MassSpecAcademy/U_Pb.qmd at main · EARTHTIME/MassSpecAcademy · GitHub

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# U-Th/Pb {#sec-application-UPb}

A reasonably useful system.

Decay system, dual decay, U isotope list, Pb isotope list, RIP Th-Pb. Conc

## Overview

- ICPMS
    - MC-ICPMS
    - Laser
    - Solution
    - Quad
    - TOF
- TIMS
- SIMS
- Atom probe
- Historical perspectives

## MS selection

- precision
- spatial resolution
- throughput
- type of sample
- volume
- expected age
- budget

## Role of U-Pb in Mass Spec History

SIMS enabled high-n detrital zircons, LA-ICPMS made it cheaper and faster.

## Zircon

- review papers citations (MSA volume has good historical perspective)
- recap of how to do by TIMS and LA-ICPMS and SIMS with references
- The reason we keep TIMSs around.
- Dating young zircons is hard.

## Current limitations and future directions

Specific to instrument development. Ryan's going to break the 10% ionization efficiency barrier soon by TIMS. Caveat for SIMS.

## Other examples: a non-exhaustive list

Apatite (±bio)
Cassiterite
Carbonates
monazite
titanite
rutile
perovskite
zirconolite
baddleyite