Thermal gradients in the continental crust

Chapman, David S.

doi:10.1144/gsl.sp.1986.024.01.07

Cited by 307 publications

(207 citation statements)

References 16 publications

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“…One caveat of this approach is that material properties are not exhumed during the simulations to modify the surface heat production value. However, an exponential decrease in heat production with depth has the advantage of honoring observations that heat production diminishes with depth through the crust and that this decline is not monotonic (Chapman, 1986;Ketcham, 1996;Brady et al, 2006). This approach not only allows for the matching of measured surface values of heat production in the Himalaya (e.g., Whipp et al, 2007), but also produces reasonable middle and lower crustal temperatures that would not produce partial melts.…”

Section: Radiogenic Heat Productionmentioning

confidence: 96%

Testing the effects of topography, geometry, and kinematics on modeled thermochronometer cooling ages in the eastern Bhutan Himalaya

et al. 2018

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Abstract. In this study, reconstructions of a balanced geologic cross section in the Himalayan fold-thrust belt of eastern Bhutan are used in flexural-kinematic and thermokinematic models to understand the sensitivity of predicted cooling ages to changes in fault kinematics, geometry, topography, and radiogenic heat production. The kinematics for each scenario are created by sequentially deforming the cross section with ∼ 10 km deformation steps while applying flexural loading and erosional unloading at each step to develop a high-resolution evolution of deformation, erosion, and burial over time. By assigning ages to each increment of displacement, we create a suite of modeled scenarios that are input into a 2-D thermokinematic model to predict cooling ages. Comparison of model-predicted cooling ages to published thermochronometer data reveals that cooling ages are most sensitive to (1) the location and size of fault ramps, (2) the variable shortening rates between 68 and 6.4 mm yr −1 , and (3) the timing and magnitude of out-of-sequence faulting. The predicted ages are less sensitive to (4) radiogenic heat production and (5) estimates of topographic evolution. We used the observed misfit of predicted to measured cooling ages to revise the cross section geometry and separate one large ramp previously proposed for the modern décollement into two smaller ramps. The revised geometry results in an improved fit to observed ages, particularly young AFT ages (2-6 Ma) located north of the Main Central Thrust. This study presents a successful approach for using thermochronometer data to test the viability of a proposed cross section geometry and kinematics and describes a viable approach to estimating the first-order topographic evolution of a compressional orogen.

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Section: Radiogenic Heat Productionmentioning

confidence: 96%

Testing the effects of topography, geometry, and kinematics on modeled thermochronometer cooling ages in the eastern Bhutan Himalaya

et al. 2018

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“…Thermal analysis of sedimentary basins is important not only for its direct applicability to hydrocarbon maturation studies , but also for the information it provides on the thermal state of the lithosphere as a whole (Chapman 1986).…”

Section: Rationalementioning

confidence: 99%

Heat flow through the West Coast, South Island, New Zealand

Townend

1999

New Zealand Journal of Geology and Geophysics

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2 exist in the Lake Brunner region and at the sites of Card Creek-1 and Matiri-1 wells. Convective effects caused by fluid migration along structural features in these three areas may be responsible for the highly elevated local heat flows. However, calculations of the thermal effects of late Neogene erosion in the southern Taranaki and West Coast regions suggest that the present-day discrepancy in surface heat flows may be largely due to differing magnitudes and rates of erosion.

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“…We account for the dependence of k on pressure and temperature. We have used a depth (pressure)-temperature correction by Chapman and Furlong (1992). Mantle k is 2.8 W/mK from Hyndman and Lewis (1999).…”

Section: Temperaturementioning

confidence: 99%

The geophysical characteristic of the lower lithosphere and asthenosphere in the marginal zone of the East European Craton

Grad

Puziewicz

Majorowicz³

et al. 2018

Int J Earth Sci (Geol Rundsch)

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Seismic P-and S-wave velocities of the lower lithosphere and underlying asthenosphere at the SW margin of the East European Craton in northern Poland were obtained with different seismic techniques: seismic refraction, P-residuals of the first arrivals from teleseismic earthquakes, P-wave receiver function, and inversion of the Rayleigh surface wave dispersion curves, the last two using data collected in the passive seismic experiment "13 BB star". The uniform array consisted of 13 stations deployed in a 120 km in diameter area. Below the depth of 180-220 km a decrease of about 6% of the S-wave velocity is interpreted as a thermal gradient zone corresponding to a lithosphere-asthenosphere transition. The average mantle velocities down to a depth of 300 km beneath the array are relatively high, exceeding values for other Precambrian cratons by 0.1-0.2 km/s, and cannot be modeled by reasonable mantle peridotite compositions in the lithospheric part of the profile. We suggest that significant peridotite anisotropy could explain the misfit between measured and calculated seismic velocities in the lithosphere.

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Thermal gradients in the continental crust

Cited by 307 publications

References 16 publications

Testing the effects of topography, geometry, and kinematics on modeled thermochronometer cooling ages in the eastern Bhutan Himalaya

Testing the effects of topography, geometry, and kinematics on modeled thermochronometer cooling ages in the eastern Bhutan Himalaya

Heat flow through the West Coast, South Island, New Zealand

The geophysical characteristic of the lower lithosphere and asthenosphere in the marginal zone of the East European Craton

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