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1篇 您的检索式:作者名="Jason P.Morgan"
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1Mechanism of progressive broad deformation from oceanic transform valley to off-transform faulting and rifting显示文摘Oceanic transform faults(TFs)are commonly viewed as single,narrow strikeslip seismic faults that offset two mid-ocean ridge segments.However,broad zones of complex deformation are ubiquitous at TFs.Here,we propose a new conceptual model for the progressive deformation within broad zones at oceanic TFs through detailed morphological,seismic,and stress analyses.We argue that,under across-transform extension due to a change in plate motion,plate deformation occurs first along high-angle transtensional faults(TTFs)within the transform valleys.Off-transform normal faults(ONFs)form when across-transform deviatoric extensional stresses exceed the yield strength of the adjacent oceanic lithosphere.With further extension,these normal faults can develop into off-transform rift zones(ORZs),some of which can further develop into transform plate boundaries.We illustrate that such progressive complex deformation is an inherent feature of oceanic TFs.The new conceptual model provides a unifying theory to explain the observed broad deformation at global transform systems.Fan Zhang Jian Lin Zhiyuan Zhou Hongfeng Yang Jason P.Morgan 2022The Innovation2022,3,1:0
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