Evolution of an Andean Margin: A Tectonic and Magmatic View by Suzanne Mahlburg Kay, Victor A. Ramos

By Suzanne Mahlburg Kay, Victor A. Ramos

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Extra info for Evolution of an Andean Margin: A Tectonic and Magmatic View from the Andes to the Neuquen Basin (35 Degress-39 Degrees S Lat) (Special Paper (Geological Society of America))

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5 and 38°S is region considered in this paper. SVZ—Southern Volcanic Zone. Upper Cretaceous to Holocene magmatism 21 Figure 2 (on this and following page). Maps of (A) pre-Pliocene and (B) post-Miocene magmatic units in Argentina erupted over the Neuquén Basin region. Maps are modified from the provincial maps of Neuquén (Delpino and Deza, 1995) and Mendoza (Servicio Geológico Minero Argentino, Buenos Aires). Cortaderas lineament is after Ramos (1978). Circles in early Miocene units in backarc schematically indicate late early Miocene volcanic centers.

6 7 7 22 TABLE 4. WHOLE-ROCK CHEMISTRY: MIOCENE CURA MALLIN AND TRAPA TRAPA FORMATIONS 4 5 6 7 8 9 10 11 12 Cura Mallin Fm. Trapa Trapa Fm. ca. 965 1456 ca. 019 1545 ca. 7 7 3 11 13 14 15 Trapa Trapa Fm. 114 1642 ca. M. Kay et al. 816° 1567 1561 1442 1335 7 10? 4 1250 1673 10? 4 17 10 9 TABLE 5. WHOLE ROCK CHEMISTRY OF NEOGENE MAGMATIC ROCKS FROM THE NEUQUEN ANDES WEST OF THE CORDILLERA DEL VIENTO 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Q. Honda Miocene Cajón Negro Fm. Fm. 4 134 47 40 TABLE 6. M.

The active rifting of this stage generally terminated as Middle Jurassic Andean tectonism and magmatism began to the west. During the second stage, the discrete rifts and intervening basement blocks of the first stage generally merged into a broad postrift basin that was filled by Middle Jurassic to Paleogene sedimentary strata. In the last stage, the Neuquén Basin strata were modified by Tertiary to Holocene extensional and contractional deformation and affected by periodic magmatic events across the basin.

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