SHRIMP ZIRCON AGES AND PETROLOGY OF LOWER CRUSTAL GRANULITE XENOLITHS FROM THE LETSENG-LA-TERAE KIMBERLITE, LESOTHO: FURTHER EVIDENCE FOR A NAMAQUA-NATAL CONNECTIONстатья из журнала
Аннотация: Research Article| December 01, 2013 SHRIMP ZIRCON AGES AND PETROLOGY OF LOWER CRUSTAL GRANULITE XENOLITHS FROM THE LETSENG-LA-TERAE KIMBERLITE, LESOTHO: FURTHER EVIDENCE FOR A NAMAQUA-NATAL CONNECTION H. SOMMER; H. SOMMER Corresponding author: School of Geography, Earth Science and Environment, The University of the South Pacific, Laucala Campus, Suva, Fiji Islands, e-mail: info@holgersommer.de Search for other works by this author on: GSW Google Scholar Y. WAN; Y. WAN Institute of Geology and Beijing SHRIMP Centre, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, Beijing 100037, China, e-mail: wanyusheng@bjshrimp.cn Search for other works by this author on: GSW Google Scholar A. KRÖNER; A. KRÖNER Institute of Geology and Beijing SHRIMP Centre, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, Beijing 100037, China, Institut für Geowissenschaften, Universität Mainz, D-55099 Mainz, Germany, e-mail: kroener@uni-mainz.de Search for other works by this author on: GSW Google Scholar H. XIE; H. XIE Institute of Geology and Beijing SHRIMP Centre, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, Beijing 100037, China, email: rock@bjshrimp.cn Search for other works by this author on: GSW Google Scholar D.E. JACOB D.E. JACOB Department of Earth and Planetary Science, Macquarie University, North Ryde, NSW 2109, Australia, e-mail: dorrit.jacob@mq.edu.au Search for other works by this author on: GSW Google Scholar South African Journal of Geology (2013) 116 (2): 183–198. https://doi.org/10.2113/gssajg.116.2.183 Article history first online: 09 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 H. SOMMER, Y. WAN, A. KRÖNER, H. XIE, D.E. JACOB; SHRIMP ZIRCON AGES AND PETROLOGY OF LOWER CRUSTAL GRANULITE XENOLITHS FROM THE LETSENG-LA-TERAE KIMBERLITE, LESOTHO: FURTHER EVIDENCE FOR A NAMAQUA-NATAL CONNECTION. South African Journal of Geology 2013;; 116 (2): 183–198. doi: https://doi.org/10.2113/gssajg.116.2.183 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 SocietySouth African Journal of Geology Search Advanced Search Abstract Recrystallized zircons extracted from intermediate granulites of the Letseng-la-Terae Diamond Mine in northeastern Lesotho provide evidence that the Tugela Terrane of the Mesoproterozoic high-grade Namaqua-Natal mobile belt may extend ~200 km farther west than previously thought. The rock-forming minerals in the investigated lower crustal granulites contain garnet, clinopyroxene, plagioclase and quartz or garnet, wollastonite, plagioclase and quartz. Calculated values for peak granulite-facies metamorphism are ~13 kbar and ~850°C. Thermal overprint and therein granulite-facies metamorphism occurred during the late Mesoproterozoic and is documented by SHRIMP metamorphic zircon ages of 1018 ± 18, 1126 ± 10 and 1127 ± 6 Ma. These ages are in good agreement with the timing of other events in the Namaqua-Natal belt. High-grade metamorphism was probably caused by crustal thickening resulting from continent-arc collision, followed by underplating of hot mantle melts. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Год издания: 2013
Издательство: Geological Society of South Africa
Источник: South African Journal of Geology
Ключевые слова: Geological and Geochemical Analysis, earthquake and tectonic studies, High-pressure geophysics and materials
Открытый доступ: closed
Том: 116
Выпуск: 2
Страницы: 183–198