of Crustal strain-dependent serpentinisation in the Porcupine Basin, offshore Ireland
of Crustal strain-dependent serpentinisation in the Porcupine Basin, offshore Ireland
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发表时间：
2017
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通讯作者：
M. Prada;L. Watremez;Chen Chen-Chen;M. Brian;T. Minshull;T. Reston;P. Shannon;D. Klaeschen;G. Wa
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作者：
M. Prada;L. Watremez;Chen Chen-Chen;M. Brian;T. Minshull;T. Reston;P. Shannon;D. Klaeschen;G. Wa
16 Mantle hydration (serpentinisation) at magma-poor rifted margins is thought to play a key role in 17 controlling the kinematics of low-angle faults and thus, hyperextension and crustal breakup. 18 However, because geophysical data principally provide observations of the final structure of a margin, 19 little is known about the evolution of serpentinisation and how this governs tectonics during 20 hyperextension. Here we present new observational evidence on how crustal strain-dependent 21 serpentinisation influences hyperextension from rifting to possible crustal breakup along the axis of 22 the Porcupine Basin, offshore Ireland. We present three new P-wave seismic velocity models that 23 show the seismic structure of the uppermost lithosphere and the geometry of the Moho across and 24 along the basin axis. We use neighbouring seismic reflection lines to our tomographic models to 25 estimate crustal stretching (β c ) of ~2.5 in the north at 52.5 o N and > 10 in the south at 51.7 o N. These 26 values suggest that no crustal embrittlement occurred in the northernmost region, and that
