Shocked titanite records Chicxulub hydrothermal alteration and impact age
Nicholas E. TimmsChristopher L. KirklandAaron J. CavosieAuriol S. P. RaeWilliam D.A. RickardNoreen J. EvansTimmons M. EricksonA. WittmannL. FerrièreG. S. CollinsS. P. S. Gulick
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Keywords:
Titanite
Trace element
Radiogenic nuclide
Impact structure
Isotopic signature
Abstract— Impact ejecta eroded and transported by gravity flows, tsunamis, or glaciers have been reported from a number of impact structures on Earth. Impact ejecta reworked by fluvial processes, however, are sparsely mentioned in the literature. This suggests that shocked mineral grains and impact glasses are unstable when eroded and transported in a fluvial system. As a case study, we here present a report of impact ejecta affected by multiple fluvial reworking including rounded quartz grains with planar deformation features and diaplectic quartz and feldspar glass in pebbles of fluvial sandstones from the “Monheimer Höhensande” ?10 km east of the Ries crater in southern Germany.
Impact structure
Bedrock
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Radiogenic nuclide
Isotopic signature
Biogeochemical Cycle
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Titanite
Impact structure
Overprinting
Closure temperature
Radiometric dating
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