Tectonics of the Southern Central Andes: Structure and Evolution of an Active Continental Margin

ISBN-13: 9783642773556 / Angielski / Miękka / 2011 / 334 str.

Klaus-Joachim Reutter; Ekkehard Scheuber; Peter J. Wigger

Opis

together with contributions by invited geoscientists The Central Andes, whose orogenic activity is so impressively documented by recent volcanism and and counterparts from other countries, during a workshop held in Berlin, 23-25 May 1990. A great earthquakes, have always attracted the attention of geoscientists. This interest became even more accen- number of the papers presented at this workshop are tuated since, a quarter of a century ago, Plate included in this volume. While most of the chapters Tectonics became the basis for the New Global refer regionally to the segment of the southern Andes Tectonics concept, in which this huge mountain range mentioned above, others treat general aspects or deal was the most spectacular example of an active conti- with Andean regions farther south, thus showing not only that the structures of this mountain range can be nental margin. Thus, in addition to the continuing research work by South American and foreign geo- followed to more distant parts but also that there are scientists dedicated mostly to regional and economic significant structural variations along strike. problems, a great number of special research pro- Like other books which originate from workshops grammes were initiated aiming at a better understand- and are comprised of contributions from many ing of the processes acting at a convergent plate authors, also this one cannot give a complete and margin. well-balanced view of the scientific subject dealt In 1982, the earth science institutes of the Freie with, in this case the southern Central Andes.

Spis treści

Structure and State of the Lithosphere.- The Lithospheric Structure of the Central Andes (20° – 26°S) as Inferred from Interpretation of Regional Gravity.- Variation in the Crustal Structure of the Southern Central Andes Deduced from Seismic Refraction Investigations.- Crustal High Conductivity Zones in the Southern Central Andes.- Geothermal Structure of the Central Andean Crust — Implications for Heat Transport and Rheology.- Large- and Fine-Scale Geochemical Variations Along the Andean Arc of Northern Chile (17.5°–22°S).- Partial Melting in the Lower Crust: New Constraints on Crustal Contamination Processes in the Central Andes.- State of In Situ Stress in Northern Chile and in Northwestern Argentina.- Large Events, Seismic Gaps, and Stress Diffusion in Central Chile.- Geological Evolution.- Tectonic Development of the North Chilean Andes in Relation to Plate Convergence and Magmatism Since the Jurassic.- K-Ar and Fission Track Mineral Age Determinations of Igneous Rocks Related to Multiple Magmatic Arc Systems Along the 23°S Latitude of Chile and NW Argentina.- Geothermal and Tectonic Evolution of the Eastern Cordillera and the Subandean Ranges of Southern Bolivia.- Sedimentary and Structural Evolution of the Salar de Atacama Depression.- The Purilactis Group of Northern Chile: Boundary Between Arc and Backarc from Late Cretaceous to Eocene.- Early Jurassic to Early Cretaceous Magmatism in the Coastal Cordillera and the Central Depression of North Chile.- Sediment Accumulation and Subsidence History in the Mesozoic Marginal Basin of Northern Chile.- Jurassic Cretaceous Palaeogeographic Evolution of the Chilean Andes at 23°–24°S Latitude and 34°–35°S Latitude: A Comparative Analysis.- The Southern Andes Between 39° and 44°S Latitude: The Geological Signature of a Transpressive Tectonic Regime Related to a Magmatic Arc.- Terranes of Southern Gondwanaland and Their Control in the Andean Structure (30°–33°S Latitude).- Some Isotopic and Geochemical Constraints on the Origin and Evolution of the Central Andean Basement (19°–24°S).- The Late Carboniferous to Triassic Volcanic Belt in Northern Chile.- Geodynamic Evolution of the Early Palaeozoic Continental Margin of Gondwana in the Southern Central Andes of Northwestern Argentina and Northern Chile.- The Nitrate Deposits of Chile.- Petrochemical Factors Governing the Metallogeny of the Bolivian Tin Belt.- Maps of the Central Andean Segment Between 20° and 26°S.- Comments on the Geological and Geophysical Maps.- Enclosure.- 1 Geological Map.- 2 Bouguer Anomaly and Epicenters.- 3 Residual Gravity Anomaly (each at the scale 1:1 000 000 covering the area 20°–26° latitude and 63°–71° 30’W longitude).