single-stage lead Common lead (Pb) removed at a particular time from a single, constantly evolving, uranium—thorium—lead environment. It can be used to provide the basis for the common-lead method of dating (see LEAD-LEAD DATING). After the removal of this lead in solution and its deposition as a lead ore (such as galena), it is then assumed not to have been altered in isotopic composition by the further addition of radiogenic products.
More From encyclopedia.com
Lead , Lead Lead is in column IVA of the periodic table . It has four naturally occurring stable isotopes, lead-204, lead-206, lead-207, and lead-208. The l… Lead Poisoning , Lead is an indestructible heavy metal that can accumulate and linger in the body. Although the problem of lead exposure has been reduced in the Unite… leadwort , plumbago †yellow and red oxides of lead XVII; black lead, graphite XVIII: genus of plants, leadwort XVIII. — L. plumbāgō (i) lead ore, (ii) leadwort,… Periodic Table of the Elements Lead , lead (symbol Pb) Metallic element of group IV of the periodic table, known from ancient times. Its chief ore is galena (lead sulphide), from which le… leading , leading •scaffolding •freestanding, hardstanding, landing, misunderstanding, notwithstanding, outstanding, standing, stranding, understanding, upstan… Uranium-lead Dating , uranium-lead dating All naturally occurring uranium contains 238U and 235U (in the ratio 137.7:1). Both isotopes are the starting points for complex…
About this article
Updated About encyclopedia.com content Print Article
You Might Also Like