the highest central andes victor a. ramos laboratorio de tectónica andina universidad de buenos...
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THE HIGHESTTHE HIGHESTCENTRAL ANDESCENTRAL ANDES
Victor A. RamosVictor A. Ramos
Laboratorio de Tectónica AndinaLaboratorio de Tectónica AndinaUniversidad de Buenos AiresUniversidad de Buenos Aires
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AconcaguaAconcagua
MercedarioMercedario
TupungatoTupungato
La RamadaLa Ramada
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Cerro Aconcagua (6.965 m)Cerro Aconcagua (6.965 m)
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Cerro Aconcagua (6.965 m)Cerro Aconcagua (6.965 m)
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Pleistocene Volcano
VOLCÁN TUPUNGATOVOLCÁN TUPUNGATO(6.850 m)(6.850 m)
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CENTRAL ANDESCENTRAL ANDES
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ZONA DE BENIOFFZONA DE BENIOFFSUBHORIZONTALSUBHORIZONTAL
Cordillera PrincipalCordillera Principal
Cordillera FrontalCordillera Frontal
PrecordilleraPrecordillera
Sierras PampeanasSierras Pampeanas
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ACONCAGUA FOLD AND THRUST BELTACONCAGUA FOLD AND THRUST BELT
Cegarra (1994)Cegarra (1994)
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Juan Fern
ández Rid
ge
Juan Fern
ández Rid
ge
Sierras PampeanasSierras Pampeanas
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BENIOFF ZONESBENIOFF ZONES
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50 km
Mendoza
CórdobaSanJuan
BROKEN FORELAND BASINSBROKEN FORELAND BASINS
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MAGNETOTELLURIC PROFIL OF SIERRAS PAMPEANASMAGNETOTELLURIC PROFIL OF SIERRAS PAMPEANAS
Booker et al. (2004)Booker et al. (2004)
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PALEOZOIC TERRANES
Ramos (1994)Ramos (1994)
RÍO DE LA PLATACRATON
PAMPIA
CUYANIA
CHILENIA
PICHIDANGUI
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TECTONIC EVOLUTION OF SIERRAS PAMPEANASTECTONIC EVOLUTION OF SIERRAS PAMPEANAS
COLLISIONCOLLISION
COLLISIONCOLLISION
COLLISIONCOLLISION
Quenardelle & Ramos (1999)Quenardelle & Ramos (1999)
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EASTERN SIERRAS PAMPEANASEASTERN SIERRAS PAMPEANAS
Rapela et al. (1998)Rapela et al. (1998)
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Ramos (1988)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 PAMPEANASEASTERN SIERRAS PAMPEANAS
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Rapela et al. (1998)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 PAMPEANASEASTERN SIERRAS PAMPEANAS
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Rapela et al. (1998)Rapela et al. (1998)
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Age of high grade metamorphism:Age of high grade metamorphism: 1.- Migmatite with garnate where M2 has been established1.- Migmatite with garnate where M2 has been established with inherited zircon ageswith inherited zircon ages
U-Pb SHRIMP DATAU-Pb SHRIMP DATA
EASTERN SIERRAS PAMPEANASEASTERN SIERRAS PAMPEANAS
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Rapela et al. (1998)Rapela et al. (1998)
Last deformation D3:Last deformation D3: 2.- Monacite ages in granitoids2.- Monacite ages in granitoids
U-Pb SHRIMP DATAU-Pb SHRIMP DATA
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EASTERN SIERRAS PAMPEANASEASTERN SIERRAS PAMPEANAS
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GRANITOS PRECOLISIONALESGRANITOS PRECOLISIONALES
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Rapela et al. (1998)Rapela et al. (1998)
PAMPEAN GRANITOIDSPAMPEAN GRANITOIDS
EASTERN SIERRAS PAMPEANASEASTERN SIERRAS PAMPEANAS
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Rapela et al. (1998)Rapela et al. (1998)
Tectonic setting of granitoidsTectonic setting of granitoids a) Small postectonic (post-D2)a) Small postectonic (post-D2) b) Metaluminous and peraluminous granitoidsb) Metaluminous and peraluminous granitoids
EASTERN SIERRAS PAMPEANASEASTERN SIERRAS PAMPEANAS
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Preorogenic granitoids (Early Cambrian)Preorogenic granitoids (Early Cambrian)
Rapela et al. Rapela et al. (1998)(1998)
Río SuquiaAscochinga
EASTERN SIERRAS PAMPEANASEASTERN SIERRAS PAMPEANAS
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Postorogenic granitoids (Early Cambrian)Postorogenic granitoids (Early Cambrian)
Rapela et al. Rapela et al. (1998)(1998)
EASTERN SIERRAS PAMPEANASEASTERN SIERRAS PAMPEANAS
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EARLY PALEOZOIC EARLY PALEOZOIC MAGMATIC ARCSMAGMATIC ARCSEAST OF CUYANIAEAST OF CUYANIA
• Late Proterozoic- Early Cambrian Late Proterozoic- Early Cambrian magmatic arc of eastern Sierras magmatic arc of eastern Sierras Pampeanas.Pampeanas.
• Late Cambrian - Ordovician magmaticLate 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 blocksaccretion of different continental blocks with development of magmatic arcs and with development of magmatic arcs and ophiolite obduction.ophiolite obduction.
Quenardelle y Ramos (1999)Quenardelle y Ramos (1999)
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Pankhurst et al. (2000)Pankhurst et al. (2000)
WESTERN SIERRAS PAMPEANASWESTERN SIERRAS PAMPEANAS
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PRE -, SYN -, AND POSTCOLLISIONAL GRANITOIDS
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AA
CC
BB
DDFF
GGHH
EE
OPHIOLITE BELTSOPHIOLITE BELTS
• A. CalalasteA. Calalaste
• B. FiambaláB. Fiambalá
• C. Valle Fértil-C. Valle Fértil- Toro NegroToro Negro
• D. CortaderasD. Cortaderas
• E. Pie de PaloE. Pie de Palo
• F. Bosque AlegreF. Bosque Alegre
• G. VirorcoG. Virorco
• H. Athos PampaH. Athos Pampa
EARLYPALEOZOIC
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BASAL TECTONITESBASAL TECTONITES
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CUMULATOS IN GABBROS CUMULATOS IN GABBROS
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Pillow-lavas in MORB tholeiitesPillow-lavas in MORB tholeiites
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BASEMENT OF CUYANIA U-Pb in zircon ages
OlenellusOlenellus
LAURENTIAN FOSSILS
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PROVENANCE OF THE CUYANIA SYNRIFT DEPOSITS
Corrected values after Finney (2004)
Ramos (2004)Ramos (2004)
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ISOTOPIC CHARACTERISTICS OF CUYANIA
Groomet et al. (2003)Groomet et al. (2003)
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COLLISION OF CUYANIA
Ramos (2004)Ramos (2004)
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STAGES IN THE CUYANIA COLLISION
Ramos (2004)Ramos (2004)
PrecordilleraPrecordilleracarbonate platformcarbonate platform
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Olistholiths Olistholiths
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PRECORDILLERA FAMATINA
SHRIMP AGES OF K-BENTONITES AND GONDWANAN VOLCANIC ROCKS
Baldo et al. (2003)Baldo et al. (2003)
LAURENTIA GONDWANA
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Many Thanks . . .Many Thanks . . .