Cross‐Scale Seismic Anisotropy Analysis in Metamorphic Rocks From the COSC‐1 Borehole in the Scandinavian Caledonides
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...
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| Veröffentlicht in: | Journal of geophysical research. Solid earth 2021-05, Vol.126 (5), p.n/a |
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| creator | Kästner, Felix Pierdominici, Simona Zappone, Alba Morales, Luiz F. G. Schleicher, Anja M. Wilke, Franziska D. H. Berndt, Christian |
| description | 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.
Key Points
Integrated study of seismic anisotropy in metamorphic rocks from the COSC‐1 borehole in the Swedish Caledonides
Macroscale anisotropy is driven by major mineral assemblage, while modeled anisotropy dependent on microscale heterogeneity
Results enable to derive facies‐based anisotropy model from core lithology to be compared with field data |
| doi_str_mv | 10.1029/2020JB021154 |
| format | Article |
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Key Points
Integrated study of seismic anisotropy in metamorphic rocks from the COSC‐1 borehole in the Swedish Caledonides
Macroscale anisotropy is driven by major mineral assemblage, while modeled anisotropy dependent on microscale heterogeneity
Results enable to derive facies‐based anisotropy model from core lithology to be compared with field data</description><identifier>ISSN: 2169-9313</identifier><identifier>EISSN: 2169-9356</identifier><identifier>DOI: 10.1029/2020JB021154</identifier><language>eng</language><publisher>Washington: Blackwell Publishing Ltd</publisher><subject>Anisotropy ; Backscatter ; Boreholes ; Composition ; core measurements ; COSC ; Crystallography ; Electron backscatter diffraction ; Geophysics ; Laboratories ; Laboratory experiments ; Lithology ; Metamorphic rocks ; Mineral composition ; Orogeny ; Preferred orientation ; Reflectance ; Seismic activity ; seismic anisotropy</subject><ispartof>Journal of geophysical research. Solid earth, 2021-05, Vol.126 (5), p.n/a</ispartof><rights>2021. The Authors.</rights><rights>2021. This article is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a3681-ec66a6d73bb59c4e5de18efdf8d3f1f653386a40513a9b07f5160c36746060f13</citedby><cites>FETCH-LOGICAL-a3681-ec66a6d73bb59c4e5de18efdf8d3f1f653386a40513a9b07f5160c36746060f13</cites><orcidid>0000-0003-4052-8654 ; 0000-0002-5368-4536 ; 0000-0002-8352-850X ; 0000-0002-3463-6176 ; 0000-0003-0965-7271 ; 0000-0001-5055-0180 ; 0000-0003-4203-5802</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1029%2F2020JB021154$$EPDF$$P50$$Gwiley$$Hfree_for_read</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1029%2F2020JB021154$$EHTML$$P50$$Gwiley$$Hfree_for_read</linktohtml><link.rule.ids>314,780,784,1417,1433,27924,27925,45574,45575,46409,46833</link.rule.ids></links><search><creatorcontrib>Kästner, Felix</creatorcontrib><creatorcontrib>Pierdominici, Simona</creatorcontrib><creatorcontrib>Zappone, Alba</creatorcontrib><creatorcontrib>Morales, Luiz F. G.</creatorcontrib><creatorcontrib>Schleicher, Anja M.</creatorcontrib><creatorcontrib>Wilke, Franziska D. H.</creatorcontrib><creatorcontrib>Berndt, Christian</creatorcontrib><title>Cross‐Scale Seismic Anisotropy Analysis in Metamorphic Rocks From the COSC‐1 Borehole in the Scandinavian Caledonides</title><title>Journal of geophysical research. Solid earth</title><description>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.
Key Points
Integrated study of seismic anisotropy in metamorphic rocks from the COSC‐1 borehole in the Swedish Caledonides
Macroscale anisotropy is driven by major mineral assemblage, while modeled anisotropy dependent on microscale heterogeneity
Results enable to derive facies‐based anisotropy model from core lithology to be compared with field data</description><subject>Anisotropy</subject><subject>Backscatter</subject><subject>Boreholes</subject><subject>Composition</subject><subject>core measurements</subject><subject>COSC</subject><subject>Crystallography</subject><subject>Electron backscatter diffraction</subject><subject>Geophysics</subject><subject>Laboratories</subject><subject>Laboratory experiments</subject><subject>Lithology</subject><subject>Metamorphic rocks</subject><subject>Mineral composition</subject><subject>Orogeny</subject><subject>Preferred orientation</subject><subject>Reflectance</subject><subject>Seismic activity</subject><subject>seismic anisotropy</subject><issn>2169-9313</issn><issn>2169-9356</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><sourceid>24P</sourceid><sourceid>WIN</sourceid><recordid>eNp9kMFOwzAMhiMEEtPYjQeIxJVCnDRZe9wqNpiGJm1wrrI20TLapiQbqDcegWfkScg0hDjhiy3702_7R-gSyA0Qmt5SQslsTCgAj09Qj4JIo5RxcfpbAztHA--3JEQSWhD3UJc56_3Xx-eqkJXCK2V8bQo8aoy3O2fbLpSy6rzx2DT4Ue1kbV27CcjSFi8eT5yt8W6jcLZYZUEG8Ng6tbFBK_CHQRBuStPINyMbnIUlpW1MqfwFOtOy8mrwk_voeXL3lN1H88X0IRvNI8lEApEqhJCiHLL1mqdFrHipIFG61EnJNGjBGUuEjAkHJtM1GWoOghRMDGNBBNHA-ujqqNs6-7pXfpdv7d6Fp3xOOaNAISUkUNdHqjj44ZTOW2dq6bocSH7wN__rb8DZEX83ler-ZfPZdDnmcRIO_AaQj3zt</recordid><startdate>202105</startdate><enddate>202105</enddate><creator>Kästner, Felix</creator><creator>Pierdominici, Simona</creator><creator>Zappone, Alba</creator><creator>Morales, Luiz F. 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Solid earth</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Kästner, Felix</au><au>Pierdominici, Simona</au><au>Zappone, Alba</au><au>Morales, Luiz F. G.</au><au>Schleicher, Anja M.</au><au>Wilke, Franziska D. H.</au><au>Berndt, Christian</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Cross‐Scale Seismic Anisotropy Analysis in Metamorphic Rocks From the COSC‐1 Borehole in the Scandinavian Caledonides</atitle><jtitle>Journal of geophysical research. Solid earth</jtitle><date>2021-05</date><risdate>2021</risdate><volume>126</volume><issue>5</issue><epage>n/a</epage><issn>2169-9313</issn><eissn>2169-9356</eissn><abstract>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.
Key Points
Integrated study of seismic anisotropy in metamorphic rocks from the COSC‐1 borehole in the Swedish Caledonides
Macroscale anisotropy is driven by major mineral assemblage, while modeled anisotropy dependent on microscale heterogeneity
Results enable to derive facies‐based anisotropy model from core lithology to be compared with field data</abstract><cop>Washington</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1029/2020JB021154</doi><tpages>25</tpages><orcidid>https://orcid.org/0000-0003-4052-8654</orcidid><orcidid>https://orcid.org/0000-0002-5368-4536</orcidid><orcidid>https://orcid.org/0000-0002-8352-850X</orcidid><orcidid>https://orcid.org/0000-0002-3463-6176</orcidid><orcidid>https://orcid.org/0000-0003-0965-7271</orcidid><orcidid>https://orcid.org/0000-0001-5055-0180</orcidid><orcidid>https://orcid.org/0000-0003-4203-5802</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Anisotropy Backscatter Boreholes Composition core measurements COSC Crystallography Electron backscatter diffraction Geophysics Laboratories Laboratory experiments Lithology Metamorphic rocks Mineral composition Orogeny Preferred orientation Reflectance Seismic activity seismic anisotropy |
| title | Cross‐Scale Seismic Anisotropy Analysis in Metamorphic Rocks From the COSC‐1 Borehole in the Scandinavian Caledonides |
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