美国卡尔顿大学Annabel F. Jay团队揭示了阿曼位于宽广的东莫三比克海的北部边缘。这一研究成果于2025年8月20日发表在《地质学》杂志上。

莫桑比克海的闭合确定了冈瓦纳大陆的最终组装，并与阿拉伯-努比亚地盾的一个巨大的地壳生长区域有关。尽管处于古地理的中心位置，但在莫桑比克海洋内部和海洋边界的地体位置几乎没有限制。

研究组报告了古地磁数据，即阿曼南部726英里的堤坝暴露。通过对上覆的深寒系二晶岩中基性碎屑的砾岩试验，确定了磁铁矿的主要磁化作用。由此得出的古磁极表明，阿曼的古纬度为37±2.5°N，与现在的方向逆时针旋转了约80°。这一位置与阿曼与印度和华南克拉通在莫桑比克洋北缘形成一个从阿拉伯-努比亚弧向南的独特构造域相一致。该位置显示了一个约5500公里宽的海洋领域，随后关闭，形成了新元古代的主要生长期。

附：英文原文

Title: Oman was on the northern margin of a wide late Tonian Mozambique Ocean

Author: Nicholas L. Swanson-Hysell, Yiming Zhang, Francis A. Macdonald, Isabel Koran, Adrian R. Tasistro-Hart, Annabel F. Jay

Issue&Volume: 2025-08-20

Abstract: The closure of the Mozambique Ocean defines the final assembly of the megacontinent Gondwana and is associated with a vast region of crustal growth in the Arabian-Nubian Shield. Despite this central paleogeographic position, there are few constraints on the position of terranes within and bounding the Mozambique Ocean. We report paleomagnetic data from ca. 726 Ma dikes exposed in southern Oman. Well-resolved magnetite magnetization is constrained to be primary by a conglomerate test on mafic clasts within overlying Cryogenian diamictite. The resulting paleomagnetic pole indicates that Oman was at a paleolatitude of 37 ± 2.5°N and was rotated ～80° counterclockwise from its present-day orientation. This position is consistent with Oman forming a contiguous plate with the India and South China cratons on the northern margin of the Mozambique Ocean in a distinct tectonic domain from Arabian-Nubian arcs to the south. This position reveals an ～5500-km-wide oceanic realm prior to subsequent closure that resulted in a major zone of Neoproterozoic crustal growth.

DOI: 10.1130/G53450.1

Source: https://pubs.geoscienceworld.org/gsa/geology/article-abstract/doi/10.1130/G53450.1/660705/Oman-was-on-the-northern-margin-of-a-wide-lateredirectedFrom=fulltext