Figure 1. Weighted mean magmatic ages from zircon U238-Pb206 analyses of submarine and onshore rock samples in the Gulf of California. PIs Kimbrough, Grove, and Lonsdale used ion microprobe and LA-ICPMS techniques to determine the crustal rock ages, plotted on the map as square symbols coloured and scaled on age. Focal mechanisms from the Global CMT catalogue indicate strike-slip motion along the transform faults. Image made with GeoMapApp. All of the data sets shown are accessible through the GeoMapApp menus.

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