The round columnar joints show that the dyke swarms are in upper crust brittle tectonic setting , and the western shandong block is brittle extensional in the mesoproterozoic time 岩墙发育圆柱状节理表明岩墙侵位时地块已经处于上地壳脆性构造环境,中元古代鲁西地区是一个脆性伸展的大地构造环境。
Qinglong fault zone evolved successively by phases in a long term : it probably formed in the late period of paleoproterozoic and rejuvenated in a large scale during jurassic and cretaceous 青龙断裂带形成时间早，演化过程具长期性、阶段性和继承性特点，断裂带可能形成于早元古代末期，侏罗纪?白垩纪时，断裂带大规模复活，右行走滑作用为主要活动机制。
The petrology revelas that the sedimentary environment of the study area is carbonate tide - flat and shallow sea which is also strongly affected by the volcanic materials and wind - brought clastics during the period of yangzhuang 上述岩石特徵表明，研究区在中元古代蓟县纪早期的杨庄期为浅海潮坪碳酸盐沈积环境，沈积作用受中远源火山物质和风携碎屑的强烈影响。
( 3 ) jianchaling ultrabasic intrusion belongs to magnesian ultrabasic simple rock - body , close related with yangzi block in space , which formed in the interim of proterozoic active tectonic zone to phanerozoic orgenic belt ( 3 )证实煎茶岭超基性岩体为含铁的镁质超基性单式岩体，空间上与扬子地块关系密切，形成于新元古代由元古宙活动带向显生宙造山带过渡时期。
Compared with jianchaling nickel sulflde deposit , jinchuan superlarge copper - nickel sulflde deposit mostly related with mafic - ultramafic complex that multiple intruded , spatially respected with old huabei block , which formed in marginal rift in middle - new proterozoic 与煎茶岭镍矿床相比，金川超大型镍铜硫化物矿床主要与多次侵入的镁铁?超镁铁质杂岩有关，空间上与时代相对较老的华北地块关系密切，形成于中?新元古代的边缘裂谷。
Integrated with other late paleoproterozoic granitoids within the central tectonic zone , it indicates that there was a tectonic transitional process from extension to compression during late paleroproterozoic in the southern segment of the central zone of ncc 岩石学和地球化学研究表明王家会花岗岩属于后碰撞花岗岩，结合区域上古元古代地质特征，表明华北克拉通中部带南段古元古代晚期的花岗岩构成了与正常造山过程花岗岩浆演化相反的序列。
All of the abovementioned facts suggest that the neoproterozoic diabases from the xuzhou area of the north china block were derived from nd isotopically - depleted mantle sources with variable enrichment in fertile components and produced through variable degrees of melting at different p - t conditions 结合新元古代全球rodinia超大陆裂解事件及其岩浆活动与地幔柱的密切关系，徐州地区晚元古代辉绿岩墙群为地幔柱作用在华北陆块边缘的记录。
It agrees with the fact that the gabbro is intruded by late ordovician granitic pluton . the pre - sinian basement strata exposed in the north kunlun massif are later archean - neoproterozoic milan group , changcheng system kaqiang group , jixian system liushui formation and qingbaikou system sulu formation 被蛇绿岩所分隔的昆北地块上出露的前震旦纪基底地层为：晚太古代-新元古代米兰岩群，长城系卡羌岩群，蓟县系流水岩组和青白口系丝路岩组。
Four tectonic evolution phases have been made out in this area . they are original crust formed in the archean - early proterozoic era , continental crust shearing in the middle - new proterozoic era , plate tectonic developed in sinian - triassic period and intracontinental orogeny in the middle cenozoic period 将区内构造演化归纳为太古?早元古代原始地壳形成、中新元古代大陆地壳裂解、震旦?三叠纪板块构造体制、中新生代陆内造山等四个演化阶段。
These mafic dykes may provide some important insights about the mantle processes at ca . 1800 - 1700 ma and their geodynamic implications . unfortunately , more attention has been paid to palaeomagnetic , petrologic , lithochemical and k - ar geochronological studies of these mafic dykes 该论文现在对作为华北陆块早元古代基性岩墙群重要组成部分的南太行山地区基性岩脉开展了较为系统的年代学、元素和同位素研究，以期为理解华北陆块1800ma构造背景提供新的资料。
