TRACE ELEMENTS IN PELITIC ROCKS

Abstract

Research Article| December 01, 1954 TRACE ELEMENTS IN PELITIC ROCKS: PART I: VARIATION DURING METAMORPHISM DENIS M SHAW DENIS M SHAW MCMASTER UNIVERSITY, HAMILTON, ONTARIO Search for other works by this author on: GSW Google Scholar Author and Article Information DENIS M SHAW MCMASTER UNIVERSITY, HAMILTON, ONTARIO Publisher: Geological Society of America Received: 15 Jun 1953 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1954, 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 (1954) 65 (12): 1151–1166. https://doi.org/10.1130/0016-7606(1954)65[1151:TEIPR]2.0.CO;2 Article history Received: 15 Jun 1953 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 DENIS M SHAW; TRACE ELEMENTS IN PELITIC ROCKS: PART I: VARIATION DURING METAMORPHISM. GSA Bulletin 1954;; 65 (12): 1151–1166. doi: https://doi.org/10.1130/0016-7606(1954)65[1151:TEIPR]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 Sixty-three rocks of the pelitic Devonian Littleton formation of New Hampshire have been analyzed spectrographically for trace elements. The samples represent all grades of metamorphism from shales to sillimanite schists and gneisses. The average concentrations and standard deviations in ppm are: Ga, 19, 6.3; Cr, 110, 33; V, 120, 39; Li, 110,104; Ni, 64, 26; Co, 18, 6.6; Cu, 18, 18; Sc, 14, 7.4; Zr, 200, 73; Y, 45, 20; Sr, 710, 310; Pb, 24, 12. Be, Mo, Sn, La, and Ag were usually below the sensitivity limits of 30, 10, 20, 100, and 1 ppm respectively. Ba almost always exceeds 1000 ppm.Figures for individual analyses were grouped according to low- medium- or high-grade metamorphism. Statistical tests show a rather wide range in original composition, which suggests that it is unwise to deduce composition changes from a few analyses. The analyses, however, show that the concentration of most elements remained constant during regional metamorphism. Ni and Cu show a slight decrease, and Li and Pb a well-defined increase of the order of 100 per cent accompanying the metamorphism. This increase is a metasomatism at the trace-element level, which probably accompanies the potash-metasomatism encountered by Billings in the same formation. 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.