Alpha-recoil in U–Pb geochronology: effective sample size matters

  title={Alpha-recoil in U–Pb geochronology: effective sample size matters},
  author={Rolf L. Romer},
  journal={Contributions to Mineralogy and Petrology},
  • R. Romer
  • Published 24 April 2003
  • Geology
  • Contributions to Mineralogy and Petrology
Displacement of the daughter isotope by α-recoil results in an open system on the nanoscale. For a heterogeneous distribution of U and Th, this redistribution of intermediate and stable daughter isotopes results in subvolumes with a deficit of Pb and others with an excess of Pb. Whether such heterogeneities affect the analyzed U–Pb system depends on: (1) the volume of the analyzed sample, (2) the degree and scale of heterogeneity in the U and Th distribution, and (3) the analytical procedure… 

Problems with the U-Pb Radioisotope Dating Methods—2. U and Pb Mobility

Minerals such as zircon are routinely used by geochronologists to confidently provide the U-Pb and Pb-Pb ages which underpin the conventional multi-millions-of-years’ timescale. These dating methods

U-Pb dating of micro-inclusions: The age of the Ehrenfriedersdorf tin deposit (Erzgebirge, Germany)

Multiple reworking of ore deposits may disturb geochronologic systems and eventually render incorrect ages for ore deposition or different stages of ore formation. Micro-inclusions, may beprotected

A century of U-Pb geochronology: The long quest towards concordance

The U-Pb system is a prime geochronometer, mainly due to its occurrence as a pair of isotopically distinct but chemically identical decay systems with 235 U decaying to 207 Pb and 238 U to 206 Pb,

Mobilization of radiogenic Pb in zircon revealed by ion imaging: Implications for early Earth geochronology

Zircon is arguably the most commonly used geochronometer, but the reliability of ages obtained requires a full understanding of processes that might compromise the integrity of its U-Pb systematics.

U-Pb columbite-tantalite chronology of rare-element pegmatites using TIMS and Laser Ablation-Multi Collector-ICP-MS

U-Pb isotopic analyses using TIMS and Laser Ablation-Multi Collector-ICP-MS were carried out on columbite-tantalite minerals from three suites of rare-element (Li, Cs, Ta) pegmatites in the Superior

High Spatial Resolution U-Pb Geochronology and Pb Isotope Geochemistry of Magnetite-Apatite Ore from the Pea Ridge Iron Oxide-Apatite Deposit, St. Francois Mountains, Southeast Missouri, USA

The Pea Ridge iron oxide-apatite (IOA) deposit is one of the major rhyolite-hosted magnetite deposits of the St. Francois Mountains terrane, which is located within the Mesoproterozoic (1.5–1.3 Ga)



U‐Pb geochronology of zircons from lunar breccia 73217 using a sensitive high mass‐resolution ion microprobe

U-Pb ages of four zircons in thin-sections of lunar breccia 73217 have been determined using the sensitive high-resolution ion microprobe, SHRIMP. All crystals show remarkably little loss of

Volume diffusion as a mechanism for discordant lead ages

The discordant U-Pb ages of sixteen minerals having Pb207/Pb206 ages of 2400 to 2700 m.y. closely fit a 2800 to 600 m.y. chord when placed on a pb207/U235-Pb206/U238 diagram. These minerals are from

Erratum to: Metamictisation of natural zircon: accumulation versus thermal annealing of radioactivity-induced damage

Annealing of the radiation damage generated in α-decay events is a common phenomenon in natural zircons. We have studied relationships between radiation damage, age and radionuclide content of