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U-Pb dating of calc...
U-Pb dating of calcite in ancient carbonates for age estimates of syn- to post-depositional processes : a case study from the upper Ediacaran strata of Finnmark, Arctic Norway
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- Meinhold, Guido (författare)
- Keele Univ, Sch Geog Geol & Environm, Keele ST5 5BG, Staffs, England.;Univ Gottingen, Dept Sedimentol & Environm Geol, Goldschmidtstr 3, D-37077 Gottingen, Germany.
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- Roberts, Nick M. W. (författare)
- British Geol Survey, Geochronol & Tracers Facil, Nottingham NG12 5GG, England.
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- Arslan, Arzu (författare)
- Keele Univ, Sch Geog Geol & Environm, Keele ST5 5BG, Staffs, England.
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- Jensen, Sören (författare)
- Univ Extremadura, Area Paleontol, Fac Ciencias, Ave Fis, E-06006 Badajoz, Spain.
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- Ebbestad, Jan Ove R., 1967- (författare)
- Uppsala universitet,Evolutionsmuseet
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- Högström, Anette E. S. (författare)
- UiT Arctic Univ Norway, Arctic Univ Museum Norway, N-9037 Tromso, Norway.
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- Hoyberget, Magne (författare)
- Rennesveien 14, N-4513 Mandal, Norway.
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- Agic, Heda (författare)
- Univ Calif Santa Barbara, Dept Earth Sci, Santa Barbara, CA 93106 USA.
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- Palacios, Teodoro (författare)
- Univ Extremadura, Area Paleontol, Fac Ciencias, Ave Fis, E-06006 Badajoz, Spain.
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- Taylor, Wendy L. (författare)
- Univ Cape Town, Dept Geol Sci, Private Bag X3, ZA-7701 Rondebosch, South Africa.
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Keele Univ, Sch Geog Geol & Environm, Keele ST5 5BG, Staffs, England;Univ Gottingen, Dept Sedimentol & Environm Geol, Goldschmidtstr 3, D-37077 Gottingen, Germany. British Geol Survey, Geochronol & Tracers Facil, Nottingham NG12 5GG, England. (creator_code:org_t)
- CAMBRIDGE UNIV PRESS, 2020
- 2020
- Engelska.
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Ingår i: Geological Magazine. - : CAMBRIDGE UNIV PRESS. - 0016-7568 .- 1469-5081. ; 157:8, s. 1367-1372
- Relaterad länk:
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https://doi.org/10.1...
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https://uu.diva-port... (primary) (Raw object)
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Results of in situ U-Pb dating of calcite spherulites, cone-in-cone (CIC) calcite and calcite fibres from a calcareous concretion of the upper Ediacaran of Finnmark, Arctic Norway, are reported. Calcite spherulites from the innermost layers of the concretion yielded a lower intercept age of 563 +/- 70 Ma, which, although imprecise, is within uncertainty of the age of sedimentation based on fossil assemblages. Non-deformed CIC calcite from the bottom part of the concretion yielded an age of 475 +/- 25 Ma, which is interpreted as the age of CIC calcite formation during a period of fluid overpressure induced during burial of the sediments. Deformed CIC calcite from the top part of the concretion yielded an age of 418 +/- 23 Ma, which overlaps with a known Caledonian tectono-metamorphic event, and indicates a potential post-depositional overprint at this time. Calcite fibres that grew in small fissures along spherulite rims, which are interpreted as a recrystallization feature during deformation and formation of a cleavage, gave an imprecise age of 486 +/- 161 Ma. Our results show that U-Pb dating of calcite can provide age constraints for ancient carbonates and syn- to post-depositional processes that operated during burial and metamorphic overprinting.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geologi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geology (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Annan geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Other Earth and Related Environmental Sciences (hsv//eng)
Nyckelord
- U-Pb calcite geochronology
- calcite spherulites
- cone-in-cone calcite
- Ediacaran
- Caledonides
- Norway
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Meinhold, Guido
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Roberts, Nick M. ...
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Arslan, Arzu
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Jensen, Sören
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Ebbestad, Jan Ov ...
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Högström, Anette ...
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Hoyberget, Magne
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Agic, Heda
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Palacios, Teodor ...
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Taylor, Wendy L.
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