By Suzanne Mahlburg Kay, Victor A. Ramos
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Additional info for Evolution of an Andean margin: a tectonic and magmatic view from the Andes to the Neuquén Basin (35 degrees-39 degrees S lat)
The easternmost Miocene eruptions in the Neuquén Basin occurred at the Chachahuén volcanic complex in the Sierra de Chachahuén (Fig. M. Kay et al. (Fig. 1). As described by Kay et al. (this volume, chapter 10), the Chachahuén complex consists of the ca. 9 Ma Vizcachas group orthopyroxene-bearing dacites and rhyolites and the ca. 9 Ma high-K Chachahuén group basalts, hornblende-bearing andesites, and dacites. All of these magmas erupted from a nested caldera complex located at the intersection of a NW-SE–trending and a NE-SW–trending fault system.
Kay et al. Figure 6 (continued). Figure 7. Th/Hf versus Ta/Hf ratios for Neuquén Basin region magmatic samples. Th/Hf ratios are a relative measure of source components from a subducting oceanic slab, and Ta/Hf ratios are a relative measure of mantle enrichment. Ta and Hf are both high field strength elements; Ta is sensitive to oxidation as it replaces Ti, whereas Hf does not. General ranges of values commonly observed in intraplate, backarc, and arc settings are indicated. Data sources are as in Figure 5.
5 Ma for a granitoid cutting the pyroclastic sequence. The top of the Cura Mallín Formation is generally designated at a change from predominantly sedimentary rocks to volcanic tuffs, agglomerates, and lava flows of Miocene age. The volcanic rocks and related dikes, sills, and granitoid intrusives in Chile are mapped in the Trapa Trapa Formation (Niemeyer and Muñoz, 1983). 4 Ma to ca. 12 Ma (Niemeyer and Muñoz, 1983; Muñoz and Niemeyer, 1984; Suárez and Emparan, 1995). , this volume, chapter 8; Figs.