This includes the analysis of usually small detrital mica grains, which is a promising approach for sedimentary provenance analysis. Another notable strength of Rb-Sr mapping lies in its capacity to identify and pool homogeneous age populations, which is essential for meaningful weighted mean age determinations. This is particularly important, given the presence of sharp intracrystalline age gradients (~100 Ma over 20-30 µm) and larger domains displaying partial age reset. These µmscale age variations align with the discovery of multiple age populations in natural biotite, as observed within the transient signal during a standard single spot ablation interval. While increasing the segment size of a particular age population improves the weighted mean uncertainty, the obtainable total uncertainty of the Rb-Sr age is limited by the propagation of the uncertainty of the initial Sr correction and the systematic uncertainties. In this respect, the availability of matrix-matched, homogeneous, and well characterized RM as well as an accurate and precise determination of the initial 87 Sr/ 86 Sr is crucial. Furthermore, it is imperative to ensure a P/A match for mass-shifted Sr-ions, given the absence of a viable software-based P/A tuning method, unlike the case with 85 Rb. Developing alternative routines for P/A factor determination and correction for P/A mismatch will advance analytical accuracy and precision.