Revisiting the chronology of a key loess section in North America using multiple luminescence dating methods.
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| Title: | Revisiting the chronology of a key loess section in North America using multiple luminescence dating methods. |
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| Authors: | Avram, A.1,2 anca.giurgea@ubbcluj.ro, Mason, J. A.3, del Valle Villalonga, L.2,4, Constantin, D.2, Grecu, S.1,2, Veres, D.5, Marković, S.6,7,8, Timar-Gabor, A.1,2 alida.timar@ubbcluj.ro |
| Source: | Geological Society of America Bulletin. Jul2025, Vol. 137 Issue 7/8, p3207-3220. 14p. |
| Subject Terms: | *Optically stimulated luminescence, *Thermoluminescence dating, *Loess, *Interglacials, *Glaciation, *Colluvium, *High temperatures |
| Geographic Terms: | Loveland (Colo.), North America |
| Abstract: | The Loveland paratype section contains valuable records of the climatic conditions during glacial and interglacial periods across the midcontinent of North America. Previous studies have focused on developing chronological data for the last glacial period, and only a few studies have reported ages for older loess units. Therefore, the aim of this study is to refine the chronological framework of the Loveland paratype section, especially for the deposition of Loveland Loess, using a combination of state-of-the-art luminescence methods. Three sets of optically stimulated luminescence (OSL) ages were obtained by applying single-aliquot regenerative (SAR) dose protocol on coarse (63-90 μm) quartz and two elevated temperature post-infrared infrared stimulated luminescence (pIRIR) protocols, namely pIRIR225 and pIRIR290, on polymineral fine grains extracted from seven samples. For the uppermost five samples collected from Pisgah Loess and upper Loveland Loess, we report coarse quartz SAR-OSL ages that range from 49 ± 4 ka to 146 ± 13 ka. For the older samples, only pIRIR ages were reported due to the saturation of luminescence signal from quartz. Except for the lowermost sample, the ages agree with those of previous studies reported for this loess section. However, for the oldest samples, which were collected from the bottom of the Loveland Loess, an age is reported that predates the Illinoian glaciation. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: enr DbLabel: Energy & Power Source An: 186855521 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Revisiting the chronology of a key loess section in North America using multiple luminescence dating methods. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Avram%2C+A%2E%22">Avram, A.</searchLink><relatesTo>1,2</relatesTo><i> anca.giurgea@ubbcluj.ro</i><br /><searchLink fieldCode="AR" term="%22Mason%2C+J%2E+A%2E%22">Mason, J. A.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22del+Valle+Villalonga%2C+L%2E%22">del Valle Villalonga, L.</searchLink><relatesTo>2,4</relatesTo><br /><searchLink fieldCode="AR" term="%22Constantin%2C+D%2E%22">Constantin, D.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Grecu%2C+S%2E%22">Grecu, S.</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Veres%2C+D%2E%22">Veres, D.</searchLink><relatesTo>5</relatesTo><br /><searchLink fieldCode="AR" term="%22Marković%2C+S%2E%22">Marković, S.</searchLink><relatesTo>6,7,8</relatesTo><br /><searchLink fieldCode="AR" term="%22Timar-Gabor%2C+A%2E%22">Timar-Gabor, A.</searchLink><relatesTo>1,2</relatesTo><i> alida.timar@ubbcluj.ro</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Geological+Society+of+America+Bulletin%22">Geological Society of America Bulletin</searchLink>. Jul2025, Vol. 137 Issue 7/8, p3207-3220. 14p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Optically+stimulated+luminescence%22">Optically stimulated luminescence</searchLink><br />*<searchLink fieldCode="DE" term="%22Thermoluminescence+dating%22">Thermoluminescence dating</searchLink><br />*<searchLink fieldCode="DE" term="%22Loess%22">Loess</searchLink><br />*<searchLink fieldCode="DE" term="%22Interglacials%22">Interglacials</searchLink><br />*<searchLink fieldCode="DE" term="%22Glaciation%22">Glaciation</searchLink><br />*<searchLink fieldCode="DE" term="%22Colluvium%22">Colluvium</searchLink><br />*<searchLink fieldCode="DE" term="%22High+temperatures%22">High temperatures</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Loveland+%28Colo%2E%29%22">Loveland (Colo.)</searchLink><br /><searchLink fieldCode="DE" term="%22North+America%22">North America</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The Loveland paratype section contains valuable records of the climatic conditions during glacial and interglacial periods across the midcontinent of North America. Previous studies have focused on developing chronological data for the last glacial period, and only a few studies have reported ages for older loess units. Therefore, the aim of this study is to refine the chronological framework of the Loveland paratype section, especially for the deposition of Loveland Loess, using a combination of state-of-the-art luminescence methods. Three sets of optically stimulated luminescence (OSL) ages were obtained by applying single-aliquot regenerative (SAR) dose protocol on coarse (63-90 μm) quartz and two elevated temperature post-infrared infrared stimulated luminescence (pIRIR) protocols, namely pIRIR225 and pIRIR290, on polymineral fine grains extracted from seven samples. For the uppermost five samples collected from Pisgah Loess and upper Loveland Loess, we report coarse quartz SAR-OSL ages that range from 49 ± 4 ka to 146 ± 13 ka. For the older samples, only pIRIR ages were reported due to the saturation of luminescence signal from quartz. Except for the lowermost sample, the ages agree with those of previous studies reported for this loess section. However, for the oldest samples, which were collected from the bottom of the Loveland Loess, an age is reported that predates the Illinoian glaciation. [ABSTRACT FROM AUTHOR] |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1130/B38165.1 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 14 StartPage: 3207 Subjects: – SubjectFull: Optically stimulated luminescence Type: general – SubjectFull: Thermoluminescence dating Type: general – SubjectFull: Loess Type: general – SubjectFull: Interglacials Type: general – SubjectFull: Glaciation Type: general – SubjectFull: Colluvium Type: general – SubjectFull: High temperatures Type: general – SubjectFull: Loveland (Colo.) Type: general – SubjectFull: North America Type: general Titles: – TitleFull: Revisiting the chronology of a key loess section in North America using multiple luminescence dating methods. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Avram, A. – PersonEntity: Name: NameFull: Mason, J. A. – PersonEntity: Name: NameFull: del Valle Villalonga, L. – PersonEntity: Name: NameFull: Constantin, D. – PersonEntity: Name: NameFull: Grecu, S. – PersonEntity: Name: NameFull: Veres, D. – PersonEntity: Name: NameFull: Marković, S. – PersonEntity: Name: NameFull: Timar-Gabor, A. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 07 Text: Jul2025 Type: published Y: 2025 Identifiers: – Type: issn-print Value: 00167606 Numbering: – Type: volume Value: 137 – Type: issue Value: 7/8 Titles: – TitleFull: Geological Society of America Bulletin Type: main |
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