Palaeoproterozoic tectonothermal evolution and deep crustal processes in the Jiao‐Liao‐Ji Belt, North China Craton: a review
Palaeoproterozoic tectonothermal evolution and deep crustal processes in the Jiao‐Liao‐Ji Belt, North China Craton: a review
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DOI：
10.1002/gj.1282
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发表时间：
2011-11
影响因子：
1.8
通讯作者：
S. Z. Li;Guochun Zhao;M. Santosh;X. Liu;L. Dai
中科院分区：
文献类型：
--
作者：
S. Z. Li;Guochun Zhao;M. Santosh;X. Liu;L. Dai
古元古代胶辽冀带位于北中国克拉通东部地块的东缘。本文根据最新资料，综合了胶辽冀带构造热演化和地壳深部过程。2.53~2.36Ga与地幔柱有关的底侵作用导致了2.47~2.33Ga碱性花岗岩岩体和基性岩墙群的侵位，随后胶辽冀裂谷和双模火山作用的发展。底侵作用不仅导致了上地壳不同的沉积环境，而且导致了裂谷初始热结构的分化。这控制了裂谷不同部位的P-T-t轨迹的变质作用和样式。随后的底侵作用导致约2.17Ga的A型辽集花岗岩侵位于下地壳，并形成2.2和2.0Ga的伴生伟晶岩，并发育顺层平行伸展。主造山作用发生在1.93~1.88Ga之间，南部裂谷闭合，挤压变形，高压麻粒岩变质作用。随后，岩石圈块体可能在∼1.85Ga时拆沉，环斑花岗岩、碱性花岗岩和正长岩等非造山岩浆岩侵入，伟晶岩脉和镁铁质岩墙群侵位贯穿所有早期构造痕迹。深部岩石圈的底侵样式、碰撞过程和拆沉类型控制了胶辽冀地区地壳的构造热演化。版权所有©2011 John Wiley&Sons，Ltd.
The Palaeoproterozoic Jiao‐Liao‐Ji Belt is located in the eastern margin of the Eastern Block of the North China Craton. In this paper, we synthesize the tectonothermal evolution and deep crustal processes in the Jiao‐Liao‐Ji Belt based on recent information. A mantle plume‐related underplating from 2.53 to 2.36 Ga is envisaged which led to the emplacement of the 2.47–2.33 Ga alkali granite plutons and mafic dyke swarms, followed by the development of the Jiao‐Liao‐Ji Rift and bi‐modal volcanism. The underplating resulted not only in different sedimentary environments in the upper crust, but also in a differentiation of the initial thermal structure in the rift. This controlled the metamorphism and style of P‐T‐t paths in the different parts of the rift. Subsequent underplating resulted in the emplacement of the A‐type Liaoji granites of ca. 2.17 Ga in the lower crust, and the formation of associated pegmatites of 2.2 and 2.0 Ga, together with the development of a bedding‐parallel extension. However, the main orogeny occurred between 1.93 and 1.88 Ga with closing of the rift, compressional deformation and high‐pressure granulite metamorphism in the southern part of the orogen. Subsequently, lithospheric blocks were possibly delaminated at ∼1.85 Ga; anorogenic magmatic rocks such as rapakivi granite, alkaline granites and syenite were intruded, and pegmatite veins and mafic dyke swarms were emplaced cross‐cutting all the earlier structural traces. We identify that the underplating styles, collision processes and delamination types in the deep lithosphere controlled the tectonothermal evolution of the crust in the Jiao‐Liao‐Ji region. Copyright © 2011 John Wiley & Sons, Ltd.