Arc-related sodic hydrothermal alteration in the western United States

Abstract

Research Article| October 01, 1995 Arc-related sodic hydrothermal alteration in the western United States Denise A. Battles; Denise A. Battles 1Department of Geology and Geography, Georgia Southern University, Statesboro, Georgia 30460-8149 Search for other works by this author on: GSW Google Scholar Mark D. Barton Mark D. Barton 2Department of Geosciences, University of Arizona, Tucson, Arizona 85721 Search for other works by this author on: GSW Google Scholar Geology (1995) 23 (10): 913–916. https://doi.org/10.1130/0091-7613(1995)023<0913:ARSHAI>2.3.CO;2 Article history first online: 02 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 Denise A. Battles, Mark D. Barton; Arc-related sodic hydrothermal alteration in the western United States. Geology 1995;; 23 (10): 913–916. doi: https://doi.org/10.1130/0091-7613(1995)023<0913:ARSHAI>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 SocietyGeology Search Advanced Search Abstract Sodium-rich hydrothermal alteration is widely developed in Permian to Jurassic arc igneous rocks of the western United States, but it is rare in younger rocks. Na-rich alteration reflects a paleogeographic control on development. Two varieties, NaCa and Na, can be defined by mineralogic and compositional changes. Both are common in Permian to Jurassic arc plutonic and volcanic rocks and are accompanied by Fe and Cu ± Zn mineralization. Geologic relations and mineralogic, stable isotopic, and fluid-inclusion data indicate that the fluids responsible for sodium-rich alteration were isotopically heavy, moderately to highly saline fluids of marine, formation, and/or meteoric origin, with or without a magmatic component. The transition away from widespread Na ± Ca-rich alteration in the late Mesozoic corresponds to and is consistent with the change from an early Mesozoic marine and/or arid rifted arc setting to a fully emergent, continental arc environment in the Cretaceous. 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.