Chemical abrasion applied to SHRIMP zircon geochronology: An example from the Variscan Karkonosze Granite (Sudetes, SW Poland)

► A chemical abrasion technique can be applied to U-Pb zircon SHRIMP geochronology. ► This is illustrated using U-rich zircons from the Karkonosze Granite, SW Poland. ► Untreated zircons give 306 ± 4 Ma while CA zircons give 322 ± 3 Ma (206Pb/238U ages).