Geochronology of the Monteregian Hills alkaline igneous province, Quebec

Research Article| August 01, 1984 Geochronology of the Monteregian Hills alkaline igneous province, Quebec G. Nelson Eby G. Nelson Eby 1Department of Earth Sciences, University of Lowell, Lowell, Massachusetts 01854 Search for other works by this author on: GSW Google Scholar Author and Article Information G. Nelson Eby 1Department of Earth Sciences, University of Lowell, Lowell, Massachusetts 01854 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1984) 12 (8): 468–470. https://doi.org/10.1130/0091-7613(1984)12<468:GOTMHA>2.0.CO;2 Article history First Online: 01 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 G. Nelson Eby; Geochronology of the Monteregian Hills alkaline igneous province, Quebec. Geology 1984;; 12 (8): 468–470. doi: https://doi.org/10.1130/0091-7613(1984)12<468:GOTMHA>2.0.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 Three distinct groups of alkaline rocks can be recognized, on the basis of silica content, in the Monteregian Hills, Quebec: strongly undersaturated, slightly undersaturated to critically saturated, and oversaturated. The first two groups were derived from basanite and alkali picrite magmas, respectively, and yield distinct ages of intrusion clustered about 118 Ma and 136 Ma. The age data are not readily explained by the translation of the North American plate across a fixed mantle hotspot, but because the alkali picrite magmas were derived from greater mantle depths than the basanite magmas, the data do suggest an upward migration of the zone of melting. This change in the depth of melting may be a response to the upward transport of a metasomatic fluid, perhaps with a coupled rise in mantle isotherms. 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.