Research Article| July 01, 1947 CHEMICAL ANALYSES AND CALCULATED MODES OF THE OLIVERIAN MAGMA SERIES, MT. WASHINGTON QUADRANGLE, NEW HAMPSHIRE MARLAND P BILLINGS; MARLAND P BILLINGS GEOLOGICAL MUSEUM. OXFORD ST., CAMBRIDGE 38, MASS.; U. S. GEOLOGICAL SURVEY, WASHINGTON 25, D. C. Search for other works by this author on: GSW Google Scholar JOHN C RABBITT JOHN C RABBITT GEOLOGICAL MUSEUM. OXFORD ST., CAMBRIDGE 38, MASS.; U. S. GEOLOGICAL SURVEY, WASHINGTON 25, D. C. Search for other works by this author on: GSW Google Scholar Author and Article Information MARLAND P BILLINGS GEOLOGICAL MUSEUM. OXFORD ST., CAMBRIDGE 38, MASS.; U. S. GEOLOGICAL SURVEY, WASHINGTON 25, D. C. JOHN C RABBITT GEOLOGICAL MUSEUM. OXFORD ST., CAMBRIDGE 38, MASS.; U. S. GEOLOGICAL SURVEY, WASHINGTON 25, D. C. Publisher: Geological Society of America Received: 26 Sep 1946 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1947, 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 (1947) 58 (7): 573–596. https://doi.org/10.1130/0016-7606(1947)58[573:CAACMO]2.0.CO;2 Article history Received: 26 Sep 1946 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 MARLAND P BILLINGS, JOHN C RABBITT; CHEMICAL ANALYSES AND CALCULATED MODES OF THE OLIVERIAN MAGMA SERIES, MT. WASHINGTON QUADRANGLE, NEW HAMPSHIRE. GSA Bulletin 1947;; 58 (7): 573–596. doi: https://doi.org/10.1130/0016-7606(1947)58[573:CAACMO]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 Complete chemical analyses, including the spectrographic determination of 44 trace elements, have been made of six representative specimens from each of the six map units constituting the Oliverian magma series in the Mt. Washington quadrangle of New Hampshire. Potash is systematically higher than soda. An increase in silica, which ranges from 56 to 75 per cent, is accompanied by the usual variation of the other principal oxides; lime, magnesia, and total iron decrease in the more siliceous rocks, whereas potash and soda increase at first and then decline. Potash is 1.5 to 3 per cent higher than soda throughout the series.With increasing silica content Cr2O3, NiO, SrO, V2O5, and BaO decrease, but ZnO increases. Comparisons with other parts of the world, especially northwestern Europe, suggest some systematic differences from New Hampshire, but the data are insufficient to justify any definite conclusions.The calculation of modes from the chemical analyses necessitates a discussion of the methods involved and the possible errors. It is believed that in these rocks the modes can be calculated with relatively small errors. An unexplained excess of alumina in the modes, ranging from 0.0 to 1.0 per cent, may be due to more sericite and clay minerals in the rocks than the content of water suggests. 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.