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Abstract:

Extensive Neogene Patagonian plateau lavas (46.5° to 49.5°S) southeast of the modern Chile Triple Junction can be related to opening of asthenospheric "slab windowsŁ associated with collisions of Chile Rise segments with the Chile Trench at =12 Ma and 6 Ma. Support comes from 26 new total-fusion, whole rock 40Ar/39Ar ages and geochemical data from back arc plateau lavas. In most localities, plateau lava sequences consist of voluminous, tholeiitic main-plateau flows overlain by less voluminous, 2 to 5 million year younger, alkalic postplateau flows. Northeast of where the ridge collided at ≈12 Ma, most lavas are syncollisional or postcollisional in age, with eruptions of both sequences migrating northeastward at 50 to 70 km/Ma. Plateau lavas have ages from 12 to 7 Ma in the western back arc and from 5 to 2 Ma farther to the northeast. Trace element and isotopic data indicate main-plateau lavas formed as larger percentage melts of a garnet-bearing, oceanic island basalt (OIB) -like mantle than postplateau lavas. The highest percentage melts erupted in the western and central plateaus. In a migrating slab window model, main-plateau lavas can be explained as melts that formed as upwelling, subslab asthenosphere which flowed around the trailing edge of the descending Nazca Plate and then interacted with subductionaltered asthenospheric wedge and continental lithosphere. Alkaline, postplateau lavas can be explained as melts generated by weaker upwelling of subslab asthenosphere through the open slab window. Thermal problems of highpressure melt generation of anhydrous mantle can be explained by volatiles (H2O and CO2) introduced by the subduction process into slab window source region(s). An OIB-like, rather than a mid-ocean ridge basalt (MORB) -like source region, and the lack of magmatism northeast of where ridge collision occurred at ≈13 to 14 Ma can be explained by entrainment of "weak" plume(s) or regional variations in an ambient, OIB-like asthenosphere.

Registro:

Documento: Artículo
Título:Neogene Patagonian plateau lavas: Continental magmas associated with ridge collision at the Chile Triple Junction
Autor:Gorring, M.L.; Kay, S.M.; Zeitler, P.K.; Ramos, V.A.; Rubiolo, D.; Fernandez, M.I.; Panza, J.L.
Filiación:Inst. for the Study of Continents, Department of Geological Sciences, Cornell University, Ithaca, NY, United States
Dept. of Earth and Environ. Sciences, Lehigh University, Bethlehem, PA, United States
Depto. Ciencias Geológicas, Universidad de Buenos Aires, Buenos Aires, Argentina
Serv. Geológico de Argentina, Buenos Aires, Argentina
Inst. for the Study of Continents, Department of Geological Sciences, Cornell University, Ithaca, NY 14853, United States
Serv. Geológico de Argentina, Avenida Julio A. Roca 651, 1322 Buenos Aires, Argentina
Depto. Ciencias Geológicas, Ciudad Universitaria, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina
Dept. of Earth and Environ. Sciences, Lehigh University, Bethlehem, PA 18015, United States
Palabras clave:Basalt; Carbon dioxide; Lithology; Tectonics; Trace elements; Transport properties; Anhydrous mantle; Chile triple junctions; Continental lithosphere; Geochemical data; Mid ocean ridge basalts; Oceanic island basalts; Regional variation; Subduction process; Structural geology; igneous geochemistry; magmatism; Neogene; OIB; plateau lava; ridge collision; South America, Patagonia
Año:1997
Volumen:16
Número:1
Página de inicio:1
Página de fin:17
DOI: http://dx.doi.org/10.1029/96TC03368
Título revista:Tectonics
Título revista abreviado:Tectonics
ISSN:02787407
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_02787407_v16_n1_p1_Gorring

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Citas:

---------- APA ----------
Gorring, M.L., Kay, S.M., Zeitler, P.K., Ramos, V.A., Rubiolo, D., Fernandez, M.I. & Panza, J.L. (1997) . Neogene Patagonian plateau lavas: Continental magmas associated with ridge collision at the Chile Triple Junction. Tectonics, 16(1), 1-17.
http://dx.doi.org/10.1029/96TC03368
---------- CHICAGO ----------
Gorring, M.L., Kay, S.M., Zeitler, P.K., Ramos, V.A., Rubiolo, D., Fernandez, M.I., et al. "Neogene Patagonian plateau lavas: Continental magmas associated with ridge collision at the Chile Triple Junction" . Tectonics 16, no. 1 (1997) : 1-17.
http://dx.doi.org/10.1029/96TC03368
---------- MLA ----------
Gorring, M.L., Kay, S.M., Zeitler, P.K., Ramos, V.A., Rubiolo, D., Fernandez, M.I., et al. "Neogene Patagonian plateau lavas: Continental magmas associated with ridge collision at the Chile Triple Junction" . Tectonics, vol. 16, no. 1, 1997, pp. 1-17.
http://dx.doi.org/10.1029/96TC03368
---------- VANCOUVER ----------
Gorring, M.L., Kay, S.M., Zeitler, P.K., Ramos, V.A., Rubiolo, D., Fernandez, M.I., et al. Neogene Patagonian plateau lavas: Continental magmas associated with ridge collision at the Chile Triple Junction. Tectonics. 1997;16(1):1-17.
http://dx.doi.org/10.1029/96TC03368