山东五莲山九仙山省级地质公园地质遗迹资源及形成时代--锆石SHRIMP测年的证据

摘要

Wulianshan Jiuxianshangeoparkincludestwoparks.Itisacomprehensivemediumgeoparkthe withavarietyofgeologicalheritageresources.Therearenotonlyrepresentativegeologicalstructuralsectionsanduniquegeologicallandscapes,butalsogeologicaldisasterrelics.Itisidentifiedthatintrusive rocksformedbymagmaintrusioninthecrustformationprocessexistedinwestofJiuxianshanparkin700 millionyearsago.IthasexperiencedintensemetamorphismanddeformationformedbythecollisionofTriassicNorthChinaplateandYangtzeplate,andbelongstotheNeoproterozoicRongchengrockseries.AccordingtozirconSHRIMP U Pbdatingresults,theformationageis799Ma,and metamorphicageis 255Ma.MiddleandeasternpartofJiuxianshanandWulianshanareadamelliteofmiaroliticcavityinLaoshansuperunitinMesozoicearlyCretaceousperiod.Itsformingageis120Ma.%　　五莲山九仙山地质公园,包括2个园区组成,是一个多种地质遗迹资源并存、综合性的中型地质公园.园区内既有代表性的地质构造剖面、独特的地质地貌景观,又有地质灾害遗迹.查明九仙山园区西部保存了7亿年前地壳形成过程中岩浆侵入形成的侵入岩,经历了三叠纪华北板块与扬子板块碰撞而发生强烈的变质变形,属于新元古代荣成岩套,锆石SHRIMPU Pb测年结果,其形成年龄799Ma,变质年龄255Ma；九仙山中东部和五莲山主要为中生代早白垩世崂山超单元晶洞二长花岗岩,形成年龄120Ma.