Final amalgamation of the Central Asian Orogenic Belt in NE China: Paleo-Asian Ocean closure versus Paleo-Pacific plate subduction — A review of the evidence
Final amalgamation of the Central Asian Orogenic Belt in NE China: Paleo-Asian Ocean closure versus Paleo-Pacific plate subduction — A review of the evidence
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DOI：
10.1016/j.tecto.2015.05.006
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发表时间：
2015-11
期刊：
影响因子：
2.9
通讯作者：
S. Wilde
中科院分区：
文献类型：
--
作者：
S. Wilde
从新元古代到晚古生代，中亚造山带经历了古亚洲洋的复杂闭合过程。这导致中国大陆与欧亚大陆碰撞，并导致世界上最大的中生代造山带的形成。封海从西部开始，在东部长春附近完成。中国东北古亚洲洋的闭合是沿着索伦克-萨尔木伦-长春-延吉缝合带进行的，这可能在晚二叠世完成，尽管相关活动一直持续到三叠纪。在二叠纪末-早三叠世，与古亚洲洋闭合相关的终端活动和与古太平洋板块俯冲相关的构造运动发生了重叠。这一地球动力学背景的转换发生在260-250 Ma之间，反映在南北向挤压的松弛和与古太平洋俯冲有关的东西向过程的开始。早侏罗世，与古太平洋板块向西推进有关的事件占主导地位，导致I型花岗岩广泛发育，远至大兴安岭。从~ 140 Ma开始，古太平洋板块向东退缩，导致早白垩世的伸展环境，其影响因岩石圈区域减薄而增强，通常归因于拆沉作用。在这一时期，东亚边缘的构造十分复杂。南北走向的佳木斯-汉卡（-Bureya）地块在晚三叠世从CAOB东缘裂陷，但在侏罗纪因西向俯冲影响地块西缘和东缘而重新联合。在白垩纪，增生杂岩继续沿沿着整个亚洲东缘演化，在~ 130 Ma时纳丹哈达地体（Sikhote-Alin增生杂岩的一部分）与CAOB最终增生，随后S型花岗岩侵位。
The Central Asian Orogenic Belt (CAOB) evolved through complex closure of the Paleo-Asian Ocean from the Neoproterozoic to the late Phanerozoic. This caused the Chinese cratons to collide with Eurasia and led to the formation of the world's largest Phanerozoic orogenic belt. Ocean closure commenced in the west and was completed in the east near Changchun. Closure of the Paleo-Asian Ocean in NE China was along the Solonker–Xar Moron–Changchun–Yanji suture and this was likely completed in the Late Permian, although associated activity continued into the Triassic. There was an overlap in the latest Permian–Early Triassic between terminal activity associated with Paleo-Asian Ocean closure and the onset of tectonism associated with subduction of the Paleo-Pacific plate. This switch in geodynamic setting occurred at ~ 260–250 Ma, and is reflected by a relaxing of north–south directed compression and the onset of east–west directed processes related to Paleo-Pacific subduction. By the Early Jurassic, events associated with the westward advance of the Paleo-Pacific plate dominated, leading to extensive development of I-type granites as far inland as the Great Xing'an Range. From ~ 140 Ma, the Paleo-Pacific plate retreated eastward, resulting in an extensional setting in the Early Cretaceous, the effects of which were enhanced by regional thinning of the lithosphere, commonly attributed to delamination. Throughout this period, the eastern Asian margin was tectonically complex. The north–south oriented Jiamusi–Khanka(–Bureya) block was rifted away from the eastern margin of the CAOB in the Late Triassic, but was then re-united in the Jurassic by westward-advancing subduction that affected both the western and eastern margins of the block. Accretionary complexes continued to evolve in the Cretaceous along the whole eastern margin of Asia, with final accretion of the Nadanhada Terrane (part of the Sikhote–Alin accretionary terrane) with the CAOB at ~ 130 Ma, followed by the emplacement of S-type granites.