By Hans -Jürgen Götze, Bernd Lahmeyer, Sabine Schmidt, Sibyll Strunk (auth.), Professor Dr. Klaus-Joachim Reutter, Dr. Ekkehard Scheuber, Dr. Peter J. Wigger (eds.)
together with contributions via invited geoscientists The principal Andes, whose orogenic job is so impressively documented through fresh volcanism and and opposite numbers from different nations, in the course of a workshop held in Berlin, 23-25 may possibly 1990. a very good earthquakes, have consistently attracted the eye of geoscientists. This curiosity turned much more accen variety of the papers offered at this workshop are tuated for the reason that, 1 / 4 of a century in the past, Plate integrated during this quantity. whereas many of the chapters Tectonics grew to become the root for the recent worldwide refer locally to the phase of the southern Andes Tectonics thought, within which this massive mountain variety pointed out above, others deal with normal features or deal used to be the main staggering instance of an lively conti with Andean areas farther south, therefore exhibiting not just that the constructions of this mountain diversity should be nental margin. therefore, as well as the continued examine paintings through South American and overseas geo to extra far away elements but additionally that there are scientists committed in most cases to nearby and monetary major structural adaptations alongside strike. difficulties, a large number of unique examine seasoned Like different books which originate from workshops grammes have been initiated aiming at a greater comprehend and are created from contributions from many ing of the methods performing at a convergent plate authors, additionally this one can't supply a whole and margin. well-balanced view of the clinical topic dealt In 1982, the earth technological know-how institutes of the Freie with, to that end the southern critical Andes.
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Additional info for Tectonics of the Southern Central Andes: Structure and Evolution of an Active Continental Margin
The dotted lines refer to the corresponding 1D model calculations (Fig. 16) Narvaez - P. Blancos - east vp (km/s) 03 4 5 6 7 o3 4 5 wes t Vp (km/s) 67 ~'--"~----'---~-'--"'------' -5 ~ E -'" - 15 -15 Fig. 16. Velocity-depth functions derived from the Narvaez-east (SP 37) and the reversed Palos Blancos-west (SP 39) record section in the Subandean Ranges. The upper parts of the functions down to 4 kIn represent steeply dipping sediments of the fold and thrust belt, the 4-10 kIn range shows older sediments in a more horizontal position; typical basement velocities are reached at 10 kIn depth Vill am ont.
1 ~. , '" " :;;;- 240. 220. 200. 0 ...... F ~! 180. 0 : 260. z :"T 160. 140 . 120. 100. DISTANCE [KMJ 80. 60. 40. 20. o. _ -- - - - Fig. 14b. Record section Villamontes-west (SP 36, BP: 2-12 Hz). The eastern part of the prome shows a simple crustal structure already representing shield conditions lower crustal complexes outcropping in the Coastal Cordillera. The geological situation of the modem continental margin and the main seismic results are represented in Fig.
Pre-C. Western C. - -- Interpreted as: ...... -1 py '000 m sI Tarija • ...... /. - 100 km - SP Vil/a_ antes Subandean Ranges Chaco 65' _. ". ~ ... ".. 1:•••••. ~................. Observed: --Proven seismic boundary c::::J Low velocity zone ~ Recent lower crust of the forearc: alternating low and high velocities ~ Oceanic crust Co st Coastal C. --- . Topograph Fig. 20. The interpretative cross section at 21 °15'S bases on the main seismic discontinuities and low velocity zones found in the presented data (see Fig.