苏鲁造山带南缘基础地质研究进展  

Progresses of Fundamental Geological Resea rch in the South Margin of Su-Lu Orogenic Belt

作　　者：潘明宝[1] 陈火根[2] 王浩[2] 陈守矩[2] 杜建国[2] 贾根[2] 

机构地区：[1]南京大学地球科学系,江苏南京210093 [2]江苏省地质调查研究院,江苏南京210018

出　　处：《江苏地质》2003年第1期1-11,共11页Jiangsu Geology

摘　　要：苏鲁造山带南缘发育的超高压变质成因的榴辉岩带是整个中国中部造山带折返抬升最高部位 ,具有较典型的造山带根部特征。通过区域地质调查工作 ,查明区内发育岩石地层有新太古代至古元古代东海岩群、中新元古代锦屏岩群和云台岩群 ,呈一系列北东向和近东西向构造岩块分布 ,岩石中密集发育晋宁期韧性推覆剪切带和右形走滑韧性剪切带 ,后期普遍为印支期滑脱韧性剪切带叠加 ,形成复杂的韧性剪切系统 ,是阜宁期华北板块南缘地体拼贴B型俯冲碰撞作用、晋宁期华北板块与扬子板块软碰撞作用和印支期扬子板块向华北板块之下A型俯冲碰撞作用的结果。Located in the highest position of exhumation and uplifting in the whole central orogenic belt——Qinling Dabie and Su Lu orogenic belt in China,the eclogite belt with ultra high pressure metamorphism and well distributed in the south margin of Su Lu orogenic belt i s characteristic of more representative root of orogenic belt. regional survey s hows that well developed and metamorphosed strata in the area consist of Dongha i rock group of New Archean Paleo Proterozoic,Jinping rock group and Yuntai ro ck group of Meso Neoproterozoic. Those are distributed by a series of structura l rock blocks with the direction of NE and near EW. The main complex ductile she ar system can be divided into three stages:the first is thrust ductile shear def ormation formed in Jinning period,the second is right handed strike ductile sh ear deformation formed in late Jinning period,and the third is detachment ducti le shear deformation formed in Indosinian period. So,there exists the docking a ccretion of the Jiaonan Subei terrain by B type subduction in the south margin of the north China plate in Funing period,soft collision between the north Chi na plate and Yangtze plate in Jinning period,and A type collision of the Yangt ze plate subducted beneath the north China plate in Indosinian period. [WT5HZ]

关 键 词：基础地质 变质构造 变质地层 苏鲁造山带 江苏 碰撞作用 

分 类 号：P542.2[天文地球—构造地质学]