The late Mesozoic closure of the Mongol‐Okhotsk Ocean (MOO) is critical for understanding the tectonics of East Asia. There is a considerable mismatch (~40 million years) between the timing of MOO closure based on paleomagnetic data and geological evidence. We review paleomagnetic data from Mongolia, Siberia, and North China and argue that previously published apparent polar wander paths (APWPs) for North China and Siberia are insufficient to constrain the timing of MOO closure. Our new analysis incorporates newly published paleomagnetic data from North China and a refined geochronology for the key Siberian poles. We combine this with an updated global APWP incorporating large‐scale Jurassic true polar wander and argue that the MOO was closed by the Middle Jurassic. This temporal shift is compatible with geology‐based models. The Middle Jurassic reconstruction of Eurasia suggests that the East Asian blocks had become a quasi‐rigid part of Pangea prior to breakup.

中文翻译：

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中侏罗世对蒙古鄂霍次克海的封闭：古磁和地质证据的调和

蒙古鄂霍次克海（MOO）的中生代晚期对了解东亚的构造至关重要。根据古磁数据和地质证据得出的MOO封闭时间之间存在相当大的不匹配（约4000万年）。我们回顾了蒙古，西伯利亚和华北地区的古磁数据，并认为先前发布的华北和西伯利亚的明显极地游走路径（APWP）不足以限制MOO封闭的时间。我们的新分析结合了来自华北地区的最新发布的古地磁数据和关键西伯利亚极的精细地质年代学。我们将此与结合了大型侏罗纪真实极地漂移的最新全球APWP相结合，并认为MOO已被中侏罗纪封闭。这种时间上的变化与基于地质的模型兼容。