An interdisciplinary investigation of a recent submarine mass transport deposit at the continental margin off Uruguay
Assessing frequency and extent of mass movement at continental margins is crucial to evaluate risks for offshore constructions and coastal areas. A multidisciplinary approach including geophysical, sedimentological, geotechnical, and geochemical methods was applied to investigate multistage mass tra...
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| creator | Henkel, Susann Strasser, Michael Schwenk, Tilmann Hanebuth, Till J. J. Hüsener, Johannes Arnold, Gail L. Winkelmann, Daniel Formolo, Michael Tomasini, Juan Krastel, Sebastian Kasten, Sabine |
| description | Assessing frequency and extent of mass movement at continental margins is crucial to evaluate risks for offshore constructions and coastal areas. A multidisciplinary approach including geophysical, sedimentological, geotechnical, and geochemical methods was applied to investigate multistage mass transport deposits (MTDs) off Uruguay, on top of which no surficial hemipelagic drape was detected based on echosounder data. Nonsteady state pore water conditions are evidenced by a distinct gradient change in the sulfate (SO42−) profile at 2.8 m depth. A sharp sedimentological contact at 2.43 m coincides with an abrupt downward increase in shear strength from ∼10 to >20 kPa. This boundary is interpreted as a paleosurface (and top of an older MTD) that has recently been covered by a sediment package during a younger landslide event. This youngest MTD supposedly originated from an upslope position and carried its initial pore water signature downward. The kink in the SO42− profile ∼35 cm below the sedimentological and geotechnical contact indicates that bioirrigation affected the paleosurface before deposition of the youngest MTD. Based on modeling of the diffusive re‐equilibration of SO42− the age of the most recent MTD is estimated to be |
| doi_str_mv | 10.1029/2011GC003669 |
| format | Article |
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Key Points
Pore water profiles can be used to identify and date recent mass transport deposits
Multidisciplinary studies are needed to assess the complexity of slide deposits
Recent slope failure off Uruguay might be related to an earthquake in 1988</description><identifier>ISSN: 1525-2027</identifier><identifier>EISSN: 1525-2027</identifier><identifier>DOI: 10.1029/2011GC003669</identifier><language>eng</language><publisher>Washington: Blackwell Publishing Ltd</publisher><subject>Biogeochemistry ; Coastal zone ; Contact ; continental margin ; Continental margins ; Deposition ; Earthquakes ; Echosounders ; Failure ; Geobiology ; Geophysics ; Landslides ; Marine geology ; Mass transport ; Multidisciplinary ; Multidisciplinary research ; Pore water ; pore water geochemistry ; Porosity ; Seismic activity ; Seismic phenomena ; Slope stability ; submarine mass transport ; Transport</subject><ispartof>Geochemistry, geophysics, geosystems : G3, 2011-08, Vol.12 (8), p.np-n/a</ispartof><rights>Copyright 2011 by the American Geophysical Union.</rights><rights>Copyright 2011 by American Geophysical Union</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a5081-44909c25dd1223f4cce8499213d1b773a50cbc4c0de32c39a4525b395be22db93</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1029%2F2011GC003669$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1029%2F2011GC003669$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,776,780,1411,11541,27901,27902,45550,45551,46027,46451</link.rule.ids><linktorsrc>$$Uhttps://onlinelibrary.wiley.com/doi/abs/10.1029%2F2011GC003669$$EView_record_in_Wiley-Blackwell$$FView_record_in_$$GWiley-Blackwell</linktorsrc></links><search><creatorcontrib>Henkel, Susann</creatorcontrib><creatorcontrib>Strasser, Michael</creatorcontrib><creatorcontrib>Schwenk, Tilmann</creatorcontrib><creatorcontrib>Hanebuth, Till J. J.</creatorcontrib><creatorcontrib>Hüsener, Johannes</creatorcontrib><creatorcontrib>Arnold, Gail L.</creatorcontrib><creatorcontrib>Winkelmann, Daniel</creatorcontrib><creatorcontrib>Formolo, Michael</creatorcontrib><creatorcontrib>Tomasini, Juan</creatorcontrib><creatorcontrib>Krastel, Sebastian</creatorcontrib><creatorcontrib>Kasten, Sabine</creatorcontrib><title>An interdisciplinary investigation of a recent submarine mass transport deposit at the continental margin off Uruguay</title><title>Geochemistry, geophysics, geosystems : G3</title><addtitle>Geochem. Geophys. Geosyst</addtitle><description>Assessing frequency and extent of mass movement at continental margins is crucial to evaluate risks for offshore constructions and coastal areas. A multidisciplinary approach including geophysical, sedimentological, geotechnical, and geochemical methods was applied to investigate multistage mass transport deposits (MTDs) off Uruguay, on top of which no surficial hemipelagic drape was detected based on echosounder data. Nonsteady state pore water conditions are evidenced by a distinct gradient change in the sulfate (SO42−) profile at 2.8 m depth. A sharp sedimentological contact at 2.43 m coincides with an abrupt downward increase in shear strength from ∼10 to >20 kPa. This boundary is interpreted as a paleosurface (and top of an older MTD) that has recently been covered by a sediment package during a younger landslide event. This youngest MTD supposedly originated from an upslope position and carried its initial pore water signature downward. The kink in the SO42− profile ∼35 cm below the sedimentological and geotechnical contact indicates that bioirrigation affected the paleosurface before deposition of the youngest MTD. Based on modeling of the diffusive re‐equilibration of SO42− the age of the most recent MTD is estimated to be <30 years. The mass movement was possibly related to an earthquake in 1988 (∼70 km southwest of the core location). Probabilistic slope stability back analysis of general landslide structures in the study area reveals that slope failure initiation requires additional ground accelerations. Therefore, we consider the earthquake as a reasonable trigger if additional weakening processes (e.g., erosion by previous retrogressive failure events or excess pore pressures) preconditioned the slope for failure. Our study reveals the necessity of multidisciplinary approaches to accurately recognize and date recent slope failures in complex settings such as the investigated area.
Key Points
Pore water profiles can be used to identify and date recent mass transport deposits
Multidisciplinary studies are needed to assess the complexity of slide deposits
Recent slope failure off Uruguay might be related to an earthquake in 1988</description><subject>Biogeochemistry</subject><subject>Coastal zone</subject><subject>Contact</subject><subject>continental margin</subject><subject>Continental margins</subject><subject>Deposition</subject><subject>Earthquakes</subject><subject>Echosounders</subject><subject>Failure</subject><subject>Geobiology</subject><subject>Geophysics</subject><subject>Landslides</subject><subject>Marine geology</subject><subject>Mass transport</subject><subject>Multidisciplinary</subject><subject>Multidisciplinary research</subject><subject>Pore water</subject><subject>pore water geochemistry</subject><subject>Porosity</subject><subject>Seismic activity</subject><subject>Seismic phenomena</subject><subject>Slope stability</subject><subject>submarine mass transport</subject><subject>Transport</subject><issn>1525-2027</issn><issn>1525-2027</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2011</creationdate><recordtype>article</recordtype><sourceid>8G5</sourceid><sourceid>BENPR</sourceid><sourceid>GUQSH</sourceid><sourceid>M2O</sourceid><recordid>eNqF0c1u1DAUBeCoohKldMcDWN3AJsW-107iZTUqgWoEqtS_neU4nqlLxgm2A8zb12UqVLGgK1vWd650fIviHaMnjIL8CJSxdkEpVpXcKw6YAFEChfrVs_vr4k2M95QyLkRzUMynnjifbOhdNG4anNdhm19-2pjcWic3ejKuiCbBGusTiXO30cF5SzY6RpKC9nEaQyK9ncboEtGJpDtLzOhTVj7pIcuwdo9jVuQqzOtZb98W-ys9RHv0dB4WV5_OLhefy-W39svidFlqQRtWci6pNCD6ngHgihtjGy4lMOxZV9eYlekMN7S3CAal5rllh1J0FqDvJB4W73dzpzD-mHMltck17TBob8c5KgkVUkTkWX74r2QVB5BAG_oyFcA5YxzrTI__offjHHyurJoGoUH5B8EO_XKD3aopuPxhW8Woelyqer5U1bbtWd4iy6FyF3Ix2d9_Qzp8V1WNtVA3X1t1Lq4Xt7ftUl3gA6cXpVI</recordid><startdate>201108</startdate><enddate>201108</enddate><creator>Henkel, Susann</creator><creator>Strasser, Michael</creator><creator>Schwenk, Tilmann</creator><creator>Hanebuth, Till J. J.</creator><creator>Hüsener, Johannes</creator><creator>Arnold, Gail L.</creator><creator>Winkelmann, Daniel</creator><creator>Formolo, Michael</creator><creator>Tomasini, Juan</creator><creator>Krastel, Sebastian</creator><creator>Kasten, Sabine</creator><general>Blackwell Publishing Ltd</general><general>John Wiley & Sons, Inc</general><scope>BSCLL</scope><scope>3V.</scope><scope>7TG</scope><scope>7TN</scope><scope>7XB</scope><scope>88I</scope><scope>8FK</scope><scope>8G5</scope><scope>ABUWG</scope><scope>AEUYN</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BHPHI</scope><scope>BKSAR</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>F1W</scope><scope>GNUQQ</scope><scope>GUQSH</scope><scope>H96</scope><scope>HCIFZ</scope><scope>KL.</scope><scope>L.G</scope><scope>M2O</scope><scope>M2P</scope><scope>MBDVC</scope><scope>PCBAR</scope><scope>PHGZM</scope><scope>PHGZT</scope><scope>PKEHL</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>Q9U</scope><scope>8FD</scope><scope>FR3</scope><scope>H8D</scope><scope>KR7</scope><scope>L7M</scope></search><sort><creationdate>201108</creationdate><title>An interdisciplinary investigation of a recent submarine mass transport deposit at the continental margin off Uruguay</title><author>Henkel, Susann ; Strasser, Michael ; Schwenk, Tilmann ; Hanebuth, Till J. 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J.</creatorcontrib><creatorcontrib>Hüsener, Johannes</creatorcontrib><creatorcontrib>Arnold, Gail L.</creatorcontrib><creatorcontrib>Winkelmann, Daniel</creatorcontrib><creatorcontrib>Formolo, Michael</creatorcontrib><creatorcontrib>Tomasini, Juan</creatorcontrib><creatorcontrib>Krastel, Sebastian</creatorcontrib><creatorcontrib>Kasten, Sabine</creatorcontrib><collection>Istex</collection><collection>ProQuest Central (Corporate)</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Oceanic Abstracts</collection><collection>ProQuest Central (purchase pre-March 2016)</collection><collection>Science Database (Alumni Edition)</collection><collection>ProQuest Central (Alumni) (purchase pre-March 2016)</collection><collection>Research Library (Alumni Edition)</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest One Sustainability</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Natural Science Collection</collection><collection>Earth, Atmospheric & Aquatic Science Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>ProQuest Central Student</collection><collection>Research Library Prep</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>SciTech Premium Collection</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Research Library</collection><collection>Science Database</collection><collection>Research Library (Corporate)</collection><collection>Earth, Atmospheric & Aquatic Science Database</collection><collection>ProQuest Central (New)</collection><collection>ProQuest One Academic (New)</collection><collection>ProQuest One Academic Middle East (New)</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>ProQuest Central Basic</collection><collection>Technology Research Database</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Civil Engineering Abstracts</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Geochemistry, geophysics, geosystems : G3</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Henkel, Susann</au><au>Strasser, Michael</au><au>Schwenk, Tilmann</au><au>Hanebuth, Till J. J.</au><au>Hüsener, Johannes</au><au>Arnold, Gail L.</au><au>Winkelmann, Daniel</au><au>Formolo, Michael</au><au>Tomasini, Juan</au><au>Krastel, Sebastian</au><au>Kasten, Sabine</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>An interdisciplinary investigation of a recent submarine mass transport deposit at the continental margin off Uruguay</atitle><jtitle>Geochemistry, geophysics, geosystems : G3</jtitle><addtitle>Geochem. Geophys. Geosyst</addtitle><date>2011-08</date><risdate>2011</risdate><volume>12</volume><issue>8</issue><spage>np</spage><epage>n/a</epage><pages>np-n/a</pages><issn>1525-2027</issn><eissn>1525-2027</eissn><abstract>Assessing frequency and extent of mass movement at continental margins is crucial to evaluate risks for offshore constructions and coastal areas. A multidisciplinary approach including geophysical, sedimentological, geotechnical, and geochemical methods was applied to investigate multistage mass transport deposits (MTDs) off Uruguay, on top of which no surficial hemipelagic drape was detected based on echosounder data. Nonsteady state pore water conditions are evidenced by a distinct gradient change in the sulfate (SO42−) profile at 2.8 m depth. A sharp sedimentological contact at 2.43 m coincides with an abrupt downward increase in shear strength from ∼10 to >20 kPa. This boundary is interpreted as a paleosurface (and top of an older MTD) that has recently been covered by a sediment package during a younger landslide event. This youngest MTD supposedly originated from an upslope position and carried its initial pore water signature downward. The kink in the SO42− profile ∼35 cm below the sedimentological and geotechnical contact indicates that bioirrigation affected the paleosurface before deposition of the youngest MTD. Based on modeling of the diffusive re‐equilibration of SO42− the age of the most recent MTD is estimated to be <30 years. The mass movement was possibly related to an earthquake in 1988 (∼70 km southwest of the core location). Probabilistic slope stability back analysis of general landslide structures in the study area reveals that slope failure initiation requires additional ground accelerations. Therefore, we consider the earthquake as a reasonable trigger if additional weakening processes (e.g., erosion by previous retrogressive failure events or excess pore pressures) preconditioned the slope for failure. Our study reveals the necessity of multidisciplinary approaches to accurately recognize and date recent slope failures in complex settings such as the investigated area.
Key Points
Pore water profiles can be used to identify and date recent mass transport deposits
Multidisciplinary studies are needed to assess the complexity of slide deposits
Recent slope failure off Uruguay might be related to an earthquake in 1988</abstract><cop>Washington</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1029/2011GC003669</doi><tpages>19</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | Biogeochemistry Coastal zone Contact continental margin Continental margins Deposition Earthquakes Echosounders Failure Geobiology Geophysics Landslides Marine geology Mass transport Multidisciplinary Multidisciplinary research Pore water pore water geochemistry Porosity Seismic activity Seismic phenomena Slope stability submarine mass transport Transport |
| title | An interdisciplinary investigation of a recent submarine mass transport deposit at the continental margin off Uruguay |
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