Diachroneity of the Clearwater West and Clearwater East impact structures indicated by the (U–Th)/He dating method.

Biren, M. B., van Soest, M. C., Wartho, J.-A., Hodges, K. V. and Spray, J. G. (2016) Diachroneity of the Clearwater West and Clearwater East impact structures indicated by the (U–Th)/He dating method. Earth and Planetary Science Letters, 453 . pp. 56-66. DOI 10.1016/j.epsl.2016.07.053.

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Supplementary data:

Abstract

The (U–Th)/He method has been applied to constrain the formation ages of the Clearwater West and East impact structures of Quebec, Canada. Zircons were separated from impact melt samples derived from a surface exposure at Clearwater West (32 km diameter), and from a drill core at Clearwater East (26 km diameter). The (U–Th)/He results indicate ages of 280±27 Ma (2σ, n=7) for Clearwater West, and 450±56 Ma (2σ, n=8) for Clearwater East. Our (U–Th)/He date for Clearwater West supports the findings of previous Rb–Sr (266±15 Ma; 2σ) and 40Ar/39Ar (280±4 Ma and 283.8±2.2 Ma, 2σ) impact melt studies. Our (U–Th)/He date for Clearwater East also overlaps with previously published 40Ar/39Ar dating results, which yielded U-shaped spectra, with ‘maximum’ and ‘best-estimate’ dates of ∼ 460–470 Ma. Our results support the contention, previously based solely on 40Ar/39Ar data, that the Clearwater West and East impact structures do not comprise an impact doublet that formed coevally from a binary asteroid pair.

Document Type: Article
Additional Information: WOS:000383932300006
Keywords: helium diffusion; impact cratering; shock metamorphism; thermochronology
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS Magmatic and Hydrothermal Systems
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.epsl.2016.07.053
ISSN: 0012-821X
Related URLs:
Date Deposited: 09 Sep 2016 07:52
Last Modified: 01 Feb 2019 15:08
URI: http://oceanrep.geomar.de/id/eprint/33757

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