Proterozoic and Phanerozoic basement terranes of Mexico from Nd isotopic studies

Abstract

Research Article| February 01, 1988 Proterozoic and Phanerozoic basement terranes of Mexico from Nd isotopic studies JOAQUIN RUIZ; JOAQUIN RUIZ 1Department of Geosciences, University of Arizona, Tucson, Arizona 85721 Search for other works by this author on: GSW Google Scholar P. JONATHAN PATCHETT; P. JONATHAN PATCHETT 1Department of Geosciences, University of Arizona, Tucson, Arizona 85721 Search for other works by this author on: GSW Google Scholar FERNANDO ORTEGA-GUTIERREZ FERNANDO ORTEGA-GUTIERREZ 2Instituto de Geologia, Universidad Nacional Autonoma de Mexico, Mexico, D.F. Search for other works by this author on: GSW Google Scholar Author and Article Information JOAQUIN RUIZ 1Department of Geosciences, University of Arizona, Tucson, Arizona 85721 P. JONATHAN PATCHETT 1Department of Geosciences, University of Arizona, Tucson, Arizona 85721 FERNANDO ORTEGA-GUTIERREZ 2Instituto de Geologia, Universidad Nacional Autonoma de Mexico, Mexico, D.F. Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1988) 100 (2): 274–281. https://doi.org/10.1130/0016-7606(1988)100<0274:PAPBTO>2.3.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation JOAQUIN RUIZ, P. JONATHAN PATCHETT, FERNANDO ORTEGA-GUTIERREZ; Proterozoic and Phanerozoic basement terranes of Mexico from Nd isotopic studies. GSA Bulletin 1988;; 100 (2): 274–281. doi: https://doi.org/10.1130/0016-7606(1988)100<0274:PAPBTO>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 SocietyGSA Bulletin Search Advanced Search Abstract Nd isotopic data were collected on Precambrian crystalline rocks exposed in northern, eastern, and southern Mexico, as well as from lower crustal xenoliths from central Mexico, in order to constrain the age and character of the Mexican basement. The data indicate that basement belonging to the Grenville (1.0 Ga) tectonothermal event extends from Los Filtros, in Chihuahua, northern Mexico, to Oaxaca, in southern Mexico. These rocks all have average Nd crustal residence times (TDM ages) in the range 1.60 to 1.35 Ga. We infer that this results from mixing average 1.9 Ga or older recycled continental crust with 70% to 90% newly derived mantle-crustal material during the Grenville orogeny. To the west of the Precambrian, the basement contains large amounts of Phanerozoic (probably Paleozoic) crust, identified from lower crustal xenoliths with TDM ages less than 1.0 Ga. The crust represented by these xenoliths may have been emplaced as suspect terranes in Mesozoic Cordilleran events. Alternatively, the apparent Paleozoic crust that underlies parts of central Mexico may connect to the Paleozoic metamorphic Acatlan complex in southern Mexico, and together they would constitute a continuation of the Appalachian-Caledonian orogenic belt through Mexico. Our data do not preclude either of these two models. 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.