Permian bulk shortening in the Narragansett Basin of southeastern New England, USA

Rich, B.H. (2006) Permian bulk shortening in the Narragansett Basin of southeastern New England, USA. Journal of Structural Geology, 28 (4). pp. 682-694.

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Pennsylvanian age sediments within the Narragansett Basin allow the effects of Alleghanian deformation to be distinguished from the Taconic and Acadian orogenies that affected the rocks to the west. Three-dimensional microstructural analyses of both matrix foliations and structures preserved in porphyroblasts define two extended periods of deformation and metamorphism about two differently-trending foliation intersection/inflection axes in porphyroblasts (FIAs). SSW–NNE-trending FIAs (set 1) formed first followed by WSW–ENE-trending FIAs (set 2). The SSW–NNE FIA trends from the south-central zone lie parallel to regional folds in the entire southern graben. The changes in FIA trends reveal that the direction of maximum bulk shortening changed from WNW–ESE to NNW–SSE during amphibolite facies metamorphism within the Central Zone of the basin. They reveal a more varied history than the simple kinematic framework of solely W–E directed bulk shortening that was previously suggested.

Item ID: 4106
Item Type: Article (Research - C1)
ISSN: 0191-8141
Keywords: bulk shortening; FIAs; porphyroblast timing
Date Deposited: 28 Sep 2009 04:14
SEO Codes: 84 MINERAL RESOURCES (excl. Energy Resources) > 8499 Other Mineral Resources (excl. Energy Resources) > 849999 Mineral Resources (excl. Energy Resources) not elsewhere classified @ 100%
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