Petrology of Gypsum-Anhydrite Deposits in Southwestern Indiana

Abstract

Other| September 01, 1956 Petrology of gypsum-anhydrite deposits in southwestern Indiana Wayne Miley Bundy Wayne Miley Bundy Search for other works by this author on: GSW Google Scholar Author and Article Information Wayne Miley Bundy Publisher: SEPM Society for Sedimentary Geology First Online: 03 Mar 2017 Online ISSN: 1938-3681 Print ISSN: 1527-1404 GeoRef, Copyright 2006, American Geological Institute. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States Journal of Sedimentary Research (1956) 26 (3): 240–252. https://doi.org/10.1306/74D705F1-2B21-11D7-8648000102C1865D Article history First Online: 03 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Wayne Miley Bundy; Petrology of gypsum-anhydrite deposits in southwestern Indiana. Journal of Sedimentary Research 1956;; 26 (3): 240–252. doi: https://doi.org/10.1306/74D705F1-2B21-11D7-8648000102C1865D 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 SocietyJournal of Sedimentary Research Search Advanced Search Abstract Crystalloblastic anhydrite, present in some dolomitic parts of the St. Louis limestone (Mississippian, Meramecian) in southwestern Indiana, is exemplified by two different textural associations: (1) gneissic porphyroblastic anhydride in extensive lenticular beds, and (2) a later stage of porphyroblasts and veins formed penecontemporaneously with dolomite rhombs. Magnesium sulfate solutions acting upon calcium carbonate may have brought about the anhydride-dolomite association. Magnesium ions, necessary to form the sulfate solution, may have been released from the gypsum lattice upon conversion to anhydride or from some other sources. Textural characteristics of the gypsum indicate that it was formed by hydration from recrystallized anhydride. Although primary gypsum could not be recognized as such, much of the calcium sulfate was probably originally precipitated as gypsum. For gypsification to take place, space must be available for water in addition to space occupied by anhydride; this total volume (anhydride plus water) is greater than the amount of space occupied by the resultant gypsum. Distortion of rocks may follow gypsification of anhydride but is the result of directional forces exerted by crystals within gypsum veins rather than total volume expansion. Results of X-ray studies indicate that hemihydrate is a rare mineral constituent of the Indiana deposits. 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.