| dbo:abstract |
سحب البلاطة أو السحب الشريحي (بالإنجليزية: Slab pull)، هي جزء من حركة الصفيحة التكتونية التي يمكن حسابها عن طريق الاندساس. تقوم عن طريق عمل تيارات الحمل الحراري التنازلي في الوشاح (الجزء شبه السائل من الغلاف الأرضي) على سحب الصفيحة إلى الأسفل وتكوين خنادق المحيطات. وتساهم حركات التلال في الصدوع فقط من 5 إلى 10٪. العلماء استطاعوا تحديد قوة سحب البلاطة عن طريق المعادلة التالية : حيث أن : K هي 4.2g (تسارع الجاذبية = 9.81 م / ثانية 2 ).Δρ يساوي 80 كغ/م3 وهو متوسط فرق الكثافة بين البلاطة والغلاف الموري المحيط بها؛ L هو طول اللوح المحسوب فقط للجزء فوق 670 كم (الحد العلوي / السفلي من الوشاح) ؛ A هو عمر البلاطة بالسنوات في القاع. (ar) Slab pull is a geophysical mechanism whereby the cooling and subsequent densifying of a subducting tectonic plate produces a downward force along the rest of the plate. In 1975 Forsyth and Uyeda used the inverse theory method to show that, of the many forces likely to be driving plate motion, slab pull was the strongest. Plate motion is partly driven by the weight of cold, dense plates sinking into the mantle at oceanic trenches. This force and slab suction account for almost all of the force driving plate tectonics. The ridge push at rifts contributes only 5 to 10%. Carlson et al. (1983) in Lallemandet al. (2005) defined the slab pull force as: Where: K is 4.2g (gravitational acceleration = 9.81 m/s2) according to McNutt (1984);Δρ = 80 kg/m3 is the mean density difference between the slab and the surrounding asthenosphere;L is the slab length calculated only for the part above 670 km (the upper/lower mantle boundary);A is the slab age in Ma at the trench. The slab pull force manifests itself between two extreme forms: * The aseismic back-arc extension as in the Izu–Bonin–Mariana Arc. * And as the Aleutian and Chile tectonics with strong earthquakes and back-arc thrusting. Between these two examples there is the evolution of the Farallon Plate: from the huge slab width with the Nevada, the Sevier and Laramide orogenies; the Mid-Tertiary ignimbrite flare-up and later left as Juan de Fuca and Cocos plates, the Basin and Range Province under extension, with slab break off, smaller slab width, more edges and mantle return flow. Some early models of plate tectonics envisioned the plates riding on top of convection cells like conveyor belts. However, most scientists working today believe that the asthenosphere does not directly cause motion by the friction of such basal forces. The North American Plate is nowhere being subducted, yet it is in motion. Likewise the African, Eurasian and Antarctic Plates. Ridge push is thought responsible for the motion of these plates. The subducting slabs around the Pacific Ring of Fire cool down the Earth and its core-mantle boundary. Around the African Plate upwelling mantle plumes from the core-mantle boundary produce rifting including the African and Ethiopian rift valleys. (en) |
| dbo:wikiPageExternalLink |
https://web.archive.org/web/20110613195606/http:/www.soest.hawaii.edu/GG/FACULTY/conrad/papers/Conrad_EPSL2004.pdf https://www.sciencedaily.com/releases/2010/07/100716125841.htm http://www.soest.hawaii.edu/GG/FACULTY/conrad/papers/Conrad_EPSL2004.pdf |
| dbo:wikiPageID |
25025301 (xsd:integer) |
| dbo:wikiPageLength |
6968 (xsd:nonNegativeInteger) |
| dbo:wikiPageRevisionID |
1115374387 (xsd:integer) |
| dbo:wikiPageWikiLink |
dbr:List_of_earthquakes_in_Chile dbc:Geodynamics dbr:Inverse_problem dbr:Izu–Bonin–Mariana_Arc dbr:Geophysics dbr:Conveyor_belt dbr:Annum dbr:Antarctic_Plate dbr:Basin_and_Range_Province dbr:Friction dbr:Plate_tectonics dbr:Seafloor_spreading dbr:Mid-Tertiary_ignimbrite_flare-up dbc:Geophysics dbc:Geology_theories dbr:Core-mantle_boundary dbr:Laramide_orogeny dbr:African_Plate dbr:Eurasian_Plate dbr:North_American_Plate dbr:Farallon_Plate dbr:Juan_de_Fuca_Plate dbr:Extension_(geology) dbr:Back-arc_basin dbr:Subduction dbr:Asthenosphere dbc:Plate_tectonics dbc:Subduction dbr:Aleutian_Arc dbr:Cocos_Plate dbr:Thrust_fault dbr:Oceanic_trench dbr:Mantle_(geology) dbr:Mid-ocean_ridge dbr:Sevier_orogeny dbr:Slab_(geology) dbr:Slab_detachment dbr:Ridge_push dbr:African_Rift_Valley dbr:Rifting_(geology) dbr:Pacific_Ring_of_Fire dbr:Slab_suction_force dbr:Nevada_orogeny dbr:Ethiopian_Rift_Valley |
| dbp:wikiPageUsesTemplate |
dbt:Cite_journal dbt:Cite_web dbt:Math dbt:Reflist dbt:Short_description dbt:Physical_oceanography |
| dct:subject |
dbc:Geodynamics dbc:Geophysics dbc:Geology_theories dbc:Plate_tectonics dbc:Subduction |
| rdf:type |
yago:Abstraction100002137 yago:Cognition100023271 yago:Explanation105793000 yago:HigherCognitiveProcess105770664 yago:Process105701363 yago:PsychologicalFeature100023100 yago:WikicatGeologyTheories yago:Theory105989479 yago:Thinking105770926 |
| rdfs:comment |
سحب البلاطة أو السحب الشريحي (بالإنجليزية: Slab pull)، هي جزء من حركة الصفيحة التكتونية التي يمكن حسابها عن طريق الاندساس. تقوم عن طريق عمل تيارات الحمل الحراري التنازلي في الوشاح (الجزء شبه السائل من الغلاف الأرضي) على سحب الصفيحة إلى الأسفل وتكوين خنادق المحيطات. وتساهم حركات التلال في الصدوع فقط من 5 إلى 10٪. العلماء استطاعوا تحديد قوة سحب البلاطة عن طريق المعادلة التالية : حيث أن : (ar) Slab pull is a geophysical mechanism whereby the cooling and subsequent densifying of a subducting tectonic plate produces a downward force along the rest of the plate. In 1975 Forsyth and Uyeda used the inverse theory method to show that, of the many forces likely to be driving plate motion, slab pull was the strongest. Plate motion is partly driven by the weight of cold, dense plates sinking into the mantle at oceanic trenches. This force and slab suction account for almost all of the force driving plate tectonics. The ridge push at rifts contributes only 5 to 10%. Where: (en) |
| rdfs:label |
سحب البلاطة (ar) Slab pull (en) |
| owl:sameAs |
freebase:Slab pull yago-res:Slab pull wikidata:Slab pull dbpedia-ar:Slab pull https://global.dbpedia.org/id/4ueHg |
| prov:wasDerivedFrom |
wikipedia-en:Slab_pull?oldid=1115374387&ns=0 |
| foaf:isPrimaryTopicOf |
wikipedia-en:Slab_pull |
| is dbo:wikiPageRedirects of |
dbr:Slab_Pull dbr:Slab_pull_force |
| is dbo:wikiPageWikiLink of |
dbr:Archean_subduction dbr:Timeline_of_the_development_of_tectonophysics_(after_1952) dbr:Continental_drift dbr:Geological_history_of_Borneo dbr:Geology_of_Himachal_Pradesh dbr:Geology_of_New_Caledonia dbr:Geology_of_the_Alps dbr:Opening_of_the_North_Atlantic_Ocean dbr:Apennine_Mountains dbr:Plate_tectonics dbr:Seafloor_spreading dbr:Afar_Triple_Junction dbr:Eclogitization dbr:Slab_Pull dbr:Mid-ocean_ridge dbr:Slab_(geology) dbr:Slab_pull_force dbr:Slab_suction dbr:Triple_junction dbr:Outline_of_oceanography dbr:Slab_detachment dbr:Ridge_push |
| is foaf:primaryTopic of |
wikipedia-en:Slab_pull |