山东省前寒武纪地质及地质公园地质特征概述

Precambrian geology and geoparks in Shandong province,China

山东前寒武纪地层主要为出露于鲁西地区新太古代泰山岩群、沂水岩群、新元古代土门群和鲁东地区新太古代胶东岩群、古元古代荆山群、粉子山群、中元古代芝罘群、新元古代蓬莱群和胶南-威海造山带古元古代变质表壳岩组合、中元古代五莲群。山东前寒武纪侵入岩主要为出露于鲁西地区新太古代三期侵入岩,每期岩浆侵入活动开始都有地幔岩浆侵入。早期构造岩浆活动主要形成~2700 Ma的英云闪长质片麻岩、条带状英云闪长质片麻岩;中期构造岩浆活动主要形成2630~2600 Ma的TTG质岩石;晚期地幔岩浆活动形成峄山序列TTG质花岗岩,地壳深熔形成傲徕山序列二长花岗岩,表现为大规模陆壳的形成和壳内再循环。鲁东地区中太古代形成~2900 Ma的英云闪长质片麻岩、奥长花岗质片麻岩,新太古代早期形成规模较大的~2700 Ma(条带状)英云闪长质片麻岩,新太古代晚期形成~2500 Ma的TTG质花岗岩及二长花岗岩;古元古代晚期形成二长花岗岩、超基性-基性岩;新元古代在苏鲁造山带形成超基性-基性岩、英云闪长质-花岗闪长质-二长花岗质片麻岩。山东省以新太古代地质体为依托的地质公园主要分布在鲁西地区,主要有泰山、蒙山、峄山、鲁山、济南水帘峡、泰安长城岭、泰安龙湾、肥城牛山、临朐沂山、莱芜房干九龙大峡谷、新泰青云山、泗水龙门山、滕州莲青山、枣庄市山亭区店子、曲阜石门山等地质公园。山东省以元古宙地质体为依托的地质公园主要有长岛、五莲山-九仙山国家地质公园,临沂临港甲子山、威海刘公岛、烟台昆嵛山等省级地质公园及莒县浮来山地质遗迹保护区。

Precambrian strata in the Shandong Province include the Neoarchaean Taishan Group Complex and Yishui Group Complex,the Neoproterozoic Tumen Group distributing in the Western Shandong Province,the Neoarchaean Jiaodong Group Complex,the Paleoproterozoic Jingshan Group and Fenzishan Group,the Mesoproterozoic Zhifu Group,the Neoproterozoic Penglai Group in the Eastern Shandong Province,and the Paleoproterozoic metamorphic supracrustal rock assemblage and the Mesoproterozoic Wulian Group in the Jiaonan-Weihai Orogen.The Precambrian intrusive rocks in the Shandong Province are mainly the three phase Neoarchaean intrusive rocks outcropped in the western Shandong Province,starting from mantle-source magma for each phase.The early phase tectono-magmatism resulted in the intrusion of protoliths of the~2700 Ma tonalitic gneiss,banded tonalitic gneiss.The middle phase tectono-magmatism is dominated by the 2630~2600 Ma trondhjemite-tonalite-granodiorite suite.The late phase mantle-sourced magmatism produced the Yishan Series trondhjemite-tonalite-granodiorite suite;the crustal anatexis produced the Aolaishan Series monzonitic granite,leading the formation of a large scale continental crust.There occurred 2900 Ma(Mesoarchaean)tonalitic gneiss and trondhjemitic gneiss in the eastern Shandong Province,relatively a large scale 2700 Ma(early Neoarchaean)tonalitic gneiss,banded tonalitic gneiss,2500 Ma(late Neoarchaean)trondhjemite-tonalitegranodiorite suite and monzonitic granite,the late Paleoproterozoic monzonitic granite and ultramafic-mafic rocks.In the Su-Lu Orogen of the eastern Shandong Province,there occurred the Neoproterozoic ultramaficmafic rocks and the tonalitic-granodioritic-monzonite-granitic gneiss.The geoparks characterized by the Archaean geology are mainly distributed in the western Shandong Province,including the geoparks of Mount Tai,Mount Meng,Mount Yi,Mount Lu and the Shuilianxia Canyon in Jinan,Changchengling Range and Longwan Bay in Taian,Mount Niu in Feicheng,Mount Yi in Linqu,Fangganjiulong Canyon in Laiwu,Mount Qingyun in Xintai,Mount Longmen in Sishui,Mount Lianqing in Qingzhou,Dianzi in Shanting District of Zaozhuang,Mount Shimen in Wufu,etc.The geoparks marked by the Proterozoic geology in the Shandong Province include the national geoparks of the Changdao island and the Mounts Wulian-Jiuxian,the provincial geoparks of the Mount Jiazi of Lingang in Linyi,Liugong Island in Weihai and Mount Kunyu in Yantai,and the Mount Fulai Geoheritage Protection Area in Ju county.