Heat flow and temperature-depth curves throughout Alaska: finding regions for future geothermal exploration

Batir, Joseph; Blackwell, David; Richards, Maria

doi:10.1088/1742-2132/13/3/366

Cited by 25 publications

(45 citation statements)

References 26 publications

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“…The existence of this rigid backstop agrees with our results, with the LAB thermal structure constructed for 3D numerical modeling of Alaska dynamics (Jadamec & Billen, 2010;Jadamec et al 2013) and with the conceptual -escape tectonics‖ scenario of Redfield et al (2007). The 3D thermal structure used with thicker and stronger of Batir et al (2016) they interpret the 75-90 km negative conversion as the LAB (e.g., YTU and YTT of Fig. 9, Profile C).…”

Section: Discussion Of Crustal Structure In Alaska and Adjacent Shelvessupporting

confidence: 88%

“…Similar results have been reported in northern Alaska by Saltus andHudson (2007) andMiller (2015) which can be interpreted as the presence of a cold, strong lithosphere. A cold, strong lithosphere is also supported by the low heat flow values (< 60 mW•m -2 ) reported by Batir et al (2016) (Fig. 3A).…”

Section: Discussion Of Crustal Structure In Alaska and Adjacent Shelvessupporting

confidence: 65%

“…The heat flow map by Batir et al (2016) in central Alaska is based on a very scarce and irregular distribution of thermal gradient measurements combined with the widespread presence of thermal springs, which induced the authors to propose a mantle derived origin for the high heat flow estimates. Nevertheless, the region affected by this high heat flow shows a low topography relative to the bounding Brook Range and the Alaska Range and is affected by deep faulting.…”

Section: Discussion Of Crustal Structure In Alaska and Adjacent Shelvesmentioning

confidence: 99%

“…1). First order efforts to characterize the regional thermal and/or lithospheric structure in Alaska have also been undertaken as a part of geodynamic modeling studies (e.g., Bird 1996;Kalbas et al 2008;Jadamec & Billen 2010;Jadamec et al 2013) based on the varying levels of synthesis of geological and geophysical observations, such as surface heat flow (Batir et al 2016), seismic profiles (Fuis et al 2008), terrane boundaries (Greninger et al 1999), and/or constraints from the thermal models of the Canadian cordillera (Lewis et al 2003).…”

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confidence: 99%

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Regional crustal and lithospheric thickness model for Alaska, the Chukchi shelf, and the inner and outer bering shelves

Torné

Jiménez‐Munt

Vergés

et al. 2019

Geophysical Journal International

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SUMMARY This study presents for the first time an integrated image of the crust and lithospheric mantle of Alaska and its adjacent western shelves of the Chukchi and Bering seas based on joint modelling of potential field data constrained by thermal analysis and seismic data. We also perform 3-D forward modelling and inversion of Bouguer anomalies to analyse density heterogeneities at the crustal level. The obtained crustal model shows northwest-directed long wavelength thickening (32–36 km), with additional localized trends of thicker crust in the Brooks Range (40 km) and in the Alaska and St Elias ranges (50 km). Offshore, 28–30-km-thick crust is predicted near the Bearing slope break and 36–38 km in the northern Chukchi Shelf. In interior Alaska, the crustal thickness changes abruptly across the Denali fault, from 34–36 to the north to above 30 km to the south. This sharp crustal thickness gradient agrees with the presence of a crustal tectonic buttress guiding block motion west and south towards the subduction zone. The average crustal density is 2810 kg m−3. The denser crust, up to 2910 kg m−3, is found south of the Denali Fault likely related to the oceanic nature of the Wrangellia Composite Terrane rocks. Offshore, less dense crust (<2800 kg m−3) is found along the sedimentary basins of the Chukchi and Beaufort shelves. At LAB levels, there is a regional SE–NW trend that coincides with the current Pacific Plate motion, with a lithospheric root underneath the Brooks Range, Northern Slope, and Chuckchi Sea, that may correspond to a relic of the Chukotka-Artic Alaska microplate. The obtained lithospheric root (above 180 km) agrees with the presence of a boundary of cold, strong lithosphere that deflects the strain towards the South. South of the Denali Fault the LAB topography is quite complex. East of 150°W, below Wrangellia and the eastern side of Chugach terranes, the LAB is much shallower than it is west of this meridian. The NW trending limit separating thinner lithosphere in the east and thicker in the west agrees with the two-tiered slab shape of the subducting Pacific Plate.

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Section: Discussion Of Crustal Structure In Alaska and Adjacent Shelvessupporting

confidence: 88%

Section: Discussion Of Crustal Structure In Alaska and Adjacent Shelvessupporting

confidence: 65%

Section: Discussion Of Crustal Structure In Alaska and Adjacent Shelvesmentioning

confidence: 99%

mentioning

confidence: 99%

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Regional crustal and lithospheric thickness model for Alaska, the Chukchi shelf, and the inner and outer bering shelves

Torné

Jiménez‐Munt

Vergés

et al. 2019

Geophysical Journal International

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“…Hot asthenosphere temperatures regionally reach up sufficiently shallow to where they may intersect the wet (damp) mantle solidus. This conclusion is based on heat flow data, upper mantle seismic velocities, mantle xenolith thermobarometry, and a number of other geophysical and recent volcanics geochemical constraints (e.g., Batir et al., 2016; Espinoza Ojeda et al., 2017; Hansen et al., 2015; Hyndman, 2017; Hyndman & Currie, 2011; Hyndman, Currie, & Mazzotti, 2005; Lewis, Bentkowski, & Hyndman, 1992; Lewis, Hyndman, & Flück, 2003; Morgan & Gosnold, 1989; Tesauro et al., 2015). In contrast, there is 200–250‐km‐thick cold lithosphere beneath the cratonic regions and other stable areas (e.g., Canil, 2008; Eaton et al., 2009) (Figure 2).…”

Section: Introductionmentioning

confidence: 99%

Geophysical and Geochemical Constraints on Neogene‐Recent Volcanism in the North American Cordillera

Hyndman

Canil

2021

Geochem Geophys Geosyst

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In this study, we discuss the origin and distribution of the widespread Neogene-Recent volcanism in the North American Cordillera (Figure 1). Although much work has been done on volcanics from the western United States, especially the extensional Basin and Range, current and recent backarc volcanics extend in the Cordillera from Mexico to Alaska, and widely in other global backarcs. We build on previous work that addressed the origin of these volcanic rocks in the Cordillera inland of current and recent Cenozoic subduction (e.g.,

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Guidelines for cold‐regions groundwater numerical modeling

et al. 2020

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The impacts of ongoing climate warming on cold-regions hydrogeology and groundwater resources have created a need to develop groundwater models adapted to these environments. Although permafrost is considered relatively impermeable to groundwater flow, permafrost thaw may result in potential increases in surface water infiltration, groundwater recharge, and hydrogeologic connectivity that can impact northern water resources. To account for these feedbacks, groundwater models that include the dynamic effects of freezing and thawing on ground properties and thermal regimes have been recently developed. However, these models are more complex than traditional hydrogeology numerical models due to the inclusion of nonlinear freeze-thaw processes and complex thermal boundary conditions. As such, their use to date has been limited to a small community of modeling experts. This article aims to provide guidelines and tips on cold-regions groundwater modeling for those with previous modeling experience.

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Heat flow and temperature-depth curves throughout Alaska: finding regions for future geothermal exploration

Cited by 25 publications

References 26 publications

Regional crustal and lithospheric thickness model for Alaska, the Chukchi shelf, and the inner and outer bering shelves

Regional crustal and lithospheric thickness model for Alaska, the Chukchi shelf, and the inner and outer bering shelves

Geophysical and Geochemical Constraints on Neogene‐Recent Volcanism in the North American Cordillera

Guidelines for cold‐regions groundwater numerical modeling

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