Research Article| July 01, 1973 Middle Precambrian and Older Apparent Age Values in Basement Gneisses of South Korea, and Relations with Southwest Japan P. M. HURLEY; P. M. HURLEY 1Department of Earth and Planetary Sciences, Massachusetts Institute of Technology Cambridge, Massachusetts 02139 Search for other works by this author on: GSW Google Scholar H. W. FAIRBAIRN; H. W. FAIRBAIRN 1Department of Earth and Planetary Sciences, Massachusetts Institute of Technology Cambridge, Massachusetts 02139 Search for other works by this author on: GSW Google Scholar W. H. PINSON, JR.; W. H. PINSON, JR. 1Department of Earth and Planetary Sciences, Massachusetts Institute of Technology Cambridge, Massachusetts 02139 Search for other works by this author on: GSW Google Scholar J. H. LEE J. H. LEE 2Geological Survey of Korea, 125 Namyong-Dong, Seoul, Korea Search for other works by this author on: GSW Google Scholar Author and Article Information P. M. HURLEY 1Department of Earth and Planetary Sciences, Massachusetts Institute of Technology Cambridge, Massachusetts 02139 H. W. FAIRBAIRN 1Department of Earth and Planetary Sciences, Massachusetts Institute of Technology Cambridge, Massachusetts 02139 W. H. PINSON, JR. 1Department of Earth and Planetary Sciences, Massachusetts Institute of Technology Cambridge, Massachusetts 02139 J. H. LEE 2Geological Survey of Korea, 125 Namyong-Dong, Seoul, Korea Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1973) 84 (7): 2299–2304. https://doi.org/10.1130/0016-7606(1973)84<2299:MPAOAA>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 P. M. HURLEY, H. W. FAIRBAIRN, W. H. PINSON, J. H. LEE; Middle Precambrian and Older Apparent Age Values in Basement Gneisses of South Korea, and Relations with Southwest Japan. GSA Bulletin 1973;; 84 (7): 2299–2304. doi: https://doi.org/10.1130/0016-7606(1973)84<2299:MPAOAA>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 Rb-Sr whole-rock model age dates on Precambrian gneisses in South Korea have values that are greatly scattered owing to lower Mesozoic thermotectonic activity which caused an isotopic homogenization at about 180 m.y. The Rb-Sr data indicate, however, that the general original age of the province was within the range 2,000 ± 500 m.y. This belt is bordered on the southeast by a region invaded by Cretaceous granitic plutons that are approximately 100 m.y. old.This sequence may be correlated with a similar sequence in southwest Japan, proceeding from north to south across the section: 1. A now-submerged source-region for the 2,000-m.y.-old pebbles in the Kamiaso conglomerate; 2. a 200-m.y. metamorphism of the Hida gneiss complex; and 3. a belt of Cretaceous and younger granite plutons. This matching yields an estimate of 2.6° lat as the total southward shift of southwest Japan from a former Precambrian position. This shift almost exactly matches the north-south opening of the Japan Basin, and suggests that the Kita-Yamato Bank and sea floor to the south of it is a submerged platform of 2,000-m.y.-old continental crust. 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.