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

Aconcagua Mercedario Tupungato La Ramada

Cerro Aconcagua (6.965 m)

Pleistocene Volcano VOLCÁN TUPUNGATO (6.850 m)

CENTRAL ANDES

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

ACONCAGUA FOLD AND THRUST BELT Cegarra (1994)

Juan Fernández Ridge Sierras Pampeanas

BENIOFF ZONES

50 km Mendoza Córdoba San Juan BROKEN FORELAND BASINS

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

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

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

EASTERN SIERRAS PAMPEANAS Rapela et al. (1998)

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

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

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

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

GRANITOS PRECOLISIONALES

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

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

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

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

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)

Pankhurst et al. (2000) WESTERN SIERRAS PAMPEANAS

PRE -, SYN -, AND POSTCOLLISIONAL GRANITOIDS

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

BASAL TECTONITES

CUMULATOS IN GABBROS

Pillow-lavas in MORB tholeiites

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

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

ISOTOPIC CHARACTERISTICS OF CUYANIA Groomet et al. (2003)

COLLISION OF CUYANIA Ramos (2004)

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

Olistholiths

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

Many Thanks...