推土与重建:通过大陆俯冲引起的移除和置换改变板块岩石圈

Geology Pub Date : 2024-02-01 DOI:10.1130/g51766.1
Lingtong Meng, Y. Chu, Wei Lin, Ross N. Mitchell, Liang Zhao
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引用次数: 0

摘要

建立克拉通改造机制对于了解克拉通的稳定性和结构至关重要。众所周知,大洋俯冲和地幔羽流可以破坏和颠覆压覆的克拉通岩石圈,但大陆俯冲在克拉通改造中的作用仍不清楚。在中生代早期经历了长江块体深大陆俯冲的华北克拉通(NCC),我们报告了长江块体地壳嵌入俯冲克拉通的情况。结合新的研究结果和之前的观测,我们认为在250-220Ma期间,长达200公里的南昌岩石圈被俯冲的YB推挤,形成了一条远离地表缝合带的岩石圈缝合线。岩石圈的移除发生在地壳中下层(16-20 千米深)--比以前认为的要浅得多。NCC岩石圈被推平后由俯冲的YB大陆岩石圈而非星体层补充,从而终止了岩石圈的改造。由于在深部大陆俯冲过程中岩石圈基本上没有净损失,北西大陆架在早白垩世古太平洋大洋俯冲之前一直保持稳定。因此,这种 "推土与重建 "模型可以解释克拉通如何在与另一大陆板块碰撞时保持稳定。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Bulldoze and rebuild: Modifying cratonic lithosphere via removal and replacement induced by continental subduction
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.
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