香港大学Chao Wang团队研究了古太平洋俯冲开始的入侵模型。相关论文于2025年3月17日发表在《地质学》杂志上。

俯冲起始是构造学中一个备受争议的课题。一些古代板块边缘的重建涉及从不同海洋板块俯冲的传播，这一过程被称为入侵或感染。识别古代俯冲入侵的一个困难是，它可能不会留下独特的记录。研究组提出，二叠纪古太平洋板块沿东亚边缘俯冲的开始与亚洲大陆组装期间东西走向海洋的闭合有关，包括古特提斯洋和古亚洲洋的分支。

该地区俯冲系统的方向和相对时间有俯冲侵入的间接迹象。进一步的证据来自一些西太平洋玄武岩的印度洋/特提斯洋Dupal同位素特征，其历史可以追溯到二叠纪。研究组认为，这种Dupal特征是在二叠纪-三叠纪特提斯洋闭合期间首次转移的，并且来自相对较浅的来源。

附：英文原文

Title: An invasion model for the start of Paleo-Pacific subduction

Author: Mark B. Allen, Shuguang Song, Chao Wang

Issue&Volume: 2025-03-17

Abstract: Subduction initiation is a strongly debated subject in tectonics. Reconstructions of some ancient plate margins involve the propagation of subduction from a different oceanic plate in a process known as invasion or infection. A difficulty in recognizing ancient subduction invasion is that it may not leave a distinctive record. This paper proposes that Permian initiation of Paleo-Pacific Plate subduction along the East Asian margin was linked to the closure of ～east-westtrending oceans during the assembly of the Asian continent, including branches of the Paleo-Tethys Ocean and the Paleo-Asian Ocean. There are circumstantial indications of subduction invasion in the orientations and relative timings of subduction systems in the region. Further evidence comes from the Indian/Tethyan Ocean Dupal isotopic signature of some western Pacific basalts, dating as far back as the Permian. We suggest that this Dupal signature was first transferred during Tethyan Ocean closure in the PermianTriassic, and from a relatively shallow source.

DOI: 10.1130/G53022.1

Source: https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G53022.1/653117/An-invasion-model-for-the-start-of-Paleo-PacificredirectedFrom=fulltext