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• W1982344733 endingPage "1035" @default.
• W1982344733 startingPage "1019" @default.
• W1982344733 abstract "Research Article| August 01, 2002 Sedimentologic-magnetic record of western Pangean climate in upper Paleozoic loessite (lower Cutler beds, Utah) G.S. (Lynn) Soreghan; G.S. (Lynn) Soreghan 1School of Geology and Geophysics, University of Oklahoma, Norman, Oklahoma 73019, USA Search for other works by this author on: GSW Google Scholar R. Douglas Elmore; R. Douglas Elmore 1School of Geology and Geophysics, University of Oklahoma, Norman, Oklahoma 73019, USA Search for other works by this author on: GSW Google Scholar Michael T. Lewchuk Michael T. Lewchuk 1School of Geology and Geophysics, University of Oklahoma, Norman, Oklahoma 73019, USA Search for other works by this author on: GSW Google Scholar Author and Article Information G.S. (Lynn) Soreghan 1School of Geology and Geophysics, University of Oklahoma, Norman, Oklahoma 73019, USA R. Douglas Elmore 1School of Geology and Geophysics, University of Oklahoma, Norman, Oklahoma 73019, USA Michael T. Lewchuk 1School of Geology and Geophysics, University of Oklahoma, Norman, Oklahoma 73019, USA Publisher: Geological Society of America Received: 23 May 2001 Revision Received: 14 Dec 2001 Accepted: 05 Mar 2002 First Online: 01 Jun 2017 Online Issn: 1943-2674 Print Issn: 0016-7606 Geological Society of America GSA Bulletin (2002) 114 (8): 1019–1035. https://doi.org/10.1130/0016-7606(2002)114<1019:SMROWP>2.0.CO;2 Article history Received: 23 May 2001 Revision Received: 14 Dec 2001 Accepted: 05 Mar 2002 First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation G.S. (Lynn) Soreghan, R. Douglas Elmore, Michael T. Lewchuk; Sedimentologic-magnetic record of western Pangean climate in upper Paleozoic loessite (lower Cutler beds, Utah). GSA Bulletin 2002;; 114 (8): 1019–1035. doi: https://doi.org/10.1130/0016-7606(2002)114<1019:SMROWP>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Sedimentologic, pedologic, and magnetic data within the upper Paleozoic lower Cutler beds of the southwestern Paradox basin (Utah) record high- and low-frequency climate changes that operated at equatorial latitudes of western Pangea. The lower Cutler beds consist of ∼250 m of lithified eolian silt (loessite) and marine-reworked and fluvially reworked loessite, with abundant intercalated paleosols comprising Protosols, Argillisols, and Calcisols. The evolution from loessite and marine-reworked loessite with abundant Calcisols in the lower section to loessite and fluvially reworked loessite with abundant Argillisols in the upper section records a long-term transition from semiarid conditions in western equatorial Pangea in latest Pennsylvanian time to seasonally wet conditions in earliest Permian time. This shift could record intensification of the Pangean megamonsoon and associated seasonal incursions of moisture-laden westerlies. Paleosols record relatively high-frequency fluctuations between drier, dustier glacials and wetter interglacials of the late Paleozoic. Bulk magnetic-susceptibility values in paleosols exhibit variations that track paleosol type and are significantly elevated relative to parent loessite, attributable to the occurrence of both ultrafine-grained (superparamagnetic) and coarser-grained (remanence-carrying) magnetite. This signature reflects in situ pedogenic production of ferrimagnetic phases and a subordinate component of allochthonous, magnetic dust influx during pedogenesis, analogous to processes inferred for the magnetic signature in the Pliocene–Pleistocene loess-paleosol sequences of, e.g., the Chinese Loess Plateau. Integration of sedimentologic, geochemical, and magnetic data further suggests that enhancement of magnetic susceptibility in loessitic paleosols of this section relates primarily to climatic conditions and secondarily to durations of pedogenesis. Whereas peak susceptibility values in mature paleosols (Argillisols and Calcisols) do not vary significantly through the study section, peak values for Protosols track facies evidence for wetter conditions through time. Accordingly, relative changes in paleosol susceptibility values can provide paleoclimatic information, but should be integrated with other data to fully assess the origin of the signature. Overall, our data document the applicability of analytical approaches used on recent loess to very ancient loessite; this result is significant, because loess commonly records high- resolution evidence of terrestrial climate and climate change. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
• W1982344733 created "2016-06-24" @default.
• W1982344733 creator A5027750769 @default.
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• W1982344733 date "2002-08-01" @default.
• W1982344733 modified "2023-09-23" @default.
• W1982344733 title "Sedimentologic-magnetic record of western Pangean climate in upper Paleozoic loessite (lower Cutler beds, Utah)" @default.
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