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- Slab_gap_hypothesis abstract "In geology, the slab gap hypothesis is one of the explanations put forward to explain several instances of crustal extension that occur inland near former subduction zones.Standard plate tectonic theory holds that once a trench is closed by an overriding plate reaching a rift/spreading center, the plate that has just been fully consumed continues to descend beneath the overriding plate for some time, transmitting compressive pressures to the overriding plate above as well as occasional volcanism. Meanwhile, the descending plate leaves behind it a "window" of inactivity. In this view, there is no mantle upwelling, so once the crustal rift is overridden, the only residual effects are from the remnant descending plate slab. However, actual observations of the crust in western North America where the Farallon Plate's trench and rift was snuffed out millions of years ago by the westward movement of the North American Plate, and replaced by the San Andreas Fault, show not compression inland, but extension. This is most evident in the Great Basin where the continental crust and lithosphere as a whole is becoming increasingly thin. The crust here is also warming from below.The slab gap hypothesis proposes that instead of a "window", the descending slab leaves behind a "gap" through which the asthenospheric mantle of the former spreading zone continues to act beneath the overriding plate. This hypothesis then assumes that a crustal spreading zone is also underpinned by a corresponding asthenospheric mantle spreading zone or upwelling of warmer material. The gap is created because instead of the old subducted plate continuing to sink, it quickly melts, allowing the asthenospheric upwelling zone to act directly on the underside of the overriding plate, heating it and causing it to spread apart. The fast melt is because the portion of the subducted plate nearest the spreading zone is thin and still warm from its recent creation. The slab gap hypothesis goes on to state that the upwelling can form very deep cracks, which in turn lets very fluid basalt lava quickly spread over the land surface forming shield volcanoes and vast volcanic plains called "flood basalts". If, however, the extension is spread over a very large area then these flood basalt events may not occur. This idea has been used to explain the extension and very large flood basalts that occurred in what is now southern Washington, Oregon and northern California about 17 million years ago (see Columbia River Plateau). Slab gap has also been used to help explain the earlier creation of the Basin and Range Province.".
- Slab_gap_hypothesis wikiPageExternalLink SlabGap.html.
- Slab_gap_hypothesis wikiPageID "250963".
- Slab_gap_hypothesis wikiPageLength "3166".
- Slab_gap_hypothesis wikiPageOutDegree "29".
- Slab_gap_hypothesis wikiPageRevisionID "667555834".
- Slab_gap_hypothesis wikiPageWikiLink Asthenosphere.
- Slab_gap_hypothesis wikiPageWikiLink Basalt.
- Slab_gap_hypothesis wikiPageWikiLink Basin_and_Range_Province.
- Slab_gap_hypothesis wikiPageWikiLink California.
- Slab_gap_hypothesis wikiPageWikiLink Category:Plate_tectonics.
- Slab_gap_hypothesis wikiPageWikiLink Columbia_Plateau.
- Slab_gap_hypothesis wikiPageWikiLink Columbia_River_Plateau.
- Slab_gap_hypothesis wikiPageWikiLink Continental_crust.
- Slab_gap_hypothesis wikiPageWikiLink Crust_(geology).
- Slab_gap_hypothesis wikiPageWikiLink Farallon_Plate.
- Slab_gap_hypothesis wikiPageWikiLink Flood_basalt.
- Slab_gap_hypothesis wikiPageWikiLink Geology.
- Slab_gap_hypothesis wikiPageWikiLink Great_Basin.
- Slab_gap_hypothesis wikiPageWikiLink Lava.
- Slab_gap_hypothesis wikiPageWikiLink Lithosphere.
- Slab_gap_hypothesis wikiPageWikiLink Mantle_(geology).
- Slab_gap_hypothesis wikiPageWikiLink Mid-ocean_ridge.
- Slab_gap_hypothesis wikiPageWikiLink North_American_Plate.
- Slab_gap_hypothesis wikiPageWikiLink Oceanic_trench.
- Slab_gap_hypothesis wikiPageWikiLink Oregon.
- Slab_gap_hypothesis wikiPageWikiLink Plate_tectonic.
- Slab_gap_hypothesis wikiPageWikiLink Plate_tectonics.
- Slab_gap_hypothesis wikiPageWikiLink Rift.
- Slab_gap_hypothesis wikiPageWikiLink San_Andreas_Fault.
- Slab_gap_hypothesis wikiPageWikiLink Shield_volcano.
- Slab_gap_hypothesis wikiPageWikiLink Slab_(geology).
- Slab_gap_hypothesis wikiPageWikiLink Slab_window.
- Slab_gap_hypothesis wikiPageWikiLink Subduction.
- Slab_gap_hypothesis wikiPageWikiLink Subduction_zone.
- Slab_gap_hypothesis wikiPageWikiLink Tectonic_plate.
- Slab_gap_hypothesis wikiPageWikiLink Volcanism.
- Slab_gap_hypothesis wikiPageWikiLink Washington_(U.S._state).
- Slab_gap_hypothesis wikiPageWikiLink Washington_(state).
- Slab_gap_hypothesis wikiPageWikiLinkText "Slab gap hypothesis".
- Slab_gap_hypothesis wikiPageWikiLinkText "no-slab window".
- Slab_gap_hypothesis wikiPageWikiLinkText "slab gap hypothesis".
- Slab_gap_hypothesis hasPhotoCollection Slab_gap_hypothesis.
- Slab_gap_hypothesis wikiPageUsesTemplate Template:Unreferenced.
- Slab_gap_hypothesis subject Category:Plate_tectonics.
- Slab_gap_hypothesis type Article.
- Slab_gap_hypothesis type Article.
- Slab_gap_hypothesis comment "In geology, the slab gap hypothesis is one of the explanations put forward to explain several instances of crustal extension that occur inland near former subduction zones.Standard plate tectonic theory holds that once a trench is closed by an overriding plate reaching a rift/spreading center, the plate that has just been fully consumed continues to descend beneath the overriding plate for some time, transmitting compressive pressures to the overriding plate above as well as occasional volcanism. ".
- Slab_gap_hypothesis label "Slab gap hypothesis".
- Slab_gap_hypothesis sameAs m.01l7fs.
- Slab_gap_hypothesis sameAs Q7538358.
- Slab_gap_hypothesis sameAs Q7538358.
- Slab_gap_hypothesis wasDerivedFrom Slab_gap_hypothesis?oldid=667555834.
- Slab_gap_hypothesis isPrimaryTopicOf Slab_gap_hypothesis.