Magnetic analyses of soils from the Wind River Range, Wyoming, constrain rates and pathways of magnetic enhancement for soils from semiarid climates
In order to constrain the rate of magnetic enhancement in soils, we investigated modern soils from five fluvial terraces in the eastern Wind River Range, Wyoming. Profiles up to 1.2 m deep were sampled in 5‐cm intervals from hand‐dug pits or natural riverbank exposures. Soils formed in fluvial terra...
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| description | In order to constrain the rate of magnetic enhancement in soils, we investigated modern soils from five fluvial terraces in the eastern Wind River Range, Wyoming. Profiles up to 1.2 m deep were sampled in 5‐cm intervals from hand‐dug pits or natural riverbank exposures. Soils formed in fluvial terraces correlated to the Sacajawea Ridge (730–610 ka BP), Bull Lake (130–100 ka BP) and Pinedale‐age (∼20 ka BP) glacial advances. One soil profile formed in Holocene‐age sediment. Abundance, mineralogy, and grain size of magnetic minerals were estimated through magnetic measurements. Magnetic enhancement of the A‐horizon as well as an increase in fine‐grained magnetic minerals occurred mostly in Bull Lake profiles but was absent from the older profile. Such low rates of magnetic enhancement may limit the temporal resolution of paleosol‐based paleoclimate reconstructions in semiarid regions even where high sedimentation rates result in multiple paleosols. A loss of ferrimagnetic and an increase in antiferromagnetic minerals occurred with age. Our findings suggest either the conversion of ferrimagnetic minerals to weakly magnetic hematite with progressing soil age, or the presence of ferrimagnetic minerals as an intermediate product of pedogenesis. Absolute and relative hematite abundance increase with age, making both useful proxies for soil age and the dating of regional glacial deposits. All coercivity proxies are consistent with each other, which suggests that observed changes in HIRM and S‐ratio are representative of real changes in hematite abundance rather than shifts in coercivity distributions, even though the modified L‐ratio varies widely.
Key Points
Magnetic enhancement in semiarid soils occurs over timescales of 100,000 years
Pedogenic maghemite appears an intermediate phase in the enhancement process
HIRM is a valid tool for the quantification of hematite even if L‐ratio varies |
| doi_str_mv | 10.1029/2011GC003728 |
| format | Article |
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Key Points
Magnetic enhancement in semiarid soils occurs over timescales of 100,000 years
Pedogenic maghemite appears an intermediate phase in the enhancement process
HIRM is a valid tool for the quantification of hematite even if L‐ratio varies</description><identifier>ISSN: 1525-2027</identifier><identifier>EISSN: 1525-2027</identifier><identifier>DOI: 10.1029/2011GC003728</identifier><language>eng</language><publisher>Washington: Blackwell Publishing Ltd</publisher><subject>Freshwater ; Glacial deposits ; hematite ; Holocene ; Lakes ; magnetic enhancement ; Magnetism ; Mineralogy ; Minerals ; Paleoclimate ; Paleosols ; pedogenesis ; River banks ; Rivers ; Rocks ; Sedimentation rates ; Semiarid climates ; Semiarid lands ; Soil analysis ; Soil profiles ; Terraces ; Wind</subject><ispartof>Geochemistry, geophysics, geosystems : G3, 2011-07, Vol.12 (7), 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-c4100-facb768afc0965ab8e502c3255b3d42a3f1e69e97f41f38fb5d672ce9551c9e73</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%2F2011GC003728$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1029%2F2011GC003728$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,777,781,1412,11543,27905,27906,45555,45556,46033,46457</link.rule.ids><linktorsrc>$$Uhttps://onlinelibrary.wiley.com/doi/abs/10.1029%2F2011GC003728$$EView_record_in_Wiley-Blackwell$$FView_record_in_$$GWiley-Blackwell</linktorsrc></links><search><creatorcontrib>Quinton, Emily E.</creatorcontrib><creatorcontrib>Dahms, Dennis E.</creatorcontrib><creatorcontrib>Geiss, Christoph E.</creatorcontrib><title>Magnetic analyses of soils from the Wind River Range, Wyoming, constrain rates and pathways of magnetic enhancement for soils from semiarid climates</title><title>Geochemistry, geophysics, geosystems : G3</title><addtitle>Geochem. Geophys. Geosyst</addtitle><description>In order to constrain the rate of magnetic enhancement in soils, we investigated modern soils from five fluvial terraces in the eastern Wind River Range, Wyoming. Profiles up to 1.2 m deep were sampled in 5‐cm intervals from hand‐dug pits or natural riverbank exposures. Soils formed in fluvial terraces correlated to the Sacajawea Ridge (730–610 ka BP), Bull Lake (130–100 ka BP) and Pinedale‐age (∼20 ka BP) glacial advances. One soil profile formed in Holocene‐age sediment. Abundance, mineralogy, and grain size of magnetic minerals were estimated through magnetic measurements. Magnetic enhancement of the A‐horizon as well as an increase in fine‐grained magnetic minerals occurred mostly in Bull Lake profiles but was absent from the older profile. Such low rates of magnetic enhancement may limit the temporal resolution of paleosol‐based paleoclimate reconstructions in semiarid regions even where high sedimentation rates result in multiple paleosols. A loss of ferrimagnetic and an increase in antiferromagnetic minerals occurred with age. Our findings suggest either the conversion of ferrimagnetic minerals to weakly magnetic hematite with progressing soil age, or the presence of ferrimagnetic minerals as an intermediate product of pedogenesis. Absolute and relative hematite abundance increase with age, making both useful proxies for soil age and the dating of regional glacial deposits. All coercivity proxies are consistent with each other, which suggests that observed changes in HIRM and S‐ratio are representative of real changes in hematite abundance rather than shifts in coercivity distributions, even though the modified L‐ratio varies widely.
Key Points
Magnetic enhancement in semiarid soils occurs over timescales of 100,000 years
Pedogenic maghemite appears an intermediate phase in the enhancement process
HIRM is a valid tool for the quantification of hematite even if L‐ratio varies</description><subject>Freshwater</subject><subject>Glacial deposits</subject><subject>hematite</subject><subject>Holocene</subject><subject>Lakes</subject><subject>magnetic enhancement</subject><subject>Magnetism</subject><subject>Mineralogy</subject><subject>Minerals</subject><subject>Paleoclimate</subject><subject>Paleosols</subject><subject>pedogenesis</subject><subject>River banks</subject><subject>Rivers</subject><subject>Rocks</subject><subject>Sedimentation rates</subject><subject>Semiarid climates</subject><subject>Semiarid lands</subject><subject>Soil analysis</subject><subject>Soil profiles</subject><subject>Terraces</subject><subject>Wind</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>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><sourceid>GUQSH</sourceid><sourceid>M2O</sourceid><recordid>eNqFkc1u1DAURiNEJUrLjgewWLFoqH9iJ1miURuQpq1UgYaddcdzPeOS2IOdacl78MC4HUCjbljZi_Oda9-vKN4y-oFR3p5zylg3o1TUvHlRHDPJZckpr18e3F8Vr1O6o5RVUjbHxa8rWHscnSHgoZ8SJhIsScH1idgYBjJukCycX5Fbd4-R3IJf4xlZTGFwfn1GTPBpjOA8iTDmMGRyC-PmAaYn0_BXj34D3uCAfiQ2xMMRCQcH0a2I6d3waDktjiz0Cd_8OU-Kr5cXX2afyvlN93n2cV6ailFaWjDLWjVgDW2VhGWDknIjuJRLsao4CMtQtdjWtmJWNHYpV6rmBlspmWmxFifF-713G8OPHaZRDy4Z7HvwGHZJMyUr1Qoh6f_RvHrOalGzjL57ht6FXczbTbppqcpNKZEhvoceXI-T3sb88zhljX5sUh82qbuuu-D06RHlPuTSiD__hSB-1yqPlnpx3enmm-jm8-tLLcRv2pCicA</recordid><startdate>201107</startdate><enddate>201107</enddate><creator>Quinton, Emily E.</creator><creator>Dahms, Dennis E.</creator><creator>Geiss, Christoph E.</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>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>Q9U</scope><scope>7QH</scope><scope>7UA</scope><scope>C1K</scope></search><sort><creationdate>201107</creationdate><title>Magnetic analyses of soils from the Wind River Range, Wyoming, constrain rates and pathways of magnetic enhancement for soils from semiarid climates</title><author>Quinton, Emily E. ; Dahms, Dennis E. ; Geiss, Christoph E.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c4100-facb768afc0965ab8e502c3255b3d42a3f1e69e97f41f38fb5d672ce9551c9e73</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2011</creationdate><topic>Freshwater</topic><topic>Glacial deposits</topic><topic>hematite</topic><topic>Holocene</topic><topic>Lakes</topic><topic>magnetic enhancement</topic><topic>Magnetism</topic><topic>Mineralogy</topic><topic>Minerals</topic><topic>Paleoclimate</topic><topic>Paleosols</topic><topic>pedogenesis</topic><topic>River banks</topic><topic>Rivers</topic><topic>Rocks</topic><topic>Sedimentation rates</topic><topic>Semiarid climates</topic><topic>Semiarid lands</topic><topic>Soil analysis</topic><topic>Soil profiles</topic><topic>Terraces</topic><topic>Wind</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Quinton, Emily E.</creatorcontrib><creatorcontrib>Dahms, Dennis E.</creatorcontrib><creatorcontrib>Geiss, Christoph E.</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 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>Aqualine</collection><collection>Water Resources Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><jtitle>Geochemistry, geophysics, geosystems : G3</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Quinton, Emily E.</au><au>Dahms, Dennis E.</au><au>Geiss, Christoph E.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Magnetic analyses of soils from the Wind River Range, Wyoming, constrain rates and pathways of magnetic enhancement for soils from semiarid climates</atitle><jtitle>Geochemistry, geophysics, geosystems : G3</jtitle><addtitle>Geochem. Geophys. Geosyst</addtitle><date>2011-07</date><risdate>2011</risdate><volume>12</volume><issue>7</issue><spage>np</spage><epage>n/a</epage><pages>np-n/a</pages><issn>1525-2027</issn><eissn>1525-2027</eissn><abstract>In order to constrain the rate of magnetic enhancement in soils, we investigated modern soils from five fluvial terraces in the eastern Wind River Range, Wyoming. Profiles up to 1.2 m deep were sampled in 5‐cm intervals from hand‐dug pits or natural riverbank exposures. Soils formed in fluvial terraces correlated to the Sacajawea Ridge (730–610 ka BP), Bull Lake (130–100 ka BP) and Pinedale‐age (∼20 ka BP) glacial advances. One soil profile formed in Holocene‐age sediment. Abundance, mineralogy, and grain size of magnetic minerals were estimated through magnetic measurements. Magnetic enhancement of the A‐horizon as well as an increase in fine‐grained magnetic minerals occurred mostly in Bull Lake profiles but was absent from the older profile. Such low rates of magnetic enhancement may limit the temporal resolution of paleosol‐based paleoclimate reconstructions in semiarid regions even where high sedimentation rates result in multiple paleosols. A loss of ferrimagnetic and an increase in antiferromagnetic minerals occurred with age. Our findings suggest either the conversion of ferrimagnetic minerals to weakly magnetic hematite with progressing soil age, or the presence of ferrimagnetic minerals as an intermediate product of pedogenesis. Absolute and relative hematite abundance increase with age, making both useful proxies for soil age and the dating of regional glacial deposits. All coercivity proxies are consistent with each other, which suggests that observed changes in HIRM and S‐ratio are representative of real changes in hematite abundance rather than shifts in coercivity distributions, even though the modified L‐ratio varies widely.
Key Points
Magnetic enhancement in semiarid soils occurs over timescales of 100,000 years
Pedogenic maghemite appears an intermediate phase in the enhancement process
HIRM is a valid tool for the quantification of hematite even if L‐ratio varies</abstract><cop>Washington</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1029/2011GC003728</doi><tpages>16</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | Freshwater Glacial deposits hematite Holocene Lakes magnetic enhancement Magnetism Mineralogy Minerals Paleoclimate Paleosols pedogenesis River banks Rivers Rocks Sedimentation rates Semiarid climates Semiarid lands Soil analysis Soil profiles Terraces Wind |
| title | Magnetic analyses of soils from the Wind River Range, Wyoming, constrain rates and pathways of magnetic enhancement for soils from semiarid climates |
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