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DOI | 10.1002/2017GL073836 |
The recrystallized grain size piezometer for quartz: An EBSD-based calibration | |
Cross, A. J.1; Prior, D. J.2; Stipp, M.3; Kidder, S.4 | |
2017-07-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:13 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; New Zealand; Austria |
英文摘要 | We have reanalyzed samples previously used for a quartz recrystallized grain size paleopiezometer, using electron backscatter diffraction (EBSD). Recrystallized and relict grains are separated using their grain orientation spread, which acts as a measure of intragranular lattice distortion and a proxy for dislocation density. For EBSD maps made with a 1 mu m step size, the piezometer relationship is D= 10(3.91 +/- 0.41) . sigma (1.41 +/- 0.21) (for root-mean-square mean diameter values). We also present a " sliding resolution" piezometer relationship, D = 10(4.22 +/- 0.51) sigma (1.59 +/- 0.26,) that combines 1 mu m step size data at coarser grain sizes with 200 nm step size data at finer grain sizes. The sliding resolution piezometer more accurately estimates stress in fine-grained (< 10 mu m) samples. The two calibrations give results within 10% of each other for recrystallized grain sizes between 10 mu m and 100 mu m. Both piezometers match the original light optical microscopy quartz piezometer within error. Plain Language Summary Constraining stress magnitudes imposed during the high-temperature creep of rocks in the lithosphere is crucial to our understanding of tectonics. Stress magnitudes can be constrained by their inverse relationship with recrystallized grain size: a method known as paleopiezometry. Quantitative microstructural analysis of deformed rocks is now routinely carried out using electron backscatter diffraction (EBSD): a scanning electron microscope technique. We outline a procedure for quantifying mean recrystallized grain size from EBSD data and provide the first EBSD-based paleopiezometer calibration, in this case for quartz. Our empirical piezometer calibration can be used to robustly quantify stress magnitudes driving quartz deformation at the time of recrystallization. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000406257400023 |
WOS关键词 | ELECTRON BACKSCATTER DIFFRACTION ; ALPINE FAULT ZONE ; DYNAMIC RECRYSTALLIZATION ; DISLOCATION DENSITIES ; DEFORMATION ; ORIENTATION ; MICROSTRUCTURES ; ROCKS ; 2D ; PALEOPIEZOMETRY |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
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/28552 |
专题 | 气候变化 |
作者单位 | 1.Washington Univ, Dept Earth & Planetary Sci, St Louis, MO 63130 USA; 2.Univ Otago, Dept Geol, Dunedin, New Zealand; 3.Univ Innsbruck, Inst Geol, Innsbruck, Austria; 4.CUNY City Coll, Dept Earth & Atmospher Sci, New York, NY USA |
推荐引用方式 GB/T 7714 | Cross, A. J.,Prior, D. J.,Stipp, M.,et al. The recrystallized grain size piezometer for quartz: An EBSD-based calibration[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(13). |
APA | Cross, A. J.,Prior, D. J.,Stipp, M.,&Kidder, S..(2017).The recrystallized grain size piezometer for quartz: An EBSD-based calibration.GEOPHYSICAL RESEARCH LETTERS,44(13). |
MLA | Cross, A. J.,et al."The recrystallized grain size piezometer for quartz: An EBSD-based calibration".GEOPHYSICAL RESEARCH LETTERS 44.13(2017). |
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