Abstract
Research Article| January 01, 1982 The metamorphic “basement” of Ecuador TOMAS FEININGER TOMAS FEININGER 1Département de Géologie, Université Laval, Québec, Québec, Canada G1K 7P4 Search for other works by this author on: GSW Google Scholar Author and Article Information TOMAS FEININGER 1Département de Géologie, Université Laval, Québec, Québec, Canada G1K 7P4 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1982) 93 (1): 87–92. https://doi.org/10.1130/0016-7606(1982)93<87:TMBOE>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 TOMAS FEININGER; The metamorphic “basement” of Ecuador. GSA Bulletin 1982;; 93 (1): 87–92. doi: https://doi.org/10.1130/0016-7606(1982)93<87:TMBOE>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 SocietyGSA Bulletin Search Advanced Search Abstract The metamorphic rocks of Ecuador, once thought to constitute a uniform and ancient basement, belong to several distinct units of widely differing ages, compositions, and metamorphic histories. The largest area of metamorphic rocks constitutes an unbroken belt on the eastern Andean slope from the Colombian to the Peruvian border. The bulk of the rocks in this belt are of Cretaceous age, and were metamorphosed in the greenschist facies under a barrovian facies series. Rocks in the extreme north, and those south of lat. 3° 15′S are different, and may be of Paleozoic age. A smaller terrain, on the western Andean slope in southwestern Ecuador, is yet more varied. It includes four metamorphic terrains: the polymetamorphic Piedras Group of Precambrian age; the low-pressure Tahuin Group of Paleozoic age; the high-pressure Raspas Formation of Cretaceous age; and a low-pressure terrain of uncertain age north of the La Palma fault. Several isolated outcrops of metamorphic rocks in Ecuador are of uncertain significance. 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.
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