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Despite its ultra-potassic, basic geochemistry (40≤SiO 2 ≤50 wt.%), the Alban Hills Volcanic District was characterized by a highly explosive phase of activity, the Tuscolano–Artemisio phase, which emplaced very large volumes (several tens of km 3 each cycle) of pyroclastic-flow deposits, mafic in composition (SiO 2 ≤45 wt.%) in the time span 600–350 ka. In contrast to the...
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