【摘要】 中亚造山带东段位于西伯利亚和华北克拉通之间，经历了多构造体系叠加和多旋回洋陆转换的复杂演化过程，目前大量研究均以构造带为核心来限定区域构造格局，但一直争议较大。本文以构造单元的构造属性及其形成过程为主线，结合区域构造带演化，重新厘定了中国东北地区基本构造格局，建立了中国东北山弯构造演化模型。研究表明，古生代时期中国东北地区的主要构造单元由两个具前寒武纪基底的古老地块——额尔古纳地块和佳木斯地块及其张广才岭陆缘弧与两个古生代增生地体——兴安增生地体和松辽增生地体组成，其间由古亚洲洋分支新林-喜桂图洋、贺根山-嫩江洋、龙凤山洋和索伦洋分割。早古生代，西部额尔古纳地块东南部为西太平洋型活动陆缘，发育有嘎仙-吉峰-环宇洋内弧和头道桥等洋岛，～500 Ma随着新林-喜桂图洋的关闭，这些洋内弧和洋岛拼贴增生至额尔古纳地块东南缘。随后贺根山-嫩江洋的俯冲和后撤形成了一系列沟-弧-盆体系，持续的俯冲导致弧陆碰撞和陆缘增生，形成兴安增生地体的主体。同时，东部佳木斯地块西侧发育有龙凤山洋的安第斯型俯冲活动陆缘，形成了张广才岭陆缘弧。伴随着各大洋的俯冲和陆缘增生，额尔古纳地块和佳木斯地块以及它们的陆缘增生带构成了一个早古生代近东西向展布的地块链。南部以锡林浩特-龙江微地块为核心发生陆缘俯冲，形成松辽增生地体雏形。索伦洋发生双向俯冲，并通过弧陆碰撞产生陆缘增生。晚古生代，伴随着古亚洲洋的北向俯冲和后撤，早期形成的地块链逐渐发生向南弯曲。二叠纪末期—中三叠世古亚洲洋俯冲消减闭合以及西北部蒙古-鄂霍茨克洋和东部泛大洋的俯冲挤压，导致地块链进一步弯曲，同时，早期的古老地块、增生地体、弧岩浆岩、沉积建造等发生汇聚，最终形成一个以额尔古纳地块和兴安增生地体为西翼，佳木斯地块和张广才岭陆缘弧为东翼，松辽增生地体为核心的大规模山弯构造——中国东北山弯构造。更多还原

【Abstract】 The eastern Central Asian Orogenic Belt(CAOB), which located between Siberia Craton to the north and North China Craton to the south, has experienced complex evolutionary history of superposition of multi-tectonic domains and multi-cycle ocean-continental transition. Nowadays, majority of research try to reconstruct regional tectonic framework based on the main tectonic belts, however, there are always many controversial problems due to the uncertain positions and timing of the tectonic belts. This study focused on nature and formation process of main tectonic units, combining with evolution of regional tectonic belts, to redefine the basic tectonic framework of NE China, and establishing the pattern and evolutionary history of NE China Orocline. Our research shows that NE China region composed by two ancient blocks, Erguna and Jiamusi-Khanka blocks with Precambrian basements, and two accretionary terranes, Xing’an and Songliao accretionary terranes that formed by Paleozoic subduction-accretion process. These units were seperated by Xinlin-Xiguitu, Hegenshan-Nenjiang, Longfengshan and Solonker oceans. In the Early Paleozoic the SE Erguna block in the western NE China region was featured by “Western Pacific type” active continental margin, forming intra-oceanic arc of Gaxian-Jifeng-Huanyu and Toudaoqiao oceanic island, which together accreted to SE margin of Erguna block due to the closure of the Xinlin-Xiguitu Ocean at ca. 500 Ma. The following continuously retreat subduction of Hegenshan-Nenjiang oceanic lithosphere formed series of trench-arc-basin systems. The continuing collisions of the arc-continent led significant continental accretion to form the main parts of the future Xing’an accretionary terrane(XAT). Meanwhile, the west margin of Jiamusi block in eastern NE China region experienced “Andean type” subduction of Longfengshan oceanic lithosphere, forming Zhangguangcailing continental marginal arc(ZCMA) correspondingly. As a result, a huge west-to-east Early Paleozoic continental chain had been constructed by Erguna and Jiamusi blocks and their accretionary margins. In the south the subduction and accretion around Xilinhot and Longjiang ancient micro-continental fragments produced the primitive Songliao accretionary terrane(SAT). In the Late Paleozoic era, the Early Paleozoic continental chain experienced large scale rotation and bending due to the northward subduction and rollback of the Solonker ocean. During late Permain-middle Triassic the continental chain was further bulcked by both the subduction and rollback of Solonker ocean and the subduction compression of Mongol-Okhotsk Ocean and Panthalassa. The blocks, accretionary terranes, magmatic arcs and sediments were amalgamated and bended to form a huge NE China Orocline, with Erguna block and XAT as its western limb, Jiamusi block and ZCMA as its eastern limb, and SAT in the core.更多还原