The age of salinic deformation constrained by 40 Ar/ 39 Ar dating of multiple cleavage domains: Bathurst Supergroup, New Brunswick Appalachians

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ID: 305000
2017
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Abstract
In the New Brunswick Appalachians, polydeformed felsic volcanic rocks of the Bathurst Supergroup record four cleavage-forming tectonic events, of which D~1~ and D~2~ record subduction-related underplating of buoyant elements of the Tetagouche backarc basin and subsequent collision between composite Laurentia and the Gander margin, respectively, during the Salinic orogenic cycle. Here we present an integrated approach to dating multiple cleavage domains in which we performed step heat ^40^Ar/^39^Ar analyses, microstructural observations and mineral-chemistry analysis on a suite of samples, as well as *in situ*^40^Ar/^39^Ar analysis on two samples from the suite with clear S~1~ and S~2~ cleavage relationships. We use this dataset to characterize the complex relationships between S~1~ and S~2~ white mica between samples at different structural settings across the supergroup. We refine the timing of S~1~ white mica growth, and hence M~1~-D~1~ of the Salinic cycle in the Bathurst Supergroup to *ca.* 452 to 437 Ma, and S~2~ white mica growth (also D~2~) to *ca.* 427 to 418 Ma. New and published data indicate local thermal resetting of white mica at *ca.* 411 Ma, which we interpret to indicate a buried intrusion, likely a component of the Central plutonic belt. Delineation of the two white mica age components, particularly within a single sample, was informed by both spatially-controlled analysis (*in situ*^40^Ar/^39^Ar), and the higher age precision of step heat ^40^Ar/^39^Ar analyses.
Reference Key
openalex_W2607256856 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Dawn A. Kellett, Cees R. van Staal, R. A. Wilson, N Rogers
Journal american journal of science
Year 2017
DOI
10.2475/03.2017.02
URL
https://doi.org/10.2475/03.2017.02
Keywords Keywords not found

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