气候变化领域集成服务门户(CCPortal): Cross-Scale Seismic Anisotropy Analysis in Metamorphic Rocks From the COSC-1 Borehole in the Scandinavian Caledonides

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DOI	10.1029/2020JB021154
	Cross-Scale Seismic Anisotropy Analysis in Metamorphic Rocks From the COSC-1 Borehole in the Scandinavian Caledonides
	Kästner F.; Pierdominici S.; Zappone A.; Morales L.F.G.; Schleicher A.M.; Wilke F.D.H.; Berndt C.
发表日期	2021
ISSN	21699313
卷号	126 期号:5
英文摘要	Metamorphic and deformed rocks in thrust zones show particularly high seismic anisotropy causing challenges for seismic imaging and interpretation. A good example is the Seve Nappe Complex in central Sweden, an old exhumed orogenic thrust zone that is characterized by a strong but incoherent seismic reflectivity and considerable seismic anisotropy. However, only little is known about their origin in relation to composition and structural influences on measurements at different seismic scales. Here, we present a new integrative study of cross-scale seismic anisotropy analyses combining mineralogical composition, microstructural analyses, and seismic laboratory experiments from the COSC-1 borehole, which sampled a 2.5-km-deep section of metamorphic rocks deformed in an orogenic root now preserved in the Lower Seve Nappe. While there is strong crystallographic preferred orientation in most samples in general, variations in anisotropy depend mostly on bulk mineral composition and dominant core lithology as shown by a strong correlation between these. This relationship enables to identify three distinct seismic anisotropy facies providing a continuous anisotropy profile along the borehole. Moreover, comparison of laboratory seismic measurements and electron-backscatter diffraction data reveals a strong scale dependence, which is more pronounced in the highly deformed, heterogeneous samples. This highlights the need for comprehensive cross-validation of microscale anisotropy analyses with additional lithological data when integrating seismic anisotropy over seismic scales. © 2021. The Authors.
英文关键词	core measurements; COSC; electron-backscatter diffraction; seismic anisotropy
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187168
作者单位	Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Potsdam, Germany; GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany; Department of Earth Sciences, ETH Zürich, Zurich, Switzerland; Department of Mechanical and Process Engineering, ETH Zürich, Zurich, Switzerland; Scientific Center for Optical and Electron Microscopy (ScopeM), ETH Zürich, Zurich, Switzerland
推荐引用方式 GB/T 7714	Kästner F.,Pierdominici S.,Zappone A.,et al. Cross-Scale Seismic Anisotropy Analysis in Metamorphic Rocks From the COSC-1 Borehole in the Scandinavian Caledonides[J],2021,126(5).
APA	Kästner F..,Pierdominici S..,Zappone A..,Morales L.F.G..,Schleicher A.M..,...&Berndt C..(2021).Cross-Scale Seismic Anisotropy Analysis in Metamorphic Rocks From the COSC-1 Borehole in the Scandinavian Caledonides.Journal of Geophysical Research: Solid Earth,126(5).
MLA	Kästner F.,et al."Cross-Scale Seismic Anisotropy Analysis in Metamorphic Rocks From the COSC-1 Borehole in the Scandinavian Caledonides".Journal of Geophysical Research: Solid Earth 126.5(2021).