Magnetic fabric of Araguainha complex impact structure (Central Brazil): Implications for deformation mechanisms and central uplift formation
The weakening mechanisms involved in the collapse of complex impact craters are controversial. The Araguainha impact crater, in Brazil, exposes a complex structure of 40km in diameter, and is an excellent object to address this issue. Its core is dominated by granite. In addition to microstructural...
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| Veröffentlicht in: | Earth and planetary science letters 2012-05, Vol.331-332, p.347-359 |
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| creator | Yokoyama, E. Trindade, R.I.F. Lana, C. Filho, C.R. Souza Baratoux, D. Marangoni, Y.R. Tohver, E. |
| description | The weakening mechanisms involved in the collapse of complex impact craters are controversial. The Araguainha impact crater, in Brazil, exposes a complex structure of 40km in diameter, and is an excellent object to address this issue. Its core is dominated by granite. In addition to microstructural observations, magnetic studies reveal its internal fabric acquired during the collapse phase. All granite samples exhibit impact-related planar deformation features (PDFs) and planar fractures (PFs), which were overprinted by cataclasis. Cataclastic deformation has evolved from incipient brittle fracturing to the development of discrete shear bands in the center of the structure. Fracture planes are systematically decorated by tiny grains ( |
| doi_str_mv | 10.1016/j.epsl.2012.01.005 |
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► Pervasive cataclasis was recognized in the granitic central uplift of Araguainha. ► Deformation inside the central uplift was mapped through magnetic fabrics. ► Our results indicate that acoustic fluidization could operate at the mineral scale.</description><identifier>ISSN: 0012-821X</identifier><identifier>EISSN: 1385-013X</identifier><identifier>DOI: 10.1016/j.epsl.2012.01.005</identifier><language>eng</language><publisher>Elsevier B.V</publisher><subject>Acoustics ; Araguainha ; Brazil ; Collapse ; complex impact crater ; Craters ; Deformation ; Fabrics ; magnetic anisotropy ; Mathematical models ; microstructures ; Orientation ; weakening mechanism</subject><ispartof>Earth and planetary science letters, 2012-05, Vol.331-332, p.347-359</ispartof><rights>2012 Elsevier B.V.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a400t-4313cd14c1f9f2a89333991b2b5a4ab3f11a0c42a31e1fd19b4eec25abd8d12c3</citedby><cites>FETCH-LOGICAL-a400t-4313cd14c1f9f2a89333991b2b5a4ab3f11a0c42a31e1fd19b4eec25abd8d12c3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S0012821X12000155$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3537,27901,27902,65306</link.rule.ids></links><search><creatorcontrib>Yokoyama, E.</creatorcontrib><creatorcontrib>Trindade, R.I.F.</creatorcontrib><creatorcontrib>Lana, C.</creatorcontrib><creatorcontrib>Filho, C.R. Souza</creatorcontrib><creatorcontrib>Baratoux, D.</creatorcontrib><creatorcontrib>Marangoni, Y.R.</creatorcontrib><creatorcontrib>Tohver, E.</creatorcontrib><title>Magnetic fabric of Araguainha complex impact structure (Central Brazil): Implications for deformation mechanisms and central uplift formation</title><title>Earth and planetary science letters</title><description>The weakening mechanisms involved in the collapse of complex impact craters are controversial. The Araguainha impact crater, in Brazil, exposes a complex structure of 40km in diameter, and is an excellent object to address this issue. Its core is dominated by granite. In addition to microstructural observations, magnetic studies reveal its internal fabric acquired during the collapse phase. All granite samples exhibit impact-related planar deformation features (PDFs) and planar fractures (PFs), which were overprinted by cataclasis. Cataclastic deformation has evolved from incipient brittle fracturing to the development of discrete shear bands in the center of the structure. Fracture planes are systematically decorated by tiny grains (<10μm) of magnetite and hematite, and the orientation of magnetic lineation and magnetic foliation obtained by the anisotropies of magnetic susceptibility (AMS) and anhysteretic remanence (AAR) are perfectly coaxial in all studied sites. Therefore, we could track the orientation of deformation features which are decorated by iron oxides using the AMS and AAR. The magnetic fabrics show a regular pattern at the borders of the central peak, with orientations consistent with the fabric of sediments at the crater's inner collar and complex in the center of the structure. Both the cataclastic flow revealed from microstructural observations and the structural pattern of the magnetic anisotropy match the predictions from numerical models of complex impact structures. The widespread occurrence of cataclasis in the central peak, and its orientations revealed by magnetic studies indicate that acoustic fluidization likely operates at all scales, including the mineral scales. The cataclastic flow made possible by acoustic fluidization results in an apparent plastic deformation at the macroscopic scale in the core.
► Pervasive cataclasis was recognized in the granitic central uplift of Araguainha. ► Deformation inside the central uplift was mapped through magnetic fabrics. ► Our results indicate that acoustic fluidization could operate at the mineral scale.</description><subject>Acoustics</subject><subject>Araguainha</subject><subject>Brazil</subject><subject>Collapse</subject><subject>complex impact crater</subject><subject>Craters</subject><subject>Deformation</subject><subject>Fabrics</subject><subject>magnetic anisotropy</subject><subject>Mathematical models</subject><subject>microstructures</subject><subject>Orientation</subject><subject>weakening mechanism</subject><issn>0012-821X</issn><issn>1385-013X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><recordid>eNp9kE1vFDEMhiNEJZaWP8Apx3KYIU5mtjOIS1nxUamoF5B6izwep81qvkgyFfAf-p_JshVHLrZkv48lP0K8BlWCgu3bfclLHEqtQJcKSqXqZ2IDpqkLBeb2udiovCkaDbcvxMsY90qpbb1tN-LxK95NnDxJh13IbXbyMuDdin66R0nzuAz8U_pxQUoyprBSWgPL8x1PKeAgPwT87Yc37-RVTnrC5OcpSjcH2XOu49-BHJnucfJxjBKnXtITvGbEJfkvdyZOHA6RXz31U_H908dvuy_F9c3nq93ldYGVUqmoDBjqoSJwrdPYtMaYtoVOdzVW2BkHgIoqjQYYXA9tVzGTrrHrmx40mVNxfry7hPnHyjHZ0UfiYcCJ5zVa2F6ArlRTX-SoPkYpzDEGdnYJfsTwy4KyB_d2bw_u7cG9VWCz-wy9P0Kcn3jwHGwkzxNx7wNTsv3s_4f_AcK7kOs</recordid><startdate>20120515</startdate><enddate>20120515</enddate><creator>Yokoyama, E.</creator><creator>Trindade, R.I.F.</creator><creator>Lana, C.</creator><creator>Filho, C.R. Souza</creator><creator>Baratoux, D.</creator><creator>Marangoni, Y.R.</creator><creator>Tohver, E.</creator><general>Elsevier B.V</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope></search><sort><creationdate>20120515</creationdate><title>Magnetic fabric of Araguainha complex impact structure (Central Brazil): Implications for deformation mechanisms and central uplift formation</title><author>Yokoyama, E. ; Trindade, R.I.F. ; Lana, C. ; Filho, C.R. Souza ; Baratoux, D. ; Marangoni, Y.R. ; Tohver, E.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a400t-4313cd14c1f9f2a89333991b2b5a4ab3f11a0c42a31e1fd19b4eec25abd8d12c3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2012</creationdate><topic>Acoustics</topic><topic>Araguainha</topic><topic>Brazil</topic><topic>Collapse</topic><topic>complex impact crater</topic><topic>Craters</topic><topic>Deformation</topic><topic>Fabrics</topic><topic>magnetic anisotropy</topic><topic>Mathematical models</topic><topic>microstructures</topic><topic>Orientation</topic><topic>weakening mechanism</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Yokoyama, E.</creatorcontrib><creatorcontrib>Trindade, R.I.F.</creatorcontrib><creatorcontrib>Lana, C.</creatorcontrib><creatorcontrib>Filho, C.R. 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Souza</au><au>Baratoux, D.</au><au>Marangoni, Y.R.</au><au>Tohver, E.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Magnetic fabric of Araguainha complex impact structure (Central Brazil): Implications for deformation mechanisms and central uplift formation</atitle><jtitle>Earth and planetary science letters</jtitle><date>2012-05-15</date><risdate>2012</risdate><volume>331-332</volume><spage>347</spage><epage>359</epage><pages>347-359</pages><issn>0012-821X</issn><eissn>1385-013X</eissn><abstract>The weakening mechanisms involved in the collapse of complex impact craters are controversial. The Araguainha impact crater, in Brazil, exposes a complex structure of 40km in diameter, and is an excellent object to address this issue. Its core is dominated by granite. In addition to microstructural observations, magnetic studies reveal its internal fabric acquired during the collapse phase. All granite samples exhibit impact-related planar deformation features (PDFs) and planar fractures (PFs), which were overprinted by cataclasis. Cataclastic deformation has evolved from incipient brittle fracturing to the development of discrete shear bands in the center of the structure. Fracture planes are systematically decorated by tiny grains (<10μm) of magnetite and hematite, and the orientation of magnetic lineation and magnetic foliation obtained by the anisotropies of magnetic susceptibility (AMS) and anhysteretic remanence (AAR) are perfectly coaxial in all studied sites. Therefore, we could track the orientation of deformation features which are decorated by iron oxides using the AMS and AAR. The magnetic fabrics show a regular pattern at the borders of the central peak, with orientations consistent with the fabric of sediments at the crater's inner collar and complex in the center of the structure. Both the cataclastic flow revealed from microstructural observations and the structural pattern of the magnetic anisotropy match the predictions from numerical models of complex impact structures. The widespread occurrence of cataclasis in the central peak, and its orientations revealed by magnetic studies indicate that acoustic fluidization likely operates at all scales, including the mineral scales. The cataclastic flow made possible by acoustic fluidization results in an apparent plastic deformation at the macroscopic scale in the core.
► Pervasive cataclasis was recognized in the granitic central uplift of Araguainha. ► Deformation inside the central uplift was mapped through magnetic fabrics. ► Our results indicate that acoustic fluidization could operate at the mineral scale.</abstract><pub>Elsevier B.V</pub><doi>10.1016/j.epsl.2012.01.005</doi><tpages>13</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | Acoustics Araguainha Brazil Collapse complex impact crater Craters Deformation Fabrics magnetic anisotropy Mathematical models microstructures Orientation weakening mechanism |
| title | Magnetic fabric of Araguainha complex impact structure (Central Brazil): Implications for deformation mechanisms and central uplift formation |
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