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• W1970675814 abstract "Research Article| July 01, 1991 Open-system, constant-volume development of slaty cleavage, and strain-induced replacement reactions in the Martinsburg Formation, Lehigh Gap, Pennsylvania R. P. WINTSCH; R. P. WINTSCH 1Department of Geology, Indiana University, Bloomington, Indiana 47405 Search for other works by this author on: GSW Google Scholar C. M. KVALE; C. M. KVALE 1Department of Geology, Indiana University, Bloomington, Indiana 47405 Search for other works by this author on: GSW Google Scholar H. J. KISCH H. J. KISCH 2Department of Geology and Mineralogy, Ben-Gurion University of Negev, P.O. Box 653, Beer-Sheva, 84120, Israel Search for other works by this author on: GSW Google Scholar Author and Article Information R. P. WINTSCH 1Department of Geology, Indiana University, Bloomington, Indiana 47405 C. M. KVALE 1Department of Geology, Indiana University, Bloomington, Indiana 47405 H. J. KISCH 2Department of Geology and Mineralogy, Ben-Gurion University of Negev, P.O. Box 653, Beer-Sheva, 84120, Israel Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1991) 103 (7): 916–927. https://doi.org/10.1130/0016-7606(1991)103<0916:OSCVDO>2.3.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 R. P. WINTSCH, C. M. KVALE, H. J. KISCH; Open-system, constant-volume development of slaty cleavage, and strain-induced replacement reactions in the Martinsburg Formation, Lehigh Gap, Pennsylvania. GSA Bulletin 1991;; 103 (7): 916–927. doi: https://doi.org/10.1130/0016-7606(1991)103<0916:OSCVDO>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 SocietyGSA Bulletin Search Advanced Search Abstract No important changes in the volume of mudrocks occur across the mudstone-to-slate transition in the Martinsburg Formation at Lehigh Gap, Pennsylvania. Mass-balance calculations based on chemical analyses and specific-gravity measurements of 48 mudstones and 26 graywackes from the Martinsburg Formation across this 130-m strain gradient show constant ratios of Al2O3, TiO2, FeOT, MgO, MnO, Y, V, and Zr. This reflects the relatively low differential mobility of these components during diagenesis and slaty cleavage development, as well as the uniformity of compositions of the mudstones and graywackes at deposition. Using minimum-strain samples and Al2O3 as references, the calculations show no loss in SiO2, but large losses of CaO, Na2O, Ba, and Sr from the outcrop that are directly proportional to strain, and reflect an open system on the scale of kilometers. Analyses of graywacke-mudstone metagraywacke-slate) pairs show that losses in SiO2, Na2O, and volume, and gains in K2O and Ba in the graywacke/metagraywacke are balanced by opposite changes in the adjacent mudstone/slate. This documents a local mobility of SiO2 on the scale of centimeters. The inertness of most major components over the 100-m outcrop (especially SiO2), however, requires (1) that the composition of the fluid passing through the rocks was closely buffered by the quartz-albite-muscovite-chlorite assemblage, (2) that the volume of the fluid was small, and (3) that the P-T gradient down which it traveled was gentle. The changes in chemical composition identified can be explained by the inferred replacement reaction plag + 1M musc + K+ = 2M musc + qz + Ca+2 + Na+ + Sr+2 + Ba+2 The strong correlation of minor-element chemistry and strain indicates that this reaction was strain induced and that changes in bulk chemical composition are defined by the progress of this reaction. 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." @default.
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• W1970675814 title "Open-system, constant-volume development of slaty cleavage, and strain-induced replacement reactions in the Martinsburg Formation, Lehigh Gap, Pennsylvania" @default.
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