Juvenile Middle Proterozoic crust in the Adirondack Highlands, Grenville province, northeastern North America

Research Article| February 01, 1991 Juvenile Middle Proterozoic crust in the Adirondack Highlands, Grenville province, northeastern North America J. S. Daly; J. S. Daly 1Department of Geology, University College Dublin, Belfield, Dublin 4, Ireland Search for other works by this author on: GSW Google Scholar J. M. McLelland J. M. McLelland 2Department of Geology, Colgate University, Hamilton, New York 13346 Search for other works by this author on: GSW Google Scholar Geology (1991) 19 (2): 119–122. https://doi.org/10.1130/0091-7613(1991)019<0119:JMPCIT>2.3.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation J. S. Daly, J. M. McLelland; Juvenile Middle Proterozoic crust in the Adirondack Highlands, Grenville province, northeastern North America. Geology 1991;; 19 (2): 119–122. doi: https://doi.org/10.1130/0091-7613(1991)019<0119:JMPCIT>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Nd isotope data indicate that minimal amounts of significantly older crust have contributed to the genesis of the oldest (ca. 1.3-13.5 Ga) plutons in the Adirondack Highlands. These are magmatic arc tonalites with positive initial ϵNd values and Sm-Nd depleted mantle model ages (tDM) that are within 70 m.y. of the time of their crystallization. Granitoids of the anorthosite-mangerite-charnockite-granite suite, dated at 1156-1134 Ma, as well as the 1100-1050 Ma plutons, associated with the Ottawan phase of the Grenvillian orogenic cycle, also have positive initial ϵNd values and tDM ages similar to the tonalites. Derivation of both groups of granitoids by crustal melting of the magmatic arc is consistent with the available isotopic and geochemical data. Juvenile late Middle Proterozoic crust that formed during or just prior to the Grenville cycle appears to dominate the southwestern Grenville province as well as the Grenville inliers to the south. In contrast, most of the contiguous Grenville province in Canada comprises largely reworked older crust. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.