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The Andes pp 327–336Cite as

Upper-Crustal Structure of the Central Andes Inferred from Dip Curvature Analysis of Isostatic Residual Gravity

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Part of the book series: Frontiers in Earth Sciences ((FRONTIERS))

Abstract

The relationship between Bouguer gravity, isostatic residual gravity and its dip curvature, first-order structural elements and distribution of Neogene volcanic rocks was examined in the southern Altiplano and Puna Plateau. In the southern Altiplano, strong positive Bouguer gravity corresponds to areas affected by late Cenozoic faulting and large-scale folding of upper crustal rocks. Dip curvature analysis of isostatic residual gravity shows that elongate zones of maximum curvature correspond remarkably well with the structural grain defined by first-order folds and faults. Similarly, isostatic residual gravity in the Puna is largely controlled by prominent, upper-crustal structures and also by the distribution of Miocene and younger volcanic rocks. In particular, the Central Andean Gravity High, one of the most prominent features of the residual gravity field, corresponds with domains of low topography, i.e., internally- drained basins, which are surrounded by zones of Neogene faults and abundant felsic volcanic rocks. Dip curvature analysis of the isostatic residual gravity field shows that elongate zones of maximal curvature correlate with the strike of prominent Neogene faults. Our study suggests that such analysis constitutes an important tool for imaging upper-crustal structures, even those that are not readily apparent at surface. For example, upper-crustal faults in the Salar de Atacama area, the presence of which is suggested by the dip curvature of residual gravity, offers a plausible explanation for the pronounced angular departure of the volcanic belt from its overall meridional trend and its narrowing south of the salar. In contrast to previous interpretations, our study suggests that gravity anomalies of the Central Andes are largely controlled by the distribution of late Cenozoic volcanism and tectonism. Dip curvature analysis of gravity fields bear great potential for elucidating first-order structural elements of deformed, upper-crustal terrains such as the modern Andes.

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Authors and Affiliations

  1. Museum für Naturkunde, Humboldt-Universität Berlin, Invalidenstrasse 43, 10115, Berlin, Germany

    Ulrich Riller

  2. Abteilung Geophysik, Institut für Geowissenschaften, Christian-Albrechts-Universität Kiel, Otto-Hahn-Platz 1, 24118, Kiel, Germany

    Hans-Jürgen Götze & Sabine Schmidt

  3. Department 4 Chemie der Erde, GeoForschungsZentrum Potsdam, Telegrafenberg, 14473, Potsdam, Germany

    Robert B. Trumbull

  4. Instituto de Bio y Geociencias, Universidad Nacional de Salta, Buenos Aires 177, 4400, Salta, Argentina

    Fernando Hongn

  5. IBIGEO-CONICET and Universidad Nacional de Salta, Mendoza N° 2, 4400, Salta, Argentina

    Ivan Alejandro Petrinovic

Authors
  1. Ulrich Riller
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  2. Hans-Jürgen Götze
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  3. Sabine Schmidt
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  4. Robert B. Trumbull
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  5. Fernando Hongn
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  6. Ivan Alejandro Petrinovic
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Editor information

Editors and Affiliations

  1. Department 3 Geodynamik, GeoForschungsZentrum Potsdam, Telegrafenberg, 14473, Potsdam, Germany

    Onno Oncken

  2. Departamento de Geología, Universidad Católica del Norte, Avenida Angamos 610, Antofagasta, Chile

    Guillermo Chong

  3. Petrologie, Institut für Angewandte Geowissenschaften, Technische Universität Berlin, Ernst-Reuter-Platz 1, 10587, Berlin, Germany

    Gerhard Franz

  4. Abteilung Geophysik, Institut für Geowissenschaften, Christian-Albrechts-Universität Kiel, Otto-Hahn-Platz 1, 24118, Kiel, Germany

    Hans-Jürgen Götze

  5. Departamento Ciencias Geológicas, Universidad de Buenos Aires, Ciudad Universitaria, 1428, Buenos Aires, Argentina

    Victor A. Ramos

  6. Institut für Geowissenschaften, Universität Potsdam, Karl-Liebknecht-Strasse 24, 14476, Potsdam, Germany

    Manfred R. Strecker

  7. Fachrichtung Geophysik, Institut für Geologische Wissenschaften, Freie Universität Berlin, Malteserstrasse 74-100, 12249, Berlin, Germany

    Peter Wigger

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Riller, U., Götze, HJ., Schmidt, S., Trumbull, R.B., Hongn, F., Petrinovic, I.A. (2006). Upper-Crustal Structure of the Central Andes Inferred from Dip Curvature Analysis of Isostatic Residual Gravity. In: Oncken, O., et al. The Andes. Frontiers in Earth Sciences. Springer, Berlin, Heidelberg . https://doi.org/10.1007/978-3-540-48684-8_15

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