中国科学院地质与地球物理研究所孟令通及其课题组成员，利用大陆俯冲引起的移动和置换来改造克拉通岩石圈。2024年2月1日出版的《地质学》杂志发表了这项成果。

中生代早期，华北克拉通(NCC)经历了扬子地块(YB)的大陆深俯冲，研究报道了嵌套在上覆克拉通中扬子地块地壳的存在。结合研究的新结果和以往的观测，研究人员认为在250-220 Ma期间，华北克拉通岩石圈的一个200km长的区域被俯冲的扬子地块推平，导致岩石圈缝合线远离地表缝合带。这种岩石圈的移动发生在中下地壳水平(深度16-20km)——比以前认为的可能要浅得多。

被推平的华北克拉通岩石圈被俯冲的扬子地块大陆岩石圈而不是软流圈补充，从而结束了岩石圈的改造。在深大陆俯冲期间岩石圈基本没有净损失，华北克拉通直到早白垩世古太平洋俯冲之前一直保持稳定。这种“推平和重建”的模型可以解释克拉通在与另一个大陆板块碰撞时如何保持稳定。

据介绍，建立克拉通改造机制对于理解克拉通的稳定性和结构至关重要的。众所周知，大洋俯冲和地幔柱可以破坏和引起上覆克拉通岩石圈的动荡，但大陆俯冲在克拉通改造中的作用尚不清楚。

附：英文原文

Title: Bulldoze and rebuild: Modifying cratonic lithosphere via removal and replacement induced by continental subduction

Author: Lingtong Meng, Yang Chu, Wei Lin, Ross N. Mitchell, Liang Zhao

Issue&Volume: 2024-02-01

Abstract: Establishing the mechanisms for craton modification is critical for understanding cratonic stability and architecture. It is well known that oceanic subduction and mantle plumes can destroy and destabilize the overriding cratonic lithosphere, but the role of continental subduction in craton modification remains unclear. In the North China craton (NCC), which experienced deep continental subduction of the Yangtze block (YB) during the early Mesozoic, we report the presence of the YB crust embedded in the overriding craton. Combining our new results with previous observations, we argue that during 250–220 Ma, a 200-km-long tract of the NCC lithosphere was bulldozed by the subducted YB, resulting in a lithospheric suture far from the suture zone at the surface. This lithospheric removal occurred at middle-lower crustal levels (16–20 km depth)—much shallower than previously thought possible. The bulldozed NCC lithosphere was replenished by the subducted YB continental lithosphere rather than the asthenosphere, thus terminating the lithosphere modification. With essentially no net loss of lithosphere during deep continental subduction, the NCC maintained its stability until Early Cretaceous paleo-Pacific oceanic subduction. This “bulldoze and rebuild” model can thus account for how a craton maintains stability during a collision with another continental plate.

DOI: 10.1130/G51766.1

Source: https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G51766.1/633911/Bulldoze-and-rebuild-Modifying-cratonicredirectedFrom=fulltext