FN Archimer Export Format
PT J
TI A Mesoarchean shift in uranium isotope systematics
BT 
AF WANG, Xiangli
   PLANAVSKY, Noah J.
   HOFMANN, Axel
   SAUPE, Erin E.
   DE CORTE, Brian P.
   PHILIPPOT, Pascal
   LALONDE, Stefan
   JEMISON, Noah E.
   ZOU, Huijuan
   OSSA, Frantz Ossa
   RYBACKI, Kyle
   ALFIMOVA, Nadezhda
   LARSON, Matthew J.
   TSIKOS, Harilaos
   FRALICK, Philip W.
   JOHNSON, Thomas M.
   KNUDSEN, Andrew C.
   REINHARD, Christopher T.
   KONHAUSER, Kurt O.
AS 1:1,2;2:3;3:4;4:1,5;5:6;6:7,8;7:9;8:10;9:1;10:4;11:11;12:12;13:6;14:13;15:14;16:10;17:6;18:11;19:15;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:;12:;13:;14:;15:;16:;17:;18:;19:;
C1 Univ S Alabama, Dept Marine Sci, Mobile, AL 36688 USA.
   Dauphin Isl Sea Lab, Dauphin Isl, AL 36258 USA.
   Yale Univ, Dept Geol & Geophys, POB 6666, New Haven, CT 06511 USA.
   Univ Johannesburg, Dept Geol, ZA-2092 Johannesburg, South Africa.
   Univ Oxford, Dept Earth Sci, S Parks Rd, Oxford, England.
   Lawrence Univ, Dept Geol, Appleton, WI 54911 USA.
   Univ Paris Diderot, CNRS, Sorbonne Paris Cite, Inst Phys Globe Paris, 1 Rue Jussieu, F-75238 Paris, France.
   Univ Montpellier, UMR 5243, Geosci Montpellier, CNRS, F-34000 Montpellier, France.
   CNRS, European Inst Marine Studies, Domaines Ocean UMR6538, Technopole Brest Iroise, F-29280 Plouzane, France.
   Univ Illinois, Dept Geol, Champaign, IL 61820 USA.
   Georgia Inst Technol, Sch Earth & Atmospher Sci, Atlanta, GA 30332 USA.
   St Petersburg State Univ, Univ Skaya Nab 7-9, St Petersburg 199034, Russia.
   Rhodes Univ, Geol Dept, ZA-6140 Grahamstown, South Africa.
   Lakehead Univ, Dept Geol, Thunder Bay, ON P7B 5E1, Canada.
   Univ Alberta, Dept Earth & Atmospher Sci, Edmonton, AB T6G 2E3, Canada.
C2 UNIV S ALABAMA, USA
   DAUPHIN ISL SEA LAB, USA
   UNIV YALE, USA
   UNIV JOHANNESBURG, SOUTH AFRICA
   UNIV OXFORD, UK
   UNIV LAWRENCE, USA
   UNIV PARIS 07, FRANCE
   UNIV MONTPELLIER, FRANCE
   CNRS, FRANCE
   UNIV ILLINOIS, USA
   GEORGIA INST TECHNOL, USA
   UNIV ST PETERSBURG STATE, RUSSIA
   UNIV RHODES, SOUTH AFRICA
   UNIV LAKEHEAD, CANADA
   UNIV ALBERTA, CANADA
UM LGO
IF 4.258
TC 45
UR https://archimer.ifremer.fr/doc/00638/74970/88236.pdf
LA English
DT Article
DE ;Uranium isotope;Archean;Oxygenation;Oxygenic photosynthesis;Trace metal
AB Oxygenic photosynthesis fundamentally transformed all major biogeochemical cycles and increased the size and complexity of Earth's biosphere. However, there is still debate about when this metabolism evolved. As oxygenic photosynthesis is the only significant source of O-2 at Earth's surface, O-2 -sensitive trace element enrichments and isotopic signatures in Archean sedimentary rocks can potentially be used to determine the onset of oxygenic photosynthesis by tracking shifts in the oxidative capacity of Earth's surface environment. Here, we present an extensive new Archean U isotope record from iron formations, organic-rich shales, and paleosols. Variability in delta U-238 values gradually increased from Archean to Phanerozoic, consistent with current view of gradual oxidation of Earth's surface. In addition, statistical analysis on available delta U-238 data indicates a turning point of delta U-238 variability at roughly 3.0 billon years ago. We suggest that such a turning point in delta U-238 variability indicates the initiation of relatively large-scale oxidative weathering of U(IV)-bearing minerals, implying that oxygenic photosynthesis may have evolved before 3.0 billion years ago. 
PY 2018
PD OCT
SO Geochimica Et Cosmochimica Acta
SN 0016-7037
PU Pergamon-elsevier Science Ltd
VL 238
UT 000441893500025
BP 438
EP 452
DI 10.1016/j.gca.2018.07.024
ID 74970
ER

EF