Abstract:
:Abyssal-hill-bounding faults that pervade the oceanic crust are the most common tectonic feature on the surface of the Earth. The recognition that these faults form at plate spreading centres came with the plate tectonic revolution. Recent observations reveal a large range of fault sizes and orientations; numerical models of plate separation, dyke intrusion and faulting require at least two distinct mechanisms of fault formation at ridges to explain these observations. Plate unbending with distance from the top of an axial high reproduces the observed dip directions and offsets of faults formed at fast-spreading centres. Conversely, plate stretching, with differing amounts of constant-rate magmatic dyke intrusion, can explain the great variety of fault offset seen at slow-spreading ridges. Very-large-offset normal faults only form when about half the plate separation at a ridge is accommodated by dyke intrusion.
journal_name
Naturejournal_title
Natureauthors
Buck WR,Lavier LL,Poliakov ANdoi
10.1038/nature03358keywords:
subject
Has Abstractpub_date
2005-04-07 00:00:00pages
719-23issue
7034eissn
0028-0836issn
1476-4687pii
nature03358journal_volume
434pub_type
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