From Continental Subduction to Uppercrustal Nappes Stacking A Numerical Analysis
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1 From Continental Subduction to Uppercrustal Nappes A Numerical Analysis CARRY Nicolas, Frédéric GUEYDAN, Jean Pierre BRUN, Denis GAPAIS Géosciences Rennes, UMR 6118, Université de Rennes 1 Didier MARQUER Géosciences,, EA2642, Université de Franche Comté
2 Introduction Continental subduction : between oceanic closure and mountain belt surrection Continental margin : first continental part subducted in moho Lithosphere This study : understand the mechanisms responsible for a detachment of a crustal piece Methods : simple thermal model and force balance analysis
3 St re ng t Overlying h?? Force balance analysis Ts: Tectonic stress Bs: Buoyancy stress µo: Overlying weigth stress Sum: : decrease in overlying lithosphere increase in overlying asthenosphere BURIAL STACKING OCCURS IF MATERIAL STRENGTH < ACTING STRESS
4 2D thermal and strength evolution in a subducted continental margin 2D finite elements Conductive Transitory No crustal heterogenity 100 km Numerical code SARPP after Y. Leroy & F. Gueydan km
5 Thermal and strength evolution 2 My (36,4 km) Temperature Brittle law Strength Ductile law Temperature 4 My (77,34 km) Strength Temperature 6 My (100,9 km) Strength Strength (MPa)
6 Crustal strength evolution BRITTLE 2 My
7 Crustal strength evolution BRITTLE 3 My
8 Crustal strength evolution DUCTILE BRITTLE 4 My
9 Crustal strength evolution DUCTILE 6 My
10 vs 2 My BRITTLE DUCTILE 4 My 6 My BURIAL Difference between and
11 evolution 2 My (36,4km) 4 My (77,34 km) Burial depth 45 km 6 My (100,9 km) Difference: Stress Strength = Large difference Weak material Easy stack Detached unit Able stacking area
12 Parametric study: crustal units thickness th g n e L Thickness Dip angle and velocity cm.y cm.y ,5 cm.y 1 5 2,5 cm.y 1 BURIAL Depth (km) 0 kb 15kb 30kb 45kb Pressure
13 Parametric study: crustal units length th g n e L Dip angle and velocity cm.y cm.y ,5 cm.y 1 5 2,5 cm.y 1 BURIAL Depth (km) 0 kb 15kb 30kb 45kb Pressure
14 Validation : The Lepontine case N Tectonics maps of Central Alps Gothard Si Ta Ad Lepontine crustal units Thin and long units Only upper crustal rocks Su Legende Lv: Leventina Ta: Tambo Si: Simano Su: Suretta Ad: Adula Lv 25 km Aar Ad Su Ta Si Cross section of the Central Alps (modified after Schmidt 2004) Lv
15 Validation : The Lepontine case N Tectonics maps of Central Alps Example : Simano crustal unit Simano Pic pressure (D1): 12kbar (R. Rütti, 2003) Length: around 35 km Thickness: around 2,5 km 25 km Cross section of the Central Alps (modified after Schmidt 2004) Simano
16 Validation : The Lepontine case Dip angle and velocity cm.y cm.y ,5 cm.y 1 5 2,5 cm.y 1 Ad Lv Si Ta Su Slab angle : Around 20 In agreement with PT angle estimations (for example, Dale & al., 2003) Lv Ad Si Su Ta Lv: Leventina Si: Simano Ad: Adula Ta: Tambo Su: Suretta Burial depth (km)
17 Conclusions The stacking of upper crustal units in the subduction zone : (1) is a direct consequence of heating from above (2) does not require crust heterogeneity (3) involves thin & long units The modelling results are consistent with the Lepontine nappes example Perspective: estimating the velocity and dip of subduction slabs from P T datas
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