Nature：大洋转换断层处的拉张构造与两阶段地壳增生( 二 )

Grevemeyer等人的发现和解释更新了我们对大洋转换断层的认知，但其中某些结论仍然有待进一步检验和审视。例如，（1）转换变形区发生的地震主要走滑性质的，并非是张性的（见Ito,2021及其引文）；（2）重力测量显示在慢速扩张洋脊附近洋壳并未增厚（Greggetal.,2007）；（3）相邻洋脊处产出的岩浆如何在外侧形成一系列平行于洋脊的J型脊仍然不清楚。此外，作者也未探讨大洋转换断层如何形成的问题（Gerya,2010,2016）。未来转换断层研究的突破将有赖于更详细的海底观测、更多洋脊附近岩石样品的获取和地球化学分析以及更切实际的动力学模拟研究。
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（撰稿：陈林/岩石圈室）
校对：张腾飞、姜雪蛟