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By J. Frutos (auth.), Prof. Dr. Lluís Fontboté, Prof. Dr. G. Christian Amstutz, Prof. Dr. Miguel Cardozo, Prof. Dr. Esteban Cedillo, Prof. Dr. José Frutos (eds.)

ISBN-10: 364288282X

ISBN-13: 9783642882821

ISBN-10: 3642882846

ISBN-13: 9783642882845

The current quantity Stratabound Ore Deposits within the Andes has its roots in a world seminar on stratabound ore deposits which happened in September 1986 in Cusco, Peru, backed by means of Multi­ ciencias (Peru) and UNESCO. in this seminar it grew to become transparent that the volume and caliber of analysis performed on stratabound ore deposits within the Andes required a synthesis. Researchers in and executive in addition to in academia, together with many which had participated on the Cusco Seminar, have been invited to give a contribution. the reply used to be tremendous confident, confirming the concept a ebook expressing the cutting-edge of the research of stratabound ore deposits within the Andes used to be lengthy past due. As editors we sought to offer greatest insurance to the current wisdom, but preserving the size, and thereby the cost, inside of rea­ sonable limits. The booklet includes 3 varieties of contributions. within the first half the reader will locate evaluation papers concentrating on ( 1) the geologic framework (Frutos), (2) the metallogenesis in Andean nations together with additionally different types of deposits differing from these of stratabound nature (Cardozo and Cedillo, Oyarzun), and (3) an in­ troductory review of the stratabound ore deposits within the Andes, emphasizing their geotectonic place as a category software (Font­ bote).

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A new tectonic interpretation of the Early Paleozoic events has been recently suggested by Ramos et al. (1984), who proposed the collision of a continental mass, "Chilenia", with the Gondwanic Craton. Herve et al. (1987) point out that the relationships between the Arequipa microplate and the hypothetical Chilenia are unknown, a possibility being that they could be parts of the same continental plate accreted in different periods, or two completely independent elements. 18 J. Frutos The Paleozoic tectonic cycle ended during the Upper Permian-lower Triassic with a great emersion and subsequent peneplanization episode characterized by widely exposed continental-clastic, red bed sequences including an important rhyolitic-keratophyric plateau-type volcanism.

At the Central Andes subduction zone) present neat, deep, and well-developed Benioff zones. It is interesting to point out, as a corollary of the relationship between convergence rates and the Benioff zone sinuosity mechanism, the notable absence of recent volcanism and longitudinal graben valleys coinciding with a curved-flat ("trowel" form: first steeply dipping and then horizontal) Benioff zone at 29°-35°S lat. of the Norte Chico segment of the Chilean Andes (Fig. 4). Frutos and Tobar (1975) and Frutos (1988) described the rotation of the orogenic tectonic-structural axes in the evolution of the southwestern continental margin of South America, from the WNW directions of the Upper ProterozoicLower Paleozoic, through the NW directions of the Middle-Upper Paleozoic, the NW-NNW directions of the Jurassic-Lower Cretaceous, the NS directions of the Upper Cretaceous-Lower Tertiary, to the NE direction in the Miocene events.

The central part, by contrast, is composed of green schists partly glaucophanized, including amphibolites. 2 The Meridional Andes Mesozoic-Cenozoic System The development of the Mesozoic-Cenozoic Meridional Andes is characterized in the same form as the Central Andes by a volcanic arc-back-arc basin evolving system that appears as a consequence of a permanent east-northeasterly dipping oceanic plate subduction beneath a sialic crust (Frutos and Tobar 1975). The Andes Cordillera: A Synthesis of the Geologic Evolution 25 However, in comparison with the Central Andes, important differences characterize the southern Andes evolution.

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Stratabound Ore Deposits in the Andes by J. Frutos (auth.), Prof. Dr. Lluís Fontboté, Prof. Dr. G. Christian Amstutz, Prof. Dr. Miguel Cardozo, Prof. Dr. Esteban Cedillo, Prof. Dr. José Frutos (eds.)


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