Research Article| January 01, 2003 Timescales of Magma Chamber Processes and Dating of Young Volcanic Rocks Michel Condomines; Michel Condomines Laboratoire Dynamique de la Lithosphère (LDL, UMR CNRS 5573) et ISTEEM, Université Montpellier 2, place Eugène Bataillon, 34095 Montpellier cedex 5, France Search for other works by this author on: GSW Google Scholar Pierre-Jean Gauthier; Pierre-Jean Gauthier Laboratoire Magmas et Volcans (LMV, UMR CNRS 6524), 5 rue Kessler, 63038 Clermont-Ferrand Cedex, France Search for other works by this author on: GSW Google Scholar Olgeir Sigmarsson Olgeir Sigmarsson Laboratoire Magmas et Volcans (LMV, UMR CNRS 6524), 5 rue Kessler, 63038 Clermont-Ferrand Cedex, France Search for other works by this author on: GSW Google Scholar Reviews in Mineralogy and Geochemistry (2003) 52 (1): 125–174. https://doi.org/10.2113/0520125 Article history first online: 03 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 Michel Condomines, Pierre-Jean Gauthier, Olgeir Sigmarsson; Timescales of Magma Chamber Processes and Dating of Young Volcanic Rocks. Reviews in Mineralogy and Geochemistry 2003;; 52 (1): 125–174. doi: https://doi.org/10.2113/0520125 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 SocietyReviews in Mineralogy and Geochemistry Search Advanced Search One of the initial goals of measuring U-series disequilibria in young volcanic rocks was the development of new dating methods in an age range (about 0–300 ka), where few other methods were applicable at that time (Cerrai et al. 1965; Cherdyntsev et al. 1967; Kigoshi 1967; Taddeucci et al. 1967; Allègre 1968). In the following years, several studies showed that the 238U-230Th method, the first to be applied, was indeed able to give reliable ages on rocks from various volcanoes (e.g., Allègre and Condomines 1976; Condomines et al. 1978).... You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Short-lived decay products of uranium and thorium have half-lives and chemistries sensitive to the processes and time scales of magma genesis, including partial melting in the mantle and magmatic differentiation in the crust. Radioactive disequilibrium between 238 U, 230 Th, and 226 Ra is widespread in volcanic rocks. These disequilibria and the isotopic composition of thorium depend especially on the extent and rate of melting as well as the presence and composition of vapor during melting. The duration of mantle melting may be several hundred millennia, whereas ascent times are a few decades to thousands of years. Differentiation of most magmas commonly occurs within a few millennia, but felsic ones can be tens of millennia old upon eruption.
Research Article| April 01, 1997 Dating recent volcanic rocks through 230Th-238U disequilibrium in accessory minerals: Example of the Puy de Dôme (French Massif Central) Michel Condomines Michel Condomines 1Centre de Recherches Volcanologiques, Université Blaise Pascal et Centre National de la Recherche Scientifique (URA10), 5 rue Kessler, 63038 Clermont-Ferrand Cedex, France Search for other works by this author on: GSW Google Scholar Geology (1997) 25 (4): 375–378. https://doi.org/10.1130/0091-7613(1997)025<0375:DRVRTT>2.3.CO;2 Article history first online: 02 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 Michel Condomines; Dating recent volcanic rocks through 230Th-238U disequilibrium in accessory minerals: Example of the Puy de Dôme (French Massif Central). Geology 1997;; 25 (4): 375–378. doi: https://doi.org/10.1130/0091-7613(1997)025<0375:DRVRTT>2.3.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 SocietyGeology Search Advanced Search Abstract Precise dating of very young (≤10 000 yr) silicic volcanic rocks can be achieved by measurements of 230Th-238U disequilibria in accessory minerals such as apatite and zircon. It is illustrated here by the isochron age of 12 000 ± 1000 yr obtained on a trachyte from the Puy de Dôme (French Massif Central). The crystallization age is virtually the same as the eruption age determined by thermoluminescence and 14C dating. This indicates a short time interval (a few centuries at most) between crystallization and eruption in such small volume silicic magmas. 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.
