GEOCHEMISTRY OF HORNBLENDE ALTERATION IN PLIOCENE RED BEDS, BAJA CALIFORNIA, MEXICO

Abstract

Research Article| August 01, 1967 GEOCHEMISTRY OF HORNBLENDE ALTERATION IN PLIOCENE RED BEDS, BAJA CALIFORNIA, MEXICO T. R WALKER; T. R WALKER UNIVERSITY OF COLORADO, BOULDER, COLORADO (WALKER AND HONEA) Search for other works by this author on: GSW Google Scholar P. H RIBBE; P. H RIBBE VIRGINIA POLYTECHNIC INSTITUTE, BLACKSBURG, VIRGINIA (RIBBE) Search for other works by this author on: GSW Google Scholar R. M HONEA R. M HONEA UNIVERSITY OF COLORADO, BOULDER, COLORADO (WALKER AND HONEA) Search for other works by this author on: GSW Google Scholar Author and Article Information T. R WALKER UNIVERSITY OF COLORADO, BOULDER, COLORADO (WALKER AND HONEA) P. H RIBBE VIRGINIA POLYTECHNIC INSTITUTE, BLACKSBURG, VIRGINIA (RIBBE) R. M HONEA UNIVERSITY OF COLORADO, BOULDER, COLORADO (WALKER AND HONEA) Publisher: Geological Society of America Received: 27 Jun 1966 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1967, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1967) 78 (8): 1055–1060. https://doi.org/10.1130/0016-7606(1967)78[1055:GOHAIP]2.0.CO;2 Article history Received: 27 Jun 1966 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation T. R WALKER, P. H RIBBE, R. M HONEA; GEOCHEMISTRY OF HORNBLENDE ALTERATION IN PLIOCENE RED BEDS, BAJA CALIFORNIA, MEXICO. GSA Bulletin 1967;; 78 (8): 1055–1060. doi: https://doi.org/10.1130/0016-7606(1967)78[1055:GOHAIP]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 chemical and mineralogical changes that have taken place during intrastratal alteration of hornblende in Pliocene red beds of Baja California, Mexico, were determined by electron-probe microanalysis and X-ray diffraction studies. The hornblende has altered to iron-rich montmorillonite, and thin sections show that this clay ultimately forms hematite-stained matrix. The alteration involves loss of iron, alkalis, alkaline earths, and probably silica. The authigenic clay shows progressive decrease in iron content outward from the decomposing hornblende, indicating selective removal from the clay by intrastratal leaching. The authigenic clay is therefore an important source of iron for hematite pigment, particularly in the matrix of these red beds. 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.