简介：Dikeswarmsaregenerallyascribedtointrusionofmantle-sourcemagmaresultfromextension.BasicdikeswarmsaroundtheShanxi-Hebei-InnerMogoliabordersinthenorthernperipheralareaoftheNorthChinaCratoncanbedividedintofiveagegroupsaccordingtoisotopicdating:1800-1700Ma,800-700Ma,230Ma,140-120Ma,and50-40Ma.Geological,petrologicalandisotopegeochemicalfeaturesofthefivegroupsisinvestigatedinordertoexplorethevariationofthemantlematerialcompositionintheconcernedareawithtime.AndthevariousextensionalactivitiesreflectedbythefivegroupsofdikeswarmsarecomparedwithsomeimportanttectoniceventswithintheNorthChinaCratonaswellasaroundtheworldduringthesameperiod.
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