado Plateau (CP) and crustal thinning beneath the Basin and Range Province (BRP) in the southwestern United States. Here we provide new constraints on the models by modeling gravity anomalies and by systematically analyzing over 15,500 P-to-S receiver functions recorded at 72 USArray and other broadband seismic stations on the southwestern CP and the southern BRP. Our results reveal that the BRP is characterized by a thin crust (28.2 ± 0.5 km), a mean V p /V s of 1.761 ± 0.014 and a mean amplitude (R) of P-to-S converted wave (relative to that of the direct P wave) of 0.181 ± 0.014 that are similar to a typical continental crust, consistent with the model that the thin crust was the consequence of lithospheric stretching during the Cenozoic. The CP is characterized by the thickest crust (42.3 ± 0.8 km), largest V p /V s (1.825 ± 0.009) and smallest R (0.105 ± 0.007) values in the study area. In addition, many stations on the CP exhibit a clear arrival before the P-to-S converted phase from the Moho, corresponding to a lower crustal layer of about 12 km thick with a mafic composition. We hypothesize that the lower crustal layer, which has an anomalously large density as revealed by gravity modeling and high velocities in seismic refraction lines, contributed to the long-term stability and preuplift low elevation of the Colorado Plateau.

show abstract

“…In addition, the Colorado Plateau, again similar to the NPM, was affected by basaltic volcanism that erupted from the top of the plateau to the lower elevated areas in its surroundings after the uplift. Supported by a far larger amount of geophysical data, the Colorado Plateau is interpreted to have a thicker crust with respect to the surrounding B&R crust (43-49 km; Keller et al 1979;McQuarrie and Chase 2000;Sheehan et al 1997;Zandt et al 1995), a pronounced low velocity zone in mantle below the southern portion of the plateau (Levander et al 2011) and elevated temperatures (Hinojosa and Mickus 2002;Levandowski et al 2018;Reiter et al 1979;Roy et al 2009). These similarities with the NPM plateau point to a similar origin and similar mechanisms at work maintaining their respective elevations.…”

Section: Transient Thermal Fieldmentioning

confidence: 96%

Unravelling the lithospheric-scale thermal field of the North Patagonian Massif plateau (Argentina) and its relations to the topographic evolution of the area

Dacal

Scheck‐Wenderoth

Aragón

et al. 2020

Int J Earth Sci (Geol Rundsch)

View full text Add to dashboard Cite

The North Patagonian Massif (NPM) area in Argentina includes a plateau of 1200 m a.s.l. (meters above sea level) average height, which is 500–700 m higher than its surrounding areas. The plateau shows no evidence of internal deformation, while the surrounding basins have been deformed during Cenozoic orogenic events. Previous works suggested that the plateau formation was caused by a lithospheric uplift event during the Paleogene. However, the causative processes responsible for the plateau origin and its current state remain speculative. To address some of these questions, we carried out 3D lithospheric-scale steady-state and transient thermal simulations of the NPM and its surroundings, as based on an existing 3D geological model of the area. Our results are indicative of a thicker and warmer lithosphere below the NPM plateau compared with its surroundings, suggesting that the plateau is still isostatically buoyant and thus explaining its present-day elevation. The transient thermal simulations agree with a heating event in the mantle during the Paleogene as the causative process leading to lithospheric uplift in the region and indicate that the thermo-mechanical effects of such an event would still be influencing the plateau evolution today. Although the elevation related to the heating would not be enough to reach the present plateau topography, we discuss other mechanisms, also connected with the mantle heating, that may have caused the observed relief. Lithosphere cooling in the plateau is ongoing, being delayed by the presence of a thick crust enriched in radiogenic minerals as compared to its sides, resulting in a thermal configuration that has yet to reach thermodynamic equilibrium.

show abstract

Thermoelastic modeling of lithospheric uplift:

Cited by 13 publications

References 23 publications

Focused radiogenic heating of middle crust caused ultrahigh temperatures in southern Madagascar

Focused radiogenic heating of middle crust caused ultrahigh temperatures in southern Madagascar

Crustal structure and evolution beneath the Colorado Plateau and the southern Basin and Range Province: Results from receiver function and gravity studies

Unravelling the lithospheric-scale thermal field of the North Patagonian Massif plateau (Argentina) and its relations to the topographic evolution of the area

Contact Info

Product

Resources

About