The Taconian orogeny in southern New England: Nd-isotope evidence against addition of juvenile components.

Bock, Barbara, McLennan, S. M. and Hanson, G. N. (1996) The Taconian orogeny in southern New England: Nd-isotope evidence against addition of juvenile components. Canadian Journal of Earth Sciences, 33 (12). pp. 1612-1627. DOI 10.1139/e96-122.

Full text not available from this repository.

Supplementary data:

Abstract

Nd-isotope data for pre-Taconian (meta)sedimentary and igneous rocks, syn-Taconian (meta)sedimentary rocks, and Late Ordovician–Silurian plutonic rocks indicate that the Ordovician Taconian orogeny did not add significant amounts of juvenile crust to the Laurentian margin in southern New England. Nd-isotope compositions of Grenvillian crust and Late Proterozoic to Early Cambrian rift sediments range from εNd of −3.1 to −6.6 at 450 Ma. Sedimentary rocks deposited during the Cambrian and the early Middle Ordovician, which represent the drift stage of Laurentia, and earliest Taconian sedimentary rocks show more negative εNd(450 Ma), with a range from −11.7 to −13.3. Sedimentary rocks deposited in response to the Taconian orogeny have uniform εNd(450 Ma) values of about −8. Middle to Late Ordovician and Permian plutonic rocks from southwestern Connecticut have εNd(450 Ma) values of −2 to −5, which indicates that these rocks contain older crustal components. Rocks with juvenile Nd characteristics are the early Paleozoic Maltby Lake Volcanics (εNd(450 Ma) +8) from southwestern Connecticut, and Middle Ordovician igneous samples from the Hawley Formation (εNd(450 Ma) +6 to −0.6) in Massachusetts.

Document Type: Article
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1139/e96-122
ISSN: 0008-4077
Date Deposited: 18 Feb 2008 17:23
Last Modified: 18 Mar 2020 10:32
URI: http://oceanrep.geomar.de/id/eprint/6697

Actions (login required)

View Item View Item