Article (Scientific journals)
Resolving mid- to upper-crustal exhumation through apatite petrochronology and thermochronology
Jepson, G.; Carrapa, B.; George, S. W. M. et al.
2021In Chemical Geology, 565 (March), p. 120071
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Keywords :
Binary alloys; Cooling systems; Faulting; Fission reactions; Geochemistry; Lead alloys; Metamorphic rocks; Trace elements; Uranium alloys; Detachment faulting; Geochemical signatures; Metamorphic core complex; Structural information; Temperature window; Trace element geochemistry; Trace element partitioning; Whole-rock geochemistries; Apatite
Abstract :
[en] Double-dating using the apatite U-Pb and fission-track systems is becoming an increasingly popular method for resolving mid- to upper- crustal cooling. However, these thermochronometers constrain dates that are often difficult to link through geological time due to the large difference in temperature window between the two systems (typically >250 °C). In this study, we apply apatite U-Pb, fission-track, and apatite and whole rock geochemistry to fourteen samples from four tectonic domains common in Cordilleran orogenic systems: (1) basement-cored uplifts, (2) plutons intruded through a thick crustal column, (3) metamorphic core complexes and associated detachment faults, and (4) rapid, extrusive volcanic cooling, in order to provide a link between in situ geochemical signatures and cooling mechanisms. Comparisons of trace element partitioning between apatite and whole rock provide insights into initial apatite-forming processes and/or subsequent modification. Apatite trace element geochemistry and the Th/U and La/LuN ratios provide tools to determine if an apatite is primary and representative of its parent melt or if it has undergone geochemical perturbation(s) after crystallization. Further, we demonstrate that by using a combined apatite U-Pb, FT, trace element, and whole rock geochemistry approach it is possible to determine if a rock has undergone monotonic cooling since crystallization, protracted residence in the middle crust, and provide unique structural information such as the history of detachment faulting. Insights provided herein offer new applications for apatite thermochronology. © 2021 Elsevier B.V.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Jepson, G.;  Department of Geosciences, University of Arizona, Tucson, AZ, United States
Carrapa, B.;  Department of Geosciences, University of Arizona, Tucson, AZ, United States
George, S. W. M.;  Department of Geosciences, University of Arizona, Tucson, AZ, United States
Triantafyllou, Antoine ;  Université de Liège - ULg
Egan, S. M.;  Department of Geosciences, University of Arizona, Tucson, AZ, United States
Constenius, K. N.;  Department of Geosciences, University of Arizona, Tucson, AZ, United States
Gehrels, G. E.;  Department of Geosciences, University of Arizona, Tucson, AZ, United States
Ducea, M. N.;  Department of Geosciences, University of Arizona, Tucson, AZ, United States, Faculty of Geology and Geophysics, University of Bucharest, Bucharest, Romania
Language :
English
Title :
Resolving mid- to upper-crustal exhumation through apatite petrochronology and thermochronology
Publication date :
2021
Journal title :
Chemical Geology
ISSN :
0009-2541
Publisher :
Elsevier, Netherlands
Volume :
565
Issue :
March
Pages :
120071
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 16 July 2021

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