scholarly journals Heat flow bounds over the Cascadia margin derived from bottom simulating reflectors and implications for thermal models of subduction

2017 ◽  
Vol 18 (9) ◽  
pp. 3309-3326 ◽  
Author(s):  
Benjamin J. Phrampus ◽  
Robert N. Harris ◽  
Anne M. Tréhu
Keyword(s):  
Heat Flow ◽  
Thermal Models ◽  
Bottom Simulating Reflectors ◽  
Cascadia Margin

Heat flow variations from bottom simulating reflectors on the Cascadia margin

2000 ◽  
Vol 164 (1-2) ◽  
pp. 53-68 ◽  
Author(s):  
N Ganguly ◽  
G.D Spence ◽  
N.R Chapman ◽  
R.D Hyndman
Keyword(s):  
Heat Flow ◽  
Bottom Simulating Reflectors ◽  
Cascadia Margin ◽  
Heat Flow Variations

Steady-state and dynamic thermal models for heat flow analysis of silicon-on-insulator MOSFETs

2004 ◽  
Vol 44 (3) ◽  
pp. 381-396 ◽  
Author(s):  
Ming-C. Cheng ◽  
Feixia Yu ◽  
Lin Jun ◽  
Min Shen ◽  
Goodarz Ahmadi
Keyword(s):  
Steady State ◽  
Heat Flow ◽  
Flow Analysis ◽  
Silicon On Insulator ◽  
Thermal Models

scholarly journals Heat Flow Measurements over Bottom Simulating Reflectors, Offshore Southwestern Taiwan

2006 ◽  
Vol 17 (4) ◽  
pp. 845 ◽  
Author(s):  
Chuen-Tien Shyu ◽  
Yu-Jhong Chen ◽  
Shaye-Tang Chiang ◽  
Char-Shine Liu
Keyword(s):  
Heat Flow ◽  
Flow Measurements ◽  
Bottom Simulating Reflectors ◽  
Southwestern Taiwan

scholarly journals Thermal regime of the Costa Rican convergent margin: 1. Along-strike variations in heat flow from probe measurements and estimated from bottom-simulating reflectors

2010 ◽  
Vol 11 (12) ◽  
pp. n/a-n/a ◽  
Author(s):  
Robert N. Harris ◽  
Ingo Grevemeyer ◽  
César R. Ranero ◽  
Heinrich Villinger ◽  
Udo Barckhausen ◽  
...  
Keyword(s):  
Heat Flow ◽  
Thermal Regime ◽  
Costa Rican ◽  
Convergent Margin ◽  
Bottom Simulating Reflectors ◽  
Probe Measurements

scholarly journals Shear heating reconciles thermal models with the metamorphic rock record of subduction

2018 ◽  
Vol 115 (46) ◽  
pp. 11706-11711 ◽  
Author(s):  
Matthew J. Kohn ◽  
Adrian E. Castro ◽  
Buchanan C. Kerswell ◽  
César R. Ranero ◽  
Frank S. Spear
Keyword(s):  
Heat Flow ◽  
Subduction Zones ◽  
Thermal Structure ◽  
Metamorphic Rocks ◽  
Shear Stresses ◽  
Thermal Models ◽  
Average Value ◽  
Temperature Conditions ◽  
Mechanical Models ◽  
Shear Heating

Some commonly referenced thermal-mechanical models of current subduction zones imply temperatures that are 100–500 °C colder at 30–80-km depth than pressure–temperature conditions determined thermobarometrically from exhumed metamorphic rocks. Accurately inferring subduction zone thermal structure, whether from models or rocks, is crucial for predicting metamorphic reactions and associated fluid release, subarc melting conditions, rheologies, and fault-slip phenomena. Here, we compile surface heat flow data from subduction zones worldwide and show that values are higher than can be explained for a frictionless subduction interface often assumed for modeling. An additional heat source––likely shear heating––is required to explain these forearc heat flow values. A friction coefficient of at least 0.03 and possibly as high as 0.1 in some cases explains these data, and we recommend a provisional average value of 0.05 ± 0.015 for modeling. Even small coefficients of friction can contribute several hundred degrees of heating at depths of 30–80 km. Adding such shear stresses to thermal models quantitatively reproduces the pressure–temperature conditions recorded by exhumed metamorphic rocks. Comparatively higher temperatures generally drive rock dehydration and densification, so, at a given depth, hotter rocks are denser than colder rocks, and harder to exhume through buoyancy mechanisms. Consequently––conversely to previous proposals––exhumed metamorphic rocks might overrepresent old-cold subduction where rocks at the slab interface are wetter and more buoyant than in young-hot subduction zones.

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