As shown, the quadrupole-based mapping approach not only provides age data but also offers valuable quantitative elemental information. This dual capability enhances our understanding of the formation and timing of economically important ore deposits, encompassing even light . (b) blow-up of 87 Sr/ 86 Sr ratios within a short time segment (3 s) within that line scan. Each point within the time-resolved signal corresponds to a single mass sweep (n = 470, for the whole line scan). (c) To obtain 2D maps of 87 Sr/ 86 Sr, 87 Rb/ 86 Sr isotope ratios and ultimately ages, these values were transferred to colored pixel using the viridis color scheme. Figure . Rb-Sr age maps of deformed muscovite from two metapegmatites (GER2B and Wil1A) from the Western Bohemian Massif in NE Bavaria (Germany) consisting mainly of white mica and plagioclase. Different segments have been defined for plagioclase and mica for which isotope and age information is obtained (Tables and). Image pixel size is 3 µm for WIL1A and 4 µm for GER2B. Values adjacent to the black and white circles indicate the single spot ages that have been acquired post mapping. For segments referring to mica, ages and uncertainties (95 % conf.) in Ma are indicated. All ages are with matrix correction based on Harvard 98973 muscovite. Figure . Rb-Sr age map of a mylonitic mica schist (GÄD08) from the Middle Seve Nappe near Ankarede, Jämtland (Sweden) consisting mainly of muscovite, biotite and plagioclase. Image pixel size is 3 µm. Different segments have been assigned for mica and biotite, with segment #1 and #3 comprising all muscovite and biotite pixel, respectively. Segments #2 and #4 comprise a smaller subset. Two segments #5 and #6 are assigned to plagioclase. White circles indicate Rb-Sr ages obtained from single spot analyses with matrix correction based on Harvard 98973. Isotopic and age data for the segments is compiled in Tables and. Figure . Rb-Sr ages of selected mica segments within the Rb-Sr age maps (Figs. ) expressed as either the weighted means (top) or the mean of a Gaussian fit to the age histograms (bottom). The latter have been generated using the Igor Pro software (version 8.04) and applying the Freedman-Daiconis method to calculate the bin width. The ( 87 Sr/ 86 Sr)initial is anchored to the values obtained from plagioclase analyses (Table ). Ages displayed are without matrix correction. Matrix corrected ages are compiled in Table . For WIL1A (segment #1) and GER2B (segment #3) both approaches yield similar means and uncertainties. For GÄD08 segment #3, which comprises all biotite-assigned pixel, the Gaussian mean yields a higher age compared to the weighted mean. This is explained by the presence of anomalously low apparent ages caused by biotite alteration, visible as a shoulder on the lower-age side of the main age peak (f). These ages do not affect the Gaussian fit, whereas they do affect the accuracy obtained by the weighted mean. Figure . Elemental, isotopic, isotope ratio and Rb-Sr age distribution of sample GER2B. All concentration maps have been normalized to Si (see methods section). Hence for Si, only nonnormalized concentrations are shown. The dotted square denotes the location of the transect shown in Fig. . Figure . Distribution of Rb-Sr age and selected elements along a transect perpendicular to the cleavage of the large deformed muscovite crystal displayed in Figs. . Shown are mean values +/-1 SD of all pixel perpendicular to the transect. Blue regions are interpreted of domains affected by fluid-induced age reset. The yellow domain highlights age reset likely cause by dry volume diffusion (see text). The lower and upper age range as constrained by ID-TIMS analyses is indicated by dotted lines. Sr occasionally shows strong enrichment along cleavage planes also visible in the elemental distribution maps in Fig. . Figure . Comparison of matrix corrected Rb-Sr mica ages obtained from the segments defined in Figs. and, matrix corrected Rb-Sr spot ages and expected ages as based on Rb-Sr multimineral isochron data (see section 2.1) All data is based on muscovite analyses, except mapping data for GÄD08, which is based on biotite analyses. Auxiliary gas (l/min) 0.9 0.9 0.9 0.9 0.9 0.9