Calcareous‐pelagic input sediments are present at several subduction zones and deform differently to their siliciclastic counterparts. We investigate deformation in calcareous‐pelagic sediments drilled ~20 km seaward of the Hikurangi megathrust toe at Site U1520 during IODP Expeditions 372 and 375. Clusters of normal faults and subhorizontal stylolites in the sediments indicate both brittle faulting and viscous pressure solution operated at 150°C where frictional (possibly seismic) slip likely predominates.

中文翻译：

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新西兰 Hikurangi 边缘向海远洋沉积物中的混合脆性和粘性应变定位

钙质-远洋输入沉积物存在于几个俯冲带，其变形与硅质碎屑沉积物不同。我们调查了在 IODP 探险 372 和 375 期间，在 U1520 站点的 Hikurangi 巨冲断趾向海约 20 公里处钻探的钙质-远洋沉积物的变形。沉积物中的正断层和亚水平缝合线簇表明脆性断层和粘性 15° 压力解决方案C 摩擦（可能是地震）滑动可能占主导地位。