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Zircon, titanite, and apatite (U-Th)/He ages and age-eU correlations from the Fennoscandian Shield, southern Sweden
Univ Illinois, USA.
Univ Arizona, USA.
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.ORCID iD: 0000-0001-7230-6509
Linnaeus University, Faculty of Health and Life Sciences, Department of Biology and Environmental Science.
2017 (English)In: Tectonics, ISSN 0278-7407, E-ISSN 1944-9194, Vol. 36, no 7, 1254-1274 p.Article in journal (Refereed) Published
Abstract [en]

Craton cores far from plate boundaries have traditionally been viewed as stable features that experience minimal vertical motion over 100-1000Ma time scales. Here we show that the Fennoscandian Shield in southeastern Sweden experienced several episodes of burial and exhumation from similar to 1800Ma to the present. Apatite, titanite, and zircon (U-Th)/He ages from surface samples and drill cores constrain the long-term, low-temperature history of the Laxemar region. Single grain titanite and zircon (U-Th)/He ages are negatively correlated (104-838Ma for zircon and 160-945Ma for titanite) with effective uranium (eU=U+0.235xTh), a measurement proportional to radiation damage. Apatite ages are 102-258Ma and are positively correlated with eU. These correlations are interpreted with damage-diffusivity models, and the modeled zircon He age-eU correlations constrain multiple episodes of heating and cooling from 1800Ma to the present, which we interpret in the context of foreland basin systems related to the Neoproterozoic Sveconorwegian and Paleozoic Caledonian orogens. Inverse time-temperature models constrain an average burial temperature of similar to 217 degrees C during the Sveconorwegian, achieved between 944Ma and 851Ma, and similar to 154 degrees C during the Caledonian, achieved between 366Ma and 224Ma. Subsequent cooling to near-surface temperatures in both cases could be related to long-term exhumation caused by either postorogenic collapse or mantle dynamics related to the final assembly of Rodinia and Pangaea. Our titanite He age-eU correlations cannot currently be interpreted in the same fashion; however, this study represents one of the first examples of a damage-diffusivity relationship in this system, which deserves further research attention.

Place, publisher, year, edition, pages
2017. Vol. 36, no 7, 1254-1274 p.
Keyword [en]
zircon (U-Th), He, Fennoscandian Shield, radiation damage, thermochronology, Titanite (U-Th)
National Category
Geology
Research subject
Natural Science
Identifiers
URN: urn:nbn:se:lnu:diva-67555DOI: 10.1002/2017TC004525ISI: 000407628600004OAI: oai:DiVA.org:lnu-67555DiVA: diva2:1137577
Available from: 2017-08-31 Created: 2017-08-31 Last updated: 2017-08-31Bibliographically approved

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Drake, HenrikTillberg, Mikael
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CiteExportLink to record
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Citation style
  • apa
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