Stable Isotope and Magnesium Geochemistry of Recent Planktonic Foraminifera from the South Pacific

Abstract

Research Article| July 01, 1973 Stable Isotope and Magnesium Geochemistry of Recent Planktonic Foraminifera from the South Pacific SAMUEL M. SAVIN; SAMUEL M. SAVIN 1Department of Geology, Case Western Reserve University, Cleveland, Ohio 44106 Search for other works by this author on: GSW Google Scholar ROBERT G. DOUGLAS ROBERT G. DOUGLAS 1Department of Geology, Case Western Reserve University, Cleveland, Ohio 44106 Search for other works by this author on: GSW Google Scholar GSA Bulletin (1973) 84 (7): 2327–2342. https://doi.org/10.1130/0016-7606(1973)84<2327:SIAMGO>2.0.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 SAMUEL M. SAVIN, ROBERT G. DOUGLAS; Stable Isotope and Magnesium Geochemistry of Recent Planktonic Foraminifera from the South Pacific. GSA Bulletin 1973;; 84 (7): 2327–2342. doi: https://doi.org/10.1130/0016-7606(1973)84<2327:SIAMGO>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 O18/O16, C13/C12, and magnesium analyses were performed on a large number of Recent planktonic Foraminifera from South Pacific Ocean sediments. Results show that oxygen isotopic temperatures of Foraminifera tests may be used to locate ocean currents and to define the orientation of large crustal plates relative to the earth's rotational poles. Selective solution effects may cause isotopic temperatures of some species to become progressively colder with increasing water depth of the sediments from which they are taken. Where this is not taken into account, erroneous conclusions may result from the comparison of isotopic temperatures of samples from different locations. Depths at which Foraminifera secrete their tests appear to be determined by density and ultimately by osmotic equilibration with surrounding sea water. Susceptibility of Foraminifera tests to selective solution after death increases with magnesium content. Carbon isotope ratios correlate crudely with both temperature and salinity. The C13/C12 ratio of dissolved or particulate carbon in the oceans is probably the most important factor in determining the C13/C12 ratio of the test. 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.