Related Strontium Isotopic and Chemical Variations in Oceanic Basalts

Research Article| February 01, 1971 Related Strontium Isotopic and Chemical Variations in Oceanic Basalts ZELL E PETERMAN; ZELL E PETERMAN U.S. Geological Survey, Denver, Colorado 80225 Search for other works by this author on: GSW Google Scholar CARL E HEDGE CARL E HEDGE U.S. Geological Survey, Denver, Colorado 80225 Search for other works by this author on: GSW Google Scholar GSA Bulletin (1971) 82 (2): 493–500. https://doi.org/10.1130/0016-7606(1971)82[493:RSIACV]2.0.CO;2 Article history received: 15 Sep 1970 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 ZELL E PETERMAN, CARL E HEDGE; Related Strontium Isotopic and Chemical Variations in Oceanic Basalts. GSA Bulletin 1971;; 82 (2): 493–500. doi: https://doi.org/10.1130/0016-7606(1971)82[493:RSIACV]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 Sr87/Sr86 values in oceanic basalts range from 0.7012 to 0.7057 and correlate with basalt composition as measured by the ratio K2O/(Na2O + K2O). The distribution of data points on this plot can be approximated by the following ranges in Sr87/Sr86 and K2O/(K2O + Na2O) respectively: (l) ocean ridge tholeiites—0.7020 to 0.7035 (one value 0.7012), <0.10; (2) many island tholeiites and alkali basalts—0.7030 to 0.7045, 0.10 to 0.30; and (3) potassic island basaltic rocks—0.7040 to 0.7057, >0.30. If the volcanism occurring throughout much of geologic time preferentially depleted rubidium and potassium relative to strontium in the mantle, preservation of the resultant heterogeneities is necessary to explain the isotopic and chemical differences among oceanic basalts. As a corollary to this long-term depletion of rubidium and potassium of the mantle, the primitive mantle or total crust-mantle system would have an Sr87/Sr86 value higher than many oceanic basalts derived from zones that have undergone multistage histories. Therefore, we suggest that the potassic lavas with Sr87/Sr86 higher than those of ocean ridge tholeiites and many island basalts represent the least depleted or most primitive mantle sampled by young oceanic volcanism. 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.