Collaborative Research: "Double-Double Dating" of Detrital Monazite and Detrital Zircon: Quantifying Sediment Recycling in Tectonic Studies

Grants and Contracts Details


Objective Research will test a novel but simple approach for detecting the presence and estimating the proportion of a recycled sediment component in a long-lived foreland basin clastic system. Preliminary research indicates that "detrital diagenetic monazite", i.e., detrital monazite grains in arenites that exhibit textural evidence and Th-Pb SIMS ages of having formed in an older clastic sequence, must be recycled. The detrital grains are readily distinguishable based on textures and ages from detrital monazite derived from crystalline rocks in the source terrane. We propose (1) to test the wider applicability of this approach in a foreland basin sequence in which repeated recycling is likely to have occurred; (2) to test the effectiveness of this approach for detecting recycling compared to detrital zircon U-Pb + (U-Th)-Pb "double dating"; (3) to test the effectiveness of detrital monazite "double dating" for detecting recycling; (4) and to compare provenance information from detrital minerals versus Nd isotope analysis on monazite single grains. Textural analysis (BSE imaging) of detrital monazite permits distinction between detrital diagenetic monazite and detrital metamorphic monazite; the presence of the former is the mineralogic fingerprint of sediment recycling. Pilot datasets on detrital monazite/zircon geochronology for latest Paleozoic Appalachian foreland basin arenites and Late Neoproterozoic rift basin clastics generated in prior research by the PIs will be expanded to include Middle Ordovician (Taconian) and Devonian-Mississippian (Acadian) clastic wedges, so as to produce a complete history of, e.g., sediment first released into the Appalachian foreland system in the Neoproterozoic, repeatedly recycled through the present, and currently being transported in modern river systems.
Effective start/end date8/1/164/30/22


  • National Science Foundation: $214,334.00


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