1. THE HIGHEST CENTRAL ANDES Victor A. Ramos Laboratorio de Tectónica Andina Universidad de Buenos Aires

2. Aconcagua Mercedario Tupungato La Ramada

3. Cerro Aconcagua (6.965 m)

5. Pleistocene Volcano VOLCÁN TUPUNGATO (6.850 m)

7. CENTRAL ANDES

8. ZONA DE BENIOFF SUBHORIZONTAL Cordillera Principal Cordillera Principal Cordillera Frontal Cordillera Frontal Precordillera Precordillera Sierras Pampeanas Sierras Pampeanas

9. ACONCAGUA FOLD AND THRUST BELT Cegarra (1994)

12. Juan Fernández Ridge Sierras Pampeanas

13. BENIOFF ZONES

14. 50 km Mendoza Córdoba San Juan BROKEN FORELAND BASINS

16. MAGNETOTELLURIC PROFIL OF SIERRAS PAMPEANAS Booker et al. (2004)

17. PALEOZOIC TERRANES Ramos (1994) RÍO DE LA PLATA CRATON PAMPIA CUYANIA CHILENIA PICHIDANGUI

18. TECTONIC EVOLUTION OF SIERRAS PAMPEANAS COLLISION COLLISION COLLISION Quenardelle & Ramos (1999)

19. EASTERN SIERRAS PAMPEANAS Rapela et al. (1998)

20. Ramos (1988) Based on: Based on: Gordillo (1984)Gordillo (1984) Patiño Douce (1987)Patiño Douce (1987) Jordan et al. (1988)Jordan et al. (1988) EASTERN SIERRAS PAMPEANAS

21. Rapela et al. (1998) METAMORPHISM: M3: Low-P (2,5 to 4,0 Kb) Isothermal decompression M2: High-T / Medium-P Regional metamorphism M1: Medium grade Older foliation in garnets EASTERN SIERRAS PAMPEANAS

22. Rapela et al. (1998) 1 Age of high grade metamorphism: 1.- Migmatite with garnate where M2 has been established 1.- Migmatite with garnate where M2 has been established with inherited zircon ages with inherited zircon ages U-Pb SHRIMP DATA EASTERN SIERRAS PAMPEANAS

23. Rapela et al. (1998) Last deformation D3: 2.- Monacite ages in granitoids 2.- Monacite ages in granitoids U-Pb SHRIMP DATA 2 EASTERN SIERRAS PAMPEANAS

24. GRANITOS PRECOLISIONALES

25. Rapela et al. (1998) PAMPEAN GRANITOIDS EASTERN SIERRAS PAMPEANAS

26. Rapela et al. (1998) Tectonic setting of granitoids a) Small postectonic (post-D2) a) Small postectonic (post-D2) b) Metaluminous and peraluminous granitoids b) Metaluminous and peraluminous granitoids EASTERN SIERRAS PAMPEANAS

27. Preorogenic granitoids (Early Cambrian) Rapela et al. (1998) Río Suquia Ascochinga EASTERN SIERRAS PAMPEANAS

28. Postorogenic granitoids (Early Cambrian) Rapela et al. (1998) EASTERN SIERRAS PAMPEANAS

29. EARLY PALEOZOIC MAGMATIC ARCS EAST OF CUYANIA Late Proterozoic- Early Cambrian Late Proterozoic- Early Cambrian magmatic arc of eastern Sierras Pampeanas. Late Cambrian - Ordovician magmatic Late Cambrian - Ordovician magmatic arc of western Sierras Pampeanas. arc of western Sierras Pampeanas. Ordovician magmatic arc of the Ordovician magmatic arc of the Famatina terrane. Famatina terrane. The early Paleozoic is a period of The early Paleozoic is a period of accretion of different continental blocks accretion of different continental blocks with development of magmatic arcs and with development of magmatic arcs and ophiolite obduction. ophiolite obduction. Quenardelle y Ramos (1999)

30. Pankhurst et al. (2000) WESTERN SIERRAS PAMPEANAS

31. PRE -, SYN -, AND POSTCOLLISIONAL GRANITOIDS

32. A C B D F G H E OPHIOLITE BELTS A. Calalaste A. Calalaste B. Fiambalá B. Fiambalá C. Valle Fértil- C. Valle Fértil- Toro Negro Toro Negro D. Cortaderas D. Cortaderas E. Pie de Palo E. Pie de Palo F. Bosque Alegre F. Bosque Alegre G. Virorco G. Virorco H. Athos Pampa H. Athos Pampa EARLY PALEOZOIC

33. BASAL TECTONITES

34. CUMULATOS IN GABBROS

35. Pillow-lavas in MORB tholeiites

36. BASEMENT OF CUYANIA U-Pb in zircon ages Olenellus Olenellus LAURENTIAN FOSSILS

37. PROVENANCE OF THE CUYANIA SYNRIFT DEPOSITS Corrected values after Finney (2004) Ramos (2004)

38. ISOTOPIC CHARACTERISTICS OF CUYANIA Groomet et al. (2003)

39. COLLISION OF CUYANIA Ramos (2004)

40. STAGES IN THE CUYANIA COLLISION Ramos (2004) Precordillera carbonate platform

41. Olistholiths

42. PRECORDILLERAFAMATINA SHRIMP AGES OF K-BENTONITES AND GONDWANAN VOLCANIC ROCKS Baldo et al. (2003) LAURENTIAGONDWANA

43. Many Thanks...