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DOI | 10.1073/pnas.1809962115 |
Shear heating reconciles thermal models with the metamorphic rock record of subduction | |
Kohn, Matthew J.1; Castro, Adrian E.2; Kerswell, Buchanan C.1; Ranero, Cesar R.3,4; Spear, Frank S.2 | |
2018-11-13 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
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ISSN | 0027-8424 |
出版年 | 2018 |
卷号 | 115期号:46页码:11706-11711 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Spain |
英文摘要 | Some commonly referenced thermal-mechanical models of current subduction zones imply temperatures that are 100-500 degrees 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. |
英文关键词 | subduction heat flow thermal modeling metamorphism P-T paths |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000449934400034 |
WOS关键词 | HYDROTHERMAL CIRCULATION ; DEHYDRATION REACTIONS ; PLATE BOUNDARY ; OCEANIC-CRUST ; FORE-ARCS ; ZONE ; FLOW ; TEMPERATURES ; MANTLE ; FLUID |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/205012 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Boise State Univ, Dept Geosci, Boise, ID 83725 USA; 2.Rensselaer Polytech Inst, Dept Earth & Environm Sci, Troy, NY 12180 USA; 3.Spanish Natl Res Council, Inst Ciencias Mar, Barcelona 08003, Spain; 4.Inst Catalana Recerca & Estudis Avancats, Barcelona 08010, Spain |
推荐引用方式 GB/T 7714 | Kohn, Matthew J.,Castro, Adrian E.,Kerswell, Buchanan C.,et al. Shear heating reconciles thermal models with the metamorphic rock record of subduction[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2018,115(46):11706-11711. |
APA | Kohn, Matthew J.,Castro, Adrian E.,Kerswell, Buchanan C.,Ranero, Cesar R.,&Spear, Frank S..(2018).Shear heating reconciles thermal models with the metamorphic rock record of subduction.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,115(46),11706-11711. |
MLA | Kohn, Matthew J.,et al."Shear heating reconciles thermal models with the metamorphic rock record of subduction".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 115.46(2018):11706-11711. |
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