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RADIOACTIVITY OF THE ROCKS OF THE BATHOLITH OF SOUTHERN CALIFORNIA

1947; Geological Society of America; Volume: 58; Issue: 6 Linguagem: Inglês

10.1130/0016-7606(1947)58[483

1943-2674

E. S. LARSEN, N. B. Keevil,

Radioactive contamination and transfer

Research Article| June 01, 1947 RADIOACTIVITY OF THE ROCKS OF THE BATHOLITH OF SOUTHERN CALIFORNIA E. S LARSEN; E. S LARSEN GEOLOGICAL MUSEUM, OXFORD STREET, CAMBRIDGE, MASS; UNIVERSITY OF TORONTO, TORONTO, CANADA Search for other works by this author on: GSW Google Scholar N. B KEEVIL N. B KEEVIL GEOLOGICAL MUSEUM, OXFORD STREET, CAMBRIDGE, MASS; UNIVERSITY OF TORONTO, TORONTO, CANADA Search for other works by this author on: GSW Google Scholar Author and Article Information E. S LARSEN GEOLOGICAL MUSEUM, OXFORD STREET, CAMBRIDGE, MASS; UNIVERSITY OF TORONTO, TORONTO, CANADA N. B KEEVIL GEOLOGICAL MUSEUM, OXFORD STREET, CAMBRIDGE, MASS; UNIVERSITY OF TORONTO, TORONTO, CANADA Publisher: Geological Society of America Received: 01 Jul 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 (6): 483–494. https://doi.org/10.1130/0016-7606(1947)58[483:ROTROT]2.0.CO;2 Article history Received: 01 Jul 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 E. S LARSEN, N. B KEEVIL; RADIOACTIVITY OF THE ROCKS OF THE BATHOLITH OF SOUTHERN CALIFORNIA. GSA Bulletin 1947;; 58 (6): 483–494. doi: https://doi.org/10.1130/0016-7606(1947)58[483:ROTROT]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 Determination of radioactivity has been made on 43 rocks, carefully selected from the different mapped units of the complex Cretaceous batholith of Southern California; they range from gabbro to granite. The activity of the gabbro averages about 0.3 alphas/mg./hr., that of the tonalites, 0.8, the granodiorite 1.3, and the granites over 2.0. The activity of the average rock of the batholith is about 0.9 alphas/mg./hr. Most of the rocks have been analyzed, and modal compositions are given. The radioactivity and the percentages of K2O, SiO2 and PbO are plotted on a variation diagram. The variation curve for activity nearly parallels that for K2O, and the ratio of activity to K2O is about 0.5. The radioactivities of some rocks fall far from the variation curve, and degree of activity correlates with K2O content. A less-marked correlation between activity SiO2 and PbO was also noted. The K2O, SiO2, PbO, and radioactivity concentrate in the residual liquid during crystallization and differentiation. PbO follows K2O closely, as it is concentrated in the K2O minerals, but radioactivity is very low in the K2O minerals and is greatly concentrated in the accessory minerals. 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.