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Short description - changed from "Structure and processes associated with zones of lateral displacement in the Earth's crust" to "Deformation dominated by horizontal movement in Earth's lithosphere" |
LucasKannou (talk | contribs) m Spelling/grammar/punctuation/typographical correction (highy → highly) |
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{{short description|Deformation dominated by horizontal movement in Earth's lithosphere}}
'''Strike-slip tectonics''' or '''wrench tectonics''' is a type of [[tectonics]] that is dominated by lateral (horizontal) movements within the [[Crust (geology)|Earth's crust]] (and [[lithosphere]]). Where a zone of strike-slip tectonics forms the boundary between two [[Plate tectonics|tectonic plates]], this is known as a [[transform fault|transform]] or conservative plate boundary. Areas of strike-slip tectonics are characterised by particular deformation styles including: ''stepovers'', ''Riedel shears'', ''flower structures'' and ''strike-slip duplexes''. Where the displacement along a zone of strike-slip deviates from parallelism with the zone itself, the style becomes either [[transpression
==Deformation styles==
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===Stepovers===
When strike-slip fault zones develop, they typically form as several separate fault segments that are offset from each other. The areas between the ends of adjacent segments are known as ''stepovers''. In the case of a dextral fault zone, a right-stepping offset is known as an extensional stepover as movement on the two segments leads to extensional deformation in the zone of offset, while a left-stepping offset is known as a compressional stepover. For active strike-slip systems, earthquake ruptures may jump from one segment to another across the intervening stepover, if the offset is not too great. Numerical modelling has suggested that jumps of at least 8
===Riedel shear structures===
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===Flower structures===
In detail, many strike-slip faults at surface consist of [[en echelon]]
[[File:Deformed bedded chert with flower structures, Busuanga, Palawan (annotated).png|thumb|left|An exposure of highly deformed bedded chert in Busuanga, Philippines, containing a flower structure (yellow dashed lines)]]
===Strike-slip duplexes===
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| volume = 3
| year = 2009
| publisher = John Wiley & Sons
| url=https://books.google.com/books?id=JBF8UGc_M-sC&pg=PT358
| isbn = 978-1-118-68808-3
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===Zones of oblique collision===
In most zones of [[continental collision|continent-continent collision]], the relative movement of the plates is oblique to the plate boundary itself. The deformation along the boundary is normally partitioned into dip-slip contractional structures in the foreland with a single large strike-slip structure in the [[hinterland (geology)|hinterland]] accommodating all the strike-slip component along the boundary. Examples include the ''Main Recent Fault'' along the boundary between the [[Arabian plate
===The deforming foreland of a zone of continent-continent collision===
The process sometimes known as [[indenter tectonics]], first elucidated by [[Paul Tapponnier]], occurs during a collisional event where one of the plates deforms internally along a system of strike-slip faults. The best known active example is the system of strike-slip structures observed in the [[Eurasian
==References==
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