加拿大滑铁卢大学Lijun Wang小组在研究华南扬子板块和华夏地块中取得新进展，称它们在冈瓦纳大陆的不同位置，直到早古生代才发生并置。相关论文于2023年5月30日发表在《地质学》杂志上。

基于对现有古地磁、古生物、地层和碎屑锆石数据的总结和重新评价，研究人员提出扬子板块和华夏地块直到早古生代才并置的观点，在此之前它们是位于冈瓦纳大陆北缘的两个独立部分。在埃迪卡拉纪和早寒武世，扬子板块位于印度西北部，在埃迪卡拉纪，华夏地块接近或属于澳大利亚北部，当时澳大利亚和印度被Kuunga洋分开，并在埃迪卡拉纪晚期至寒武纪早期海洋闭合时与印度东缘合并。

研究模型表明，华南早古生代的造山作用可能与两个不同的事件有关，即埃迪卡拉纪晚期至早寒武世，华夏/澳大利亚与印度的碰撞(Kuunga造山运动)和晚奥陶世华夏地块与扬子板块的合并。这与意味着扬子板块和华夏地块很可能占据了罗迪尼亚的两个不同的位置。

据悉，华南板块在冈瓦纳中的位置仍有争议。在以前所有的模式中，华南板块的两个主要组成部分，扬子板块和华夏地块被Tonian合并，华南板块被认为是冈瓦纳大陆中一个单一的连贯陆块。

附：英文原文

Title: Yangtze and Cathaysia blocks of South China: Their separate positions in Gondwana until early Paleozoic juxtaposition

Author: Lijun Wang, Shoufa Lin, Wenjiao Xiao

Issue&Volume: 2023-05-30

Abstract: The position of South China in Gondwana remains controversial. In all previous models, the Yangtze and Cathaysia blocks, the two major components of South China, were amalgamated by the Tonian, and South China was considered to be a single coherent block in Gondwana. Based on a summary and critical reevaluation of available paleomagnetic, paleontological, stratigraphic, and detrital zircon data, we propose that the Yangtze and Cathaysia blocks were not juxtaposed until the early Paleozoic and were located at two separate parts of the northern margin of Gondwana before that time. The Yangtze block was located to the northwest of India in the Ediacaran and early Cambrian. Cathaysia was close to or a part of northern Australia in the Ediacaran, when Australia and India were separated by the Kuunga Ocean, and amalgamated with the eastern margin of India in the late Ediacaran to early Cambrian when the ocean closed. Our model implies that the early Paleozoic orogenesis in South China could have been related to two distinct events, the late Ediacaran to early Cambrian collision of Cathaysia/Australia with India (the Kuunga orogeny) and the Late Ordovician amalgamation of Cathaysia with Yangtze. It also implies that the Yangtze and Cathaysia blocks likely occupied two separate positions in Rodinia.

DOI: 10.1130/G51362.1

Source: https://pubs.geoscienceworld.org/gsa/geology/article/doi/10.1130/G51362.1/623829/Yangtze-and-Cathaysia-blocks-of-South-China-Their