GSTDTAP  > 地球科学
DOI10.1038/s41561-019-0523-3
Slab weakening during the olivine to ringwoodite transition in the mantle
Mohiuddin, Anwar; Karato, Shun-ichiro; Girard, Jennifer
2020-01-20
发表期刊NATURE GEOSCIENCE
ISSN1752-0894
EISSN1752-0908
出版年2020
卷号13期号:2页码:170-+
文章类型Article
语种英语
国家USA
英文摘要

The strength of subducted slabs in the mantle transition zone influences the style of mantle convection. Intense deformation is observed particularly in relatively old subducted slabs in the deep mantle transition zone. Understanding the cause of this regional and depth variation in slab deformation requires constraint of the rheological properties of deep mantle materials. Here, we report results of in situ deformation experiments during the olivine to ringwoodite phase transformation, from which we infer the deformation process under the conditions of cold slabs deep in the mantle transition zone. We find that newly transformed fine-grained ringwoodite deforms by diffusion creep and that its strength is substantially smaller than that of coarser-grained minerals but increases with time. Scaling analysis, based on a model of transformation kinetics and grain-size evolution during a phase transformation, suggests that a cold slab will be made of a mixture of weak, fine-grained and strong, coarse-grained materials in the deep transition zone, whereas a warm slab remains strong because of its large grain size. We propose that this temperature dependence of grain size may explain extensive deformation of cold slabs in the deep transition zone but limited deformation of relatively warm slabs.


领域地球科学 ; 气候变化
收录类别SCI-E
WOS记录号WOS:000519214500015
WOS关键词SPINEL TRANSFORMATION ; HIGH-PRESSURE ; EXPERIMENTAL CONSTRAINTS ; DEFORMATION EXPERIMENTS ; PHASE-TRANSFORMATIONS ; PLASTIC-DEFORMATION ; GRAIN-SIZE ; WADSLEYITE ; RHEOLOGY ; KINETICS
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
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文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/249385
专题地球科学
气候变化
作者单位Yale Univ, Dept Geol & Geophys, POB 6666, New Haven, CT 06520 USA
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Mohiuddin, Anwar,Karato, Shun-ichiro,Girard, Jennifer. Slab weakening during the olivine to ringwoodite transition in the mantle[J]. NATURE GEOSCIENCE,2020,13(2):170-+.
APA Mohiuddin, Anwar,Karato, Shun-ichiro,&Girard, Jennifer.(2020).Slab weakening during the olivine to ringwoodite transition in the mantle.NATURE GEOSCIENCE,13(2),170-+.
MLA Mohiuddin, Anwar,et al."Slab weakening during the olivine to ringwoodite transition in the mantle".NATURE GEOSCIENCE 13.2(2020):170-+.
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