Volcano-tectonic segmentation of the northern Andes

Abstract

Research Article| March 01, 1985 Volcano-tectonic segmentation of the northern Andes M. L. Hall; M. L. Hall 1Facultad de Geologia, Escuela Politecnica Nacional, Quito, Ecuador Search for other works by this author on: GSW Google Scholar C. A. Wood C. A. Wood 2SN4/NASA Johnson Space Center, Houston, Texas 77058 Search for other works by this author on: GSW Google Scholar Geology (1985) 13 (3): 203–207. https://doi.org/10.1130/0091-7613(1985)13<203:VSOTNA>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 M. L. Hall, C. A. Wood; Volcano-tectonic segmentation of the northern Andes. Geology 1985;; 13 (3): 203–207. doi: https://doi.org/10.1130/0091-7613(1985)13<203:VSOTNA>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 Data from LANDSAT images, published geologic and geophysical reports, and field observations are used to document eight major transverse boundaries that divide the northern Andes into segments about 125 km long. Most of the segment boundaries have no apparent relation to structure on the Nazca plate being subducted, and may instead represent fundamental and long-lasting structures of the continent. Subduction of the Carnegie Ridge results in increased uplift of the Andes, widespread and chemically diverse volcanism, and major faulting and seismicity. Subduction of a highly fractured zone in southern Ecuador has led to the formation of a separate platelet with a distinct orientation and to a notable change in volcanic style—from andesitic stratovolcanoes to rhyolitic ash-flow sheets. Recognition of the segmented structure of the northern Andes provides a framework for interpreting details of the regional geology and illustrates that not all segment boundaries are related to Subduction. 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.