Rb-Sr whole-rock and 40 Ar/ 39 Ar mineral ages of the Hartland Stock, South-central Maine; a post-Acadian representative of the New Hampshire Plutonic Series

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ID: 308724
1982
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Abstract
The Hartland granodioritic stock is an undeformed, post-Acadian representative of the New Hampshire Plutonic series that intrudes low-grade Silurian-Devonian (.) metasedimentary rocks in south-central Maine. A nine-point, Rb-Sr whole-rock isochron defines an age of 360 +/- 8 m.y. for the pluton (initial /sup 87/Sr//sup 86/Sr = 0.7056 +/- 3). Biotite and hornblende from the pluton display undisturbed /sup 40/Ar//sup 39/Ar age spectra with mutually overlapping dates of 362 +/- 5 m.y. (seven samples). The undisturbed character of the argon isotopic systems suggests that the /sup 40/Ar//sup 39/Ar ages date times of post-magmatic cooling through temperatures required for retention of argon. Comparison of the emplacement age defined for the Hartland stock with Rb-Sr whole-rock isochron dates reported for crystallization of other New Hampshire Series plutons suggests continuous Devonian intrusive activity in New England, preceding, during, and following the Acadian orogeny. No geochronologic evidence for separating distinct subseries of intrusion can be provided with presently available data.
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openalex_W1991221485 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors R. D. Dallmeyer, O. van Breemen, James A. Whitney
Journal american journal of science
Year 1982
DOI
10.2475/ajs.282.1.79
URL
https://ajs.scholasticahq.com/article/60183.pdf
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