Evolution of an Andean margin: a tectonic and magmatic view by Suzanne Mahlburg Kay, Victor A. Ramos

By Suzanne Mahlburg Kay, Victor A. Ramos

Show description

Read Online or Download Evolution of an Andean margin: a tectonic and magmatic view from the Andes to the Neuquén Basin (35 degrees-39 degrees S lat) PDF

Similar evolution books

The Great Acceleration: How the World is Getting Faster, Faster

During this revelatory examine of contemporary residing, Robert Colvile inspects a few of the ways that the velocity of existence in our society is expanding and examines the evolutionary technological know-how at the back of our swiftly accelerating want for switch, in addition to why it's not going we'll be capable of decelerate . . . or maybe are looking to.

Evolution der Viererkette: Das Ballgewinnspiel

Mit der Viererkette wurde im Fußball eine neue Ära eingeleitet. In Synthese mit einem kompakten Mannschaftsverband wird Überzahl am Ball geschaffen und alle relevanten Pässe zum eigenen Tor zugestellt. Die logische Fortsetzung dieser Meilensteine der Fußballtaktik ist das Ballgewinnspiel. Durch geschickt organisierte Laufwege der Offensivspieler wird der Gegner in "Fallen" gelockt und ein Ballgewinn in seiner Tornähe erzwungen.

Large meteorite impacts and planetary evolution V

Influence cratering is among the such a lot primary geological approaches. On many planets, effect craters are the dominant geological landform. in the world, erosion, plate tectonics, and volcanic resurfacing consistently ruin the impression cratering list, yet even right here, the geological, organic, and environmental results of influence cratering are obvious.

The Cradle of Humanity: How the Changing Landscape of Africa Made Us So Smart

One of many basic questions of our life is why we're so clever. there are numerous drawbacks to having a wide mind, together with the massive nutrients consumption had to hold the organ operating, the frequency with which it is going flawed, and our very excessive boy or girl and mom mortality charges in comparison with different mammals, end result of the trouble of giving start to offspring with very huge heads.

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)

Example text

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.

Download PDF sample

Rated 4.25 of 5 – based on 3 votes