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ThecarliestMiddleProterozoicmarkedthebeginningofaqualitativclynewstapeintheEarth’shistory,thatofptimarytectonomagmaticactivity(orproto-activity)whichstronglytcworkedoldercratons,shieldsandplatforms.Theactivitywasevidentinalmostallthecontinentsandspannedab