Re–Os geochronology of the Neoproterozoic–Cambrian Dalradian Supergroup of Scotland and Ireland : implications for Neoproterozoic stratigraphy, glaciations and Re–Os systematics.
- Rooney, A.D.
- Chew, D.M.
- Selby, D.
DOIAbstract
New Re–Os geochronology for the Ballachulish Slate Formation of the Dalradian Supergroup, Scotland yields a depositional age of 659.6 ± 9.6 Ma. This age represents the first successful application of the Re–Os system to rocks that have extremely low Re and Os abundances (<1 ppb and <50 ppt, respectively). The Re–Os age represents a maximum age for the glaciogenic Port Askaig Formation and refutes previous chemostratigraphic and lithostratigraphic studies which correlated the Port Askaig Formation with a series of middle Cryogenian (ca. 715 Ma) glacials. Additionally, the Re–Os age strongly suggests that the Port Askaig Formation may be correlative with the 650 Ma end-Sturtian glaciations of Australia. As a consequence, the correlation of th...
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